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  • 1.
    Abiri, Olufunminiyi
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Non-local damage models in manufacturing simulations2013Conference paper (Refereed)
    Abstract [en]

    Localisation of deformation is a problem in several manufacturing processes. Machining is an exception where it is a wanted feature. However, it is always a problem in finite element modelling of these processes due to mesh sensitivity of the computed results. The remedy is to incorporate a length scale into the numerical formulations in order to achieve convergent solutions. Different simplifications in the implementation of a non-local damage model are evaluated with respect to temporal and spatial discretisation to show the effect of different approximations on accuracy and convergence.

  • 2.
    Abiri, Olufunminiyi
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Non-local damage models in manufacturing simulations2015In: European journal of mechanics. A, Solids, ISSN 0997-7538, E-ISSN 1873-7285, Vol. 49, p. 548-560Article in journal (Refereed)
    Abstract [en]

    Localisation of deformation is a problem in several manufacturing processes. Machining is an exception where it is a wanted feature. However, it is always a problem in finite element modelling of these processes due to mesh sensitivity of the computed results. The remedy is to incorporate a length scale into the numerical formulations in order to achieve convergent solutions. Different simplifications in the implementation of a non-local damage model are evaluated with respect to temporal and spatial discretisation to show the effect of different approximations on accuracy and convergence.

  • 3.
    Abiri, Olufunminiyi
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Qin, Hao
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Comparison of Multiresolution Continuum Theory and Nonlocal Dame model for use in Simulation of Manufacutring Processes2016In: International Journal for Multiscale Computational Engineering, ISSN 1543-1649, Vol. 14, no 1, p. 81-94Article in journal (Refereed)
    Abstract [en]

    Modelling and simulation of manufacturing processes may require the capability to account for localization behavior, often associated with damage/fracture. It may be unwanted localization indicating a failure in the process or, as in the case of machining and cutting, a wanted phenomenon to be controlled. The latter requires a higher accuracy regarding the modelling of the underlying physics, as well as the robustness of the simulation procedure. Two different approaches for achieving mesh-independent solutions are compared in this paper. They are the multiresolution continuum theory (MRCT) and nonlocal damage model. The MRCT theory is a general multilength-scale finite element formulation, while the nonlocal damage model is a specialized method using a weighted averaging of softening internal variables over a spatial neighborhood of the material point. Both approaches result in a converged finite element solution of the localization problem upon mesh refinement. This study compares the accuracy and robustness of their numerical schemes in implicit finite element codes for the plane strain shear deformation test case. Final remarks concerning ease of implementation of the methods in commercial finite element packages are also given.

  • 4.
    Abiri, Olufunminiyi
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials. University of Johannesburg, South Africa.
    Svoboda, Ales
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Wedberg, Dan
    Controlling Thermal Softening Using Non-Local Temperature Field in Modelling2016In: Journal of Machining and Forming Technologies, ISSN 1947-4369, Vol. 8, no 1-2, p. 13-28Article in journal (Refereed)
    Abstract [en]

    One of the aims of this work is to show that thermal softening due to the reduced flow strength of a material with increasing temperature may cause chip serrations to form during machining. The other purpose, the main focus of the paper, is to demonstrate that a non-local temperature field can be used to control these serrations. The non-local temperature is a weighted average of the temperature field in the region surrounding an integration point. Its size is determined by a length scale. This length scale may be based on the physics of the process but is taken here as a regularization parameter.

  • 5.
    Abiri, Olufunminiyi
    et al.
    Institute of Intelligent Systems, University of Johannesburg.
    Wedberg, Dan
    AB Sandvik Coromant.
    Svoboda, Ales
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Non-Local Modelling of Strain Softening in Machining Simulations2017In: IOP Conference Series: Materials Science and Engineering, ISSN 1757-8981, E-ISSN 1757-899X, Vol. 225, article id 012053Article in journal (Refereed)
    Abstract [en]

    Non-local damage model for strain softening in a machining simulation is presented in this paper. The coupled damage-plasticity model consists of a physically based dislocation density model and a damage model driven by plastic straining in combination with the stress state. The predicted chip serration is highly consistent with the measurement results. 

  • 6.
    Azizoğlu, Yağız
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Gärdsback, Mattias
    Sandvik Materials Technology, R&D, Sandviken.
    Sjöberg, Bengt
    Sandvik Materials Technology, R&D, Sandviken.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Finite Element Analysis of cold pilgering using elastic roll dies2017In: Procedia Engineering, ISSN 1877-7058, E-ISSN 1877-7058, Vol. 207, p. 2370-2375Article in journal (Refereed)
    Abstract [en]

    A finite element model of cold pilgering with elastic roll dies have been developed and used to investigate the influence of roll die deformation on the material flow, contact region, roll separating force and tube dimensions. Full scale experiments were performed to validate the contact surface and tube dimensions. The results show that the influence of roll die flattening is not significant on the contact length. However, elastic deformation of roll die has strong influence on both the wall thickness reduction and roll separating force. Thus it is recommended to consider elasticity of roll dies when forces and tube dimensions are estimated.

  • 7.
    Azizoğlu, Yağız
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Gärdsback, Mattias
    Sandvik Mat Technol, R&D, SE-81181 Sandviken.
    Sjöberg, Bengt
    Sandvik Mat Technol, R&D, SE-81181 Sandviken.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Finite element modeling of tube deformation during cold pilgering2016In: NUMIFORM 2016: The 12th International Conference on Numerical Methods in Industrial Forming Processes / [ed] Saanouni, K; Chenot, JL; Duval, JL, 2016, Vol. 80, p. 1-8, article id 15004Conference paper (Refereed)
    Abstract [en]

    A three-dimensional finite element model of cold pilgering of stainless steel tubes is developed in this paper. The objective is to use the model to increase the understanding of forces and deformations in the process. The focus is on the influence of vertical displacements of the roll stand and axial displacements of the mandrel and tube. Therefore, the rigid tools and the tube are supported with elastic springs. Additionally, the influences of friction coefficients in the tube/mandrel and tube/roll interfaces are examined. A sensitivity study is performed to investigate the influences of these parameters on the strain path and the roll separation force. The results show the importance of accounting for the displacements of the tube and rigid tools on the roll separation force and the accumulative plastic strain.

  • 8.
    Azizoğlu, Yağız
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Gärdsback, Mattias
    Dalarna University.
    Sjöberg, Bengt
    Dalarna University.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Finite Element Modelling of Cold Pilgering of Tubes2015In: Computational Plasticity XIII: Fundamentals and Applications - Proceedings of the 13th International Conference on Computational Plasticity - Fundamentals and Applications,held in Barcelona, Spain, 1-3 September 2015 / [ed] E. Oñate; D.R.J. Owen; D. Peric; M. Chiumenti, Barcelona: International Center for Numerical Methods in Engineering (CIMNE), 2015, p. 716-726Conference paper (Refereed)
    Abstract [en]

    Cold pilgering is a cold forming process used during manufacturing of seamless tubes. The tube with a mandrel inside is fed forward and rotated in stepwise increments, while the roll stand moves back and forth. The total plastic deformation of the tube is such that the cross-sectional area of the tube decreases and the length of the tube increases during the process. However, this is performed in many small incremental steps, where the direction of deformation in a material point changes at each stroke. Most published models of cold pilgering use simplified material models. In reality, the flow stress is dependent on temperature, strain rate, strain history and microstructure. In this work, temperature and strain rate distributions are computed, using a 3D thermo-mechanical FE model, and the influence of temperature and strain rate on the rolling force is investigated. The Johnson-Cook model is employed to describe the flow stress using isotropic hardening. The results show that strain rate and temperature have a significant influence on the roll separation force

  • 9.
    Babu, Bijish
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Charles, Corinne
    Department of Industrial Production, Högskolan Väst, Trollhättan.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Physically Based Constitutive Model of Ti-6Al-4V for Arbitrary Phase Composition2018In: International journal of plasticity, ISSN 0749-6419, E-ISSN 1879-2154Article in journal (Refereed)
    Abstract [en]

    The principal challenge in producing aerospace components using Ti-6Al-4V alloy is to employ the optimum process window of deformation rate and temperature to achieve desired material properties. Qualitatively understanding the microstructure-property relationship is not enough to accomplish this goal. Developing advanced material models to be used in manufacturing process simulation is the key to compute and optimize the process iteratively. The focus in this work is on physically based flow stress models coupled with microstructure evolution models. Such a model can be used to simulate processes involving complex and cyclic thermo-mechanical loading.

  • 10.
    Babu, Bijish
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Dislocation density based model for plastic deformation and globularization of Ti-6Al-4V2013In: International journal of plasticity, ISSN 0749-6419, E-ISSN 1879-2154, Vol. 50, p. 94-108Article in journal (Refereed)
    Abstract [en]

    Although Ti-6Al-4V has numerous salient properties, its usage for certain applications is limited due to the challenges faced during manufacturing. Understanding the dominant deformation mechanisms and numerically modeling the process is the key to overcoming this hurdle. This paper investigates plastic deformation of the alloy at strain rates from 0.001s−1 to 1s−1 and temperatures between 20° C and 1100° C. Pertinent deformation mechanisms of the material when subjected to thermo-mechanical processing are discussed. A physically founded constitutive model based on the evolution of immobile dislocation density and excess vacancy concentration is developed. Parameters of the model are obtained by calibration using isothermal compression tests. This model is capable of describing plastic flow of the alloy in a wide range of temperature and strain rates by including the dominant deformation mechanisms like dislocation pile-up, dislocation glide, thermally activated dislocation climb, globularization, etc. The phenomena of flow softening and stress relaxation, crucial for the simulation of hot forming and heat treatment of Ti-6Al-4V, can also be accurately reproduced using this model.

  • 11.
    Babu, Bijish
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials. Swerea MEFOS.
    Lundbäck, Andreas
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Simulation of additive manufacturing of Ti-6Al-4V using a coupled physics-based flow stress and microstructure modelManuscript (preprint) (Other academic)
    Abstract [en]

    Simulating the additive manufacturing process of Ti-6Al-4V is very complex owing to the microstructural changes and allotropic transformation occurring during its thermo-mechanical processing. The alpha-phase with a hexagonal close pack structure is present in three different forms; Widmanstatten, grain boundary, and Martensite. A metallurgical model that computes the formation and dissolution of each of these phases is used in this work. Furthermore, a physically based flow-stress model coupled with the metallurgical model is applied in the simulation of direct energy deposition additive manufacturing case.

  • 12.
    Babu, Bijish
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Svoboda, Ales
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Ghassemali, Ehsan
    School of Engineering, Jönköping University..
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Dislocation density based plasticity model extended to high strain rate deformation of Ti-6Al-4VManuscript (preprint) (Other academic)
    Abstract [en]

    One of the main challenges in the simulation of machining is accurately describing the material behavior during severe plastic deformation at strain rates ranging six orders of magnitude and temperature between room temperature to nearly melting temperature. High strain rate measurements are performed using Split-Hopkinson Pressure Bar (SHPB) technique at a range of temperatures. The temperature change during deformation is included by computing the plastic work converted to heat energy. A physics-based material model published earlier (Babu and Lindgren, 2013) is extended in this paper to include the high strain rate mechanisms of phonon and electron drag. Characterization of the microstructure is performed using Electron Backscatter Diffraction (EBSD), and a novel method is proposed in this work to quantify the extent of globularization which is compared with model predictions.

  • 13. Berglund, Daniel
    et al.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Lundbäck, Andreas
    Three-dimensional finite element simulation of laser welded stainless steel plate2001In: Simulation of materials processing: theory, methods and applications : proceedings of the 7th International conference on numerical methods in industrial forming processes - NUMIFORM 2001 / [ed] Ken-ichiro Mori, Lisse: Balkema Publishers, A.A. / Taylor & Francis The Netherlands , 2001, p. 1119-1124Conference paper (Refereed)
  • 14.
    Börjesson, Lars
    et al.
    Luleå tekniska universitet.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Residual stresses and microstructure computation for multipass [multirun] welding1997In: The Fifth International Conference on Residual Stresses - ICRS-5 / [ed] Torsten Ericsson; Magnus Odén; Aneth Andersson, Linköping: Linköping University Electronic Press, 1997, Vol. 1, p. 189-194Conference paper (Refereed)
    Abstract [en]

    Residual stress studies (by centre-hole drilling and finite element analysis) and microstructural computations (using temperature measurements) were carried out on multirun butt welded steel plates. The plates, 200 mm thickness, were in SIS 2134 material (0.12%C, 1.42%Mn, 0.044%V, 0.014%Ti, 0.038%Al). Welding was by submerged arc welding using ESAB OK AUTROD 12.10 filler material and ESAB OK FLUX 10.80 flux

  • 15.
    Börjesson, Lars
    et al.
    Luleå tekniska universitet.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Simulation of multipass welding using mixture rules for prediction of material properties1998In: Simulation of materials processing : theory, methods and applications: international conference on numerical methods in industrial forming processes, NUMIFORM '98 / [ed] J. Huétink; F.P.T Baaijens, Rotterdam: Balkema Publishers, A.A. / Taylor & Francis The Netherlands , 1998, p. 351-357Conference paper (Refereed)
    Abstract [en]

    Multipass butt welding of two 0.2 m thick steel plates has been investigated. The purpose of the project is to evaluate the residual stresses by experiment and simulations. Temperature dependent material properties were assumed in previous studies. We account for the dependency on temperature history in this work. This has been done by computing the microstructure evolution. This is combined with mixture rules for computing material properties.

  • 16.
    Börjesson, Lars
    et al.
    Luleå tekniska universitet.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Simulation of multipass welding with simultaneous computation of material properties2001In: Journal of engineering materials and technology, ISSN 0094-4289, E-ISSN 1528-8889, Vol. 123, no 1, p. 106-111Article in journal (Refereed)
    Abstract [en]

    Multipass butt welding of two 0.2 m thick steel plates has been investigated. The objective is to calculate residual stresses and compare them with measured residual stresses. The material properties depend on temperature and temperature history. This dependency is accounted for by computing the microstructure evolution and using this information for computing material properties. This is done by assigning temperature dependent material properties to each phase and applying mixture rules to predict macro material properties. Two different materials have been used for the microstructure calculation, one for the base material and one for the filler material

  • 17.
    Domkin, K.
    et al.
    Luleå tekniska universitet.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Dislocation model for plastic hardening in sheet metal forming2001In: Simulation of Materials Processing: Theory, Methods and Applications: proceedings of the 7th International Conference on Numerical Methods in Industrial Forming Processes - NUMIFORM 2001, Toyohashi, Japan, 18 - 20 June 2001 / [ed] Ken-ichiro Mori, Lisse: Balkema Publishers, A.A. / Taylor & Francis The Netherlands , 2001Conference paper (Refereed)
  • 18.
    Domkin, Konstantin
    et al.
    Luleå tekniska universitet.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Segle, Peter
    Luleå tekniska universitet.
    Dislocation density based models for plastic hardening and parameter identification2003In: Computational plasticity VII: fundamentals and applications ; proceedings of the Seventh Conference on Computational plasticity / [ed] D.R.J. Owen, International Center for Numerical Methods in Engineering (CIMNE), 2003Conference paper (Refereed)
    Abstract [en]

    In this paper the parameter identification using dislocation density based material model is studied. The model is rate-dependent and includes isotropic strainhardening/ softening as well as kinematic hardening. The model is implemented as a part of the custom toolbox for parameter identification (described in the accompanying paper) using Matlab®. A general stress-strain algorithm is used in the calculations, so the same logic can also be used when implementing the material models into a finite element code. The stressupdate algorithm of rate-dependent plasticity is chosen in the form that has the yield surface for which a so-called consistency condition exists. The amount of plasticity in a strain increment is determined by the consistency condition, whereas the internal variables history and yield stress depend on the plastic strain-rate. The paper focuses on the use of physically based material models. The dislocation density concept links the macroscopic stresses and strains to the underlying micro-structural processes of plastic deformation. The material models define evolution equations for the densities of mobile, immobile locked and immobile recoverable dislocations. The physical significance of the model parameters is highlighted. The developed toolbox is used to determine material parameters of a high-strength steel for a chosen dislocation density model fitted to the constant amplitude fully reversed strain controlled cyclic test curves. Parameter sensitivity is briefly discussed.

  • 19. Domkin, Konstantin
    et al.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Troive, Lars
    Physically based material model in sheet metal forming2001In: Simulation of materials processing: theory, methods and applications : proceedings of the 7th International conference on numerical methods in industrial forming processes - NUMIFORM 2001 / [ed] Ken-ichiro Mori, Lisse: Balkema Publishers, A.A. / Taylor & Francis The Netherlands , 2001, p. 221-226Conference paper (Refereed)
  • 20.
    Edberg, Jonas
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Larsson, Dan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Simulation of braking of railway wheel2003Report (Other academic)
    Abstract [en]

    LKAB has tried new iron ore wagons for the 30 tonnes axle load. They got problems with cracking and material removal from the rim of the wheels during the tests. Martensite, which is more prone to cracking than other microstructures, was found at these locations. The initial material microstructure is supposed to contain no martensite. The purpose of this investigation is to find whether the thermal cycle due to braking, possibly with assistance of the mechanical load, can cause martensite formation

  • 21.
    Edberg, Jonas
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Efficient three-dimensional model of rolling using an explicit finite-element formulation1993In: Communications in Numerical Methods in Engineering, ISSN 1069-8299, E-ISSN 1099-0887, Vol. 9, no 7, p. 613-627Article in journal (Refereed)
    Abstract [en]

    Rolling is simulated by a three-dimensional finite-element model with elastoplastic constitutive equations. The use of an explicit finite-element formulation, instead of the more commonly used implicit formulation, has reduced the required computing time. The larger of the models used in one step towards a general and complete computational model of rolling. Results from experiments and from two and three-dimensional calculations are compared.

  • 22.
    Edberg, Jonas
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Wedge rolling test1994In: Journal of Materials Processing Technology, ISSN 0924-0136, E-ISSN 1873-4774, Vol. 42, no 2, p. 227-238Article in journal (Refereed)
    Abstract [en]

    A method for the evaluation of friction models is described. A wedge is rolled to uniform thickness, a range of reductions being investigated thereby in one experiment. Finite-element simulations are performed in order to estimate the friction parameters that can be used in the simulation of hot rolling. The influence of the material parameters and the friction parameters on the calculated results are investigated and the latter are compared with experimental results. It is shown that it is possible to separate the influence of the material parameters and the friction parameters, thus enabling the friction parameters to be evaluated from a minimum number of experiments.

  • 23.
    Edberg, Jonas
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Ken-Ichiro, M.
    Shot peening simulated by two different finite element formulations1995In: Simulation of materials processing: theory, methods and applications ; proceedings of the Fifth International Conference on Numerical Methods in Industrial Forming Processes - NUMIFORM'95, Ithaca, New York, USA, 18-21 June 1995 / [ed] Shan-Fu Shen; Paul Dawson, Rotterdam: Balkema Publishers, A.A. / Taylor & Francis The Netherlands , 1995Conference paper (Refereed)
  • 24.
    Fisk, Martin
    et al.
    Materials Science and Applied Mathematics, Faculty of Technology and Society, Malmö University.
    Ion, John
    Division of Materials Science, Malmö University.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Flow stress model for IN718 accounting for evolution of strengthening precipitates during thermal treatment2014In: Computational materials science, ISSN 0927-0256, E-ISSN 1879-0801, Vol. 82, p. 531-539Article in journal (Refereed)
    Abstract [en]

    A flow stress model describing precipitate hardening in the nickel based alloy Inconel® 718 following thermal treatment is presented. The interactions between precipitates and dislocations are included in a dislocation density based material model. Compression tests have been performed using solution annealed, fully-aged and half-aged material. Models were calibrated using data for solution annealed and fully-aged material, and validated using data from half-aged material. Agreement between experimental data and model predictions is good.

  • 25.
    Fisk, Martin
    et al.
    Materials Science and Applied Mathematics, Malmö University.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Datchary, W.
    AB SKF.
    Deshmukh, V.
    AB SKF.
    Modelling of induction hardening in low alloy steels2018In: Finite elements in analysis and design (Print), ISSN 0168-874X, E-ISSN 1872-6925, Vol. 144, p. 61-75Article in journal (Refereed)
    Abstract [en]

    Induction hardening is a useful method for improving resistance to surface indentation, fatigue and wear that is favoured in comparison with through hardening, which may lack necessary toughness. The process itself involves fast heating by induction with subsequent quenching, creating a martensitic layer at the surface of the workpiece. In the present work, we demonstrate how to simulate the process of induction hardening using a commercial finite element software package with focuses on validation of the electromagnetic and thermal parts, together with evolution of the microstructure. Experiments have been carried out using fifteen workpieces that have been heated using three different heating rates and five different peak temperatures resulting in different microstructures. It is found that the microstructure and hardening depth is affected by the heating rate and peak temperature. The agreement between the experimental and simulated results is good. Also, it is demonstrated that the critical equilibrium temperatures for phase transformation is important for good agreement between the simulated and experimental hardening depth. The developed simulation technique predicts the hardness and microstructure sufficiently well for design and the development of induction hardening processes.

  • 26.
    Fisk, Martin
    et al.
    Materials Science and Applied Mathematics, Faculty of Technology and Society, Malmö University, Malmö University, Materials Science, Technology and Society, Malmö Högskola.
    Lundbäck, Andreas
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Andersson, Joel
    GKN Aerospace Engine Systems, Trollhättan.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Finite element analysis using a dislocation density based flow stress model coupled with model for precipitate evolution2014In: 8th International Symposium on Superalloy 718 and Derivatives / [ed] Eric Ott, John Wiley & Sons, 2014, p. 155-168Conference paper (Refereed)
    Abstract [en]

    Gas Tungsten Arc Welding is simulated using the finite element method. The material model that has been used is a physically based plasticity model, coupled with a model for nucleation, growth, and coarsening of second phase particles. The material model is well suited for thermo-mechanical simulations and is used to predict microstructural changes, residual stresses and stress relaxation after post weld heat treatment. The residual stress state after welding is compared, using two different material models. One were the evolution of the precipitates is included and one where it is not. It is shown that the welding direction has an impact on the precipitate size and its distribution and thereby the residual stress state.

  • 27. Fällström, Karl-Evert
    et al.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Molin, Nils-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
    Transient bending waves in anisotropic plates studied by hologram interferometry1989In: Experimental mechanics, ISSN 0014-4851, E-ISSN 1741-2765, Vol. 29, no 4, p. 409-413Article in journal (Refereed)
    Abstract [en]

    Propagating bending waves are studied in plates made of glass-fiber reinforced polyester. The waves are generated by the impact of a ballistic pendulum. Hologram interferometry, with a double pulsed ruby laser as light source, is used to record the out of plane motion of the waves. The interferograms have an elliptic-like symmetry for an orthotropic plate, while the wave pattern for a symmetric angle-ply reinforced plate has a symmetry about the axes of reinforcements. Experimental data are compared on one hand to analytical results obtained by assuming that the orthotropic plate can be described as if isotropic along the main axes, and on the other hand to numerical results from calculations using the finite-element method. The effective Young's modulus raised to power 1/4 is shown to be an important parameter for the description of the dispersive wave pattern. A defect in the plate alters the wave pattern in the interferograms significantly. This may have technical use.

  • 28.
    Gyhlesten Back, Jessica
    et al.
    Högskolan Dalarna, Industriell Teknik, Materialvetenskap.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Influence of prior deformation in austenite on the martensite formation in a low-alloyed carbon steel2017In: Article in journal (Refereed)
  • 29. Hedström, Peter
    et al.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Almer, J.
    Advanced Photon Source (APS), Argonne National Laboratory, Argonne.
    Lienert, U.
    Advanced Photon Source (APS), Argonne National Laboratory, Argonne.
    Bernier, J.
    Lawrence Livermore National Laboratory.
    Terner, Mark
    Odén, Magnus
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Load partitioning and strain-induced martensite formation during tensile loading of a metastable austenitic stainless steel2009In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 40, no 5, p. 1039-1048Article in journal (Refereed)
    Abstract [en]

    In-situ high-energy X-ray diffraction and material modeling are used to investigate the strain-rate dependence of the strain-induced martensitic transformation and the stress partitioning between austenite and α′ martensite in a metastable austenitic stainless steel during tensile loading. Moderate changes of the strain rate alter the strain-induced martensitic transformation, with a significantly lower α′ martensite fraction observed at fracture for a strain rate of 10-2 s-1, as compared to 10-3 s-1. This strain-rate sensitivity is attributed to the adiabatic heating of the samples and is found to be well predicted by the combination of an extended Olson-Cohen strain-induced martensite model and finite-element simulations for the evolving temperature distribution in the samples. In addition, the strain-rate sensitivity affects the deformation behavior of the steel. The α′ martensite transformation at high strains provides local strengthening and extends the time to neck formation. This reinforcement is witnessed by a load transfer from austenite to α′ martensite during loading.

  • 30. Hedström, Peter
    et al.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Odén, Magnus
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Stress state and strain rate dependence of the strain-induced martensitic transformation in a metastable austenitic stainless steel2007In: Fundamentals of Martensite and Bainite towards Future Steels with High Performance: Challenges for Strength, Toughness, and Ductility : The 1st International Symposium on Steel Science, Kyoto, May 16 - 19, 2007 / [ed] Tadashi Furuhara; Kaneaki Tsuzaki, Tokyo: The Iron and Steel Institute of Japan , 2007, p. 171-174Conference paper (Refereed)
    Abstract [en]

    The strain-induced martensitic transformation in a metastable austenitic stainless steel is investigated by high-energy x-ray diffraction and material modeling. Two different deformation modes are used (cold rolling and uniaxial tensile loading) and the effect on the strain-induced martensitic transformation behavior is investigated. Moreover, three different strain rates during the uniaxial tensile loading are evaluated. The results show a sigmoidal transformation behavior of the strain-induced martensite in respect to true strain, for tensile loading. The effect of different strain rates is also clearly seen and it alters both the amount of transformed martensite and the transformation behavior. The martensite transformation is drastically decreased already at moderate strain rates such as 10-2 s-1, due to adiabatic heating of the sample. The material model used gives an accurate prediction of the strain-induced martensitic transformation behavior during tensile loading. This is valuable for further implementation of the current material model in industrial forming mulations of real components.

  • 31.
    Hyun, Seokjeong
    et al.
    Luleå tekniska universitet.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Simulating a chain of manufacturing processes using a geometry-based finite element code with adaptive meshing2004In: Finite elements in analysis and design (Print), ISSN 0168-874X, E-ISSN 1872-6925, Vol. 40, no 5-6, p. 511-528Article in journal (Refereed)
    Abstract [en]

    Adaptive meshing is not only beneficial but also essential when simulating manufacturing processes. It can be used to reduce element distortions and to obtain accurate solutions in an efficient way. The versatility of combining different meshing capabilities when simulating a chain of manufacturing processes is demonstrated. The techniques have been implemented in a finite element code that is geometry oriented. This is convenient for the user and the additional complexity in the processing of the input file is compensated by the possibility to reuse this logic for transfer model definition data from old to new mesh

  • 32.
    Hyun, Seokjeong
    et al.
    Luleå tekniska universitet.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Smoothing and adaptive remeshing schemes for graded element2001In: Communications in Numerical Methods in Engineering, ISSN 1069-8299, E-ISSN 1099-0887, Vol. 17, no 1, p. 1-17Article in journal (Refereed)
    Abstract [en]

    Smoothing improves the mesh quality by repositioning nodes while h-adaptive remeshing changes the topology of the mesh. The combination of these two schemes is indispensable when dealing with models with distorted elements and/or moving gradients in the solution. Different smoothing techniques for creating a mesh of high quality are studied. The quality of the mesh is quantified by a distortion metric. The adaptive remeshing procedure uses a generic error estimate for determining the size of new elements. The combined techniques are implemented for a graded finite element.

  • 33. Jonsson, Mikael
    et al.
    Karlsson, Lennart
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Deformation and stresses in butt-welding of large plates1985In: Numerical methods in heat transfer: expanded and edited versions of selected papers from an international conference held in Swansea, July 1979 / [ed] R.W. Lewis; K. Morgan, John Wiley & Sons, 1985, Vol. 3, p. 35-57Conference paper (Refereed)
  • 34. Jonsson, Mikael
    et al.
    Karlsson, Lennart
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Deformations and stresses in butt-welding of large plates with special reference to the mechanical material properties1985In: Journal of engineering materials and technology, ISSN 0094-4289, E-ISSN 1528-8889, Vol. 107, no 4, p. 265-270Article in journal (Refereed)
    Abstract [en]

    Simulation of automatic butt-welding of large plates was investigated. Two different steels were considered. The plates were tack-welded before the butt-welding. The simulation includes the tack-welding, the butt-welding and the cooling to room temperature. The simulations should lead to an understanding of the mechanics behind the change in gap width in front of the moving arc, which is of importance in automatic welding production. The residual stresses due to the butt-welding were also studied. The magnitude and the distribution of the residual stress are important in design of welded structures.

  • 35. Jonsson, Mikael
    et al.
    Karlsson, Lennart
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Kan svetsegenspänningar och svetsdeformationer förutsägas?1986In: Svetsen, ISSN 0039-7091, Vol. 45, no 5, p. 6-9Article in journal (Other academic)
    Abstract [en]

    Many difficulties in welding result from the fact that heat input causes uneven heating of the welded object. This article reports on the results of an investigation carried out with the object to find out whether it is possible to predict residual stresses in welding and weld deformations with the aid of new computational methods used in continum mechanics. Butt welding of flat plates was studied in this investigation. Deformations, residual stresses, and gap width variations during the welding process were calculated.

  • 36. Jonsson, Mikael
    et al.
    Karlsson, Lennart
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Plate motion and thermal stresses in root-bead butt-welding and one-pass butt-welding of two different steels1984Conference paper (Other academic)
  • 37. Jonsson, Mikael
    et al.
    Karlsson, Lennart
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Plate motion and thermal stresses in root-bead butt-welding of plates1985In: Numerical methods in thermal problems: proceedings of the fourth international conference held in Swansea, UK on 15th - 18th July, 1985 / [ed] R.W. Lewis, Swansea: Pineridge Press , 1985, p. 1092-1102Conference paper (Refereed)
    Abstract [en]

    In this paper root-bead welding of plates of two different sizes was experimentally and theoretically analysed. The material of the plates was a fine-grain steel with yield limit 360 MPa. The finite element method was used for both the thermal analyses and the mechanical analyses. Temperature-dependent material properties and volume changes due to phase transformations were considered. Plane stress conditions were assumed. Good agreement between calculated and measured values were obtained.

  • 38. Jonsson, Mikael
    et al.
    Karlsson, Lennart
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Plate motion in butt-welding of tack-welded plates1984In: Numerical methods for transient and coupled problems: proceedings of an International Conference held in Venice, Italy on July 9th-13th, 1984 / [ed] R. W. Lewis; P. Bettess; E. Hinton; B.A. Schreffler, Swansea: Pineridge Press , 1984, p. 351-359Conference paper (Refereed)
  • 39. Jonsson, Mikael
    et al.
    Karlsson, Lennart
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Simulation of tack welding procedures in butt joint welding of plates1985In: Welding Journal, ISSN 0043-2296, Vol. 64, no 10, p. 296-301Article in journal (Refereed)
    Abstract [en]

    The influence of tack welding procedure on change in root opening was investigated. This change during the first part of welding depends on the order in which the tack welds are made. It is also affected by the starting position of the welding arc. These effects were studied in seven theoretical analyses - three cases where the tack welding procedures differed and four cases where the temperature fields at the beginning of the butt joint welding differed. The material investigated was a fine-grain steel with a yield stress of 360 MPa (52,200 psi) at room temperature. The filler material was ESAB 1. 2/12. 51 (AWS ER70S-6).

  • 40. Jonsson, Mikael
    et al.
    Karlsson, Lennart
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Thermal stresses and plate motion in butt-welding1983In: Numerical methods in thermal problems: proceedings of the third international conference, held in Seattle, USA, on 2nd - 5th August, 1983 / [ed] R.W. Lewis, Swansea: Pineridge Press , 1983, p. 270-279Conference paper (Refereed)
  • 41. Jonsson, Mikael
    et al.
    Karlsson, Lennart
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Thermal stresses, plate motion and hot-cracking in butt-welding1983In: Mechanical behaviour of materials - IV: proceedings of the fourth International conference, Stockholm, Sweden, 15-19 August 1983 / [ed] Janne Carlsson; Nils-Gunnar Ohlson, Oxford: Elsevier, 1983, p. 273-279Conference paper (Refereed)
  • 42. Jonsson, Mikael
    et al.
    Karlsson, Lennart
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Lindén, G.
    The influence of welding deformations on tolerance requirements in automatic butt welding1985Conference paper (Refereed)
  • 43. Josefson, B.L.
    et al.
    Jonsson, Mikael
    Karlsson, C.T.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Transformation plasticity effects on residual stresses in a butt welded pipe1990Conference paper (Refereed)
  • 44. Josefson, B.L.
    et al.
    Jonsson, Mikael
    Karlsson, Lennart
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Karlsson, R.
    Karlsson, T.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Transient and residual stresses in a single-pass butt welded pipe1989In: Residual stresses: International conference : Papers / [ed] G. Beck; S. Denis; A. Simon, Elsevier, 1989, p. 497-503Conference paper (Refereed)
  • 45. Josefson, B.L.
    et al.
    Karlsson, Lennart
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Jonsson, Mikael
    Thermo-mechanical FE-analysis of butt-welding of a Cu-Fe canister for spent nuclear fuel1993In: Structural mechanics in reactor technology: transactions of the 12th International Conference on Structural Mechanics in Reactor Technology, Stuttgart, Germany, 15-20 August 1993, Amsterdam: Elsevier, 1993Conference paper (Refereed)
  • 46. Josefsson, B.L.
    et al.
    Karlsson, Lennart
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Häggblad, Hans-åke
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Thermo-mechanical FE-analysis of the fabrication of a Cu-Fe canister for spent nuclear fuel1995In: Transactions of the 13th International Conference on Structural Mechanics in Reactor Technology : Porto Alegre, Brazil, August 13 - 18, 1995: [conference organization by:] International Association for Structural Mechanics in Reactor Technology e.V. (IASMiRT); Universidade Federal do Rio Grande do Sul (UFRGS). / [ed] R.C Ramos de Menezes, Porto Alegre: Ed. da Univ. , 1995Conference paper (Refereed)
  • 47. Kalhori, Vahid
    et al.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Edberg, Jonas
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Coupled thermomechanical simulation of hot rolling using an adaptive mesh1998In: Simulation of materials processing : theory, methods and applications: international conference on numerical methods in industrial forming processes, NUMIFORM '98 / [ed] J. Huétink; F.P.T. Baaijens, Rotterdam: Balkema Publishers, A.A. / Taylor & Francis The Netherlands , 1998, p. 689-693Conference paper (Refereed)
    Abstract [en]

    Coupled thermo-mechanical analysis of hot rolling is performed. The efficiency and accuracy when using an adaptive remeshing technique is compared with using a uniform, fine mesh. The advantages and limitations of the different techniques are discussed

  • 48.
    Kalhori, Vahid
    et al.
    AB Sandvik Coromant, Sandviken.
    Wedberg, Dan
    AB Sandvik Coromant, Sandviken.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Simulation of mechanical cutting using a physical based material model2010In: International Journal of Material Forming, ISSN 1960-6206, E-ISSN 1960-6214, Vol. 3, no Suppl. 1, p. 511-514Article in journal (Refereed)
    Abstract [en]

    A dislocation density material model based on model-based-phenomenology has been used to predict orthogonal cutting of stainless steel Sanmac 316L. The chip morphology and the cutting forces are used to validate the model. The simulated cutting forces and the chip morphology showed good conformity with practical measurements. Furthermore, simulation of cutting process utilizing the dislocation density based material model improved understanding regarding material behaviour such as strain hardening and shear localization at the process zone.

  • 49.
    Karlsson, Lennart
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Jonsson, Mikael
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Näsström, Mats
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Trovie, L.
    Residual stresses and deformations in a welded thin-walled pipe1989In: Weld residual stresses and plastic deformation: papers / [ed] E. Rybicki; M. Shiratori, New York: American Society of Mechanical Engineers , 1989Conference paper (Refereed)
    Abstract [en]

    Deformations and stresses during butt-welding of a pipe are calculated as well as the residual deformations and stresses. The temperature field during welding is calculated using an analytical solution. The deformations and stresses are calculated by use of the finite element method. A thermo-elastoplastic material model is used. Special attention is paid to the influence of the volume changes due to phase transformations on the deformations (radial shrinkage) and the residual stresses. The calculated radial shrinkage and residual stresses are compared to experimental values. Good agreement was obtained.

  • 50.
    Karlsson, Lennart
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
    Lindgren, Lars-Erik
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Combined heat and stress-strain calculations1990In: Modeling of Casting, Welding and Advanced Solidification Processes V: 5th International conference on modeling of casting and welding processes : Papers / [ed] Michel Rappaz, Warrendale, Pa: Minerals, Metals & Materials Society, 1990, p. 187-202Conference paper (Refereed)
1234 1 - 50 of 163
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