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  • 151.
    Sandberg, Stefan
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik.
    Lundin, Michael
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Produkt- och produktionsutveckling.
    Näsström, Mats
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Produkt- och produktionsutveckling.
    Lindgren, Lars-Erik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Berglund, Daniel
    Gestamp Hardtech AB, Luleå.
    Supporting engineering decisions through contextual, model-oriented communication and knowledge-based engineering in simulation driven product development: an automotive case study2013Inngår i: Journal of engineering design (Print), ISSN 0954-4828, E-ISSN 1466-1837, Vol. 24, nr 1, s. 45-63Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Modern manufacturers rely increasingly on overlapping activities and frequent, bilateral exchange of preliminary information, adding to the complexity of information exchange and general reuse. The approach presented in this paper relies on a reuse process, embedded in the design environment already used, to avoid disrupting the design process and to increase the foundation upon which decisions are made. The proposed approach relies on Knowledge Based Extensions to commercial CAE systems and 3D CAE models to enable and ensure Simulation Driven Design capabilities and contextual communication within the early stages of product development. The approach has been shown to increase the simulation-driven capabilities in a business-to-business scenario, and in extension, increase the foundation upon which decisions are made and the likelihood of reaching a feasible and optimal final design. In conclusion, a simulation-driven design approach to product development has to be more than enabled to truly make a difference in the development process. Investigation and evaluations show that supporting tools and relevant information must be made readily available, intuitive, integrated into the environment where they are needed and, ultimately, be perceived as a natural part of daily development in order for them to be accepted and used.

  • 152.
    Schwenk, Maximillian
    et al.
    Karlsruhe Institute of Technology.
    Fisk, Martin
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Cedell, Tord
    Lunds universitet.
    Hoffmeister, Jurgen
    Karlsruhe Institute of Technology.
    Schulze, Volker
    Karlsruhe Institute of Technology.
    Lindgren, Lars-Erik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Process simulation of single and dual frequency induction surface hardening considering magnetic nonlinearity2012Inngår i: Materials Performance and Characterization, E-ISSN 2165-3992, Vol. 1, nr 1Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A 2D computational model of single and simultaneous dual frequency induction hardening has been developed. Process specific aspects such as the nonlinear magnetic material behavior and phase transformation kinetics of quenched and tempered AISI 4140 are considered. Induction surface hardening experiments have been conducted for validation purposes. The measuring methodologies used to extract input data such as the magnetic material behavior, the current, and the effective heating time are presented. Metallurgical characterization and hardness profiles are compared with the results obtained from simulations. The temperature history, hardness depth profile, and hardness distribution are in good agreement

  • 153. Smith, Mike
    et al.
    Lindgren, Lars-Erik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Modeling of welding of austenitic stainless steels2014Inngår i: Encyclopedia of Thermal Stresses, Dordrecht: Encyclopedia of Global Archaeology/Springer Verlag, 2014, s. 3158-3165Kapittel i bok, del av antologi (Fagfellevurdert)
  • 154.
    Svoboda, Ales
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Lindgren, Lars-Erik
    Oddy, Alan S.
    Oddy/McDIll Numerical Investigations Sciences, Inc..
    Effective stress function algorithm for pressure-dependent plasticity applied to hot isostatic pressing1998Inngår i: International Journal for Numerical Methods in Engineering, ISSN 0029-5981, E-ISSN 1097-0207, Vol. 43, nr 4, s. 587-606Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    An algorithm for unconditionally stable and accurate integration of elasto-viscoplastic pressure-dependent constitutive model is presented. Rate form constitutive equations of thermal-elastoviscoplastic type with compressibility take into account the changes in relative density. The algorithm computes the deviatoric and volumetric creep strains by finding the value of the effective stress which satisfies the functional relationship, the effective stress function. Thus, one non-linear scalar equation is solved to find the unknown volumetric and deviatoric components of creep strain tensor. The tangent modulus is evaluated consistent with the integration algorithm. The application of the method to the simulation of hot isostatic pressing of metal powder is shown. The paper presents the solution of the verification problem and comparison with the experimental result.

  • 155.
    Svoboda, Ales
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Wedberg, Dan
    Lindgren, Lars-Erik
    Simulation of metal cutting using a physically based plasticity model2010Inngår i: Modelling and Simulation in Materials Science and Engineering, ISSN 0965-0393, E-ISSN 1361-651X, Vol. 18, nr 7Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Metal cutting is one of the most common metal shaping processes. Specified geometrical and surface properties are obtained by break-up of the material removed by the cutting edge into a chip. The chip formation is associated with a large strain, high strain rate and a locally high temperature due to adiabatic heating which make the modelling of cutting processes difficult. This study compares a physically based plasticity model and the Johnson-Cook model. The latter is commonly used for high strain rate applications. Both material models are implemented into the finite element software MSC.Marc and compared with cutting experiments. The deformation behaviour of SANMAC 316L stainless steel during an orthogonal cutting process is studied.

  • 156.
    Svoboda, Ales
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Wedberg, Dan
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik.
    Lindgren, Lars-Erik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Kalhori, Vahid
    AB Sandvik Coromant, Sandviken.
    Lundblad, Mikael
    AB Sandvik Coromant, Sandviken.
    Simulation of mechanical cutting using a material model based on dislocation density2007Inngår i: Computational plasticity X: Fundamentals and Applications, International Center for Numerical Methods in Engineering (CIMNE), 2007, Vol. 1, s. 330-334Konferansepaper (Fagfellevurdert)
  • 157.
    Söderberg, Magnus
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Lundbäck, Andreas
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Lindgren, Lars-Erik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Modeling of metal deposition2013Inngår i: Trends in welding research: proceedings of the 9th International Conference on Trends in Welding Research, June 4-8, 2012, Hilton Chicago/Indian Lakes Resort, Chicago, Illinois, USA / [ed] Tarasankar DebRoy, Materials Park, OH: ASM International, 2013, s. 853-858Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Modeling and simulation of metal deposition with focus on alleviating the work of the modeler is presented in this paper. The usage of dissimilar meshes for the base plate and the material to be deposited is investigated. The nodes that reside in the interface between the base plate and added material are connected with so called glued contact. The results are compared with previously published results from a model with identical geometry and process parameters. Measurements from the previous study are also included. The temperature results show very good agreement between the models and measurements. Observed deviations in deformation results between the reference simulations and the computed results are believed to originate from the element activation procedure in combination with the contact approach. Overall, the method is considered to have potential for facilitating the process of modeling and simulating metal deposition.

  • 158.
    Tam, S.C.
    et al.
    Nanyang Technological Institute.
    Lindgren, Lars-Erik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Yang, L.J.
    Nanyang Technological Institute.
    Computer simulation of temperature fields in mechanised plasma-arc welding1989Inngår i: Journal of Mechanical Working Technology, ISSN 0378-3804, Vol. 19, nr 1, s. 23-33Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The process of the mechanised plasma-arc butt-welding of thin-gauge mild-steel sheets has been studied, both theoretically and experimentally. The transient temperature distribution has been computed using an analytical model due to Rosenthal. The results have then been compared with those generated by finite-element analysis using the commercial package PAFEC. The two sets of results were found to be in reasonably good agreement; moreover, the theoretical values were found to correlate fairly well with the results of experiments performed on a Messer Griesheim Uniwig G-200P plasma-arc welding machine.The extent of the heat-affected zone (HAZ) in the butt-welded specimens has been computed by analysing the temperature history at points lying transverse to the weldment: the theoretical values match fairly closely with those obtained from the welding experiments.The efficiency of the plasma-arc welding process has been estimated to be around 32% to 35%.

  • 159.
    Tersing, Henrik
    et al.
    Volvo Aero Corporation.
    Lorentzon, John
    Volvo Aero Corporation.
    Francois, Arnaud
    Cenaero.
    Lundbäck, Andreas
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Babu, Bijish
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Barboza, Josué
    Cenaero.
    Bäcker, Vladimir
    Laboratory for Machine Tools and Production Engineering of RWTH Aachen University.
    Lindgren, Lars-Erik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Simulation of manufacturing chain of a titanium aerospace component with experimental validation2012Inngår i: Finite elements in analysis and design (Print), ISSN 0168-874X, E-ISSN 1872-6925, Vol. 51, s. 10-21Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Manufacturing of advanced components like aeroengine parts is performed in a global network. Different manufacturers deliver individual components to the engine and even different manufacturing steps for a given component may be performed at different companies. Furthermore, quality is of utmost importance in this context. Simulations are increasingly used to assure the latter. The current paper describes the simulation of a chain of manufacturing processes for an aeroengine component. Different partners have performed the simulations of the different steps using a variety of finite element codes. The results are discussed in the paper and particularly the lessons learned regarding the modelling process.

  • 160.
    Thipprakmas, Sutasn
    et al.
    Department of Tool and Materials Engineering, King Mongkut's University of Technology Thonburi, Bangkok.
    Joun, Man Soo
    School of Mechanical Engineering, Engineering Research Institute, Gyeongsang National University.
    Lindgren, Lars-Erik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Modern Engineered Materials and Technologies for Metal Forming Applications2017Inngår i: Advances in Materials Science and Engineering, ISSN 1687-8434, E-ISSN 1687-8442, Vol. 2017, artikkel-id 3196509Artikkel i tidsskrift (Fagfellevurdert)
  • 161.
    Tian, Rong
    et al.
    Northwestern University, Evanston.
    Chan, Stephanie
    Northwestern University, Evanston.
    Tang, Shan
    Northwestern University, Evanston.
    Kopacz, Adrian M.
    Northwestern University, Evanston.
    Wang, Jian-Sheng
    QuesTek Innovations LLC, Evanston, IL..
    Jou, Herng-Jeng
    QuesTek Innovations LLC, Evanston, IL..
    Siad, Larbi
    Université de Reims.
    Lindgren, Lars-Erik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Olson, Gregory B.
    Northwestern University, Evanston.
    Liu, Wing Kam
    Northwestern University, Evanston.
    A multiresolution continuum simulation of the ductile fracture process2010Inngår i: Journal of the mechanics and physics of solids, ISSN 0022-5096, E-ISSN 1873-4782, Vol. 58, nr 10, s. 1681-1700Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    With the advancement in computational science that is stepping into the Petascale era and experimental techniques that enable rapid reconstruction of the 3D microstructure, quantitative microstructure simulations at an unprecedented fidelity level are giving rise to new possibilities for linking microstructure to property. This paper presents recent advances in 3D computational modeling of ductile fracture in high toughness steels. Ductile fracture involves several concurrent and mutually interactive mechanisms at multiple length scales of microstructure. With serial sectioning tomographic techniques, a digital data set of microstructure features associated with the fracture process has been experimentally reconstructed. In this study, primary particles are accurately and explicitly modeled while the secondary particles are modeled by a two scale multiresolution continuum model. The present numerical simulation captures detailed characteristics of the fracture process, such as zigzag crack morphology, critical void growth ratios, local stress triaxiality variation, and intervoid ligament structure. For the first time, fracture toughness is linked to multiscale microstructures in a realistic large 3D model.

  • 162.
    Toda-Caraballo, I.
    et al.
    Department of Physical Metallurgy, Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Madrid.
    Chao, J.
    Department of Physical Metallurgy, Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Madrid.
    Lindgren, Lars-Erik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Capdevila, C.
    Department of Physical Metallurgy, Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Madrid.
    Effect of residual stress on recrystallization behavior of mechanically alloyed steels2010Inngår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 62, nr 1, s. 41-44Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper presents a finite element modeling analysis of deformation on iron-base mechanically alloyed oxide dispersion strengthened alloy by spherical indentations (Brinell test). Results of the model are used to interpret the role of residual shear stresses on the development of recrystallized grain structure and the temperature at which recrystallization occurs.

  • 163. Troive, Lars
    et al.
    Lindgren, Lars-Erik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Jonsson, Mikael
    Axial collapse load of a girth butt-welded pipe1995Inngår i: Thermal stresses '95: proceedings of the First International Symposium on Thermal Stresses and Related Topics, June 5 - 7, 1995, Shizoka University, Shizuoka University , 1995, s. 565-568Konferansepaper (Fagfellevurdert)
  • 164.
    Vaz, Miguel
    et al.
    State University of Santa Catarina.
    Owen, Roger
    University of Wales.
    Kalhori, Vahid
    AB Sandvik Coromant, Sandviken.
    Lundblad, Mikael
    AB Sandvik Coromant, Sandviken.
    Lindgren, Lars-Erik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Modelling and simulation of machining processes2007Inngår i: Archives of Computational Methods in Engineering, ISSN 1134-3060, E-ISSN 1886-1784, Vol. 14, nr 2, s. 173-204Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The modelling of metal cutting has proved to be particularly complex due to the diversity of physical phenomena involved, including thermo-mechanical coupling, contact/friction and material failure. The present work outlines the wide range of complex physical phenomena involved in the chip formation in a descriptive manner. In order to improve and understand the process different numerical strategies have been used for simulation. Several of these numerical strategies are reviewed and a short discussion of their relative merits and drawbacks is presented. By means of several examples, where a combined experimental/numerical effort was undertaken, we try to illustrate what numerical techniques, models and pertinent parameters are needed for successful simulations.

  • 165.
    Wedberg, Dan
    et al.
    AB Sandvik Coromant, Metal Cutting Research.
    Lindgren, Lars-Erik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Modelling flow stress of AISI 316L at high strain rates2015Inngår i: Mechanics of materials (Print), ISSN 0167-6636, E-ISSN 1872-7743, Vol. 91, nr 1, s. 194-207Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Modelling of the material behaviour is crucial for machining simulations. Strain and strain rates can reach values of 1–10 and 103–106 s−1 during the severe deformations associated with machining. An existing dislocation density model for AISI 316L based on a coupled set of evolution equations for dislocation density, mono vacancy concentration is enhanced in order to accommodate plastic deformation at high strain rates. Two mechanisms are evaluated with respect to their contribution in this respect. One is rate dependent cell formation and the other is dislocation drag due to phonons and electrons. Furthermore a temperature and strain rate dependent recovery and a proportionality interaction factor and short range component that both depends on the dislocation density are also considered. High strain rate compression tests are performed using Split-Hopkinson technique at various initial temperatures. Experimental results are then used to calibrate the models via an optimization procedure. Evaluation of various flow stress models shows that the flow stress behaviour of 316L stainless steel is best modelled by the model with a rate dependent cell formation. Its numerical solution is implemented in a format suitable for large-scale finite element simulations

  • 166.
    Wedberg, Dan
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik.
    Lindgren, Lars-Erik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Predictive capability of constitutive model outside the range of calibration2011Inngår i: Computational Plasticity XI - Fundamentals and Applications: proceedings of the XI International Conference on Computational Plasticity - fundamentals and applications held in Barcelona, Spain, 07 - 09 September 2011, Barcelona: CINME , 2011, s. 307-317Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Machining one of the most common manufacturing processes within the industry but it is also a process with extreme conditions in the vicinity of the cutting insert. Due to diversity of physical phenomena involved machining has proven to be complex and difficult to simulate. The chip formation process is in the vicinity of the cutting insert associated with highly localized severe deformations accompanied by high local temperatures rise. Furthermore, the strain rate can in the primary zone be very high (>50000 s -1), far beyond what can be reached with conventional mechanical material tests. Therefore, the possibility to extrapolate the material model outside the calibration range with respect to strain rate is a wanted feature. It is recognized that the mechanical behavior at high strain rate differs considerably from that observed at low strain rates and that the flow stress increase rapidly with the strain rates above ∼1000 s -1. The predictive abilities outside as well as inside the calibration range of the empirical Johnson-Cook plasticity model and a dislocation density based model are compared and discussed with reference to AISI 316L stainless steel. The results clearly show the difficulty of obtaining a comprehensive material model that predicts the material behavior across the loading conditions that can occur in machining with good accuracy and that the accuracy of extrapolation is uncertain

  • 167.
    Wedberg, Dan
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik.
    Svoboda, Ales
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Lindgren, Lars-Erik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Modelling high strain rate phenomena in metal cutting simulation2012Inngår i: Modelling and Simulation in Materials Science and Engineering, ISSN 0965-0393, E-ISSN 1361-651X, Vol. 20, nr 8, s. 85006-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Chip formation in metal cutting is associated with large strains and high strain rates, concentrated locally to deformation zones in front of the tool and beneath the cutting edge. Furthermore, dissipative plastic work and friction work generate high local temperatures. These phenomena together with numerical complications make modelling of metal cutting difficult. Material models, which are crucial in metal cutting simulations, are usually calibrated based on data from material testing. Nevertheless, the magnitude of strains and strain rates involved in metal cutting are several orders higher than those generated from conventional material testing. A highly desirable feature is therefore a material model that can be extrapolated outside the calibration range. In this study, two variants of a flow stress model based on dislocation density and vacancy concentration are used to simulate orthogonal metal cutting of AISI 316L stainless steel. It is found that the addition of phonon drag improves the results somewhat but the addition of this phenomenon still does not make it possible to extrapolate the constitutive model reliably outside its calibration range.

  • 168. Wikander, Lars
    et al.
    Karlsson, Lennart
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Produkt- och produktionsutveckling.
    Lindgren, Lars-Erik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Oddy, Alan S.
    Luleå tekniska universitet.
    Plane thermo-mechanical finite element modelling of welding with special reference to the material behaviour1994Inngår i: International conference proceedings on modeling and control of joining processes: December 8 - 10, 1993, Orlando, Florida / [ed] Thomas Zacharia, Miami, Fla: American Welding Society , 1994, s. 517-524Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The influence of phase changes on the residual strains in a welded hollow steel beam were investigated. A D-section beam is fabricated by U-bending 6 mm thickness SS142712 plate and welding in 10 mm thickness SS142132 plate under restraint at 0.993 MJ/m heat input. Finite element analyses were used to determine residual stresses due to cold bending and for thermomechanical welding analysis. Previously published modelling was modified to include the effect of transformation induced plasticity; cross weld residual strain distribution predicted by the two models and measured experimentally were compared; discrepancies are discussed

  • 169. Wikander, Lars
    et al.
    Karlsson, Lennart
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Produkt- och produktionsutveckling.
    Lindgren, Lars-Erik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Oddy, A.S.
    Plane thermo-mechanical finite element modelling of welding with special reference to the material behaviour1993Inngår i: First International Symposium on Process Industry Piping: December 14 - 17, 1993, Orlando, Florida USA / [ed] J.E. Aller, Houston, Tex: NACE International, 1993Konferansepaper (Fagfellevurdert)
  • 170.
    Zamani, Mohammadreza
    et al.
    Department of Materials and Manufacturing, School of Engineering, Jönköping University.
    Dini, Hoda
    Department of Materials and Manufacturing, School of Engineering, Jönköping University.
    Svoboda, Ales
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Lindgren, Lars-Erik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Seifeddine, Salem
    Department of Materials and Manufacturing, School of Engineering, Jönköping University.
    Andersson, Nils-Eric
    Department of Materials and Manufacturing, School of Engineering, Jönköping University.
    Jarfors, Anders E.W.
    Department of Materials and Manufacturing, School of Engineering, Jönköping University.
    A dislocation density based constitutive model for as-cast Al-Si alloys: Effect of temperature and microstructure2017Inngår i: International Journal of Mechanical Sciences, ISSN 0020-7403, E-ISSN 1879-2162, Vol. 121, s. 164-170Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The flow stress of an as-cast Al-Si based alloy was modeled using a dislocation density based model. The developed dislocation density-based constitutive model describes the flow curve of the alloy with various microstructures at quite wide temperature range. Experimental data in the form of stress-strain curves for different strain rates ranging from 10−4 to 10−1 s−1 and temperatures ranging from ambient temperature up to 400 °C were used for model calibration. In order to model precisely the hardening and recovery process at elevated temperature, the interaction between vacancies and dissolved Si was included. The calibrated temperature dependent parameters for different microstructure were correlated to the metallurgical event of the material and validated. For the first time, a dislocation density based model was successfully developed for Al-Si cast alloys. The findings of this work expanded the knowledge on short strain tensile deformation behaviour of these type of alloys at different temperature, which is a critical element for conducting a reliable microstructural FE-simulation.

  • 171.
    Zhang, Zhao
    et al.
    State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology.
    Wan, Zhenyu
    State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology.
    Lindgren, Lars-Erik
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.
    Tan, Z.J.
    State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology.
    Zhou, Xia
    State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology.
    The Simulation of Precipitation Evolutions and Mechanical Properties in Friction Stir Welding with Post-Weld Heat Treatments2017Inngår i: Journal of materials engineering and performance (Print), ISSN 1059-9495, E-ISSN 1544-1024, Vol. 26, nr 12, s. 5731-5740Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A finite element model of friction stir welding capable of re-meshing is used to simulate the temperature variations. Re-meshing of the finite element model is used to maintain a fine mesh resolving the gradients of the solution. The Kampmann–Wagner numerical model for precipitation is then used to study the relation between friction stir welds with post-weld heat treatment (PWHT) and the changes in mechanical properties. Results indicate that the PWHT holding time and PWHT holding temperature need to be optimally designed to obtain FSW with better mechanical properties. Higher precipitate number with lower precipitate sizes gives higher strength in the stirring zone after PWHT. The coarsening of precipitates in HAZ are the main reason to hinder the improvement of mechanical property when PWHT is used.

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