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Eriksson, Magnus
Publications (10 of 18) Show all publications
Odd-Geir, L., Berstad, T., Eriksson, M., Tryland, T., Furu, T., Langseth, M. & Hopperstad, O. S. (2008). A model for process-based crash simulation (ed.). International Journal of Impact Engineering, 35(5), 376-388
Open this publication in new window or tab >>A model for process-based crash simulation
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2008 (English)In: International Journal of Impact Engineering, ISSN 0734-743X, E-ISSN 1879-3509, Vol. 35, no 5, p. 376-388Article in journal (Refereed) Published
Abstract [en]

Manufacturing of a bumper system from aluminium extrusions often involves series of forming operations performed in the soft W-temper condition, and then artificially age-hardening of the components to the material's peak hardness T6 condition. It is probable that proper finite element (FE) modelling of the crash performance of the resulting systems must rely upon a geometry obtained from an FE model following the process route, i.e., including simulation of all major forming operations. The forming operations also result in an inhomogeneous evolution of some internal variables (among others the effective plastic strain) within the shaped components. Results from tensile tests reveal that plastic straining in W-temper leads to a significant change of the T6 work-hardening curves. In addition, the tests show that the plastic pre-deformation causes a reduction of the elongation of the T6 specimens. In the present work, these process effects have been included in a user-defined elastoplastic constitutive model in LS-DYNA incorporating a state-of-the-art anisotropic yield criterion, the associated flow rule and a non-linear isotropic work hardening rule as well as some ductile fracture criteria. A first demonstration and assessment of the modelling methodology is shown by ‘through-process analysis' of two uniaxial tensile test series. The industrial use and relevance of the modelling technique is subsequently demonstrated by a case study on an industrial bumper beam system.

National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-10458 (URN)10.1016/j.ijimpeng.2007.03.004 (DOI)000253564400008 ()94587ef0-27e3-11dd-8187-000ea68e967b (Local ID)94587ef0-27e3-11dd-8187-000ea68e967b (Archive number)94587ef0-27e3-11dd-8187-000ea68e967b (OAI)
Note

Validerad; 2008; 20080522 (magnus)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2019-06-04Bibliographically approved
Tarigopula, V., Hopperstad, O. S., Langseth, M., Clausen, A. H., Hild, F., Lademo, O.-G. & Eriksson, M. (2008). A study of large plastic deformations in dual phase steel using digital image correlation and FE analysis (ed.). Experimental mechanics, 48(2), 181-196
Open this publication in new window or tab >>A study of large plastic deformations in dual phase steel using digital image correlation and FE analysis
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2008 (English)In: Experimental mechanics, ISSN 0014-4851, E-ISSN 1741-2765, Vol. 48, no 2, p. 181-196Article in journal (Refereed) Published
Abstract [en]

Large plastic deformation in sheets made of dual phase steel DP800 is studied experimentally and numerically. Shear testing is applied to obtain large plastic strains in sheet metals without strain localisation. In the experiments, full-field displacement measurements are carried out by means of digital image correlation, and based on these measurements the strain field of the deformed specimen is calculated. In the numerical analyses, an elastoplastic constitutive model with isotropic hardening and the Cockcroft - Latham fracture criterion is adopted to predict the observed behaviour. The strain hardening parameters are obtained from a standard uniaxial tensile test for small and moderate strains, while the shear test is used to determine the strain hardening for large strains and to calibrate the fracture criterion. Finite Element (FE) calculations with shell and brick elements are performed using the non-linear FE code LS - DYNA. The local strains in the shear zone and the nominal shear stress-elongation characteristics obtained by experiments and FE simulations are compared, and, in general, good agreement is obtained. It is demonstrated how the strain hardening at large strains and the Cockcroft - Latham fracture criterion can be calibrated from the in-plane shear test with the aid of non-linear FE analyses.

National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-6353 (URN)10.1007/s11340-007-9066-4 (DOI)000254236200004 ()4960fa00-27e1-11dd-8187-000ea68e967b (Local ID)4960fa00-27e1-11dd-8187-000ea68e967b (Archive number)4960fa00-27e1-11dd-8187-000ea68e967b (OAI)
Note

Validerad; 2008; 20080522 (magnus)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2019-06-04Bibliographically approved
Achani, D., Eriksson, M., Hopperstad, O. & Lademo, O.-G. (2007). Modelling of local necking and fracture in aluminium alloys (ed.). In: (Ed.), J.M.A. Cesar de Sa; Abel D. Santos (Ed.), Materials processing and design : modeling, simulation and applications ; NUMIFORM '07: proceedings of the 9th International Conference on Numerical Methods in Industrial Forming Processes, Porto, Portugal, 17 - 21 June 2007. Paper presented at International Conference on Numerical Methods in Industrial Forming Processes : 17/06/2007 - 21/06/2007 (pp. 111-116). American Institute of Physics (AIP)
Open this publication in new window or tab >>Modelling of local necking and fracture in aluminium alloys
2007 (English)In: Materials processing and design : modeling, simulation and applications ; NUMIFORM '07: proceedings of the 9th International Conference on Numerical Methods in Industrial Forming Processes, Porto, Portugal, 17 - 21 June 2007 / [ed] J.M.A. Cesar de Sa; Abel D. Santos, American Institute of Physics (AIP), 2007, p. 111-116Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2007
Series
A I P Conference Proceedings Series, ISSN 0094-243X ; 908
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-27946 (URN)10.1063/1.2740797 (DOI)000246933500012 ()18efd850-27d2-11dd-8187-000ea68e967b (Local ID)0-7354-0415-1 (ISBN)18efd850-27d2-11dd-8187-000ea68e967b (Archive number)18efd850-27d2-11dd-8187-000ea68e967b (OAI)
Conference
International Conference on Numerical Methods in Industrial Forming Processes : 17/06/2007 - 21/06/2007
Note

Validerad; 2007; 20080522 (cira)

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2019-06-04Bibliographically approved
Eriksson, M., Lademo, O. & Hopperstad, O. (2006). Development and use of in-plane shear tests to identify ductile failure parameters of aluminium alloys (ed.). In: (Ed.), Neal Juster (Ed.), ESAFORM 2006 : The 9th International Conference on Material Forming; Glasgow, United Kingdom April 26 - 28, 2006: . Paper presented at ESAFORM Conference on Material Forming : 26/04/2006 - 28/04/2006. Krakow: Akapit
Open this publication in new window or tab >>Development and use of in-plane shear tests to identify ductile failure parameters of aluminium alloys
2006 (English)In: ESAFORM 2006 : The 9th International Conference on Material Forming; Glasgow, United Kingdom April 26 - 28, 2006 / [ed] Neal Juster, Krakow: Akapit , 2006Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Krakow: Akapit, 2006
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-38312 (URN)ca91ef80-27d2-11dd-8187-000ea68e967b (Local ID)83-89541-66-1 (ISBN)ca91ef80-27d2-11dd-8187-000ea68e967b (Archive number)ca91ef80-27d2-11dd-8187-000ea68e967b (OAI)
Conference
ESAFORM Conference on Material Forming : 26/04/2006 - 28/04/2006
Note

Godkänd; 2006; 20080522 (cira)

Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-02-27Bibliographically approved
Börvik, T., Clausen, A. H., Eriksson, M., Berstad, T. & Langseth, M. (2005). Experimental and numerical study on the perforation of AA6005-T6 panels (ed.). International Journal of Impact Engineering, 32(1-4), 35-64
Open this publication in new window or tab >>Experimental and numerical study on the perforation of AA6005-T6 panels
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2005 (English)In: International Journal of Impact Engineering, ISSN 0734-743X, E-ISSN 1879-3509, Vol. 32, no 1-4, p. 35-64Article in journal (Refereed) Published
Abstract [en]

Extruded aluminium panels find their use in many different structures such as offshore platforms, bridge decks, train and ship components and lightweight protection systems. Impacts or other types of high-speed loading conditions are thus a relevant issue for several of these applications. There are, however, not many investigations published on the perforation of extruded aluminium panels covering experiments in combination with numerical analyses. This paper presents an experimental and numerical study on the perforation of AA6005-T6 aluminium panels impacted by ogival-nosed steel projectiles. The chosen panel has three triangular-shaped cells with a total depth of 130 mm. The wall thickness is 6 mm in the front and rear side plate, and 3 mm in the slanting webs. A rather comprehensive material test programme has been carried out in order to determine the material's response to dynamic loading. The experimental results were used to calibrate slightly modified versions of the Johnson-Cook constitutive relation and fracture criterion. 3D numerical simulations of the perforation process were then performed on a high-performance computer using the MPP version of the explicit finite element code LS-DYNA. In the simulations, the typical dimension of the elements was less than 1 mm. The numerical model is able to capture the main trends in the experiments in an adequate manner, and excellent agreement between numerical and experimental results is obtained.

National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-14400 (URN)10.1016/j.ijimpeng.2005.05.001 (DOI)000233975800007 ()dc04bd60-27cd-11dd-8187-000ea68e967b (Local ID)dc04bd60-27cd-11dd-8187-000ea68e967b (Archive number)dc04bd60-27cd-11dd-8187-000ea68e967b (OAI)
Note

Validerad; 2005; 20080522 (cira)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2019-06-04Bibliographically approved
Eriksson, M., Häggblad, H.-å., Berggren, C., Andersson, M., Holmersson, R. & Carlström, E. (2004). New semi-isostatic high velocity compaction method to prepare titanium dental copings (ed.). Paper presented at . Powder Metallurgy, 47(4), 335-342
Open this publication in new window or tab >>New semi-isostatic high velocity compaction method to prepare titanium dental copings
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2004 (English)In: Powder Metallurgy, ISSN 0032-5899, E-ISSN 1743-2901, Vol. 47, no 4, p. 335-342Article in journal (Refereed) Published
Abstract [en]

A new method to prepare titanium dental copings from titanium powder was tested, involving high velocity compaction and various elastic forms, which were used to achieve a semi-isostatic effect during the impact. The tooth preparation die (mandrel) and the powder were placed inside an elastic form. The impact struck the elastic form, and the powder was compacted against the tooth preparation die. Several different elastomers were tested to find the best one. Cross-sections of the powder bodies were studied for density variations. The soft, flexible elastomer worked best to compact the powder. The highest densification could be focused closest to the mandrel where the coping should be milled out. The density in the highest density areas could locally reach 98-99%. If the method with elastic forms could be optimised to give as high a density as without elastic forms, a lower shrinkage and possible deformation of the copings could be reached.

National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-12412 (URN)10.1179/003258904225020828 (DOI)000226898500016 ()2-s2.0-13844319521 (Scopus ID)b8f8f3e0-fafb-11db-b816-000ea68e967b (Local ID)b8f8f3e0-fafb-11db-b816-000ea68e967b (Archive number)b8f8f3e0-fafb-11db-b816-000ea68e967b (OAI)
Note
Validerad; 2004; 20070505 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Kinell, L., Eriksson, M. & Sjödahl, M. (2003). Component forming simulations validated using optical shape measurements (ed.). In: (Ed.), Wolfgang Osten (Ed.), Optical Measurement Systems for Industrial Inspection III: 23 - 26 June 2003, Munich, Germany. Paper presented at Optical Measurement Systems for Industrial Inspection : 23/06/2003 - 26/06/2003 (pp. 409-419). Bellingham, Wash.: SPIE - International Society for Optical Engineering
Open this publication in new window or tab >>Component forming simulations validated using optical shape measurements
2003 (English)In: Optical Measurement Systems for Industrial Inspection III: 23 - 26 June 2003, Munich, Germany / [ed] Wolfgang Osten, Bellingham, Wash.: SPIE - International Society for Optical Engineering, 2003, p. 409-419Conference paper, Published paper (Refereed)
Abstract [en]

For validation of forming simulations a methodology, using optical shape measurements, is here presented. In this work, the shape of a sheet metal component with complex geometry is measured using projected fringes. The component in consideration is a closed section steel profile that is formed using a forming tool. The shape is measured using the reduced temporal phase unwrapping scheme and calibration data for the calculation of absolute coordinates in the local coordinate system. Local 3-D coordinates from several measurements of this long object are merged together through a feature based stitching program. To validate the finite-element model, the final shape of the forming simulation is compared to the results from the shape measurements. Since no computer aided design model exists for the formed beam, the features in shape of the measured object are used as references when comparing results

Place, publisher, year, edition, pages
Bellingham, Wash.: SPIE - International Society for Optical Engineering, 2003
Series
Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X ; 5144
National Category
Applied Mechanics Applied Mechanics
Research subject
Solid Mechanics; Experimental Mechanics
Identifiers
urn:nbn:se:ltu:diva-38377 (URN)10.1117/12.500668 (DOI)000184287300046 ()2-s2.0-0141608760 (Scopus ID)cc09f320-bb55-11db-b560-000ea68e967b (Local ID)819450146 (ISBN)cc09f320-bb55-11db-b560-000ea68e967b (Archive number)cc09f320-bb55-11db-b560-000ea68e967b (OAI)
Conference
Optical Measurement Systems for Industrial Inspection : 23/06/2003 - 26/06/2003
Note
Validerad; 2003; 20120123 (ysko)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-07-10Bibliographically approved
Eriksson, M. (2002). Modelling of forming and quenching of ultra high strength steel components for vehicle structures (ed.). (Doctoral dissertation). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Modelling of forming and quenching of ultra high strength steel components for vehicle structures
2002 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The doctoral thesis deals with modelling and simulations in integrated product and process development. The research concerns with development of models and methods for simulation of component manufacturing and product functionality. One aim of the research project is to enable the introduction of tubular high strength components in vehicle structures. The new type of structure components requires changes in the product development process in order to closely couple the design with the development of the manufacturing tools and process parameters. The coupling is performed with the development and introduction of new modelling and simulation methods and tools for the analysis of thermomechanical forming of tubular high strength components. In this work the requirements for the numerical models are studied and evaluated by comparisons with experimental results. A set of tests are defined, performed and evaluated for establishing the required material parameters for the analysis of the manufacturing process. An inverse modelling method has been developed for evaluation of continuous cooling and deformation experiments performed in Gleeble 1500 thermomechanical simulator equipment. Spray cooling experiments have been designed for the modelling of the cooling effects of different types of spray nozzles. A model and an algorithm for the introduction of water spray cooling from a set of water spray nozzles has been developed and implemented in to a thermomechanical analysis code. A tool and a set of experiments are used for the verification of thermomechanical analyses of the component forming and quenching process.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2002. p. 31
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544 ; 2002:19
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-26638 (URN)f51c9470-d581-11db-8550-000ea68e967b (Local ID)f51c9470-d581-11db-8550-000ea68e967b (Archive number)f51c9470-d581-11db-8550-000ea68e967b (OAI)
Note

Godkänd; 2002; 20061110 (haneit)

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-24Bibliographically approved
Eriksson, M. & Oldenburg, M. (2002). Numerical and experimental investigation of the spray cooling process for sheet metal components (ed.). In: (Ed.), (Ed.), Proceedings CD of the Fifth World Congress on Computational Mechanics, Vienna, Austria, July 7 - 12, 2002: . Paper presented at World congress on computational mechanics : 07/07/2002 - 12/07/2002. Vienna: Vienna University of Technology
Open this publication in new window or tab >>Numerical and experimental investigation of the spray cooling process for sheet metal components
2002 (English)In: Proceedings CD of the Fifth World Congress on Computational Mechanics, Vienna, Austria, July 7 - 12, 2002, Vienna: Vienna University of Technology , 2002Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Vienna: Vienna University of Technology, 2002
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-29881 (URN)380373d0-bb5b-11db-b560-000ea68e967b (Local ID)3-9501554-0-6 (ISBN)380373d0-bb5b-11db-b560-000ea68e967b (Archive number)380373d0-bb5b-11db-b560-000ea68e967b (OAI)
Conference
World congress on computational mechanics : 07/07/2002 - 12/07/2002
Note
Godkänd; 2002; Bibliografisk uppgift: 1 CD-ROM; 20070116 (cira)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Eriksson, M., Oldenburg, M., Somani, M. & Karjalainen, L. (2002). Testing and evaluation of material data for analysis of forming and hardening of boron steel components (ed.). Paper presented at . Modelling and Simulation in Materials Science and Engineering, 10(3), 277-294
Open this publication in new window or tab >>Testing and evaluation of material data for analysis of forming and hardening of boron steel components
2002 (English)In: Modelling and Simulation in Materials Science and Engineering, ISSN 0965-0393, E-ISSN 1361-651X, Vol. 10, no 3, p. 277-294Article in journal (Refereed) Published
Abstract [en]

Finite element modelling and simulation is becoming an increasingly important tool in the development process for structural automotive components, manufactured using thermo-mechanical forming techniques. Accurate and reliable analysis of coupled thermo-mechanical processes requires efficient simulation tools as well as good quality and relevant material data, usually obtained by experimental testing of the mechanical and thermal properties. The work present in this paper concerns methods for obtaining and evaluating the mechanical properties, required for modelling the high-temperature forming of a high-strength boron-alloyed steel. The material data was obtained from high temperature compression tests and dilatometric measurements made using a Gleeble 1500 thermo-mechanical simulator. Two examples of finite element simulations using the data obtained are also presented. The first example is an isothermal finite element simulation of a thin-walled tubular beam subjected to high-temperature bending. The predicted press force showed acceptable agreement with experimental results in the initial part of the process. In the second example, a cylindrical specimen compressed during continuous cooling was simulated, and the press force and radial displacement were compared with experimental results. Again the simulations showed acceptable agreement with experimental results but indicated the need for further improvements in the simulation technology and methods used for material parameter evaluation.

National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-3937 (URN)10.1088/0965-0393/10/3/303 (DOI)000176154200005 ()2-s2.0-0036565247 (Scopus ID)1c986dd0-6f75-11db-962b-000ea68e967b (Local ID)1c986dd0-6f75-11db-962b-000ea68e967b (Archive number)1c986dd0-6f75-11db-962b-000ea68e967b (OAI)
Note
Validerad; 2002; 20060924 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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