Change search
Refine search result
1 - 18 of 18
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1. Achani, D.
    et al.
    Eriksson, Magnus
    SINTEF Materials and chemistry, Applied mechanics and corrosion, Trondheim, Norway.
    Hopperstad, O.S.
    Lademo, O.-G.
    Modelling of local necking and fracture in aluminium alloys2007In: 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 (Refereed)
  • 2. Bylund, Nicklas
    et al.
    Eriksson, Magnus
    Simulation driven car body development using property based models2001In: Proceedings of the IBEC 2001, International Body Engineering Conference and Exhibition: October 16 - 18, 2001, Detroit, Michigan, USA ; co-located at Cobo Center with Digital Car Conference & Exhibition, Detroit: Society of Automotive Engineers, Incorporated , 2001Conference paper (Refereed)
    Abstract [en]

    A method for the development of car bodies, from conceptual to detailed design, is presented. The conceptual design is broken down to a numerical property- based model (PBM) representing the mechanical behavior of the concept. In the PBM, the local properties are balanced to fulfill the global stiffness requirements. The main topology is defined and the structural components, i.e., joints, beams and sheets are connected in predefined nodes and represented in a finite element (FE) model as super elements, beam elements and thin shell elements. In the realization of the car structure, the performance of the PBM components are used as requirements in the detailed design. Different technologies, materials and manufacturing processes can be considered as long as the properties of the component agree with the ones stated by the PBM. The detailed design of each component is made by design engineers, supported by single purpose tools. The design engineers iterate the design until only a small difference between target and component performance exists

  • 3.
    Börvik, Tore
    et al.
    Norwegian University of Science and Technology (NTNU), Trondheim.
    Clausen, Arild H.
    Norwegian University of Science and Technology (NTNU), Trondheim.
    Eriksson, Magnus
    Berstad, Torodd
    SINTEF Materials and Chemistry.
    Langseth, Magnus
    Norwegian University of Science and Technology (NTNU), Trondheim.
    Experimental and numerical study on the perforation of AA6005-T6 panels2005In: International Journal of Impact Engineering, ISSN 0734-743X, E-ISSN 1879-3509, Vol. 32, no 1-4, p. 35-64Article in journal (Refereed)
    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.

  • 4. Eriksson, Magnus
    Modelling and simulation in the development of high strength steel components for vehicle structures2000Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    The licentiate 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 thermo-mechanical 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.

  • 5. Eriksson, Magnus
    Modelling of forming and quenching of ultra high strength steel components for vehicle structures2002Doctoral 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.

  • 6. Eriksson, Magnus
    et al.
    Häggblad, Hans-åke
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Berggren, C.
    Nobel Biocare AB.
    Andersson, M.
    Nobel Biocare AB.
    Holmersson, R.
    Nobel Biocare AB.
    Carlström, E.
    Swedish Ceramic Institute, PO Box 5403, SE-402 29 Göteborg.
    New semi-isostatic high velocity compaction method to prepare titanium dental copings2004In: Powder Metallurgy, ISSN 0032-5899, E-ISSN 1743-2901, Vol. 47, no 4, p. 335-342Article in journal (Refereed)
    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.

  • 7. Eriksson, Magnus
    et al.
    Lademo, O.G.
    Hopperstad, O.S.
    Development and use of in-plane shear tests to identify ductile failure parameters of aluminium alloys2006In: ESAFORM 2006 : The 9th International Conference on Material Forming; Glasgow, United Kingdom April 26 - 28, 2006 / [ed] Neal Juster, Krakow: Akapit , 2006Conference paper (Refereed)
  • 8. Eriksson, Magnus
    et al.
    Oldenburg, Mats
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Finite element forming simulations in the development of high strength tubular components2001In: International Journal of Engineering Simulation, ISSN 1468-1137, Vol. 2, no 4Article in journal (Refereed)
    Abstract [en]

    Light weight structures with high structural performance are one of the most important goals for automotive and transportation applications. One manufacturing technology, aiming to enable low weight design, is the combined forming and quenching of tubular thin-walled profiles of high strength steel. For optimal utilisation of this technology it is necessary to simulate and analyse the processes involved in a fast and efficient way. In this work, experiments of high temperature bending of thin walled profiles are performed and the forming response force is compared with results from finite element simulations. The analysed forming is modelled as a constant temperature forming and the material data for the specified temperature is evaluated from experiments and literature. The simulations and experiments are conducted to study the ability of the finite element model to predict high temperature forming characteristics and simulate the influence of profile and tool geometry. The need for further improvements and developments in the simulation technology is however identified. This work is part of a research project LOWHIPS (Low Weight High Performance Steel structures) aiming to obtain new knowledge concerning the involved forming and quenching processes and how they will affect the performance of the product.

  • 9. Eriksson, Magnus
    et al.
    Oldenburg, Mats
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Finite element modelling of tubular beams subjected to high temperature forming2000In: 3rd ESAFORM Conference on Material Forming, Inst. of steam and gas turbines, RWTH , 2000Conference paper (Refereed)
  • 10. Eriksson, Magnus
    et al.
    Oldenburg, Mats
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Numerical and experimental investigation of the spray cooling process for sheet metal components2002In: Proceedings CD of the Fifth World Congress on Computational Mechanics, Vienna, Austria, July 7 - 12, 2002, Vienna: Vienna University of Technology , 2002Conference paper (Refereed)
  • 11. Eriksson, Magnus
    et al.
    Oldenburg, Mats
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Somani, M.C.
    University of Oulu.
    Karjalainen, L.P.
    University of Oulu.
    Testing and evaluation of material data for analysis of forming and hardening of boron steel components2002In: 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)
    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.

  • 12. Eriksson, Magnus
    et al.
    Wikman, Bengt
    Bergman, Greger
    Estimation of material parameters at elevated temperatures by inverse modelling of a Gleeble experiment2000In: IUTAM Symposium on Field Analysis for Determination of Material Parameters - Experimental and Numerical Aspects: proceedings of the IUTAM Symposium held in Abisko National Park, Kiruna, Sweden, July 31 - August 4, 2000 / [ed] P. Ståhle, Dordrecht: Encyclopedia of Global Archaeology/Springer Verlag, 2000Conference paper (Refereed)
  • 13.
    Kinell, Lars
    et al.
    Luleå tekniska universitet.
    Eriksson, Magnus
    Sjödahl, Mikael
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
    Component forming simulations validated using optical shape measurements2003In: 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 (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

  • 14. Norberg, O.
    et al.
    Puccio, W.
    Olsen, J.
    Barabash, Stas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology.
    Andersson, L.
    Winningham, J.D.
    Jonsson, U.
    Luleå tekniska universitet.
    Eriksson, Magnus
    Munin: a student nanosatellite for space weather information1999In: Microsatellites as research tools: Proceedings of COSPAR Colloquium on Microsatellites as Research Tools held in Tainan, Taiwan, 14-17 December 1997 / edited by Fei-Bin Hsiao., Elsevier, 1999Conference paper (Refereed)
  • 15.
    Odd-Geir, Lademo
    et al.
    SINTEF.
    Berstad, Torodd
    SINTEF.
    Eriksson, Magnus
    SINTEF Materials and Chemistry; Structural Impact Laboratory (SIMLab), Department of Structural Engineering, Norwegian University of Science and Technology.
    Tryland, Tore
    Hydro Aluminium Structures.
    Furu, Trond
    Hydro Aluminium R&D.
    Langseth, Magnus
    Norwegian University of Science and Technology (NTNU), Trondheim.
    Hopperstad, Odd Sture
    Norwegian University of Science and Technology (NTNU), Trondheim.
    A model for process-based crash simulation2008In: International Journal of Impact Engineering, ISSN 0734-743X, E-ISSN 1879-3509, Vol. 35, no 5, p. 376-388Article in journal (Refereed)
    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.

  • 16.
    Somani, Mahesh C.
    et al.
    Uleåborg universitet.
    Karjalainen, Pentti
    Uleåborg universitet.
    Eriksson, Magnus
    Oldenburg, Mats
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Dimensional changes and microstructural evolution in a B-bearing steel in the simulated forming and quenching process2001In: ISIJ International, ISSN 0915-1559, E-ISSN 1347-5460, Vol. 41, no 4, p. 361-367Article in journal (Refereed)
    Abstract [en]

    To improve the modelling of the behaviour of steel profiles in the forming and quenching process, the influences of high-temperature plastic deformation and applied stress on the martensitic transformation were investigated in a B-bearing steel by dilatometric measurements and compression tests. The plastic deformation of austenite was found to enhance ferrite formation so significantly that the dilatation due to the low-temperature transformation decreases even at a cooling rate of 280°C/s. The presence of ferrite in the microstructure results in markedly lower hardness and flow stress than the completely martensitic microstructure. Possibilities to avoid ferrite formation have been discussed. Stress applied during the martensitic transformation increases diametric dilatation by as much as 200 % under axial compression, which seems to result from the preferred orientation of the martensite formed. However, subsequent to a hightemperature plastic deformation, the influence of applied stress remains much smaller.

  • 17. Somani, M.C.
    et al.
    Karjalainen, L.P.
    Oldenburg, Mats
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Eriksson, Magnus
    Effects of plastic deformation and stresses on dilatation during the martensitic transformation in a B-bearing steel2001In: Journal of Materials Science & Technology, ISSN 1005-0302, Vol. 17, no 2, p. 203-206Article in journal (Refereed)
    Abstract [en]

    To provide data for improved modelling of the behaviour of steel components in a simultaneous forming and quenching process, the effects of plastic deformation and stresses on dilatation during the martensitic transformation in a B-bearing steel were investigated. It was found that plastic deformation of austenite at high temperatures enhances ferrite formation significantly, and consequently, the dilatation decreases markedly even at a cooling rate of 280°C/s. The created ferritic-martensitic microstructure possesses clearly lower hardness and strength than the martensitic structure. Elastic stresses cause the preferred orientation in martensite to be formed so that diametric dilatation can increase by nearly 200% under axial compression

  • 18.
    Tarigopula, Venkapati
    et al.
    Norwegian University of Science and Technology (NTNU), Trondheim.
    Hopperstad, Odd Sture
    Norwegian University of Science and Technology (NTNU), Trondheim.
    Langseth, Magnus
    Norwegian University of Science and Technology (NTNU), Trondheim.
    Clausen, Arild Holm
    Norwegian University of Science and Technology (NTNU), Trondheim.
    Hild, F
    Universite Paris.
    Lademo, Odd-Geir
    SINTEF.
    Eriksson, Magnus
    SINTEF Materials and Chemistry, Trondheim, Norway.
    A study of large plastic deformations in dual phase steel using digital image correlation and FE analysis2008In: Experimental mechanics, ISSN 0014-4851, E-ISSN 1741-2765, Vol. 48, no 2, p. 181-196Article in journal (Refereed)
    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.

1 - 18 of 18
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf