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Estimate of material parameters using inverse modelling and their application to sheet metal forming simulations
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.ORCID iD: 0000-0002-4634-4373
Luleå University of Technology, Department of Engineering Sciences and Mathematics.
2004 (English)In: Materials Processing and Design: Modeling, Simulation and Applications (NUMIFORM 2004) / [ed] Somnath Ghosh, Melville, NY: American Institute of Physics (AIP), 2004, p. 869-874Conference paper, Published paper (Refereed)
Abstract [en]

In metal forming operations the stress and strain levels can locally reach much higher magnitudes than those measurable in a standardised uniaxial tension test. Additionally, the stress and strain states are in many cases multi-axial. In this paper an inverse method to obtain material data is proposed. The aim is to yield more accurate data for a wider range of strain compared to a standard uniaxial tensile test. The outline of the work is that a forming experiment is designed to reproduce tensile strains present in a full-scale cold forming process. The blanks used are made of relatively thick high strength hot-rolled steel. Process data from experiments, i.e. punch force and punch displacement, are used as input to an in-house optimisation software package. The direct problem solved in the inverse modelling and optimisation scheme is a finite element analysis (FEA) of the experiment. The goal is to find parameters in a constitutive model of the material that minimises the difference between experimental and FE-calculated data. The experiments are modelled in a commercial FE software. Four different isotropic hardening laws are used in the FE-model. One of the optimised models is applied in a forming simulation and geometric optimisation of a demonstrator part.

Place, publisher, year, edition, pages
Melville, NY: American Institute of Physics (AIP), 2004. p. 869-874
Series
A I P Conference Proceedings Series, ISSN 0094-243X ; 712
National Category
Applied Mechanics Other Mechanical Engineering
Research subject
Solid Mechanics; Computer Aided Design
Identifiers
URN: urn:nbn:se:ltu:diva-35891DOI: 10.1063/1.1766636Local ID: a9e4e580-8c7e-11db-8975-000ea68e967bISBN: 0-7354-0188-8 (print)OAI: oai:DiVA.org:ltu-35891DiVA, id: diva2:1009145
Conference
International Conference on Numerical Methods in Industrial Forming Processes : 13/06/2004 - 17/06/2004
Note
Godkänd; 2004; 20061215 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-04-12Bibliographically approved

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CiteExportLink to record
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