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research-article

Non-Linear Material Model in Part Variation Simulations of Sheet Metals

[+] Author and Article Information
Soner Camuz

Department of Industrial and Materials Science, Chalmers University of Technology, Gothenburg, Sweden
soner@chalmers.se

Samuel Lorin

Fraunhofer Chalmers Centre, Chalmers University of Technology, Gothenburg, Sweden
samuel.lorin@fcc.chalmers.se

Kristina Wärmefjord

Department of Industrial and Materials Science, Chalmers University of Technology, Gothenburg, Sweden
kristina.warmefjord@chalmers.se

Rikard Söderberg

Department of Industrial and Materials Science, Chalmers University of Technology, Gothenburg, Sweden
rikard.soderberg@chalmers.se

1Corresponding author.

ASME doi:10.1115/1.4042539 History: Received April 08, 2018; Revised December 13, 2018

Abstract

Current methodologies for variation simulation of compliant sheet metal assemblies and parts are simplified by assuming linear relationships. From observed physical experiments, it is evident that plastic strains are a source of error that is not captured in the conventional variational simulation methods. This article presents an adaptation towards an elasto-plastic material model with isotropic hardening in the Method of Influence Coefficients methodology for variation simulations. The results are presented in two case studies using a benchmark case involving a 2D quarter symmetric plate with a centred hole, subjected to both uniaxial and biaxial displacement. The adaptation shows a great reduction in CPU time with limited effect on the accuracy of the results compared to Direct Monte Carlo simulations.

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