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Material parameters identification: An inverse modeling methodology applicable for thermoplastic materials

Abstract

The methodology proposed in this work uses the local measured strain rate history as the applied “load” to the finite element (FE) “material point”. Next, with this strain rate history, two objective functions related to the true stress-strain and volumetric strain response could be minimized to identify some of the material parameters of the constitutive model. The whole identification process, of the 9 material parameters required, is described in detail. In addition, a short description of the hyperelastic-viscoplastic constitutive model used is given with an experimental program including mainly uniaxial tensile tests at different strain rates. The thermoplastic material investigated here is a mineral and rubber modified polypropylene (PP) compound. The main experimental data uses 3D digital image correlation (DIC) to determine full-field displacements and deduce true stress-strain, volume dilatation and local strain rates curves during deformation.

Category

Academic article

Language

English

Author(s)

  • Mario A. Polanco-Loria
  • Hamid Daiyan
  • Frode Grytten

Affiliation

  • SINTEF Industry / Materials and Nanotechnology
  • SINTEF Industry

Year

2012

Published in

Polymer Engineering and Science

ISSN

0032-3888

Volume

52

Issue

2

Page(s)

438 - 448

External resources

View this publication at Cristin