Application of a model of plastic porous materials including void shape effects to the prediction of ductile failure under shear-dominated loadings

Léo Morin, Jean Baptiste Leblond, Viggo Tvergaard

Research output: Contribution to journalJournal articleResearchpeer-review

308 Downloads (Pure)

Abstract

An extension of Gurson's famous model (Gurson, 1977) of porous plastic solids, incorporating void shape effects, has recently been proposed by Madou and Leblond (Madou and Leblond, 2012a, 2012b, 2013; Madou et al., 2013). In this extension the voids are no longer modelled as spherical but ellipsoidal with three different axes, and changes of the magnitude and orientation of these axes are accounted for. The aim of this paper is to show that the new model is able to predict softening due essentially to such changes, in the absence of significant void growth. This is done in two steps. First, a numerical implementation of the model is proposed and incorporated into the SYSTUS® and ABAQUS® finite element programmes (through some freely available UMAT (Leblond, 2015) in the second case). Second, the implementation in SYSTUS® is used to simulate previous "numerical experiments" of Tvergaard and coworkers (Tvergaard, 2008, 2009, 2012, 2015a; Dahl et al., 2012; Nielsen et al., 2012) involving the shear loading of elementary porous cells, where softening due to changes of the void shape and orientation was very apparent. It is found that with a simple, heuristic modelling of the phenomenon of mesoscopic strain localization, the model is indeed able to reproduce the results of these numerical experiments, in contrast to Gurson's model disregarding void shape effects.
Original languageEnglish
JournalJournal of the Mechanics and Physics of Solids
Volume94
Pages (from-to)148-166
ISSN0022-5096
DOIs
Publication statusPublished - 2016

Keywords

  • Numerical simulations
  • Porous ductile materials
  • Shear loadings
  • Theoretical model
  • Void shape effects

Fingerprint

Dive into the research topics of 'Application of a model of plastic porous materials including void shape effects to the prediction of ductile failure under shear-dominated loadings'. Together they form a unique fingerprint.

Cite this