A phase-field ductile fracture model with a variable regularization length parameter

Jike Han, Shinnosuke Nishi, Kenji Takada, Mayu Muramatsu, Masaki Omiya, Kensuke Ogawa, Kai Oide, Takuya Kobayashi, Masanobu Murata, Shuji Moriguchi, Kenjiro Terada

Research output: Contribution to journalArticle

Abstract

In the last decade, one of the gradient damage models called “phase-field fracture model” has been receiving attention. The model for brittle fractures has acquired great success, but that for ductile fractures is still under development. In this context, we propose a novel phase-field model with a variable regularization length parameter that is defined as an increasing function of the measure of the plastic strain. Since the regularization length parameter l representing the width of a diffuse crack is known to determine the damaged region around the crack, it has been modified so as to increase depending on the amount of plastic deformation. Thanks to this variable regularization length parameter l, the phase-field parameter d is calculated in consideration of the damage due to plastic deformation. The conventional elasto-plastic model with J2 theory in plasticity is employed and couple to our proposed phase-field model. Several numerical examples are conducted to demonstrate the capability of our proposed model and validate the introduction of l in comparison with the experimental result.

Original languageEnglish
Article number20200005
Pages (from-to)1-15
Number of pages15
JournalTransactions of the Japan Society for Computational Engineering and Science
Volume2020
DOIs
Publication statusPublished - 2020

Keywords

  • Crack propagation
  • Ductile fracture
  • Length parameter
  • Phase-field

ASJC Scopus subject areas

  • Computer Science(all)
  • Engineering(all)

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