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

被引：0

作者：

Han J. ^{[1
]}

Nishi S. ^{[2
]}

Takada K. ^{[2
]}

Muramatsu M. ^{[3
]}

Omiya M. ^{[3
]}

Ogawa K. ^{[4
]}

Oide K. ^{[4
]}

Kobayashi T. ^{[4
]}

Murata M. ^{[5
]}

Moriguchi S. ^{[6
]}

Terada K. ^{[6
]}

机构：

[1] Department of Civil and Environmental Engineering, Tohoku University

[2] Honda R&D Co.,Ltd.

[3] Department of Mechanical Enginering, Keio University

[4] International Research Institute of Disaster Science, Tohoku University

来源：

Transactions of the Japan Society for Computational Engineering and Science | 2020年 / 2020卷

基金：

日本学术振兴会;

关键词：

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

D O I：

10.11421/jsces.2020.20200005

中图分类号：

学科分类号：

摘要：

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. © 2020 by the Japan Society for Computational Engineering and Science.

引用

页码：1 / 15

页数：14

共 36 条

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