No Cover Image

Journal article 149 views 17 downloads

A phase-field model for mixed-mode fracture based on a unified tensile fracture criterion / Qiao Wang, Yuntian Feng, Wei Zhou, Yonggang Cheng, Gang Ma

Computer Methods in Applied Mechanics and Engineering, Volume: 370, Start page: 113270

Swansea University Authors: Qiao Wang, Yuntian Feng

  • 54613.pdf

    PDF | Accepted Manuscript

    © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/

    Download (3.71MB)

Abstract

Different fracture patterns can be observed because of different material properties, even the geometry and loading are the same. However, most of the known phase-field fracture models have only considered the tensile failure and may not be directly applicable to the shear fracture. In this paper, a...

Full description

Published in: Computer Methods in Applied Mechanics and Engineering
ISSN: 0045-7825
Published: Elsevier BV 2020
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa54613
Tags: Add Tag
No Tags, Be the first to tag this record!
Abstract: Different fracture patterns can be observed because of different material properties, even the geometry and loading are the same. However, most of the known phase-field fracture models have only considered the tensile failure and may not be directly applicable to the shear fracture. In this paper, a phase-field model for mixed-mode fracture is proposed based on a unified tensile fracture criterion. The proposed model is developed from the unified phase-field theory and the original unified phase-field model can be recovered as a particular case. General softening laws for cohesive zone models can also be considered. The unified tensile fracture criterion is embedded in the proposed mixed-mode phase-field model and different fracture patterns can be obtained in the simulation according to the material properties, including failures based on both maximum normal stress and maximum shear stress criteria. The crack propagation direction can be easily determined by the unified tensile fracture criterion. Compared with the classical phase-field model, two additional material parameters are needed, i.e., the failure tension strength and the ratio of the critical shear failure stress to the critical normal fracture stress. Numerical examples have shown that the proposed model has the ability to model mixed-mode fractures, and can also be applied to rock-like brittle materials under compression.
Keywords: Phase-field fracture model, Shear fracture, Mixed-mode fracture, Unified tensile fracture criterion
Start Page: 113270