中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
A novel micromechanics-enhanced phase-field model for frictional damage and fracture of quasi-brittle geomaterials

文献类型:期刊论文

作者You, Tao1,2; Waisman, Haim3; Chen, Wei-Zhong4; Shao, Jian-Fu1,2; Zhu, Qi-Zhi1,2
刊名COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
出版日期2021-11-01
卷号385页码:38
ISSN号0045-7825
关键词Phase field damage Degradation function Length scale parameter Micromechanics Frictional sliding of microcracks Riedel shear band
DOI10.1016/j.cma.2021.114060
英文摘要Cracking in quasi-brittle geomaterials is a complex mechanical phenomenon, driven by various dissipation mechanisms across multiple length scales. While some recent promising works have employed the phase-field method to model the damage and fracture of geomaterials, several open questions still remain. In particular, capturing frictional sliding along the lips of microcracks, incorporating lower scale physics, and calibrating the length scale parameter, are some examples. The present paper addresses these essential problems. By leveraging homogenization-based damage-friction coupling formulations for microcracked solids, the linkage is built between the macroscopic phase-field damage variable and the microcrack density parameter. The phase-field is thus treated not only as an indicator for the location of cracks but also accounts for the density of microcracks. A unified Helmholtz free energy function is then constructed as a sum of the bulk energy ( including elastic strain energy and plastic free energy) and the crack surface energy. Furthermore, a new set of degradation functions for the plastic free energy are provided, and a calibration procedure for the length scale parameter is proposed by reflecting a more realistic description of fracture process zone. In addition, an accelerated staggered iteration algorithm is developed to solve the strongly coupled problem more efficiently. Four numerical examples concerning a system of macroscopic cracks are investigated to illustrate the predictive capability of the proposed model in simulating tensile fracture, fault slippage and shear bands. (C) 2021 Elsevier B.V. All rights reserved.
资助项目National Key Researchand Development Program of China[2017YFC1501100] ; National Natural Science Foundation of China[11872172]
WOS研究方向Engineering ; Mathematics ; Mechanics
语种英语
出版者ELSEVIER SCIENCE SA
WOS记录号WOS:000691816700002
源URL[http://119.78.100.198/handle/2S6PX9GI/27873]  
专题中科院武汉岩土力学所
通讯作者Zhu, Qi-Zhi
作者单位1.Hohai Univ, Minist Educ Geomech & Embankment Engn, Key Lab, Nanjing 210098, Peoples R China
2.Hohai Univ, Coll Civil & Transportat Engn, Nanjing 210024, Peoples R China
3.Columbia Univ, Dept Civil Engn & Engn Mech, New York, NY 10027 USA
4.Chinese Acad Sci, Inst Rock & Soil Mech, Wuhan 430071, Hubei, Peoples R China
推荐引用方式
GB/T 7714
You, Tao,Waisman, Haim,Chen, Wei-Zhong,et al. A novel micromechanics-enhanced phase-field model for frictional damage and fracture of quasi-brittle geomaterials[J]. COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING,2021,385:38.
APA You, Tao,Waisman, Haim,Chen, Wei-Zhong,Shao, Jian-Fu,&Zhu, Qi-Zhi.(2021).A novel micromechanics-enhanced phase-field model for frictional damage and fracture of quasi-brittle geomaterials.COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING,385,38.
MLA You, Tao,et al."A novel micromechanics-enhanced phase-field model for frictional damage and fracture of quasi-brittle geomaterials".COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 385(2021):38.

入库方式: OAI收割

来源:武汉岩土力学研究所

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