Micro-crack damage in strip of fracture process zone

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:147

Article

Wang Limin¹  Li Xia¹  Xu Shilang²  Wang Haiying³  Zhang Zhaojun¹ 

[1] Qingdao Univ Technol, Sch Sci, Qingdao 266033, Shandong, Peoples R China

[2] Zhejiang Univ, Coll Civil Engn & Architecture, Yuhangtang Rd 866, Hangzhou 310058, Zhejiang, Peoples R China

[3] Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China

关键词: Quasi-brittle materials;    Micro-crack;    Damage factor;    Fracture process zone;    Multi-scale mechanics;    Cohesive crack model;   

DOI  :  10.1016/j.ijsolstr.2018.04.008

来源: Elsevier

【 摘 要 】

Damage and fracture of quasi-brittle materials are non-reversible processes of micro-defects and micro-cracks, often accompanied by a strip of micro-crack damage along the end of the macro-crack or gap. In this work, the micro-crack damage parameters in the strip are calculated, and a mechanics model is proposed to analyze the relation between deformation and force. The mechanics parameters are also determined using meso-mechanics homogenization of the damage zone of the micro-crack strip. Then, calculations of the deformation and stress in the damage strip are introduced, and the damage factor is estimated using a cohesive crack model. Finally, the relationship between the micro-crack and macro-fracture zone is correlated to electron microscopy data of a cast iron specimen and numerical results. For the damage factor, damage density, and geometrical factors of micro-cracks, the meso-mechanics scale is correlated to macro-mechanics in the damage fracture process zone by combining the homogenization method and cohesive crack model of nonlinear fracture. (C) 2018 Elsevier Ltd. All rights reserved.

【 授权许可】

Free