Experimental Study on the Growth, Coalescence and Wrapping Behaviors of 3D Cross-Embedded Flaws Under Uniaxial Compression

被引：211
作者：
Zhou, Xiao-Ping [1 ,2 ]
Zhang, Jian-Zhi [1 ,2 ]
Wong, Louis Ngai Yuen [3 ]
机构：
[1] Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China
[2] Chongqing Univ, Sch Civil Engn, Chongqing 400045, Peoples R China
[3] Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China
来源：
ROCK MECHANICS AND ROCK ENGINEERING | 2018年 / 51卷 / 05期
基金：
中国国家自然科学基金;
关键词：
3D cross-embedded flaw; Petal crack; Crack propagation; Crack wrapping; Crack coalescence; ROCK-LIKE MATERIALS; CRACK COALESCENCE; FRACTURE COALESCENCE; PROPAGATION; INITIATION; SPECIMENS; SANDSTONE; FISSURES;
D O I：
10.1007/s00603-018-1406-4
中图分类号：
P5 [地质学];
学科分类号：
0709 ; 081803 ;
摘要：
The crack initiation, growth, wrapping and coalescence of two 3D pre-existing cross-embedded flaws in PMMA specimens under uniaxial compression are investigated. The stress-strain curves of PMMA specimens with 3D cross-embedded flaws are obtained. The tested PMMA specimens exhibit dominant elastic deformation and eventual brittle failure. The experimental results show that four modes of crack initiation and five modes of crack coalescence are observed. The initiations of oblique secondary crack and anti-wing crack in 3D cracking behaviors are first reported as well as the coalescence of anti-wing cracks. Moreover, two types of crack wrapping are found. Substantial wrapping of petal cracks, which includes open and closed modes of wrapping, appears to be the major difference between 2D and 3D cracking behaviors of pre-existing flaws, which are also first reported. Petal crack wraps symmetrically from either the propagated wing cracks or the coalesced wing cracks. Besides, only limited growth of petal cracks is observed, and ultimate failure of specimens is induced by the further growth of the propagated wing crack. The fracture mechanism of the tested PMMA specimens is finally revealed. In addition, the initiation stress and the peak stress versus the geometry of two 3D pre-existing cross-embedded flaws are also investigated in detail.
引用
收藏
页码：1379 / 1400
页数：22
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