材料科学
极限抗拉强度
数字图像相关
脆性
复合材料
弹性模量
失效模式及影响分析
压缩(物理)
单轴张力
裂隙
剪切(地质)
结构工程
工程类
作者
Han Wang,Yongtao Gao,Yu Zhou
标识
DOI:10.1016/j.tafmec.2021.103167
摘要
Unfilled cross fissures are defects that widely exist in natural rock, and their existence has a significant impact on the mechanical behaviour of the rock. To investigate the effects of different fissure cross angles (α) and fissure lengths (Lh and Li) on the macroscopic mechanical behaviour, crack development law, ultimate failure mode and final crack distribution of preflawed rock-like specimens, four groups of rock-like material specimens with unfilled cross fissures are fabricated and subjected to uniaxial compression tests using digital image correlation (DIC) technology monitoring, computerized tomography (CT) scanning, and three-dimensional particle coding (PFC3D). These results reveal that the uniaxial compression strength (UCS) and elastic modulus (E) of the specimens all show a nonlinear increase–decrease-increase changing law with increasing α and are all weakened to a certain extent. However, the peak strain (εf) of the specimens shows a nonlinear decrease-increase changing law with increasing α. Based on DIC technology, the influence of α and Lh and Li on the crack development law can be observed. These three parameters mainly affect the crack initiation location of all specimens, and two kinds of ultimate failure modes (shear-tensile mode and tensile mode) can be observed. Based on CT scanning and PFC3D numerical simulation, it can be seen that the final crack system inside the specimen is a 3D system, and the analytical method used to analyse it should contain 2D (DIC technology) and 3D aspects (CT scanning and PFC3D simulation) at the same time.
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