Three-point bending test study on the propagation law of internal cracks and failure characteristics of brittle solids based on 3D-ILC technology

被引：0

作者：

Wang H. ^{[1
]}

Li H. ^{[1
,2
]}

Ren R. ^{[3
]}

Tang L. ^{[1
]}

Yu S. ^{[1
,2
]}

Zhang Z. ^{[1
]}

机构：

[1] State Key Laboratory of Hydrology-Water Resource and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing, 210029, Jiangsu

[2] College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, 210098, Jiangsu

[3] Shenzhen Water Group, Shenzhen, 518031, Guangdong

来源：

Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2019年 / 38卷 / 12期

基金：

中国国家自然科学基金;

关键词：

3D-ILC; Brittle material; Crack propagation; Fracture mechanics; Rock mechanics; Three-dimensional fracture; Three-point bending test;

D O I：

10.13722/j.cnki.jrme.2019.0358

中图分类号：

学科分类号：

摘要：

Crack propagation in rocks is one of the important issues in geotechnical engineering. Based on 3D-ILC technology, an ideal brittle material is selected, and the actual internal crack with arbitrary parameter is generated without affecting the surface of the sample. The three-point bending test of ideal brittle materialsamples containing actual random internal cracksgenerated without changing the sample surface was carried out and compared with the complete samples. Failure process, characteristic load, failure mode, fracture characteristics, dynamic bifurcation and stress moirewere analyzed, and the K-distribution and extension path of the crack tip were obtained by numerical simulation. The results show thatthe cracking and breaking loads of the specimenare reduced greatly due to the existence of internal cracks, and that the internal crack tip presents petal-like strain moirewhich can be monitored by the stress birefringence technology combined with 3D-ILC. Under three-point bending, the blank specimensoccur dynamic fractures with atomization, feather zone characteristics caused by dynamic crack bifurcation, while the crack-containing specimens gradually crack from the lower tip to the upper tip of the internal crack of a pure type-I failure in a drop-like shape with characteristics of the intersection Wallner line. It is also indicated that both the K-distribution at the crack tip based on M-integral and MTS-based internal crack propagation path simulation areconsistent with the test results. Compared with the current mainstream methods in the study of transparent rock, 3D-ILC has certain advancement in brittleness, crack authenticity, stress field visualization and fracture characteristics. The test and numerical simulation results will provide experimental and theoretical references for research on problems including internal crack propagation and three-dimensional fracture of brittle materials such as rock. © 2019, Science Press. All right reserved.

引用

页码：2463 / 2477

页数：14

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