材料科学
断裂力学
复合材料
断裂(地质)
弯曲
表面光洁度
非线性系统
裂缝闭合
三点弯曲试验
结构工程
断裂韧性
裂纹扩展阻力曲线
强度因子
工程类
量子力学
物理
作者
Wei Dong,Dong Yang,Binsheng Zhang,Zhimin Wu
出处
期刊:Journal of Engineering Mechanics-asce
[American Society of Civil Engineers]
日期:2018-06-01
卷期号:144 (6)
被引量:61
标识
DOI:10.1061/(asce)em.1943-7889.0001461
摘要
Experimental tests were conducted on composite rock-concrete specimens with four roughness profiles to investigate the propagation of interfacial cracks under three-point bending and four-point shear conditions. By measuring the initial fracture loads, various combinations of interfacial stress intensity factors (SIFs) of Modes I and II corresponding to the initial fracture conditions were determined. Based on these results, an expression for classifying the initiation of interfacial cracks in mixed Mode I-II fracture was derived by normalization, which could eliminate the effect of interfacial roughness. Furthermore, a criterion for specifying propagation of the interfacial crack that takes into account nonlinear interfacial characteristics was proposed, which indicated that the crack would start to propagate along the interface when the SIFs caused by the external loads and the cohesive stresses satisfied this criterion. Numerical simulations of the interfacial fracture process were also conducted, introducing the crack propagation criterion to predict load–versus crack mouth opening displacement (P-CMOD) curves. They revealed fairly good agreement with the experimental results. Finally, by combining the criterion for maximum circumferential stress with the proposed criterion for crack propagation, the interfacial crack propagation mode was assessed. The results indicated that, once the initial fracture toughnesses for the rock, the concrete, and the rock-concrete interface from the experimental work were obtained, the propagation of interfacial cracks and the corresponding fracture modes, including nonlinear characteristics of the materials and interface, could be predicted using the method derived in this study.
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