四点弯曲 III 混合型裂纹断特性T应力影响分析.pdf

Architectural Engineering February 2015, Volume 3, Issue 1, PP.7-13 The Effect of T-stress on the Crack Growth and Propagation of Specimen Subjected I-II Mixed Mode # Hongjie Liu, Zheming Zhu , Chao Wang School of Architecture and the Environment, Sichuan University, Chengdu Sichuan 610065, P.R.China #Email: zhuzm1965@163.com Abstract Cracked rock masses are usually subjected to complex loading conditions. Because of arbitrary orientation of cracks relative to the loading directions, brittle fracture in rocks may occur due to a combination of two major fracture modes, i.e. crack opening mode (mode I) and crack sliding mode (mode II). Therefore, the studying of rock fracture on I-II mixed mode has important Theoretical significance and work value. Current widely used fracture criterion for I-II mixed mode crack, such as MTS (Maximum tangential stress criterion), SED (Minimum strain energy density criterion), G (Maximum energy release rate criterion) have not consider the effect of T-stress. This paper has studied the effect of T-stress on the crack growth and propagation through Theoretical analysis, ABAQUS finite element method simulation, experiment studying by anti-symmetric four-point bend specimen. Keywords: I-II Mixed Mode Crack; T-stress; Crack Growth and Propagation; ABAQUS Finite Element Method 四点弯曲I-II 混合型裂纹断裂特性T 应力影响分析* 刘宏杰，朱哲明，王超 四川大学 建筑与环境学院，四川 成都 610065 摘 要：工程岩体大多处于复杂的应力环境中。由于岩体裂纹走向相对于荷载方向的随机性，岩体脆性断裂多数由于I-II 混合型裂纹的产生，因此研究岩石I-II 混合型裂纹断裂有着非常重要的理论意义和工程价值。现行通用的适用于I-II 混合 型裂纹的断裂准则，如最大周向应力准则，即MTS （Maximum tangential stress criterion ）准则，最小应变能密度准则，即 SED （Minimum strain energy density criterion ）准则，最大应变能释放准则，即G （Maximum e