岩土力学2011，Vol.32Issue(10)：3155-3162,8.
冲击载荷作用下准脆性材料Ⅱ型裂纹扩展研究
Study of mode Ⅱ crack propagation of quasi-brittle material under impact loading
摘要
Abstract
Dynamic failure of quasi-brittle materials under dynamic loading has been a hot issue; the direction of crack propagation of pre-cracked specimens with mode II crack subjected to impact shear loading is closely related to its mechanical properties and impact velocity. The numerical simulations of dynamic shear crack propagation in specimens with two parallel edge pre-notches subjected to impact loading were carried out to investigate the propagation of mode II crack using rock failure process analysis-dynamic code. The effects of material properties, material heterogeneity, incident stress pulse amplitude and duration on the mode II crack propagation path were also investigated. The numerical results show that the mode II crack propagation under impact loading is induced by the shear damage as well as the tensile damage. Microcracks around main-crack are due to the material heterogeneity, which in turn influences the crack bifurcation and associated stress fields around cracks. Crack branching occurs and the specimen is further damaged when stress amplitude and duration are respectively beyond a certain value. The study result is of great help to investigate the law of mode II crack propagation and reveals the mechanism of damage and fracture of quasi-brittle materials under impact loading.关键词
Ⅱ型裂纹扩展/应力波/非均匀性/准脆性材料/冲击载荷Key words
mode Ⅱ crack propagation/ stress wave/ heterogeneity/ quasi-brittle material/ impact loading分类
建筑与水利引用本文复制引用
袁琳,徐涛,赵高峰,杨岳峰,陈庚..冲击载荷作用下准脆性材料Ⅱ型裂纹扩展研究[J].岩土力学,2011,32(10):3155-3162,8.基金项目
国家自然科学基金项目资助(No.41172265,No.50874020) （No.41172265,No.50874020）
地质灾害防治与环境保护国家重点实验室基金资助(No.SKLGP2010K008) （No.SKLGP2010K008）
教育部留学回国人员科研基金资助(2011年). （2011年）
