作　　者： ; ;

机构地区： 大连大学建筑工程学院

出　　处： 《大连大学学报》 2007年第6期88-92,共5页

摘　　要： 应用材料破坏分析软件MFPA2D(Material Failure Process Analysis),模拟了平面应力下双向应力比不断变化条件下脆性材料的不同破坏失稳过程,以玻璃为例,重点研究了玻璃在复杂应力状态下不同双向应力比对脆性材料裂纹扩展和断裂的影响.研究结果表明,裂纹失稳扩展时的应力强度因子值随着双向应力比的升高而升高.该结果证明双向应力确实对脆性材料的断裂韧性有影响.通过将理论分析得出的应变失效准则与数值模拟研究结果及试验结果的比较研究表明,应变失效准则作为脆性材料在双向应力下的断裂准则是可行的. The fracture behavior of brittle materials under different stress ratio has been investigated by means of the numerical simulation method with software MFPA^2D （ Material Failure Process Analysis）. The fracture dependence of brittle material on biaxial plane stress state was confirmed. The results show that the critical stress intensity factor under biaxial stress increases with the increasing of biaxial stress ratio. The simulation tests results reveal that the biaxial stresses have strong influence on the fracture properties of glass. The results confirmed that the strain criterion of fracture which is obtained by theoretical analysis and compared with numerical simulation and experimental results is feasible for brittle materials while under complex stress state.

关 键 词： 脆性材料 应力比 数值模拟 应变断裂准则

领　　域： [建筑科学]