应力比对脆性材料断裂影响及应变断裂准则验证  

Influence of stress ratio on fracture behavior of brittle materials and testification of strain criterion of fracture

作　　者：李维红[1] 陈雄[1] 王怀亮[2] 宋玉普[2] 

机构地区：[1]大连大学建筑工程学院,辽宁大连116622 [2]大连理工大学土木水利学院,辽宁大连116024

出　　处：《大连理工大学学报》2007年第3期403-407,共5页Journal of Dalian University of Technology

基　　金：建设部研究开发资助项目(06-k7-15);中国博士后科学基金资助项目(20060400970)

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,并以玻璃为例,重点研究了其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.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 ratios has been investigated by means of numerical simulation method with software MFPAZD（material failure process analysis） in plane stress state. The stress ratiors influence on the crack propagation and fracture of brittle materials is further studied by glassrs simulation under different biaxial stress states. The results show that the critical stress intensity factor under biaxial stress increases with the increase of biaxial stress ratio. The simulation results actually reveal that the biaxial stresses have strong influence on the fracture toughness properties of brittle materials. Furthermore, the strain criterion is feasible to the brittle materials under complex stress state by the theoretical and numerical comparative analyses.

关 键 词：脆性材料 应力比 数值模拟 应变断裂准则 

分 类 号：TU501[建筑科学—建筑技术科学]