基于J-Q双参数准则的材料裂纹体失效评定曲线工程化研究  

Study of Engineering Treatment of Failure Assessment Curves of Cracked Structure Based on Double-parameter J～Q criterion

作　　者：张敏[1] 马博[1] 李小瑞[2] 

机构地区：[1]西安理工大学材料科学与工程学院,710048 [2]武汉钢铁(集团)公司钢铁分公司,430083

出　　处：《核动力工程》2004年第5期430-433,451,共5页Nuclear Power Engineering

基　　金：陕西省教育厅自然科学基金资助项目(01JK134)

摘　　要：针对应力三轴性对裂纹尖端应力应变场的影响,讨论了均匀材料裂纹体的断裂准则,建立了基于J^Q双参数准则的失效评定曲线。利用有限元数值解的结果,得到了失效评定曲线中各参量的工程估算方法。通过实例,对本文所建立失效评定曲线的计算方法和现有的计算途径进行了比较。Considering the influence of stress-triaxiality on stress-strain field near crack tip, the theory that used to access the integrity of homogeneous materials has been discussed in this paper. In addition, the failure assessment curves of cracked structure based on double-parameter J^Q criterion are founded. By util-izing the finite element numerical results, the engineering treatment methods of each factor in the failure as-sessment curves are obtained. In the end, calculatiion approach for the failure assessment curves set up in this paper has been compared with the available procedure.

关 键 词：失效评定曲线 J-Q双参数准则 断裂参量 有限元法 

分 类 号：TG401[金属学及工艺—焊接]