摘要
基于计算J积分的等效原场应力方法,利用等效原场应力σeff只有外加载荷意义而不再具有拉伸或者弯曲等载荷类型方面的属性,提出了利用现有含裂纹结构的纯拉伸以及纯弯曲J积分全塑性解直接计算拉弯联合载荷下的J积分简化估算方法。该方法可以直接利用已经存在的J积分纯拉伸和纯弯曲全塑性解来计算拉弯联合载荷下的J积分,简化了拉弯联合载荷下J积分全塑性解的计算;并且可以应用于任意应力-应变材料,包括Ramborg-Osgood关系的材料和任意单调加载非R-O关系材料。计算过程简便。并通过与有限元计算结果对比对之进行验证,说明其工程实用性,为对含裂纹结构进行弹塑性断裂评定奠定基础。
Based on the equivalent remote stress method for J integral evaluations and its equivalent remote stress σeff merely related to an applied load,not related to the load types,such as a tension load or a bending load,the present paper derived out the J integral calculation equation of the structure with cracks under combined tension and bending deformations.The present method directly uses the available h1 solutions of the structure with cracks under a pure tension loading and a pure bending loading.It saves the time cost in solving the h1 solutions of cracks in the structure under combined tension and bending loads.It could be applied to any stress-strain relationships of materials,including R-O material and non-R-O material under monotonic increasing loadings.Its solution procedure is rather simple and numerical results are rather accurate.All the numerical results solved by the method are compared with FE results.
出处
《工程力学》
EI
CSCD
北大核心
2010年第3期6-9,44,共5页
Engineering Mechanics
基金
国家"十五"滚动课题项目(2004BA803B02-05)
北京市科技项目(D08050600380803)
关键词
断裂分析
等效原场应力
拉弯联合
裂纹
J积分
fracture analysis
equivalent remote stress
combined tension and bending
crack
J integral
