【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。更多还原

【Abstract】 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.更多还原