非均质结构裂纹的J积分守恒性的理论研究(Ⅰ)

ON THE CONSERVATION OF J-INTEGRAL OF NON-HOMOGENEOUS CRACK

用数学分析方法论证了焊缝区有垂直裂纹时J积分的守恒性，又用弹塑性有限元方法进行了数值验证．首次提出了J积分与路径有关的理论证明，为J积分在压力容器缺陷安全评定的应用提供了必要的依据．

The conservation of J-integral is proved with mathematical analysis method when there is vertical crack in the weld zone,and tested numerically with elastoplastic finite element method. The theoretical proof is first proposed that J-integral is interrelated with path, thus providing basis for the application of J-integral in the safety evaluation of the flaw of pressure container.