非均质结构裂纹的J积分守恒性的理论研究(Ⅱ)

ON THE CONSERVATION OF J-INTEGRAL OF NON—HOMOGENEOUS CRACK (Ⅱ)

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.