双向应力对失效评定图的影响

文中通过弹塑性有限元方法探索了双向应力对失效评定曲线的影响，同时比较了弹塑性有限元建立的失效评定曲线与Ｒ６选择１曲线。从工程角度出发，单向应力条件下的Ｒ６选择１曲线可粗略地作为双向应力下含缺陷结构的失效评定方法，但更精确的评定必须考虑双向应力影响。文中同时还研究了双向应力对Ｊ积分守恒性及数值的影响。

Influence of biaxial stress on the tailure assessmentCurves.

The influence of biaxial stress on the failure assess-ment curves was discussed by using finite element method ,and a comparison was made between the failure asscssmentcurves established with elasticplastic finite clementmethod and R6 option 1 curve. The R6 option 1 curve underthe condition of uniaxial stress could be basically the failureassessment method for the structure with defects under thecondition of biaxial stress. the influence of biaxial stressshould be considered for inore accurate assesstnent at engi-neering viewpoint. The influence of biaxial stress on theconservation of J integral and numeric value was studied.