【摘要】 本文利用新开发的热双重非线性有限元程序,计算了不同材质不同裂纹尺寸下的中心裂纹板试件,在单纯热应力作用下及热(?)机械载荷联合作用下的修正J积分J~0。对各种情况下的J~0变化趋势进行丁探讨,并以此为标准对已有的两种含二次应力的评定方法进行了评价。更多还原

【Abstract】 In this paper, using a newly developed program system of thermo-double-nonlinear finite el-ement, the modified J integral-Jθ of the centre-cracked plate speciments, which are made from different materials and in different crack size have been calculated, under the action of thermal stress only and the combined thermo-mechanical stresses. Furthermore, authors discuss the change ten-dency of Jθ under different conditions, and also evaluates the two existing assessing methods which take the secondary stress into account.更多还原