【摘要】 针对焊接接头中母材、焊缝、热影响区的性能各不相同的问题,利用有限元方法,建立了焊接接头有限元计算模型,编写了J积分有限元计算程序。计算结果表明,在平面应变和平面应力两种状态下,焊接接头三个不同裂纹位置的J积分值与全母材和全焊缝材料的J积分值均不相同,但具有一定的规律性;裂纹分别处于焊接接头不同位置时的J积分有限元计算结果也不相同。根据各种情况下的有限元计算结果,结合焊接结构安全评定的工程实际提出了指导意见和建议。更多还原

【Abstract】 In considering the mechanically different problems of all base metal, all weld metal and hot-effect zone properties in welded joints, the finite element method is used to establish the finite element calculation model for welded joints and to prepare the finite element calculation program for J-integration in this paper. The calculation results indicate that under the two states of plane strain and plan stress, the J-integral values at three different locations of welded joints are different from those of all base material and all weld material. But there is a certain law. In addition, the J-integral finite element calculation results of cracks at the same welded joint in different locations are not the same. Both in combining the two finite element calculation results in different cases and in considering the engineering real conditions of safety assessment of welded structures, this paper suggests some concrete guiding suggestions and recommendations.更多还原