论文部分内容阅读
钝化线是描述裂纹试样在钝化过程中J积分与伸张区宽度(stretch zone width,SZW)间关系的一条直线,在J积分测试中,有效数据区的左右界限线以及确定延性断裂韧度JⅠC的偏置线都是建立在钝化线基础上的,因而钝化线在J积分测试中至关重要。通过对裂尖钝化过程的分析,基于D-B模型和J积分的路径无关性原理推导出一种钝化线方程。与现行标准中的钝化线相比,此方程与试验结果吻合得更好。
The passivation line is a straight line describing the relationship between the J integral and the stretch zone width (SZW) of the cracked specimen during the passivation test. In the J-integral test, the left and right limit lines of the valid data area and the ductile fracture toughness The bias line of JI C is based on the passivation line, so the passivation line is crucial in the J-integral test. Based on the analysis of the crack tip passivation process, a passivation equation is derived based on the principle of path independence of D-B model and J-integral. Compared with the passivation line in the current standard, this equation is in good agreement with the experimental results.