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单边缺口试样的J积分,当取其缺口内表面为积分回路时,有特别简单的形式,即,并可进一步简化为,其中。 本文对两种单边缺口试样(缺口根部曲率半径ρ分别为20毫米和9毫米),测定了缺口内表面的应变分布ε(θ),再经应力-应变曲线转换成形变功密度分布W(θ),最后通过数值积分求出系数A。试验结果与考虑了Weiss塑性区修正的线弹性断裂力学方法做了比较。
The J-integral of the unilateral notched specimen, when taken from the notched inner surface as an integral loop, has a particularly simple form, that is, and can be further simplified as, where. In this paper, two types of unilateral notched specimens (notch root radius of curvature ρ 20 mm and 9 mm, respectively) were measured, the notch surface strain distribution ε (θ), and then transformed into the stress-strain curve by the deformation power density distribution W (θ), and finally get the coefficient A by numerical integration. The experimental results are compared with the linear elastic fracture mechanics method that takes into account Weiss plastic zone correction.