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应用Ｊ积分理论，讨论了屈服材料中小裂纹的Ｊ积分和ＣＯＤ与裂纹尺寸ａ及标称应变ｅ的函数关系，分析了压力容器高应力区中裂纹容限，讨论了压力容器在设计压力及水压试验压力下，不同部位所允许的最大裂纹尺寸计算。
J integral theory is applied to discuss the J integral of small cracks in yielding material and the function of COD as a function of crack size a and nominal strain e. The crack tolerance in high stress zone of pressure vessel is analyzed. The influence of pressure vessel on design pressure and water Pressure test pressure, different parts of the maximum allowable crack size calculation.