压力容器接管角裂纹弹塑性断裂的工程分析方法研究

文中系统地研究了接管角裂纹二维平板模型的Ｊ积分全塑性解，新建立了以应力强度因子形状系数β为主导的全塑性解表达式；通过对式中塑性因子ω的特性分析，结合接管角二维模型与准三维模型的数学相似性对比，获得了依赖于二维模型解的准三维模型全塑性解。评定结果表明：使用准三维模型全塑性解可提高容器承压能力１０％～２０％，从而克服了二维平板模型解预测的保守性。

AN ENGINEERING APPROACH ON ELASTOPLASTIC FRACTURE ANALYSIS FOR NOZZLE CORNER CRACKS OF PRESSURE VESSELS

This paper explores the fully plastic J integral expression for two-dimensional flat plate model of Nozzle Corner Cracks. A new expression is giver on the basis of the shape coefficient of stress intensity, factor β. Through discussion of the plastic factor ω in the expression and the mathematical analogy between two-dimensional and quasi-three-dimensional models, a full, plastic solution of J-integral for the quasi-three dimensional model is obtained which is dependent upon existing two-dimensional model. It is shown that the bearing capacity will be 10% - 20% higher than that of the two-dimensional model when the three-dimensional model is employed Therefore, it is concluded that the three-dimensional model is less conservative than the two-dimensional plate model.