WES 2815:2014和UR S33标准中止裂韧性<i>K</i><sub>ca</sub>计算表达式的合理性分析

WES 2815:2014和UR S33标准中止裂韧性K_ca计算表达式的合理性分析

摘要: 针对WES 2815:2014《Test method for brittle crack arrest toughness,K_ca》和UR S33《Requirements for Use of Extremely Thick Steel Plates》中止裂韧性K_ca的计算表达式和裂纹偏转时K_ca的计算方法,利用有限元法计算了三种不同裂纹形式的双重拉伸试样的止裂韧性K_ca,基于计算结果指出了上述标准中止裂韧性K_ca计算表达式缺少一系数项,并给出了正确的K_ca计算表达式,同时提出裂纹偏转角度大时按照裂纹的直边投影计算K_ca是不合理的。

Abstract: Crack arrest toughness K_ca of three different crack types is calculated by finite element method for K_ca calculation expression and calculation method of crack deflection in WES 2815:2014 《Test method for brittle crack arrest toughness,K_ca》 and UR S33 《Requirements for Use of Extremely Thick Steel Plates》. The mistake of K_cacalculation expression in above standards is pointed out based on the FEM calculation results.It is unreasonable to calculate K_ca according to the length of crack straight projection for large crack deflection angle.