直接由KIc/KIa～(T-RTNDT)的实测数据统计分析反应堆压力容器用钢断裂韧性值的概率分布

摘要

在反应堆压力容器的结构完整性评定中,ASME规范中选择材料大量断裂韧性数据的下包络线来确定断裂韧度,这在反应堆压力容器结构完整性的概率评定中会产生过于保守的结果.为此,利用三参数威布尔分布模型和对数正态分布模型分别对起裂韧性KIc数据和动态止裂韧性KIa数据进行统计分析,并给出了断裂韧性的统计分布模型.%The ASME reference curve which is the lower bound of K values measured from numerous large - scale fracture toughness experiments of RPV steels was used to calculate the fracture toughness for the structural integrity assessment of RPV. The ASME method will bring conservative results to the probabilistic structural integrity assessment of RPV, statistical analysis of plane - strain static initiation toughness , Kic, and plane - stain crack - arrest toughness, Kia, with 3 - parameter Weibull distribution and lognormal distribution respectively, a new statistical model of RPV steel fracture toughness is provided.