基于两步七点拟合法ADB610钢概率疲劳裂纹扩展研究  

ADB610 Steel Fatigue Crack Propagation Based on Twice Seven Point Fitting

作　　者：张天会[1] 李华英[1] 薛彬[2] 王时越[2] 徐人平[2] 

机构地区：[1]云南农业大学工程技术学院,云南昆明650201 [2]昆明理工大学,云南昆明650051

出　　处：《压力容器》2012年第10期12-15,46,共5页Pressure Vessel Technology

摘　　要：介绍了两步七点递增多项式拟合方法(简称两步七点拟合法)计算一系列相同裂纹长度下成组多个试样的裂纹扩展速率,然后计算一系列相同裂纹长度在不同存活率下的裂纹扩展速率P-a-da/dN和基于Paris公式的裂纹扩展速率表达式P-da/dN-ΔK。并采用两步七点拟合法计算了广泛应用于压力容器的ADB610钢7个CT试样在一系列相同裂纹长度下的裂纹扩展速率,以及计算了ADB610钢在存活率分别为50%,90%,95%,99%和99.9%的裂纹扩展速率和基于Paris公式的裂纹扩展速率表达式,有助于ADB610钢抗疲劳断裂可靠性的分析研究。Twice seven data incremental polynomial fitting method（short for twice seven data fitting） was introduced which can be used to calculate fatigue crack propagation rate of each sample in a series of same crack length.Then fatigue crack propagation rate（P-a-da/dN） and the equations of fatigue crack propagation rate based on Paris（P-da/dN-ΔK） in different probability can be obtained.And twice seven data fitting method was adopted to calculate crack propagation rate of each 7 CT samples of ADB610 steel in a series of same crack length.It was calculated for the crack propagation rate and the equation of crack propagation rate based on Paris of ADB610 steel with probability in 50%,90%,95%,99% and 99.9%.

关 键 词：存活率 裂纹扩展速率 两步七点拟合 ADB610钢 

分 类 号：TH125[机械工程—机械设计及理论] TG142[一般工业技术—材料科学与工程]