基于Z参数和可靠度的蠕变损伤模型  

Creep damage model based on Z-parameter and confidence level

作　　者：赵杰[1] 邢丽[1] 马海涛[1] 冯炜[1] 

机构地区：[1]大连理工大学材料科学与工程学院,辽宁大连116024

出　　处：《大连理工大学学报》2008年第6期825-829,共5页Journal of Dalian University of Technology

基　　金：国家"八六三"计划资助项目(2006AA04Z421)

摘　　要：基于Z参数和可靠性评估研究了蠕变损伤,提出利用Robinson法则评估的蠕变损伤与可靠度密切相关.对5Cr-0.5Mo和HK40两种材料蠕变断裂数据的分析表明:由于蠕变数据的偏差可用Z参数来表征,且Z参数服从正态分布,可以把可靠度和蠕变损伤关联起来.给出了两种材料在不同可靠度下的损伤程度,并与实际服役管段的数据进行了比较.结果表明,在一定温度和应力下,可靠度越大,蠕变损伤积累值也就越大.而且,不同服役时间的实验数据点和预测的损伤积累线吻合较好.The creep damage method has been investigated based on the Z-parameter and the reliability evaluation, and the damage evolution estimated by the Robinson＇s rule is presented to be correlated to the confidence level. From the investigation of 5Cr-0.5Mo and HK40 NRIM data, it is shown that a normal distribution is supported for the value of the Z-parameter which can reflect the deviation of creep rupture data, and therefore, the damage can be in connection with the confidence level. The damage evolution of these two steels at different confidence levels in contrast with that of removed tubes at different time is presented. At a certain stress and temperature, the higher the confidence level, the more the damage accumulation. In addition, the data points based on the experimental data of removed tubes at different time are in good agreement with the damage accumulation lines.

关 键 词：蠕变损伤 Z参数 Robinson法则 可靠度 Larson-Miller法 

分 类 号：TG111[金属学及工艺—物理冶金] TP202[金属学及工艺—金属学]