蠕变断裂寿命外推方法及数据分散性处理研究  

Study on Extrapolation Methods of Creep Rupture Life and Processing of Data Scattering

作　　者：张效成[1] 宫建国[1] 轩福贞[1] ZHANG Xiao - cheng GONG Jian - guo XUAN Fu - zhen(Key Laboratory of Pressure Systems and Safety, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, Chin)

机构地区：[1]华东理工大学机械与动力工程学院承压系统与安全教育部重点实验室,上海200237

出　　处：《压力容器》2017年第7期11-18,共8页Pressure Vessel Technology

基　　金：国家自然科学基金资助项目(51475167;51325504)

摘　　要：高温部件的蠕变寿命外推问题是高温结构完整性领域的重要课题。主要归纳了蠕变断裂寿命的外推方法,介绍以Larson-Miller参数法为代表的长时持久寿命外推方法;同时,给出其他常用寿命外推方法;最后,介绍蠕变断裂寿命外推过程中数据分散性的处理方法。结果表明,使用Larson-Miller法外推耐热钢长时持久寿命时存在过高估计倾向,利用分区分析方法可显著改善外推结果。蠕变断裂数据不可避免存在分散性,可以从试验方法、数据选择和常数优化等方面减小数据分散,此外引入Z参数,在一定可靠度下进行寿命预测。The extrapolation of the creep rupture life is an important issue of high temperature structure integrity. Extrapolation of creep rupture life methods represented by Larson-Miller parameter（LMP） method is summarized, and the processing methods of creep rupture data scattering is introduced. Results indicate that creep rupture life of heat-resistant steel is usually overestimated by the LMP method, while multiregion analysis could improve extrapolation results ; data scattering could be reduced in the aspects of experimental method, data selection and constant optimization. In addition, creep rupture life can be predicted using the Z parameter with the reliability included.

关 键 词：寿命外推 Larson-Miller参数法 数据分散性 蠕变 

分 类 号：TH49[机械工程—机械制造及自动化] O346.1[理学—固体力学]