摘要
基于弹-塑性应力分析和当量应变的压力容器疲劳评定方法是新版ASMEⅧ-2提供的三种疲劳评定方法之一。在用有限元法实施时,规范提供了两条途径:逐一分析法和两倍屈服法。介绍了基于弹-塑性应力分析疲劳评定方法的基本原理,讨论了逐一分析法和两倍屈服法之间的区别联系、优势局限及对有限元分析软件的不同要求,并简述多轴应力应变条件下如何获得用于疲劳分析的交变当量应力。
The method based on elastoplastic analysis and equivalent strain is one of three fatigue assessment methods provided in new version of ASME VIII-2. When it is carried out by using finite element method, there are two routes presented in the code： cycle- by-cycle method and twice-yield method. In this paper, fundamental principle of fatigue assessment method based on elastoplastic analysis was introduced. Then, the difference and connection between cycle-by-cycle method and twice-yield method, the advantages and limitations of two methods and different requirements for finite element analysis software were discussed. At the same times, the method of acquiring cyclic equivalent stress under multi-axial stress condition was depicted.
出处
《化工设备与管道》
CAS
2013年第1期16-19,45,共5页
Process Equipment & Piping
基金
BASF重庆MDI项目(11015)
