基于线性匹配法(LMM)的承压部件安定棘轮分析与评定  

Shakedown and Ratcheting Analysis and Assessment for Pressure Components Based on Linear Matching Method( LMM)

作　　者：沈鋆[1] 彭恒 陈浩峰 刘应华[1] SHEN Jun;PENG Heng;CHEN Hao - feng;LIU Ying - hua(Department of Engineering Mechanics,Tsinghua University,Beijing 100084,China;Department of Mechanical ＆ Aerospace Engineering,University of Strathclyde,Glasgow,G1 1X J,UK)

机构地区：[1]清华大学工程力学系,北京100084 [2]思克莱德大学机械与航空系

出　　处：《压力容器》2018年第6期24-30,共7页Pressure Vessel Technology

基　　金：国家重点研发计划项目(2017YFF0210704;2016YFC0801905)

摘　　要：ASMEⅧ-2规范中针对棘轮失效提供了3种方法,而这些方法在适用性和便捷性等方面有各自的局限性,不能广泛且快速地应用于工程实际。线性匹配法(LMM)是一种求解非线性材料结构响应的快速直接算法,可适用于任意的几何结构和任意的热-机载荷组合。以压力容器中最常见的带径向接管的筒体为例,运用LMM快速地确定了承压部件的安定和棘轮边界,并给出了详细的步骤,得出了可供工程设计参考的相关结论。Three evaluation procedures for thermal stress ratcheting were provided in ASME Ⅷ -2. How- ever, these methods have their own limitations in the applicability and convenience, and consequently can- not be applied to practical engineering widely and rapidly. The linear matching method （LMM） is a fast direct method to solve the structural response of nonlinear materials, which can be applied to arbitrary ge- ometry and arbitrary thermal-mechanical load combinations. By taking a shell with a radial nozzle most common in pressure vessels as an example, the shakedown and ratchet boundaries were established quick- ly for components subjected to arbitrary combinations of thermal-mechanical loads using LMM and de- tailed steps were given. The relevant conclusions obtained can provide reference for engineering design.

关 键 词：热应力棘轮 分析设计 线性匹配法 棘轮边界 安定边界 

分 类 号：TH49[机械工程—机械制造及自动化] O343[理学—固体力学]