基于四参数棘轮理论的压力容器安定分析  

Shakedown analysis of pressure vessels based on the four-parameter ratcheting theory

作　　者：鲍宏琛 沈鋆[1] 刘应华[1] BAO Hongchen;SHEN Jun;LIU Yinghua(School of Aerospace Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学航天航空学院,北京100084

出　　处：《压力容器》2021年第11期36-43,共8页Pressure Vessel Technology

基　　金：国家重点研发计划项目(2017YFF0210704);国家自然科学基金项目(11672147)。

摘　　要：对于压力容器和管道系统等工业部件,确定结构在复杂循环热机械载荷下的安定域,从而避免低周疲劳和增量塑性变形是至关重要的。基于线性匹配方法下的严格安定分析,应用一种新颖的双平面模型,考虑机械薄膜应力、热薄膜应力、热弯曲应力之间的相互作用,分别给出结构在三类载荷工况下的三维安定域。通过引入一个新的参数二次膜弯比,基于四参数棘轮理论,首次给出了三类工况下安定边界的参数公式,可为工程设计和安全评定提供参考。For industrial components such as pressure vessels and piping systems,it is very important to determine the shakedown domains of structures under complex variable thermo-mechanical loads so as to avoid low cycle fatigue and incremental plastic deformation.Based on the strict shakedown analysis of the linear matching method,a novel two-plane model was used to consider the interaction among mechanical membrane stress,thermal membrane stress and thermal bending stress,and the three-dimensional shakedown regions of the structure under three loading cases were given.By introducing a new parameter called secondary membrane bending ratio,the parametric equations of the three types of shakedown boundaries were obtained for the first time based on the four-parameter ratcheting theory,which can provide a reference for engineering design and safety assessment.

关 键 词：安定分析 压力容器 线性匹配法 双平面模型 循环载荷 

分 类 号：TH49[机械工程—机械制造及自动化] O344.3[理学—固体力学]