摘要
应力分类方法目前仍是进行压力容器、压力管道分析设计所使用的主要方法。由于该方法基于板壳理论和线弹性分析的特点,多年来的工程实践表明,应力分类方法在适用范围、强度条件和结果的安全性等方面均有其局限性。根据应力分类方法的来源,指出在工程应用中其关于一次局部薄膜应力以及弯曲应力的强度条件具有不确定性,同时,该方法也不能反映应变集中现象。对应力分类方法的这些局限性进行了讨论,说明该方法试图用线弹性分析方法解决弹塑性失效问题是产生这些局限性的根本原因。
Currently, stress categorization method is still main method used in analytical design of pressure vessel and piping. In view of the fact that this method is based on plate and shell theory and elastic analysis, in engineering application, there are some limits for this method on applicable scope, strength requirements and safety in analysis results. Based on the origin of stress categorization method, it was indicated in this paper that in its application in engineering, there are uncertainties in the strength requirements for local primary membrane stress and bending stress. At the same times, the phenomena of elastic follow-up can not be revealed in this method. In this paper, these limits in using this method were discussed, and it was explained that the source to produce these limits is that elastic analysis is used in this method for solving elasto-plastic failure problems.
出处
《化工设备与管道》
CAS
2013年第2期1-7,共7页
Process Equipment & Piping
基金
科技部科技型中小企业技术创新基金项目(09C26213100778)
关键词
应力分类
适用范围
强度条件
弹性跟随现象
一次局部薄膜应力
弯曲应力
stress categorization
applicable scope
strength requirement
elastic follow-up phenomena
local primary membrane stress
bending stress
