U型波纹管及相关结构环向屈曲的有限元分析(Ⅲ)——波纹管平面失稳的机理  

Analysis of Circumferential Buckling of U-Shaped Bellows and Related Structures Part Ⅲ: Mechanism of In-Plane Squirm of Bellows

作　　者：朱卫平[1] 

机构地区：[1]上海大学上海市应用数学和力学研究所,上海200072

出　　处：《应用力学学报》2003年第2期152-154,共3页Chinese Journal of Applied Mechanics

摘　　要：波纹管无论是在内压还是在外压作用下都会发生环向屈曲或平面失稳 ,问题很复杂至今未得到妥善解决。本文首先指出了现行的有关“塑性铰”概念的某些不足之处 ,然后按文 [8]的有限元法 (考虑了屈曲前的弯曲和屈曲时载荷的转动并按线性化特征值问题处理 )对波纹管的环向屈曲进行了计算 ,并与前人的有关实验进行了对比分析 。Circumferential buckling or called in plane squirm of bellows may take place whether it is subjected to external pressure or internal pressure. The problem is too complex to have been properly solved yet. In this paper, firstly the shortcomings of the usual 'plastic hinges' model are revealed. Then the finite element method of Part 1 (treated as a linearized eigenvalue problem but the finite prebuckling rotations and the follower force effect of the pressure are considered) is used to calculate the circumferential buckling of bellows and the results obtained are compared with the vailable experimental ones. After that some new explanations about the in plane squirm are proposed.

关 键 词：U型波纹管 环向屈曲 有限元分析 平面失稳 临界载荷 屈曲模态 

分 类 号：TH703.2[机械工程—仪器科学与技术] O344[机械工程—精密仪器及机械]