基于薄壳式模型的圆环式膨胀节变形分析

Deformation Analysis of Torus Type Expansion Joint Based on Thin Shell Model

对圆环式膨胀节建立轴对称薄壳模型,列出薄壳弹塑性变形下的典型方程,根据假设圆环式两端固结的边界条件和循环疲劳的工作环境及材料折线硬化的实际情况,利用计算机对典型方程进行逐次积分,求得符合精度要求的逼近解,得出与实验结果极为接近的结论,即无量纲关系μ(ε)对薄壳的几何参数和壳两端位移的比率没有多大关系。

This paper constructed axisymmetric thin shell model of torus type expansion joint,listed canonical equation of thin shell plastoelastic deformation.According to consolidated boundary conditions of torus type two terminals and working condition of cyclic fatigue and practical situation of material flexural rigidity,through successive integration for canonical equation with computer,the optimal approximation solution with accuracy requirement is got.The conclusion is almost exactly the experimental result,that is dimensionless relation has little influence on geometric parameter of thin shell and displacement ratio of two terminals of shell.