短粗波纹管伸缩接头以薄壳式模型的变形分析

The Distortion Analysis about the Shell Model of Short and Thick Bellows Expansion Joints

对短粗类波纹管伸缩接头(L/D<5),建立轴对称薄壳模型,列出薄壳弹塑性变形下的典型方程,根据假设波纹管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u軈(ε軈)对薄壳的几何参数和壳两端位移的比率没有多大关系.

Axis symmetrical shell model was established to the short and thick bellows expansion joint （L/D〈5）in this paper and the shell typical equation under elastic deflection or plastic deformation was also listed. According to the assumed boundary conditions of the bellows both ends, the working environment of cyclic fatigue and the actual situations of the materials of its broken line hardening, approximating solution could be obtained by successive integral solution to the mentioned typical equation in line with requirement of the accuracy through the computer. The conclusion closed to the experimental results could also be got, that was non-dimensional relationship u^-（ε^-） had little to do with the geometric parameters of the shell and the ratio of displacement of its both ends.