汽轮机转子暂态温度场及弹塑性应力有限元分析及其应用

Finite Element Method and Application on Transient Temperature Field and Elasto-Plastic Stress Analysis for Steam Turbine Rotor

本文研究了有限元素法在热传导和应力分析中的具体应用。文中对时间域的离散、材料非线性特性、位移边界条件处理及大型线性代数方程组的求解等问题进行了全面的讨论。并指出汽轮机转子暂态温度场和弹塑性应力场的求解特点和有限元程序编制的主要步骤。文中对200MW机组中压转子前轴封弹性槽的热应力集中系数和弹塑性应变集中系数进行了计算,并归纳出弹塑性应变集中系数与热应力集中系数、公称等价应力和材料性能参数的关系式。

The application of finite element method in heat conduction and stress analysis is studied in this paper. The paper discusses some problems including time domain division, non-liner elasticity,displacemnt boundary condition treatment and etc.,which point out solution characteristics of transient temperature and elasto-plastic stress field and major steps of the finite element method program for steam turbine rotor.Elasto-plastic,.strain concentration factor against thermal stress concentration factor and nominal equivalent stress as well as material performance parameters is summarized into formula by calculation of thermal stress concentration factor and elasto-plastic strain concentration factor of elasto notch for IP rotor of 200MW.