定向结晶叶片在多种失效模型下的应力分析及比较

Stress Analysis of Directional Solidification Blade Using Multiple Failure Models

近年来,随着燃气轮机透平入口温度越来越高以提高机组热效率,单晶(SC)和定向结晶(DS)叶片已广泛使用。在对定向结晶和单晶叶片进行应力计算和安全性评估时,有必要考虑其材料的各向异性。本文先对定向结晶叶片材料的弹性本构做了详细介绍,并结合实际叶片,比较了其在3种常见失效模型(最大主应力失效模型,Von Mises屈服模型,Hill屈服模型)下的等效应力计算结果。

recently,single crystal(SC)and directional solidification(DS)blades have been widely used as the turbine inlet temperature becomes higher and higher to improve the unit thermal efficiency.The material’s anisotropy should be taken into account in stress calculation and safety assessment of SC and DS blades.This paper introduced the elastic constitutive law of DS blade material in detail,and then compares its stress calculation results under three common failure models(maximum principal stress failure model,Von Mises yield model,Hill yield model)base on actual blade.