FAILURE ANALYSIS OF GAS TURBINE BLADE USING FINITE ELEMENT ANALYSIS

This paper presents the failure analysis of the turbine blade of a gas turbine engine 9E GE type, installed in a certain type of simple systems consisting of the gas turbine driving an electrical power generator. A non-linear finite element method was utilized to determine the stress state of the blade segment under operating conditions. High stress zones were found at the region of the lower fir-tree slot, where the failure occurred. A computation was also performed with excessive rotational speed. Attention of this study is devoted to the mechanisms of damage of the turbine blade and also the critical high stress areas.

本论文针对某型由燃气轮机驱动发电机组成的简易系统中安装的GE 9E型燃气轮机涡轮叶片开展失效分析研究。本研究采用非线性有限元法（non-linear finite element method），对运行工况下的叶片段应力状态进行求解。研究发现，在发生失效的下侧枞树型榫槽（fir-tree slot）区域存在高应力集中区。此外，本研究还针对超速旋转工况开展了仿真计算。本研究的核心关注点为涡轮叶片的损伤失效机理及其临界高应力区域。