关键词: 涡轮叶片, 静强度分析, 弹塑性有限元分析, 配合间隙, 低循环疲劳, 寿命预测

Abstract: Develops a full-size finite element model of turbine blades at low-pressure stage. According to the test-rig used and actual working load, an elasto-plastic finite element analysis was made using the software ANSYS with the loads due to centrifugal force and airflow pressure to operating blades taken into account. The effect of fit clearance between hoping strips and blades orifices on the stress distribution on blade was explored. It was found that the weak points of the static blade strength are the first throat section of blade tenon, the blade orifices and the side round root of blade back. Then, a high-temperature low-cycle fatigue life was predicted for the turbine blades. The results showed that the maximum fit clearance between hoping strips and blade orifices affects greatly the static strength and fatigue life of blades, and the mean fit clearance should be taken into consideration when calculating fatigue life. In addition, the calculated fatigue life of blades lowers greatly with the increasing temperature.