复杂载荷作用下压气机叶片疲劳寿命数值分析

为提高叶片服役寿命，在计算叶片应力分布并预测其在复杂载荷作用下的疲劳寿命后，基于逆向工程建立了三种不同精度的叶片模型;考虑离心和气动载荷作用，求解压气机叶片复合载荷作用下的应力分布规律;通过叶片模拟件疲劳试验，确定TC4钛合金疲劳极限，拟合寿命模型参数;利用非线性连续损伤力学模型预测叶片在典型工况下的疲劳寿命。结果表明：不同模型的应力及寿命计算值存在一定差异，开展叶片数值分析时，需考虑计算模型还原叶片几何特征的精度对计算结果的影响。

Numerical Analyses on Fatigue Life for Compressor Blades under Complex Loads

In order to improve service life of blades, three blade models were built based on reverse engineering to calculate stress distribution and fatigue life of blades under complex loadings. Considering the influence of centrifugal loads and aerodynamic loads, stress distributions of compressor blades were solved under complex loads. Moreover, the fatigue limit and life prediction model parameters were defined through the fatigue tests, and the fatigue life of compressor blades under the typical working conditions were predicted by nonlinear continuous damage model. Comparing the differences of stress values and fatigue life among three models, results show that the restoration degree of blade geometrical features for the calculation model must be considered when numerical calculations were carried out for blades with complex torsional characteristics.