基于铺覆模拟的复合材料螺旋桨叶片实体有限元建模分析

为了评估复合材料螺旋桨叶片在铺覆时纤维取向改变对性能的影响,基于Fibersim软件的铺覆模拟结果建立了复合材料螺旋桨叶片的实体有限元模型,并与不考虑纤维取向改变时的有限元计算结果进行对比。结果表明:不考虑纤维取向改变时叶片固有频率及均布压力下最大位移误差小于5%,但热载荷下考虑真实纤维方向时的最大变形量约为不考虑真实纤维方向时的2倍,叶片局部区域0°、45°、-45°方向铺层的纤维角度偏差超过了25°。在进行复合材料螺旋桨叶片有限元分析时应基于铺覆后的真实纤维方向。

Solid Finite Elements Modeling of Composite Propeller Blade Based on Draping Simulation

In order to evaluate the effect of fiber direction deviation on the performance of composite propeller blades,a solid finite elements model was established based on the results of the draping simulation with Fibersim software.The FEM analysis results considering fiber direction deviation was compared with the results ignoring fiber direction deviation.The results show that the errors of natural frequencies and maximum deformation under uniformly distributed pressure are less than 5% while ignoring fiber direction deviation.But the maximum deformation under distributed temperature field of considering fiber direction deviation is about 2 times of that of ignoring it.Fiber direction deviations of the 0°,45°,and -45° plies exceed 25° in partial area of the blade.The FEM analysis of composite propeller blades should be based on the true fiber direction after draping.