基于ANSYS的二维发动机风扇盘结构应力分析方法研究

Stress analytical method research of 2D engine fan disk structure based on ANSYS

为了提高发动机风扇盘二维有限元模型应力分布的精确度,选择典型的三辐板结构,利用ANSYS 12.0完成三辐板风扇盘三维结构的有限元建模.同时建立三辐板风扇盘的二维轴对称有限元模型,将非轴对称载荷分解成傅里叶级数,并求解了其径向应力、周向应力和等效应力,对比了传统的二维分析、非轴对称加载二维与三维分析的结果.结果表明:施加均布载荷的二维模型应力分布与三维模型的应力分布情况相差较远,施加非轴对称载荷的二维模型的应力分布与三维模型的应力分布情况较为接近.与只施加均布载荷的方法相比,本方法提高了发动机风扇盘二维有限元模型应力分布的准确性.

Typical three-wheel disk structure was chosen in order to improve the accuracy of the stress dis-tribution of 2D finite element model of the engine fan disk.Three-wheel fan disk structure of 3D finite ele-ment modeling was completed by using ANSYS 12.0.And the three-wheel fan disk of 2D axisymmetric fi-nite element model was established.The non axisymmetric load was decomposed into Fourier series.Solu-tion of radial stress,circumferential stress and equivalent stress was done subsequently.Compared with typ-ical 2D analysis load,2D non axisymmetric load and 3D analysis load show that the stress distribution of 2D model applying the uniform load is far away from the stress distribution of 3D model,and the stress dis-tribution of 2D model applying the non axisymmetric load was close to the stress distribution of 3D model. Compared with applying the uniform load,this method can improve the accuracy of the stress distribution of 2D finite element model of the engine fan disk.