基于Hypermesh的汽车驱动桥壳有限元分析与疲劳寿命预测

Finite element analysis and prediction on fatigue life of drive axle housing based on hypermesh

驱动桥壳是汽车中的重要部件,应具有足够的强度、刚度以及疲劳寿命。基于CAD/CAE一体化技术,首先利用CATIA软件建立了某轻型汽车驱动桥壳的三维实体模型,虚拟装配后,导入Hy-permesh中建立以3D实体单元为基本单元的有限元模型,并以MSC.Nastran为求解器,通过模拟相关行业标准规定的台架试验及典型工况,得出驱动桥壳强度与刚度满足要求;最后,通过建立驱动桥壳S-N曲线,将有限元结果导入MSC.Fatigue进行模拟台架疲劳试验,得到桥壳整体的疲劳寿命分布,结果表明驱动桥壳疲劳寿命满足要求,验证了设计的合理性。

The drive axle housing,as an important component in a vehicle,should have sufficient strength,stiffness and enough fatigue life.Based on CAD/CAE integration technology,a 3D solid model of the drive axle housing for a light truck is built using software CATIA first.After the virtual assembly,mport it in Hypermesh to build a FEA model of drive axle housing by taking 3D solid units as basic units.Based on the model,the bench test according to the national standards and the typical conditions are simulated with the MSC.Nastran as the solver,which results indicate that the drive axle housing strength and stiffness satisfy the design requests;At last,import the finite element analysis results into the software MSC.Fatigue,and the fatigue bench test is simulated through establishing the drive axle housing S-N curve,thus the fatigue life distribution of the whole axle housing is obtained.The results indicate that the drive axle housing fatigue life satisfies the design requests,which verify the reasonability of the design.