某转向直拉杆臂失效分析  

Failure Analysis of a Steering Drag Link Arm

作　　者：代天才 冯喜成 孔文 黄运强 

机构地区：[1]东风德纳车桥有限公司产品研发中心,湖北襄阳441057

出　　处：《汽车零部件》2015年第10期33-36,共4页Automobile Parts

摘　　要：运用有限元软件MSC.Nastran,对某商用车前桥所用转向直拉杆臂进行模拟分析,分析结果中转向直拉杆臂应力极值点和客户使用过程失效模式有一定差异;接着利用非线性有限元软件MSC.Marc,采用接触方案,对该转向直拉杆臂重新进行分析,计算结果的应力极值点和客户失效部位吻合。为了验证后者方案的正确性,对该转向直拉杆臂进一步进行台架试验,该臂台架失效部位和分析结果应力最大部位一致,再次验证了非线性方法的正确性。进而通过该方法来分析此类臂零件,降低产品整体应力水平,提升产品可靠性。By using the finite element analysis software MSC. Nastran,a steering drag link arm mounted on a front axle of a truck was analyzed,to simulate it on service conditions. The results showed that the extreme stress point on the steering drag link arm was not the same to the destroyed one used by truck customers,it mean the failure mode was inconsistent to the customers＇. Then it was analyzed again,adopting the contact approach,by using another finite element analysis software MSC. Marc,which was a nonlinear software. The maximum stress point coincided with the destroyed one this time. To verify the second scenario correctness,the steering drag link arm was tested latter. The destroyed section in test coincided with the maximum stress point in simulation. It proved the correctness of the nonlinear approach. Following,the approach was used to analyze such arm parts,the stress level of products was reduced and products reliability was improved.

关 键 词：有限元分析 非线性 失效模式 直拉杆臂 

分 类 号：U463.2[机械工程—车辆工程]