基于强度理论的扭力梁支架失效有限元分析及优化

为解决纯电动汽车扭力梁支架在道路试验中发生开裂的问题，运用有限元软件建立车身结构的有限元模型，通过整车多体动力学分析提取典型工况的载荷作为其载荷输入，基于强度理论，采用惯性释放原理对支架进行强度分析，结果表明:支架强度存在较大风险，风险位置与整车道路试验开裂位置基本吻合。针对危险位置提出优化方案，提高支架结构强度。通过提高支架的强度和传递支架的载荷，能够有效改善支架结构的应力分布。跟踪路试耐久试验，验证方案的可行性。通过利用CAE分析技术在产品开发过程中的应用，有效找到问题原因并有针对性地加以优化，从而缩短开发周期和节约成本。

Failure Analysis and Structure Optimization of Torsion Beam Support Based on Strength Theory

In order to solve the cracking problem of the torsion beam supportof a pure electric vehicleduringthe road test, a finite element model forelectric body structure was established by using finite element software. The load under typical working condition was extractedas its load input through multi-body dynamic analysis. Based on the strength theory, the inertia release principle was used to analyze the strength of the support. The analysis results show that the strength of the support has large risk of cracking, and the dangerous position is similar to the cracking position during the road test. In order to improve the strength of the support structure, an optimization scheme was put forward for the dangerous position. By increasing the strength of the support and transferring the load of the support, the stress distribution of the support structure can be effectively improved. Tracking the road test, the feasibility of the scheme was verified. Through the application of CAE analysis technology in the product development process, the cause of the problem can be found effectively and optimized in target, and thus the development cyclecan be shortened and costscan be saved.