后轴安装支架开裂分析与优化

Analysis and Improvement of Strength for Bracket of Rear Axle

某QX车型在强化路试验证里程达7200km时,车身后轴安装支架出现撕裂,车身拖曳臂安装支架出现撕裂现象,严重影响产品的质量和安全。通过计算机仿真分析对比试验结果,复原发生撕裂的原因,结果表明支架在制动和转弯工况下其强度存在较大风险,最大应力为518.6MPa,撕裂部位发生在支架本体根部,这与整车道路试验结果吻合。确认有限元分析模型的准确性,进而整改设计支架结构,重新计算分析强度,最终完全解决了后轴安装支架开裂问题,使得方案最终选定,直至样车通过验证、验收。

When a QX vehicle was running in a road test about 7000km for reliability, a bracket which was mounted on trailing arm appeared tearing. It had seriously effect on the product quality and safety. Compared results computer simulation and test, the reason of tear was found, and the Finite Element Model was reliable and efficient. The result has shown that the bracket strength was insufficient when it worked in wheeling and breaking, and the tearing position and magnitude （518.6 Mpa） of maximum stress were consistent with road test. The bracket was redesigned , recalculated and reanalyzed , and the problem of bracket tearing was fully solved. Then the scheme was selected , at last, the new vehicle passed the validation of reliability testing.