Abstract: In response to the cracking problem found in a subframe during vehicle testing, this paper uses the computer aided engineering (CAE) simulation analysis method to establish a fatigue simulation analysis model. Combining faulty parts' fracture analysis, dimensional inspection of the actual parts, and bench test reproduction, the paper conducts a cause analysis to find the design and process-related causes of the cracking. Based on the failure reasons, the paper proposes targeted structural and process optimization solutions. Using the fatigue simulation analysis model, the paper verifies the optimization solutions theoretically. At the same time, the paper conducts physical verification tests using a test rig and road tests. The successful verification of the theoretical and physical tests proves the effectiveness of the optimization solutions, providing a reference for solving similar problems in automotive subframes.

Key words: subframe; CAE simulation; vehicle test; fatigue simulation; structural optimization

摘要： 针对某副车架在整车试验中出现的开裂问题，文章基于计算机辅助工程（CAE）仿真 分析方法，建立疲劳仿真分析模型，并结合故障件的断口分析、实物的尺寸检验以及台架试 验复现进行原因分析，找到开裂发生的设计和工艺上的原因。根据失效原因，文章提出了针 对性的结构优化及工艺优化方案。利用疲劳仿真分析模型，对优化解决方案进行理论验证。 同时利用台架试验以及道路试验对解决方案进行实物验证。理论验证以及实物验证的通过， 证明了优化解决方案的有效性，为解决汽车副车架类似问题提供参考。

关键词: 副车架；CAE 仿真；整车试验；疲劳仿真；结构优化