Abstract: Automotive lightweight is a key development direction in the automotive industry, with lightweight structural design, application of light materials, and promotion of new manufacturing processes serving as the main approaches to achieve this goal. Currently, low-density, highperformance materials have become the mainstream trend for automotive body applications, among which the popularity of aluminum alloy materials in the automotive sector will continue to rise. In the seat belt anchor point strength test that strictly follows the standard Safety-Belt Anchorages and Restraint Systems Anchorages for Occupants of Power-Driven Vehicles (GB/T 14167－2024), a pull-out failure of the connecting aluminum sleeve occurs, causing the test to fail. Analysis indicates that the root cause of the failure lies in the unreasonable design of the connection structure between the aluminum sleeve and the sheet metal: the sheet metal at the bottom of the two components fails to effectively share the load, ultimately leading to insufficient connection strength at the bottom. During the test, the standard parts are completely pulled out while the sheet metal connected to the bottom of the aluminum sleeve showed almost no deformation. Focusing on this failure and its underlying causes, this paper conducts in-depth research and proposes corresponding solutions, aiming to provide references for the design optimization and strength improvement of relevant components in aluminum alloy vehicle body.

Key words: aluminum alloy profile; anchorage point strength; connection method

摘要： 汽车轻量化是汽车行业的重要发展方向，而结构设计轻量化、轻质材料应用及新型制 造工艺推广是实现该目标的主要途径。当前，低密度、高性能材料成为车身用材的主流趋势， 其中铝合金材料在汽车领域的普及度将持续提高。在严格遵循标准《机动车乘员用安全带和 约束系统安装固定点》（GB/T 14167－2024）的座椅安全带固定点强度试验中，出现了连接铝 制套管拉脱失效的问题，导致试验未通。经过分析，失效原因在于铝制套管与钣金的连接结 构设计不合理，二者底部钣金未有效分担受力，最终造成底部连接强度不足，试验中铝制套 管完整脱出且铝制套管底部连接钣金基本无变形。文章针对该失效问题，围绕上述成因展开 研究，提出对应的问题解决方案，为铝合金车身相关部件的设计优化及强度提升提供参考。

关键词: 铝合金型材；固定点强度；连接方式