关键词: 铝合金型材；固定点强度；连接方式

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