1420铝锂合金自冲铆连接工艺及静态失效机理

Self-piercing Riveting Process and Static Failure Mechanism of 1420 Aluminum-Lithium Alloy

采用两种规格铆钉对1420铝锂合金板的自冲铆接过程进行了数值模拟,并对模拟结果进行了验证。基于拉伸-剪切试验研究了两种铆钉接头的静力学性能和失效模式,并利用扫描电子显微镜对试件进行微观失效分析。结果表明:试验结果与模拟结果具有良好的一致性。大规格铆钉接头的静力学性能明显优于小规格铆钉的自冲铆接头。两种接头的失效模式均为下板与铆钉分离;大规格铆钉的接头上板出现严重撕裂,属于韧性断裂。

The self piereing riveting （SPR） process of 1420 aluminum-lithium alloy sheets was numerically simulated by using two kinds of rivets. And the simulation results were verified. Based on the tensile-shearing tests, the static performance and failure mode of two kinds of rivet joints were studied. Micro-failure of specimens was analyzed by using scanning electron microscope. The results show that the experimental results are in good agreement with the simulation results. The mechanical performance of large-sized rivet joints is obviously better than that of small-sized rivet joints. Failure mode of two kinds of joints is the separation of lower plate and rivet; the upper sheet of large-sized rivet joint is severe laceration, which belongs to ductile fyacture.