几种金属材料自冲铆接头的静态失效机理

利用自冲铆连接系统、材料试验机及扫描电子显微镜等设备来研究钛合金、铝锂合金及铝合金自冲铆接头的力学性能与静态失效机理。结果表明:TA1钛合金接头平均最大拉剪载荷(6 285.0 N)在3种接头中最大,8090铝锂合金接头(5 478.3 N)次之,5052铝合金接头(3 217.7 N)最小;不同金属材料自冲铆接头的静态失效模式有很大的区别,TA1钛合金接头出现铆钉从沿晶断裂向韧性断裂转变的失效过程,8090铝锂合金接头出现材料被擦伤与解理断裂的失效过程,5052铝合金接头仅出现材料被擦伤的失效过程。

Static Failure Mechanism of Several SPR Joints Made byDifferent Metal Materials

The mechanical properties and static failure mechanism of the titanium, aluminum lithium and aluminum
alloy self-piecing riveted joints were studied by the self-piecing riveting system, materials test machine and scanning
electron microscope. The results showed that the average maximum tensile shear load of the TA1 joints(6 285. 0
N) is the largest, the 8090 joints took the second place, the 5052 joints is the smallest. Different metal materials selfpiecing
riveted joints presented a great different static failure mode. The rivets in TA1 joints appeared a failure process
from intergranular fracture to ductile fracture. The 8090 joints appeared a failure process of the materials being rubbed
and cleavage fracture. The 5052 joints appeared a failure process of the materials only being rubbed.