異種材継手の作製と継手強度の検討

抄録

In the punching rivet method, punching and joining of two sheets can be carried out at the same time, so it is not necessary drilling in advance. Out-of-plane deformation of a joint is also small. This method is carried out by using a rivet and a rivet holder. In this study, the punching rivet method was applied to joining of a CFRP sheet and an aluminium alloy sheet, and a dissimilar joint was made. A cross-section of the joints was observed to examine the fastening condition. In addition, tensile test was carried out for the rivet joints and the bolted joints, and the joint strength of each joints was compared. From experimental results, it was possible to join the CFRP sheet and the aluminium alloy sheet by the punching rivet method. The joints fractured from the CFRP sheet side in tensile testing. A type of fracture was the bearing fracture. The joint strength increased by lengthening the rivet shaft, but it was lower than the strength of the bolted joint. Furthermore, the joint was fastened by plastic deformation of the rivet shaft, and the delamination was observed in the CFRP sheet around the rivet shaft. This damage may cause reduction in the joint strength. Therefore, it is necessary to examine the measures for suppressing the delamination.