Study on Clinched Joint in Similar and Dissimilar Sheets About Copper Alloy
Three types of clinched joints in similar and dissimilar sheets called H62-H62, H62-SPCC and SPCC-H62 respectively were studied by experiment. The tensile-shear tests were carried out to examine the mechanical behavior of them. It can be seen from the experiments that the neck thicknesses and interlocking lengths of H62-H62and H62-SPCC are both similar very much, but the interlock length of SPCC-H62 is insufficient. The tensile-shear strength is about 4000 N both for H62-H62 and H62-SPCC, and the failure mode are that the upper sheet fractures at the neck have a minimum thickness in the welded joint. The tensile-shear strength of SPCC-H62 is lower compared with the other two types of joints, and the failure modes include fracture of upper sheet at the neck with the minimum thickness and pulled-out of upper sheet resulting in upper sheet separation form bottom sheet. SPCC-H62 joint has bigger tensile-shear displacement and more energy absorption. The comparison results show that H62 sheet should be the upper sheet when joined with SPCC by clinch technology.