Al合金/CFRP摩擦重ね点接合継手の引張せん断強度特性におよぼす接合条件の影響

抄録

The aim of this study is to investigate effect of plunging depth of welding tool on tensile shear strength of Al alloy/ CFRP friction lap spot joint. In this study, thermoplastic sheet was set between Al alloy and CFRP in order to join carbon fiber reinforced thermoset to Al alloy. In welding process, frictional heat is generated by contact between rotating welding tool and Al alloy. Generated heat is transferred from Al alloy to thermoplastic sheet. The thermoplastic sheet is melted and bonded to both Al alloy and CFRP. From results of tensile shear test and observation of welding part, in case of shallow plunging depth of welding tool, generated heat was not sufficient to form welding part. On the other hand, in case of more deeper plunging depth of welding than thickness of thermoplastic sheet, Al alloy was directly contacted to CFRP, as a result, decrease in welding area and tensile shear strength was induced. From result of measurement of axial load applied to the welding tool during the process, It is considered that higher axial load was generated to higher interfacial strength of CFRP/thermoplastic sheet and also tensile shear strength of Al alloy/ CFRP friction lap spot joint.