Effect of jig constraint state during welding process on fatigue properties of Al/CFRP dissimilar welds and fatigue life evaluation based on singular stress

Abstract

Manufacturers have been promoting multimaterial designs. So the dissimilar material welding methods are being developed. Especially, heat welding technology, which is a direct joining by local heating, has been focussed. Therefore, this study used a heat welding technology for friction stir spot welding of aluminium alloy and carbon fibre‐reinforced plastic. This study investigated the effect of changes to jig constraint of joined members on the fatigue properties of joints. Also, the fatigue life estimation was carried out by considering the singular stress at the welding joint interface. As a result, the fatigue strength of joint in a less constrained state is higher than that in a more constrained state. The singular stress intensity at the slit tip was uniformly predicted by the differences in welding parameters of joints.

Directly bonded single lap joints of SiCp/AA2124 composite with glass fiber-reinforced polypropylene: Hole drilling effects on lap shear strength and out-of-plane impact response

“…[45][46][47] Welding techniques are also used for the dissimilar assemblies. [48][49][50] Compared to these conventional methods, direct bonding has been considered as an effective way to manufacture metal/polymer structures. [51][52][53] Among direct joining methods, hot pressing has emerged as an outstanding alternative.…”

Fatigue and fracture of ultrasonically welded aluminum alloys to carbon fiber reinforced thermoplastics

“…In addition, current research has shown experimental setups for the very high cycle regime (VHCF) by use of selected composite systems 25 or functional hybrid materials in the purpose of structural health monitoring (SHM) 26 . Fatigue properties of hybrid aluminum/CFRP joints have been investigated in recent research as an alternative to the riveting process such as electromagnetic riveting 27 or the use of self piercing rivets 28 as well as friction stir spot welding 29 . Experimental investigations of the fatigue properties of ultrasonically welded aluminum/FRP joints are lacking to a large extent in the literature.…”

“…26 Fatigue properties of hybrid aluminum/CFRP joints have been investigated in recent research as an alternative to the riveting process such as electromagnetic riveting 27 or the use of self piercing rivets 28 as well as friction stir spot welding. 29 Experimental investigations of the fatigue properties of ultrasonically welded aluminum/FRP joints are lacking to a large extent in the literature.…”