Fracture behaviors and optimizations of friction stir spot welded and friction stir clinched hybrid aluminum/acrylonitrile butadiene styrene joints
Michael Kanisuru Adeyeri1, Olatunji Oladimeji Ojo1, Adefemi Oluseye Adelusi2,
1Department of Industrial and Production Engineering, Federal University of Technology Akure, Nigeria
2Department of Mechanical Engineering, Federal University of Technology Akure, Nigeria
Friction stir spot welding;
Friction stir clinching;
Acrylonitrile butadiene styrene polymer;
This study compares and optimizes the friction stir clinched and friction stir spot welded hybrid aluminum/acrylonitrile butadiene styrene polymer (Al/ABS) joints. The mechanical and fracture behaviors of the respective hybrid joints were investigated. The results show that the friction stir spot welded Al/ABS joint exhibited a higher tensile-shear failure load. The presence of higher deformation (protrusion-aided) and deeper tool profile-induced hole (stress raiser) in the friction stir clinched Al/ABS joint impaired the loadbearing resistance of the joint. The optimum tensile-shear failure loads of the friction stir spot welded, and friction stir clinched Al/ABS joints are 932 and 509 N respectively. Three fracture modes, namely unbuttoning, circumferential-partial Al in-polymer shearing, and mid-nugget shearing modes, ensue in both joint categories. Protrusion-aided deformation is not desirable for the improved performance of the hybrid Al/ABS joint. Friction stir spot welding is thus recommended for the fabrication of hybrid metal/polymer.
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