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Fracture behaviors and optimizations of friction stir spot welded and friction stir clinched hybrid aluminum/acrylonitrile butadiene styrene joints

Journal: Research on Engineering Structures and Materials (Vol.8, No. 2)

Publication Date:

Authors : ;

Page : 205-222

Keywords : Friction stir spot welding; Friction stir clinching; Aluminum alloy; Acrylonitrile butadiene styrene polymer; Fracture; Mechanical properties; Microstructure;

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Abstract

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.

Last modified: 2022-06-27 00:34:32