Friction Stir Spot Welding of PLA-PEKK-HAp-CS Based 3D Printed Scaffolds for Minor Repair

CSME 2020/10
Volume 41 No.5 : 639-646

Friction Stir Spot Welding of PLA-PEKK-HAp-CS Based 3D Printed Scaffolds for Minor Repair

Rupinder Singh ^a, Jaskarn Singh , Gurchetan Singh and Ranvijay Kumar ^b
^aDepartment of Production Engineering, Guru Nanak Dev Engineering College, Ludhiana (India) / Department of Mechanical Engineering, NITTTR, Chandigarh (India)
^bDepartment of Production Engineering, Guru Nanak Dev Engineering College, Ludhiana (India) / University Center for Research and Development, Chandigarh University, Mohali (India)

Abstract: The 3D printed thermoplastic composites of polylactic acid (PLA) are commercially used as biomedical scaffolds/ implants in tissue engineering applications. But hitherto limited studies have been reported on use of joining techniques in repair of 3D printed biomedical scaffolds. In this study, functional prototypes of PLA reinforced with poly ether ketone ketone (PEKK)- hydroxyapatite (HAp)- chitosan (CS) were 3D printed as scaffolds with fused deposition modelling (FDM), followed by their joining with friction stir spot wielding (FSSW) as a novel route. The scaffold joint were investigated for mechanical and morphological properties for possible online repair of minor surface defects. The outcomes of this case study suggest that 1000rpm rotational speed, 2mm consumable pin depth and 20 sec stirring time are best settings for strength and surface hardness of the 3D printed scaffold joints.

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