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Refill friction stir spot welding of thermoplastic composites: Case study on Carbon-fiber-reinforced polyphenylene sulfide
https://orcid.org/0000-0002-5300-5601
Abstract Refill Friction Stir Spot Welding (refill FSSW) is an innovative solid-state welding technique that has been successfully applied to various combinations of metallic materials. The objective of the present study is to investigate the feasibility of refill FSSW for polymer–polymer structures, with a specific emphasis on carbon-fiber-reinforced polyphenylene sulfide (CF-PPS). The influence of the key joining parameters, i.e. force, plunge depth, rotational speed, and tool diameter, has been analyzed in terms of the resulting joint microstructure, mechanical strength, and failure mechanisms. The lap shear tests revealed two primary failure modes: interfacial shear failure and nugget pull-out. Fracture surfaces exhibited broken fibers. The depth of the joint was found to play a crucial role in determining the failure mode, with interfacial shear failure resulting in higher lap shear strength. Thermal analyses conducted on the produced joints showed no evidence of thermal degradation, which aligns with the temperature measurements during the process, as they remained below the melting temperature of CF-PPS.
Highlights 2 mm thin CF-PPS overlapped plates have been successfully joined via refill Friction Stir Spot Welding (refill FSSW). Joining depth responsible for interfacial shear failure and thus higher mechanical performance (ultimate lap shear force). Temperature measurements in line with microscopic observations showing no signs of thermal degradation within joints. Defect-free joints with a smooth weld line and no volumetric defects were obtained for optimized parameter ranges. Nanoindentations alongside DSC measurements indicate reduction of mechanical properties of the joining area.
Refill friction stir spot welding of thermoplastic composites: Case study on Carbon-fiber-reinforced polyphenylene sulfide
https://orcid.org/0000-0002-5300-5601
Abstract Refill Friction Stir Spot Welding (refill FSSW) is an innovative solid-state welding technique that has been successfully applied to various combinations of metallic materials. The objective of the present study is to investigate the feasibility of refill FSSW for polymer–polymer structures, with a specific emphasis on carbon-fiber-reinforced polyphenylene sulfide (CF-PPS). The influence of the key joining parameters, i.e. force, plunge depth, rotational speed, and tool diameter, has been analyzed in terms of the resulting joint microstructure, mechanical strength, and failure mechanisms. The lap shear tests revealed two primary failure modes: interfacial shear failure and nugget pull-out. Fracture surfaces exhibited broken fibers. The depth of the joint was found to play a crucial role in determining the failure mode, with interfacial shear failure resulting in higher lap shear strength. Thermal analyses conducted on the produced joints showed no evidence of thermal degradation, which aligns with the temperature measurements during the process, as they remained below the melting temperature of CF-PPS.
Highlights 2 mm thin CF-PPS overlapped plates have been successfully joined via refill Friction Stir Spot Welding (refill FSSW). Joining depth responsible for interfacial shear failure and thus higher mechanical performance (ultimate lap shear force). Temperature measurements in line with microscopic observations showing no signs of thermal degradation within joints. Defect-free joints with a smooth weld line and no volumetric defects were obtained for optimized parameter ranges. Nanoindentations alongside DSC measurements indicate reduction of mechanical properties of the joining area.
Refill friction stir spot welding of thermoplastic composites: Case study on Carbon-fiber-reinforced polyphenylene sulfide
https://orcid.org/0000-0002-5300-5601
Abstract Refill Friction Stir Spot Welding (refill FSSW) is an innovative solid-state welding technique that has been successfully applied to various combinations of metallic materials. The objective of the present study is to investigate the feasibility of refill FSSW for polymer–polymer structures, with a specific emphasis on carbon-fiber-reinforced polyphenylene sulfide (CF-PPS). The influence of the key joining parameters, i.e. force, plunge depth, rotational speed, and tool diameter, has been analyzed in terms of the resulting joint microstructure, mechanical strength, and failure mechanisms. The lap shear tests revealed two primary failure modes: interfacial shear failure and nugget pull-out. Fracture surfaces exhibited broken fibers. The depth of the joint was found to play a crucial role in determining the failure mode, with interfacial shear failure resulting in higher lap shear strength. Thermal analyses conducted on the produced joints showed no evidence of thermal degradation, which aligns with the temperature measurements during the process, as they remained below the melting temperature of CF-PPS.
Highlights 2 mm thin CF-PPS overlapped plates have been successfully joined via refill Friction Stir Spot Welding (refill FSSW). Joining depth responsible for interfacial shear failure and thus higher mechanical performance (ultimate lap shear force). Temperature measurements in line with microscopic observations showing no signs of thermal degradation within joints. Defect-free joints with a smooth weld line and no volumetric defects were obtained for optimized parameter ranges. Nanoindentations alongside DSC measurements indicate reduction of mechanical properties of the joining area.
Refill friction stir spot welding of thermoplastic composites: Case study on Carbon-fiber-reinforced polyphenylene sulfide
Schäfer, H. (Autor:in) / Blaga, L.A. (Autor:in) / Stöver, E. (Autor:in) / Klusemann, B. (Autor:in)
Thin-Walled Structures ; 191
17.07.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Polyphenylene sulfide (PPS) composites reinforced with recycled carbon fiber
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