On accurate characterization of interfacial morphology and damage evolution of thermoplastic composite welded joints: A microscale study via in-situ micro-CT

Thermoplastic composites are regarded as a potential alternative to their thermoset counterparts in aircraft industries owing to their cost-effective manufacturing process and weldability. However, one of the most significant limitations of the currently used evaluation methods for the welded joints is that they are mostly destructive, which makes the loss of information on the initial features of the welding interface. In this study, the interfacial morphology and damage evolution of ultrasonic welded GF/PPS thermoplastic composite joints were accurately characterized by using in-situ micro-CT technique. The morphology of the weldline was demonstrated by the evolution of void defects, fibre architecture and resin contents of specimens created using different sonotrode travels. Based on that, the damage evolution scenario of the specimens welded at 40% and 100% travels was successively analysed via in-situ micro-CT analysis. In the final part, the newly proposed technique was comparatively discussed with the traditional characterization methods.

Automated summary

Thermoplastic composites are considered as a potential alternative to thermoset composites in aircraft industries due to their cost-effective manufacturing process and weldability. However, the limitation of current evaluation methods for welded joints is that they are mostly destructive, resulting in the loss of information on the initial features of the welding interface. In this study, in-situ micro-CT technique was used to accurately characterize the interfacial morphology and damage evolution of ultrasonic welded GF/PPS thermoplastic composite joints. The morphology of the weldline was demonstrated by the evolution of void defects, fiber architecture, and resin contents of specimens with different sonotrode travels. The damage evolution scenario of the specimens welded at 40% and 100% travels was analyzed through in-situ micro-CT analysis.