In‐line residual strain monitoring for thermoplastic automated tape layup using fiber Bragg grating sensors

Abstract Automated tape layup (ATL) has been used extensively for manufacturing composites laminates using unidirectional prepregs high‐performance industries like aerospace. Residual stress is one of the defects that adversely affect quality. These stresses geometrical tolerances in form distortion final product and are found to have a detrimental impact on mechanical properties. In‐line monitoring such will help productivity increase achieving reliable process control. The aim present work demonstrate feasibility fiber Bragg grating sensors residual strains. FBGs embedded inside thermoplastic UD laminate. Temperature strain discrimination performed recognize intermittent strains during layup. Finally, develop an understanding global strain. Effect selective parameter formation evolution same also analyzed.