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Functionalised roving for structural health monitoring of composites

Abstract Here, we investigated photochromic glass fibre threads produced with the sol–gel coating technique and used it as sewing threads to produce stitched glass–polypropylene composites. The possibility of making sol–gel photochromic glass fibre threads, the morphology of the glass fibre thread and the tensile property of glass fibre sewing threads before and after sol–gel treatment have been studied in this work. The photochromic glass fibre thread was successfully stitched into glass–polypropylene composites as sewing threads and showed an efficient and effective response to UV light. Our results indicate that sol–gel coating is an efficient way to produce photochromic glass fibre. In addition, the sol–gel coating does not significantly affect the tensile performance of the glass fibre.