On the mechanical response of CFRP composite with embedded optical fibre when subjected to low velocity impact and CAI tests

Abstract

The influence of embedded optical fibres on the mechanical response of a CFRP composite laminate has been assessed in this paper with a specific focus on their effect when laminates are subjected to low velocity impact and compression after impact (CAI) tests. Although several studies are present in the literature, univocal conclusions based on their results are difficult to be drawn. Indeed, impact and compressive after impact performances depend on a plethora of different parameters in addition to the typical experimental uncertainty. First, the impact behaviour of a specific specimen configuration has been studied in terms of dynamic features, such as the impact force and displacements, and the absorbed energy. Then, the impact damage is assessed through macro-scale non-destructive testing, including ultrasonic and computed tomography. Furthermore, optical microscopy and SEM imaging have been conducted at a micro-scale level for a limited number of specimens. Conclusively, CAI tests have been performed and conclusions on the variation of the compressive strength and stiffness have been presented