Multifunctional Glass-Fiber Composite with Self-Monitoring Capability

Abstract

Abstract Composites that are capable to provide multiple functionalities represent a fundamental step toward the realization of light weight, high performing and autonomous materials. In this paper a piezoelectric polyvinylidene difluoride (PVDF) electrospun fabric is investigated as sensing layer for making a self-monitoring composite material. The micro-scale structure of the fabric consists of an aggregation of micro-fibers that are randomly distributed forming a porous film that allows a full absorption of the epoxy matrix as required for multi-layered composites. The application of a force on the composite induces a charge separation within the atomic structure of the embedded PVDF fabric generating an electrostatic output voltage. These unique features allowed to continuously monitor vibrations under dynamic conditions.