High strain rate characteristics of fiber bragg grating strain sensors

Abstract

Fiber Bragg Grating sensors (FBGs) have been utilized in various engineering fields because of their lightweight and good environment tolerance. In this research, FBG strain sensors were embedded inside carbon fiber reinforced polymer composites (CFRP) to study the FBG wave spectrums at high strain rate. The FBG embedded CFRP specimens were machined to dog-bone shape and a foil strain gauge was attached at its gauge section. The dynamic response of FBG sensors were then examined using split Hopkinson tension bar (SHTB). By comparing the strain measurements from FBGs, foil gauges, and SHTB measurements, the high strain rate behavior of FBG strain sensors was able to be explored at strain rates between 130 and 2,100 s-1. © The Society for Experimental Mechanics, Inc. 2013.