High Strain Rate Characteristics of FBGs

• Main Authors: Chun-Yen Shih, 施俊言
• Other Authors: Liren Tsai
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/6266r5

碩士 === 國立高雄應用科技大學 === 機械與精密工程研究所 === 103 === 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 Al-6061 to study the FBG wave spectrums at high strain rate. The FBG embedded Al-6061 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 at 200s-1~450 s-1. By examining the strain history measurements from the FBG sensor and strain gauges, the strain history curves exhibit the J-shape curve feature at the strain rates in a range from 200s-1 to 450s-1 and the stresses of the specimen that were direct proportional to the strain rate. However, the FBG strain sensor has higher sensitivity and quicker response time than that of the strain gauge.