Opto-mechanical Fiber Optic Sensors

3

Flat-Cladding Fiber Bragg Grating Sensors for Large Strain Amplitude Fatigue Tests

Xija Gu     Ryerson University, Toronto, ON, Canada

Abstract

We have successfully developed a flat-cladding fiber Bragg grating sensor for large cyclic strain amplitude tests of up to ±8000 με. The increased contact area between the flat-cladding fiber and the substrate, together with the application of a new bonding process, significantly increased the bonding strength. In push–pull fatigue tests of an aluminum alloy, the plastic strain amplitudes measured by three optical fiber sensors differed by only 0.43% at cyclic strain amplitudes of ±7000 με and 1.9% at cyclic strain amplitudes of ±8000 με. We also applied the sensor on an extruded magnesium alloy for evaluating ...