Hybrid Sensors for Impact-induced Strain in Smart Composite Plates
An experimental study if conducted to evaluate the performance of different types of strain gauges for impact detection in eight layer symmetric cross-ply Graphite/Epoxy composite plates. The plates were impacted with rigid spheres using the drop-weight technique. The impacts did not produce apparent damage in the composite plate. The responses of calibrated surface-mounted extrinsic Fabry-Perot fiber optical sensors, a metalized polyvinylidene fluoride foil sensor, and a conventional electrical resistance rosette are compared. Characteristics of signal signatures from each sensor are demonstrated. Advantages and disadvantages of utilizing each type of strain sensor in the composite structure are discussed. The experimental strain responses are presented for various impact energies. The significant features of the strain response are contact duration, peak strain, strain rise time, and full width at half maximum. All of the sensors exhibited reproducible and similar results. The extrinsic Fabry-Perot fiber optical sensor performed superior with respect to sensitivity and accuracy of point measurement.
F. Akhavan et al., "Hybrid Sensors for Impact-induced Strain in Smart Composite Plates," SPIE Proceedings, SPIE -- The International Society for Optical Engineering, Jan 1995.
The definitive version is available at http://dx.doi.org/10.1117/12.207702
Proceedings SPIE: Smart Structures and Materials
Electrical and Computer Engineering
Mechanical and Aerospace Engineering
Keywords and Phrases
Composites; Sensors; Fiber Optics Sensors; Fabry-Perot Interferometers; Ferroelectric Polymers; Epoxies; Resistance
Article - Conference proceedings
© 1995 SPIE -- The International Society for Optical Engineering, All rights reserved.