Hybrid sensors for impact-induced strain in smart composite plates

Farhad Akhavan; Steve E. Watkins; K. Chandrashekhara

doi:10.1117/12.207702

20 April 1995 Hybrid sensors for impact-induced strain in smart composite plates

Farhad Akhavan, Steve E. Watkins, K. Chandrashekhara

Proceedings Volume 2444, Smart Structures and Materials 1995: Smart Sensing, Processing, and Instrumentation; (1995) https://doi.org/10.1117/12.207702
Event: Smart Structures and Materials '95, 1995, San Diego, CA, United States

Abstract

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.

Citation Download Citation

Farhad Akhavan, Steve E. Watkins, and K. Chandrashekhara "Hybrid sensors for impact-induced strain in smart composite plates", Proc. SPIE 2444, Smart Structures and Materials 1995: Smart Sensing, Processing, and Instrumentation, (20 April 1995); https://doi.org/10.1117/12.207702

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