Impact detection on airborne multilayered structures

Bertrand Noharet; Jean Chazelas; Philippe Bonniau; Jerome Lecuellet; Marc J. Turpin

doi:10.1117/12.207696

20 April 1995 Impact detection on airborne multilayered structures

Bertrand Noharet, Jean Chazelas, Philippe Bonniau, Jerome Lecuellet, Marc J. Turpin

Proceedings Volume 2444, Smart Structures and Materials 1995: Smart Sensing, Processing, and Instrumentation; (1995) https://doi.org/10.1117/12.207696
Event: Smart Structures and Materials '95, 1995, San Diego, CA, United States

Abstract

This paper reviews the progress of an ongoing research program at Thomson-CSF and Bertin & Cie which addresses an optical fiber system dedicated to the assessment of impact induced damages on airborne multilayered structures. The method is based on the use of embedded high birefringence optical fiber sensors and distributed white light interfero-polarimetry. The first part is devoted to the transduction process efficiency within optical fibers depending on the applied force intensity, direction versus the fiber eigen axes and the interaction length. To understand the behavior of these optical fibers and calibrate the detection system, experiments have been conducted on elliptical core fibers, `bow-tie' fibers and side-hole fibers and showed a wide range of available sensitivities. The second step is related to the inclusion of optical fibers in a sandwich structure representative of an airborne dome, and composed of foam between glass/epoxy composite skins. Different designs of grooves in the foam and tube sheathings have been investigated to support and protect the optical fiber. Impacts have been performed on the structure in the 1 to 10 Joules energy range. Experimental impact location and energy measurements have been achieved for a variety of stress fields.

Citation Download Citation

Bertrand Noharet, Jean Chazelas, Philippe Bonniau, Jerome Lecuellet, and Marc J. Turpin "Impact detection on airborne multilayered structures", Proc. SPIE 2444, Smart Structures and Materials 1995: Smart Sensing, Processing, and Instrumentation, (20 April 1995); https://doi.org/10.1117/12.207696

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