Journal of Intelligent Material Systems and Structures

 

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Journal of Intelligent Material Systems and Structures, Vol. 17, No. 12, 1059-1067 (2006)
DOI: 10.1177/1045389X06064889

In situ Strain and Temperature Monitoring of Adaptive Composite Materials

Hyuk-Jin Yoon

Smart Structures & Composites Laboratory, KAIST, Korea

Daniele Marco Costantini

Hans Georg Limberger

René Paul Salathé

Advanced Photonics Laboratory, EPFL, Switzerland

Chun-Gon Kim

Smart Structures & Composites Laboratory, KAIST, Korea

Veronique Michaud

Laboratoire de Technologie des Composites et Polymères (LTC) Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland; veronique.michaud{at}epfl.ch

An optical fiber sensor is designed to simultaneously measure strain and temperature in an adaptive composite material. The sensor is formed by splicing two fiber Bragg gratings (FBGs) close to each other, which are written in optical fibers with different core dopants and concentrations. Their temperature sensitivities are hence different. The sensor is tested on an adaptive composite laminate made of unidirectional Kevlar-epoxy prepreg plies. Several 150 µm diameter prestrained NiTiCu shape memory alloy (SMA) wires are embedded in the composite laminate together with one fiber sensor. Simultaneous monitoring of strain and temperature during the curing process and activation in an oven is demonstrated.

Key Words: fiber Bragg grating • fiber sensor • adaptive composite • shape memory alloy • cure monitoring


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