Farhad Akhavan et al 1998 Smart Mater. Struct. 7 745 doi:10.1088/0964-1726/7/6/002
Farhad Akhavan
, Steve E Watkins
and K Chandrashekhara![]()
In-plane strain responses of surface-mounted extrinsic Fabry-Pérot interferometric (EFPI) fiber optic strain sensors are investigated. EFPI fiber optic strain sensors are mounted on three graphite/epoxy laminated composite plates. The plates are impacted with various size steel balls using a drop-weight technique. The impacts did not cause apparent damage. The first impact-induced strain peak was characterized by the rise time, peak value, full width at half maximum and decay time. The transient low-velocity impact response of EFPI fiber optic strain sensors is compared to the response from conventional electrical resistance strain gages and polyvinylidene fluoride (PVDF) piezoelectric film sensors. Orientation dependence and other characteristics of the EFPI fiber optic sensing technique are discussed. An in-house finite element program incorporates geometric nonlinearity and transverse shear deformation for the impact events. The finite element results closely match the experimental strain data for the first peak strain response.
07.60.Vg Fiber-optic instruments
62.20.F- Deformation and plasticity
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
81.70.Bt Mechanical testing, impact tests, static and dynamic loads
Instrumentation and measurement
Issue 6 (December 1998)
Received 12 September 1997, accepted for publication 27 July 1998
Farhad Akhavan et al 1998 Smart Mater. Struct. 7 745
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