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Perry, Marcus
University of Strathclyde
in Cooperation with on an Cooperation-Score of 37%
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Publications (5/5 displayed)
- 2017Comparison of epoxy and braze-welded attachment methods for FBG strain gauges
- 2017Finite difference analysis and experimental validation of 3D photonic crystals for structural health monitoringcitations
- 2016First-time demonstration of measuring concrete prestress levels with metal packaged fibre optic sensorscitations
- 2013Induction brazing of Type-I fiber Bragg gratings into Kovar ferrules exploiting Curie transitioncitations
- 2012Mechanical strength of silica fiber splices after exposure to extreme temperaturescitations
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document
Comparison of epoxy and braze-welded attachment methods for FBG strain gauges
Abstract
This paper presents experimental results from fatigue and static loading tests performed on both epoxy and braze-welded FBG strain sensors. Most FBG attachment methods are relatively understudied, with epoxy the most commonly used. Long curing times and humidity sensitivity during curing render epoxy inappropriate for certain implementations. This work shows that a bespoke braze-welded attachment design is able to achieve a higher static failure limit of 22kN when compared to strain gauge epoxies, which fail at 20kN. Both methods<br/>demonstrate high fatigue life, with no significant deterioration after two million cycles. Epoxy swelling was observed when the sensors were held at a relative humidity of 96%, applying ~0.6 mϵ of tension to the FBG, whereas a braze-weld attachment was unaffected by humidity.