Comparison of epoxy and braze-welded attachment methods for FBG strain gauges

J. McAlorum, T. Rubert, G. Fusiek, I. Mckeeman, L. Clayburn, M. Perry, P. Niewczas

Research output: Contribution to conferencePaperpeer-review

2 Citations (Scopus)
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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
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.
Original languageEnglish
Number of pages3
Publication statusPublished - 1 Nov 2017
EventIEEE SENSORS 2017 - Scottish Exhibition and Conference Centre, Glasgow, United Kingdom
Duration: 29 Oct 20171 Nov 2017


ConferenceIEEE SENSORS 2017
Country/TerritoryUnited Kingdom
Internet address


  • fatigue
  • static
  • epoxy
  • braze-welded
  • FBG
  • humidity

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