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

Research output: Contribution to conferencePaper

2 Citations (Scopus)

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
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.

Conference

ConferenceIEEE SENSORS 2017
CountryUnited Kingdom
CityGlasgow
Period29/10/171/11/17

Fingerprint

Strain gages
Atmospheric humidity
Curing
Fatigue of materials
Sensors
Swelling
Deterioration
Welds

Keywords

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

Cite this

McAlorum, J., Rubert, T., Fusiek, G., Mckeeman, I., Clayburn, L., Perry, M., & Niewczas, P. (2017). Comparison of epoxy and braze-welded attachment methods for FBG strain gauges. Paper presented at IEEE SENSORS 2017, Glasgow, United Kingdom.
McAlorum, J. ; Rubert, T. ; Fusiek, G. ; Mckeeman, I. ; Clayburn, L. ; Perry, M. ; Niewczas, P. / Comparison of epoxy and braze-welded attachment methods for FBG strain gauges. Paper presented at IEEE SENSORS 2017, Glasgow, United Kingdom.3 p.
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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 methodsdemonstrate 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.",
keywords = "fatigue, static, epoxy, braze-welded, FBG, humidity",
author = "J. McAlorum and T. Rubert and G. Fusiek and I. Mckeeman and L. Clayburn and M. Perry and P. Niewczas",
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McAlorum, J, Rubert, T, Fusiek, G, Mckeeman, I, Clayburn, L, Perry, M & Niewczas, P 2017, 'Comparison of epoxy and braze-welded attachment methods for FBG strain gauges' Paper presented at IEEE SENSORS 2017, Glasgow, United Kingdom, 29/10/17 - 1/11/17, .

Comparison of epoxy and braze-welded attachment methods for FBG strain gauges. / McAlorum, J.; Rubert, T.; Fusiek, G.; Mckeeman, I.; Clayburn, L.; Perry, M.; Niewczas, P.

2017. Paper presented at IEEE SENSORS 2017, Glasgow, United Kingdom.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Comparison of epoxy and braze-welded attachment methods for FBG strain gauges

AU - McAlorum, J.

AU - Rubert, T.

AU - Fusiek, G.

AU - Mckeeman, I.

AU - Clayburn, L.

AU - Perry, M.

AU - Niewczas, P.

N1 - © 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

PY - 2017/11/1

Y1 - 2017/11/1

N2 - 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 methodsdemonstrate 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.

AB - 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 methodsdemonstrate 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.

KW - fatigue

KW - static

KW - epoxy

KW - braze-welded

KW - FBG

KW - humidity

UR - http://ieee-sensors2017.org/

M3 - Paper

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McAlorum J, Rubert T, Fusiek G, Mckeeman I, Clayburn L, Perry M et al. Comparison of epoxy and braze-welded attachment methods for FBG strain gauges. 2017. Paper presented at IEEE SENSORS 2017, Glasgow, United Kingdom.