Development of a strain measurement method utilizing a rectangular microstrip patch antenna

Wang, Wen‐Juan; Ren, Xiang; Sun, Yang; Li, Hao; Liu, Mabao

doi:10.3233/jae-150014

Cited by 1 publication

(2 citation statements)

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“…Under actual working conditions, FRP-strengthened steel structures may be affected by strain and cracking simultaneously. The results of Yi et al [ 25 ] and Wang et al [ 21 ] show that the strain can lead to a change in the size of the patch so that the resonance frequency of the antenna sensor is then shifted. Therefore, a study of the influence of strain on antenna sensors is highly valuable for accurate crack identification.…”

Section: Effects Of Strain On Crack Monitoringmentioning

confidence: 99%

“…Yi and Vyas [ 20 ] studied the influence of temperature on the relative dielectric constant of a substrate, and the effects of temperature changes in Rogers 6202 and Rogers 5880 materials on the strain test results from their sensors were compared. Wang et al [ 21 ] found that as the edge effect became more obvious with increasing substrate thickness, the resonant frequency could be affected; however, the edge effect of the microstrip antenna sensor could only be neglected if the substrate thickness was much smaller than the width of the patch antenna sensor structure.…”

Section: Introductionmentioning

confidence: 99%

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Crack Monitoring Method for an FRP-Strengthened Steel Structure Based on an Antenna Sensor

Liu

Chen

et al. 2017

Sensors

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Fiber-reinforced polymer (FRP) has been increasingly applied to steel structures for structural strengthening or crack repair, given its high strength-to-weight ratio and high stiffness-to-weight ratio. Cracks in steel structures are the dominant hidden threats to structural safety. However, it is difficult to monitor structural cracks under FRP coverage and there is little related research. In this paper, a crack monitoring method for an FRP-strengthened steel structure deploying a microstrip antenna sensor is presented. A theoretical model of the dual-substrate antenna sensor with FRP is established and the sensitivity of crack monitoring is studied. The effects of the weak conductivity of carbon fiber reinforced polymers (CFRPs) on the performance of crack monitoring are analyzed via contrast experiments. The effects of FRP thickness on the performance of the antenna sensor are studied. The influence of structural strain on crack detection coupling is studied through strain–crack coupling experiments. The results indicate that the antenna sensor can detect cracks in steel structures covered by FRP (including CFRP). FRP thickness affects the antenna sensor’s performance significantly, while the effects of strain can be ignored. The results provide a new approach for crack monitoring of FRP-strengthened steel structures with extensive application prospects.

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Section: Effects Of Strain On Crack Monitoringmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%