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Structural Health Monitoring through Electroluminescent Strain Sensing Carbon Fiber Reinforced Polymer


Title: Structural Health Monitoring through Electroluminescent Strain Sensing Carbon Fiber Reinforced Polymer

Authors: Jiefeng Qiu, Mohamad K. Idris, Gerd Grau, Garrett W. Melenka

DOI: 10.33599/nasampe/s.21.0482

Abstract: Carbon fiber (CF) composite replacements in structural components are becoming more prevalent due to their favorable properties. There is an urgent need to develop comprehensive monitoring techniques to evaluate the structural state of CF composites. Conventional damage inspection methods for CF composites are typically destructive, expensive, and do not provide spatial resolution. Here, the structural health monitoring (SHM) of carbon fiber reinforced polymer (CFRP) is achieved using an innovative full-field electroluminescent (EL) method. The method is validated with strain-induced resistive measurements and digital image correlation (DIC). The self-sensing CFRP is fabricated by consecutively overlaying the surface of any CFRP structure with an EL dielectric phosphor epoxy resin layer and a semi-transparent CF veil. Upon voltage excitation, the electrical resistance contour is visualized through EL luminance. Utilizing the piezoresistive and capacitive properties of the device, structural states can be monitored through 4-point resistive measurement and machine vision strain measurement. ASTM standardized tensile and fatigue tests are performed with a test frame to acquire the resistance change, DIC, and EL images of the device. This study provides a novel, non-damaging SHM method that allows real-time inspection of any CFRP part. The proposed method can detect, localize, and characterize strain and damage of conventional CFRP structures.

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Conference: SAMPE NEXUS 2021

Publication Date: 2021/06/29

SKU: TP21-0000000482

Pages: 18

Price: FREE

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