Influence of processing parameters on the resin pocket geometry of smart composites embedded with <scp>Fiber Bragg Grating</scp> sensor and its fast prediction

Zhao, Zizhao; Zhang, Kaifu; Liu, Chuang; Cheng, Hui; Zou, Peng; Feng, Mengfei; Xiao, Junjie; Liang, Biao

doi:10.1002/pc.28190

Cited by 3 publications

References 39 publications

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Strain and damage monitoring of optical fiber sensor‐embedded carbon fiber reinforced polymer confined cracked pipes

Shi,

Kong,

et al. 2024

Polymer Composites

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Pipelines for water, oil, or gas transportation are prone to cracking damage due to severe service conditions. Carbon fiber reinforced polymer (CFRP) composites have been applied to repair cracked pipelines. In the present paper, fiber Bragg grating (FBG) and Brillouin optical time domain analysis (BOTDA) technology were applied to monitor the circumferential strains of the steel pipes and CFRP confined seamless/cracked steel pipes in hydrostatic testing. The finite element model (FEM), and the mechanical model were used to verify and analyze monitored strains. The results showed that FBG achieved real‐time and high‐precision strain monitoring with an error of less than 9.3%, better than BOTDA (less than 22.0%). Compared with FBG, the strain of FEM showed that the error of seamless pipe is less than 6%, and the error of cracked pipe is less than 15%. FEM strain field analysis revealed the failure mode of the confined cracked pipe in tensile fracture of structural adhesive between CFRP and steel substrate. The debonding was identified by the sudden strain drops (4.3%–26.2%) in the cracked area. The leakage was identified by a sudden drop (53.0%) in the slope significantly and fluctuations from the curve of strain and hydrostatic pressure after failure.Highlights Sensor‐embedded CFRP confined cracked pipes prevent leakage and monitor strain. Multiple FBG sensors are more accurate to monitoring the pipe strain than BOTDA. Debonding of CFRP confined cracked pipes is monitored by the sudden strain drop. Leakage of CFRP confined cracked pipes is detected by strain fluctuations.

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Strain and damage monitoring of optical fiber sensor‐embedded carbon fiber reinforced polymer confined cracked pipes

Shi,

Kong,

et al. 2024

Polymer Composites

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Research on Temperature Calibration of Fiber Bragg Grating Temperature Sensor Based on BPNN Algorithm

Du,

Kong

2024

2024 3rd International Symposium on Semiconductor and Electronic Technology (ISSET)

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Damage characterization of FRP embedded with different optical fibers under tensile load using acoustic emission and micrographic real-time inspection

Liu,

Wu,

Xiang

et al. 2024

Journal of Composite Materials

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Embedding optical fibers into fiber-reinforced plastics (FRPs) for composite health monitoring has attracted the interests of academia and industry recently though the impact of embedded optical fiber on FRP damage has not been clarified. In this study, the damage to the FRP structure caused by the embedded optical fibers was investigated. Five FRP samples incorporated with different types of optical fibers were subjected to tensile testing, and the crack initiation and propagation were in situ monitored using acoustic emission (AE) and micrographic inspection. After the AE signals were classified in terms of peak amplitude and peak frequency using K-means++ clustering, the damage progression from matrix cracking, fiber/matrix debonding, delamination, and fiber break were characterized. In-situ micrographic inspection clearly revealed the damage evolution around the embedded optical fiber. By correlating the stress-strain curves with the AE clustering and micrographic inspection results, it was verified that larger-diameter optical fibers reduce the modulus and ultimate strength of the FRP, while a good optical fiber/matrix interface mitigates these negative effects. The embedded optical fiber accelerated the crack propagation around it, leading to changes in the damage pattern. This phenomenon is the primary cause of FRP failure. Notably, polyimide-coated optical fibers with an outside diameter of 50 μm are ideal for embedded sensing as their incorporation into the matrix reduces the ultimate strength of FRP by only 1.8% with minimal impact on crack propagation.

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Influence of processing parameters on the resin pocket geometry of smart composites embedded with Fiber Bragg Grating sensor and its fast prediction

Cited by 3 publications

References 39 publications

Strain and damage monitoring of optical fiber sensor‐embedded carbon fiber reinforced polymer confined cracked pipes

Strain and damage monitoring of optical fiber sensor‐embedded carbon fiber reinforced polymer confined cracked pipes

Research on Temperature Calibration of Fiber Bragg Grating Temperature Sensor Based on BPNN Algorithm

Damage characterization of FRP embedded with different optical fibers under tensile load using acoustic emission and micrographic real-time inspection

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