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Open AccessArticle

Internal Residual Strain Measurements in Carbon Fiber-Reinforced Polymer Laminates Curing Process Using Embedded Tilted Fiber Bragg Grating Sensor

1
Department of Mechanical Engineering, National Kaohsiung University of Science and Technology, 415 Chien Kung Road, Kaohsiung 807, Taiwan
2
Department of Aeronautical and Mechanical Engineering. Air Force Academy, Academy, No.Sisou 1, Jieshou W. Road, Kaohsiung 820, Taiwan
3
Department of Aviation Management, Chinese Air Force Academy, No.Sisou 1, Jieshou W. Rd., Gangshan Dist., Kaohsiung 82047, Taiwan
*
Author to whom correspondence should be addressed.
Polymers 2020, 12(7), 1479; https://doi.org/10.3390/polym12071479
Received: 31 May 2020 / Revised: 25 June 2020 / Accepted: 29 June 2020 / Published: 1 July 2020
Carbon fiber reinforced plastics (CFRP) have many mechanical properties that are superior to those of conventional structural materials and are becoming more and more widely used. Monitoring the curing process used to produce such composite material is important to ensure the quality of the process, especially for the characterization of residual strains after the material has been manufactured. In this study, we present a tilted fiber Bragg grating (TFBG) sensor used to monitor the curing of CFRP composite materials. The TFBG sensor was embedded into the layers of CFRP laminates to study the curing residual strain of the laminates. The experimental results showed that the curing residual stress was about −22.25 MPa, the axial residual strain was −281.351 με, and lateral residual strain of 89.91 με. The TFBG sensor was found to be sensitive to the curing residual strain of the CFRP, meaning that it has potential for use in applications involving composite curing processes. Moreover, it is indeed possible to improve the properties of composite materials via the optimization and monitoring of their curing parameters. View Full-Text
Keywords: tilted fiber bragg grating; Carbon fiber-reinforced plastics; residual strain; curing monitoring tilted fiber bragg grating; Carbon fiber-reinforced plastics; residual strain; curing monitoring
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MDPI and ACS Style

Ma, K.-P.; Wu, C.-W.; Tsai, Y.-T.; Hsu, Y.-C.; Chiang, C.-C. Internal Residual Strain Measurements in Carbon Fiber-Reinforced Polymer Laminates Curing Process Using Embedded Tilted Fiber Bragg Grating Sensor. Polymers 2020, 12, 1479.

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