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Article

Ultrasonic Attenuation Characteristics of Glass-Fiber-Reinforced Polymer Hull Structure

1
Department of Ocean System Engineering, Mokpo National Maritime University, Mokpo 58628, Korea
2
Department of Naval Architecture and Ocean Engineering, Seoul National University, Seoul 08826, Korea
3
Department of Naval Architecture and Ocean Engineering, Mokpo National Maritime University, Mokpo 58628, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Ana Paula Betencourt Martins Amaro
Appl. Sci. 2021, 11(14), 6614; https://doi.org/10.3390/app11146614
Received: 20 April 2021 / Revised: 5 July 2021 / Accepted: 16 July 2021 / Published: 19 July 2021
(This article belongs to the Special Issue Smart Shipbuilding and Marine Production Technologies)
Glass fiber-reinforced polymer (GFRP) ship structures have hull plate thicknesses of 10 mm or more and are fabricated using a higher proportion of resin matrix systems than E-glass fiber reinforcements. Therefore, GFRP is classified as a highly attenuative material, and this characteristic is a major cause of large errors in ultrasonic nondestructive testing for quality inspections. In this study, considering the aforementioned design and fabrication characteristics of GFRP ship structures, hull plate prototypes with various glass fiber weight fractions, glass contents (Gc), and laminate thicknesses were fabricated. Then, a pulse-echo ultrasonic test was performed with the fabricated prototypes, and the attenuation characteristics of the GFRP hull plates were investigated by conducting statistical analyses. These results demonstrated that with a variation of 30–50% in the Gc used for GFRP structure design, the plate thickness variation had a greater impact than the Gc variation on the attenuation characteristics. The increase in Gc naturally increased the scattering of ultrasonic waves but did not significantly affect the attenuation coefficient. The effects of the inner voids on the ultrasonic waves were also investigated, and the results confirmed that the laminates in this Gc region did not significantly affect attenuation. View Full-Text
Keywords: composite ship; glass fiber-reinforced polymer; ultrasonic; defect composite ship; glass fiber-reinforced polymer; ultrasonic; defect
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MDPI and ACS Style

Han, Z.; Jeong, S.; Jang, J.-W.; Woo, J.H.; Oh, D. Ultrasonic Attenuation Characteristics of Glass-Fiber-Reinforced Polymer Hull Structure. Appl. Sci. 2021, 11, 6614. https://doi.org/10.3390/app11146614

AMA Style

Han Z, Jeong S, Jang J-W, Woo JH, Oh D. Ultrasonic Attenuation Characteristics of Glass-Fiber-Reinforced Polymer Hull Structure. Applied Sciences. 2021; 11(14):6614. https://doi.org/10.3390/app11146614

Chicago/Turabian Style

Han, Zhiqiang, Sookhyun Jeong, Jae-Won Jang, Jong H. Woo, and Daekyun Oh. 2021. "Ultrasonic Attenuation Characteristics of Glass-Fiber-Reinforced Polymer Hull Structure" Applied Sciences 11, no. 14: 6614. https://doi.org/10.3390/app11146614

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