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http://dx.doi.org/10.7837/kosomes.2020.26.2.219

Correlation between Probe Frequency and Echo-Pulse Velocity for Ultrasonic Testing of a Fiber-Reinforced Plastic Hull Plate  

Lee, Sang-gyu (Graduate School Mokpo National Maritime University)
Han, Zhiqiang (Graduate School Mokpo National Maritime University)
Lee, Chang-woo (Korea Marine Equipment Research Institute)
Oh, Daekyun (Department of Naval Architecture and Ocean Engineering, Mokpo National Maritime University)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.26, no.2, 2020 , pp. 219-226 More about this Journal
Abstract
Nondestructive testing is one of the most commonly used quality inspection methods for evaluating ship structures. However, accurate evaluation is dif icult because various composite materials, such as reinforcements, resin, and fiber-reinforced plastics (FRPs), are used in hulls, and manufacturing quality differences are likely to exist owing to the fabrication environment and the skill level of workers. This possibility is especially true for FRP ships because they are significantly thicker than other structures, such as automobiles and aircraft, and are mainly manufactured using the hand lay-up method. Because the density of a material is a critical condition for ultrasonic inspection, in this study, a hull plate was selected from a vessel manufactured using e-glass fiber, which is widely used in the manufacture of FRP vessels with the weight fraction of the glass content generally considered. The most suitable ultrasonic testing conditions for the glass FRP hull plate were investigated using a pulse-echo ultrasonic gauge. A-scans were performed with three probes (1.00, 2.25, and 5.00 MHz), and the results were compared with those of the hull plate thickness measured using a Vernier caliper. It was found that when the probe frequency was higher, the eco-pulse velocity of the receiver had to be lowered to obtain accurate measurement results, whereas fewer errors occurred at a relatively low probe frequency.
Keywords
Composite material; Fiber-reinforced plastics(FRP); Ship structure; Nondestructive testing; Ultrasonic testing;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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