Characterization of acoustic emission parameters during testing of metal liner reinforced with fully resin impregnated cng cylinder
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Author list: Kenok R., Jomdecha C., Jirarungsatian C.
Publisher: Springer Science and Business Media, LLC
Publication year: 2015
Volume number: 158
Start page: 481
End page: 488
Number of pages: 8
ISBN: 9781493912384
ISSN: 0930-8989
eISSN: 0930-8989
Languages: English-Great Britain (EN-GB)
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Abstract
The aim of this paper is to study the acoustic emission (AE) parameters obtained from CNG cylinders during pressurization. AE from flaw propagation, material integrity, and pressuring of cylinder was the main objective for characterization. CNG cylinders of ISO 11439, resin fully wrapped type and metal liner type, were employed to test by hydrostatic stressing. The pressure was step increased until 1.1 time of operating pressure. Two AE sensors, resonance frequency of 150 kHz, were mounted on the cylinder wall to detect the AE throughout the testing. From the experiment results, AE can be detected from pressuring rate, material integrity, and flaw propagation from the cylinder wall. AE parameters including Amplitude, Count, Energy (MARSE), Duration and Rise time were analyzed to distinguish the AE data. The results show that the AE of flaw propagation was different in character from that of pressurization. Especially, AE detected from flaws of resin wrapped and metal liner was significantly different. To locate the flaw position, both the AE sensors can be accurately used to locate the flaw propagation in a linear pattern. The error was less than ฑ5 cm. ฉ Springer Science+Business Media New York 2015.
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