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http://dx.doi.org/10.3740/MRSK.2011.21.11.623

Distribution of Acoustic Emission Parameters during Load Holding for CNG Vehicle Fuel Tank  

Jee, Hyun-Sup (Korea Institute of Materials Science)
Lee, Jong-O (Korea Institute of Materials Science)
Ju, No-Hoe (Korea Institute of Materials Science)
Lee, Jong-Kyu (Pukyung National University)
So, Cheal-Ho (Dongshin University)
Publication Information
Korean Journal of Materials Research / v.21, no.11, 2011 , pp. 623-627 More about this Journal
Abstract
This is a study on the distribution of acoustic emission parameters during a burst test for a type-II CNG vehicle fuel tank. A resonant AE sensor with a central frequency of 150 kHz was attached to the composite materials in the center of the fuel tank. The pressure was increased from 30 to 100% of the expected burst pressure and was maintained for 10 minutes at each level. Damage at 70% of expected burst pressure occurred by various damage mechanisms including fiber breakage and delamination, while that of below 60% only occurred by matrix crack initiation and growth. The count, duration and rise time of the AE signal at 60% of the expected burst pressure are distributed below 500, 5000 ${\mu}s$ and 300 ${\mu}s$, respectively. Then, at above 70% they increased with pressure by superimposing of individual AE signal generated at a nearby place. These results confirmed that the analysis of the distribution of AE parameters is an effective tool for estimating damage of a CNG fuel tank.
Keywords
acoustic emission; AE parameter; fuel tank; GFRP;
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