Abstract
Abstract This is a study on the distribution of acoustic emission parameters during a burst test for a type-II CNG vehiclefuel tank. A resonant AE sensor with a central frequency of 150 kHz was attached to the composite materials in the centerof the fuel tank. The pressure was increased from 30 to 100% of the expected burst pressure and was maintained for 10 minutesat each level. Damage at 70% of expected burst pressure occurred by various damage mechanisms including fiber breakageand delamination, while that of below 60% only occurred by matrix crack initiation and growth. The count, duration and risetime of the AE signal at 60% of the expected burst pressure are distributed below 500, 5000µs and 300µs, respectively. Then,at above 70% they increased with pressure by superimposing of individual AE signal generated at a nearby place. These resultsconfirmed that the analysis of the distribution of AE parameters is an effective tool for estimating damage of a CNG fuel tank.Key wordsacoustic emission, AE parameter, fuel tank, GFRP.
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