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CNG 연료탱크의 피로시험시 발생하는 음향방출신호 위치표정
지현섭(Hyun Sup Jee),이종오(Jong O Lee),주노희(No Hoe Ju),소철호(Cheal Ho So),이종규(Jong Kyu Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
This research seeks to evaluate damage on the fuel tank by an acoustic emission test when executing 20000 cycles fatigue test and thereafter burst test. Used gas cylinders in the experimental are three types as follows; one is sound cylinder, others are cylinders which contain longitudinal and transverse artificial defect. The size of artificial defect is a depth of 3 mm, width of 3 mm and length of 50 mm. In the case of the cylinder which artificial defect, unlike the expectation that it will burst in low pressure, the burst pressure of the cylinder did not differ much according to whether or not there were defects. However, when there was longitudinal defect, the location of burst was near the location of defect. This leads to the effect in which the thickness of the composite material becomes thinner according to the length of the longitudinal defect and this is judged to have an effect on the location of initiation and growth of crack in the liner. Also, for the acoustic emission signal, when there is longitudinal defect, the ratio of an event occurring at defect position among overall hits is more than 50 %, and the source location also accords very precisely with defect position.
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인공결함을 가진 CNG 연료탱크의 피로시험시 발생하는 음향방출 신호변수의 분석
지현섭(Hyun Sup Jee),이종오(Jong O Lee),주노희(No Hoe Ju),소철호(Cheal Ho So),이종규(Jong Kyu Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
This paper seeks to evaluate the acoustic emission test and the damage mechanism of cylinder after 20,000 cycles fatigue tests on type II gas cylinder with artificial defects. We were able to evaluate the damage mechanism through an analysis of acoustic emission parameters, such as the average rise time and average frequency of hits related to events, and the slope of amplitude distribution. According to the results, the average rise time of event signals was 30-90 ㎲ and the rise time of signals due to the growth of matrix crack was shorter than one from the initiation of matrix cracks. The initial and reverberation frequency of signals that occur from to the initiation and growth of matrix cracks were above 100-200 kHz and 150 kHz, respectively. In the amplitude distribution of signals that occurred during fatigue test has a characteristic slope of 0.04, 0.06, and 0.12 is estimated to be from the initiation of matrix crack, growth of liner fatigue crack and growth of matrix crack.
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광대역 탐촉자를 이용한 자동차용 CNG 탱크의 음향방출 신호 분석
지현섭(Hyun-Sup Jee),이종오(Jong-O Lee),주노희(No-Hoe Ju),소철호(Cheal Ho So),이종규(Jong-Kyu Lee) 한국비파괴검사학회 2012 한국비파괴검사학회지 Vol.32 No.1
본 연구에서는 광대역(100 kHz - 1 MHz) 탐촉자를 사용하여 자동차용 CNG연료탱크의 파열시험시 발생하는 음향방출신호의 분석을 통해 압력용기의 손상정도를 평가하였다. 압력이 420 bar까지 올라가기 전의 각 단계에서는 Kaiser 효과가 나타나고 creep 효과가 거의 나타나지 않으나, 420 bar 이상 상승시 creep 효과가 현저히 나타남으로써 용기가 손상을 입었다는 것을 알 수 있었으며, 480 bar 압력 상승 단계에서는 Kaiser 효과가 없어졌다. 540 bar의 압력 단계에서 공진형 탐촉자의 경우에서는 480 bar의 압력단계에 비하여 energy나 count 같은 activity가 감소하였으나 광대역 탐촉자의 경우 계속적으로 증가하였다. 또한 rise time이나 주파수 분석을 통해서 복합재료 압력용기의 손상 메카니즘을 관찰하기 위해서는 일반적으로 금속압력용기에서 많이 사용되는 공진형 탐촉자(150 kHz)보다 광대역 탐촉자가 효과적임을 알 수 있었다. This study is damage evaluation for CNG fuel tank during the burst test through the analysis of acoustic emission signals. Kaiser effect until the pressure 420 bar appears, but More than 420 bar by the creep effect appears significantly damaged vessels, and 480 bar pressure, the Kaiser effect of the rising phase was missing. Resonant transducer at 540 bar than 480 bar decreased activity such as energy and count Continually, but increased wideband transducer. In addition, through the rise time or frequency analysis of composite pressure vessels in order to observe the damage mechanisms wideband transducer is more effective than resonant transducer.
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