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자료유형
학술저널
저자정보
저널정보
한국해양공학회 한국해양공학회지 한국해양공학회지 제3권 제1호
발행연도
1989.6
수록면
63 - 73 (11page)

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초록· 키워드

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Rotating bending fatigue tests were carried out on notched specimens made of S45C carbon steel under constant stress amplitude and block loading. Each test was performed in air and in artificial sea water.
The testing machine is an Ono-Type Rotating Bending Machine and the block loading tests were applied by Gassner Type.
The value of p was changed in the range of 0.25 to 1.0(0.25, 0.5, 0.75 and 1.0) and the fatigue life was defined on the criterion of failure life.
The following conclusions were obtained ;
1) Fatigue life was affected by speed of revolution in the constant load test and the fatigue strength is higher at the high cyclic rate than at the low cyclic rate condition at the same fatigue life. From experimental data [N<SUB>?</SUB>(1000cpm)/N<SUB>?</SUB>(3000cpm) equals 0.46.
2) Corrosion fatigue strength of S45C carbon steel were monotonously decreased with increasing number of cycles. The fatigue strength in A. S. W decreased 34% at 100cpm and 31% at 3000cpm compared with that in air.
3) When the cyclic rate is 100cpm, the initial fatigue crack appeared on 66% at 50㎏?/㎟ stress level and on 33% at 15㎏?/㎟. Also, the fatigue crack propagation is more rapidly in case of high stress than low stress.
4) The fatigue limit was obtained by the Staircase Method of fatigue limit tests under constant amplitude loads ; Se=12.37㎏?/㎟.
5) Miner's hypothesis may be valid for p=0.75, and the prediction of fatigue life by Haibach's method agrees with this experimental data well for the case p=0.5. While the modified Miner's method agrees with this experimental data well for the case p=0.25.

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Abstract
1. 序論
2. 실험
3. 결과 및 고찰
4. 결론
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