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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국자동차공학회 한국자동차공학회논문집 자동차공학회논문집 제3권 제1호
발행연도
1995.1
수록면
1 - 12 (12page)

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초록· 키워드

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Isothermal and thermal-mechanical fatigue characteristics of 12Cr heat resisting steel used for high temperature applications were investigated including hold time effects. Isothermal low cycle fatigue test at 600°C and in-phase, out-of-phase thermal-mechanical fatigue test at 350 to 600°C were conducted using smooth cylindrical hollow specimen under strain-control with total strain ranges from 0.006 to 0.0l5. Regardless of thermal-mechanical and isothermal fatigue tests, cyclic softening behavior was observed and much more pronounced in the thermal-mechanical fatigue tests with hold times due to the stress relaxation during the hold time. The phase difference between temperature and strain in thermal-mechanical fatigue tests resulted in significantly shorter fatigue life for out-of-phase compared to in-phase. The differences in fatigue lives were dependent upon the magnitudes of plastic strain ranges and mean stresses. During the hold time in the strain-controlled fatigue tests, the increase in the plastic strain range and the stress relaxation were observed. It appeared that the increase in plastic strain range per cycle and the introduction of creep damage made important contributions to the reduction of thermal-mechanical fatigue life with hold time, and the life reduction tendency was more remarkable in the in-phase than in the out-of-phase thermal-mechanical fatigue. Isothermal fatigue tests performed under the combination of fast and slow strain rates at 600°C showed that the fatigue life decreased as the strain rate and frequency decreased, especially for the low strain ranges.

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ABSTRACT

1. 서론

2. 실험편 및 실험방법

3. 주기 응력과 변형률의 거동

4. 변형률과 피로수명의 관계

5. 유지시간이 피로수명에 미치는 영향

6. 변형률 파형이 등온 저주기 피로수명에 미치는 영향

7. 결론

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