• 제목/요약/키워드: 라손-밀러 파라미터

검색결과 6건 처리시간 0.021초

ISM에 의한 항공기용 가스터빈 재료의 크리프 수명예측 (Creep Life Prediction of Aircraft Gas Turbine material by ISM)

  • 공유식
    • 한국해양공학회지
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    • 제15권3호
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    • pp.43-48
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    • 2001
  • In this paper, the real-time prediction of high temperature creep strength and creep for nickel-based superalloy Udimet 720 (high-temperature and high-pressure gas turbine engine materials) was performed on round-bar type specimens under pure load at the temperatures of 538, 649 and 704$^{\circ}C$. The predictive equation of ISM creep has better reliability than that of LMP and LMP-ISM, and its reliability is getting better for long time creep prediction ($10^3~10^5$h).

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ISM에 의한 항공기용 가스터빈 재료의 크리프 수명예측 (Creep Life Prediction of Aircraft Gas Turbine Material by ISM)

  • 공유식;오세규;윤한기
    • 한국해양공학회:학술대회논문집
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    • 한국해양공학회 2001년도 춘계학술대회 논문집
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    • pp.108-113
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    • 2001
  • In this paper, the real-time prediction of high temperature creep strength and creep strength and creep life for nickel-based superalloy Udimet 720 (high-temperature and high-pressure gas turbine engine materials) was performed on round-bar type specimens under pure load at the temperatures of 538, 649 and 704$^{\circ}C$. The predictive equation of ISM creep has better reliability than that of LMP and LMP-ISM, and its reliability is getting better for long time creep prediction(10$^3$~10sup/5/h).

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ISM에 의한 압력용기용 고온재료의 크리프 수명예측 (Creep Life Prediction of Elevated Temperature Materials for Pressure Vessel by ISM)

  • 공유식;김헌경;오세규;임만배
    • 동력기계공학회지
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    • 제6권2호
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    • pp.40-47
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    • 2002
  • In this paper, friction welding optimization for 1Cr0.5Mo-STS304 (${\phi}14\;mm$), AE applications for the weld quality evaluation and the applications of various life prediction methods such as LMP (Larson-Miller Parameter) and ISM (initial strain method) were investigated : The creep behaviors of those steels and the friction welded joints under static load were examined by ISM combined with LMP at 400, 500, 550 and $600^{\circ}C$, and the relationship between these two kinds of phenomena was studied. The real-time predicting equations of elevated-temperature creep life (rupture time) under any creep stress at any elevated-temperature could be developed by LMP and LMP-ISM. It was confirmed that the life prediction equations by LMP and LMP-ISM are effective only up to 102 h and can not be used for long times of 103-106 h, but by ISM it can be used for long times creep prediction of more than 104 h with most reliability.

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압력용기용 고온재료의 ISM에 의한 크리프 수명예측(II) (Creep Life Prediction by ISM of Elevated Temperature Materials for Pressure Vessel(II))

  • 공유식;김헌경;황성필;김일석;오세규
    • 한국해양공학회:학술대회논문집
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    • 한국해양공학회 2001년도 춘계학술대회 논문집
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    • pp.307-313
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    • 2001
  • In this Paper, friction welding optimization for 1Cr0.5Mo-STS304($\Phi$14mm), AE applications for the weld quality evaluation and the applications of various life prediction methods such as LMP(Larson-Miller Parameter) and ISM(initial strain method) were investigated : the creep behaviors of those steels and the friction welded joints under static load were examined by ISM combined with LMP at 400, 500, 550 and $600^{\circ}C$, and the relationship between these two kinds of phenomena was studied. The real-time predicting equations of elevated-temperature creep life(fracture time) under any creep stress at any elevated- temperature could be developed by LMP and LMP-ISM, It was confirmed that the life prediction equations by LMP and LMP-ISM are effective only up to 10$^2$hrs and can not be used for long times of 10$^3$-10$^{6}$ hrs, but by ISM it can be used for long times creep prediction of more than 10$^4$hrs with most reliability.

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핵융합로용 저방사화 철강재료(RAFs)의 크리프 특성평가 (Evaluation on Creep Properties of Reduced Activation Ferritic Steel(RAFs) for Nuclear Fusion Reactor)

  • 공유식;윤한기;남승훈
    • 한국해양공학회지
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    • 제18권2호
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    • pp.58-63
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    • 2004
  • Reduced Activation Ferritic/Martensitic Steels (RAFs) are leading candidntes for structural materials of a D-T fusion reactor. One of the RAFs, JLF-l (9Cr-2W-V, Ta) has been developed and has shown to have good resistance against high-fluency neutrino irradiation and good phase stability. Recently, in order to clarify the strengthening mechanisms at high temperatures, a new scheme to improve high temperature mechanical properties is desired. Therefore, the test technique development of high temperature creep behaviors for this material is very important. In this paper, the creep properties and creep life prediction, using the Larson-Miler parameter method for JLF-l to be used for fusion reactor materials or other high temperature components, are presented at the elevated temperatures of 50$0^{\circ}C$, 55$0^{\circ}C$, $600^{\circ}C$, $650^{\circ}C$ and 704$^{\circ}C$. It was confirmed, experimentally and quantitatively, that a creep life predictive equation, at such various high temperatures, is well derived mr the LMP method.

가역투자율에 의한 첨단 페라이트강의 잔여수명에 대한 비파괴평가 (Nondestructive Characterization for Remanent Life of Advanced Ferritic Steel by Reversible Permeability)

  • 홍승표;류권상;김정석
    • 비파괴검사학회지
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    • 제33권2호
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    • pp.181-186
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    • 2013
  • 가역투자율을 이용하여 차세대 에너지 설비 재료로 사용되는 첨단 페라이트강의 잔여수명을 비파괴적으로 평가하고자 하였다. 가역투자율 측정법은 가역투자율 값이 자기 히스테리시스 루프의 미분과 동일하다는 이론을 기반으로 하게 된다. 측정 원리는 한 가진진동수로 가변된 락-인 증폭기를 사용하여 탐지코일에 유도된 조화성분들의 진폭 값을 기본으로 한다. 가역투자율의 피크 간격, 비이커스 경도 그리고 인장강도는 시효된 샘플들에서 시효시간이 증가함에 따라서 감소하였다. 가역투자율의 피크 간격과 라손-밀러 파라미터의 관계를 통해 첨단 페라이트강의 잔여수명을 비파괴적으로 예측하는 것이 가능해진다.