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AI7075합금의 고온 최소 크리프 변형속도와 파단수명에 관한 연구
우태수,이치우 慶南大學校 附設 工業技術硏究所 2003 硏究論文集 Vol.21 No.1
크리프 수명 예측에 관한 연구로서 Larson Miller는 수명 예측식 t=T(C+log t)으로 시간-온도의 개념을 도입했고 Orr-Sherby와 Dorn은 크리프파단매개변수를 [ log t-(ΔH/RT)]라고 정의한바 있으며 본 연구에서는 고온 구조용 재료로 많이 사용되는 A17075-T651 합금을 사용하여 최근 크리프 파단 수명 해석에 많이 사용되는 수정 Mokman-Grant 관계식을 사용하였다. 수명 예측에 필요한 상수 m', C'를 각각 구하고 크리프 속도에 대한 온도와 응력의 의존성과 제3기 크리프 변형과정에서의 크리프 파단기구를 분석하였다. Modtechnological progress demands the use of materials at high temperature and high pressure. Constant load creep tests have carried out over a range of stresses at high temperatures. One of the most critical factors in considering such applications perhaps the most critical one is creep behavior. In this study, the stress exponents n were determined during creep over the temperature range of 275℃ to 325℃ and stress range of 36㎫ to 72㎫ in order to investigate the creep behavior. And the applicability of modified Monkman-Grant relationship was discussed.
진도훈,우태수,이치우 한국공작기계학회 2002 한국공작기계학회 추계학술대회논문집 Vol.2002 No.-
This paper dealt with FMEA, which is a method of the analysis to secure safety and confidence coming up to customers' expectation in consideration of the environment of the corporation, the industrial environment, and the functional improvement. And by using FMEA, We showed the example analyzed the confidence of the Air Supply System. It was proved by the result of the analysis that the rate of the breakdown which is usually regarded as the first important point to reform can't satisfy the selecting basis to improve. Also the result said that it is not right to depend on only the rate of the failure in making the list of the reform. Through the analysis of the breakdown, FMEA can present the important factors of the reform to improve the confidence of the system. In this study would show the important factors of the improvement in order to product the goods guaranteed confidence through the method of FMEA.