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Alloy 690 증기발생기 전열관 크리프 손상거동 예측
문성인(Seongin Moon),김종민(Jong-Min Kim),권준엽(Joon-Yeop Kwon),이봉상(Bong-Sang Lee),김민철(Min-Chul Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Steam generator tubes in nuclear power plants could undergo rapid changes in pressure and temperature, and the creep damage accumulates within only several hours or days. To estimate the creep behavior of structures constant stress creep curve is needed but many creep test data are obtained under constant load. Therefore, creep rupture behavior of structures cannot be accurately simulated. This study proposes a novel methodology to obtain the creep curve under constant stress using a modified θ projection method that considers the increase in true stress during creep deformation in a constant load creep test. The methodology is validated using finite element analysis. Also, a creep-strain model for Alloy 690 is proposed, ant then it is applied to evaluate the creep rupture behavior of SG tubes.
문성인(Seong-In moon),김민수(Min-Soo Kim),윤성진(Sung-Jin Yoon),전재욱(Jae-Wook Jeon) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Rubber components have been widely used in automotive industry as anti-vibration components for many years. These subjected to fluctuating loads, often fail due to the nucleation and growth of defects or cracks. In order to prevent such failures, it is necessary to understand the fatigue failure mechanism for rubber materials and to evaluate the fatigue life for rubber components. The objective of this study is to evaluate the fatigue failure mode and to select the applicable fatigue damage parameter for vulcanized rubber components. In order to investigate the applicability of the commonly used damage parameters, fatigue tests and corresponding finite element analyses and fatigue analyses for automotive rubber components were carried out. The fatigue failure mode was evaluated and the applicability of the fatigue damage parameters was verified. Thereby, strain energy density was proposed as the fatigue damage parameter for rubber components.
무기체계의 환경시험을 위한 한반도의 온도기준 설정에 관한 연구
문자영,김동길,성인철,홍연웅,Moon, Jayoung,Kim, DongGil,Sung, InChul,Hong, YeonWoong 한국데이터정보과학회 2016 한국데이터정보과학회지 Vol.27 No.6
환경시험의 목적은 시험대상 제품이 수명주기 중 겪을 수 있는 환경에 노출되었을 때 정상적인 기능을 수행할 수 있는지 설계 제조되었는지를 시험 평가하는 것이다. 본 논문은 한반도 내륙에서 운용할 군수장비의 운용환경조건에 대한 온도시험의 설계 기준을 제안한다. 온도기준은 과도하거나 과소하지 않게 합리적으로 설계되어야하는데 본 연구에서는 한국에서 가장 더웠던 지역과 가장 추웠던 지역을 기준으로 고온 및 저온에 대한 다양한 백분위별 발생빈도를 제시한다. 1904년부터 2014년까지 132개 관측지점의 기온 자료를 분석한 결과 1개월 기준으로 가장 더운 지역은 대구, 가장 추운 지역은 양평으로 확인되었다. 한반도 내륙의 운용 환경에서 고온과 저온의 1% 발생빈도값은 각각 $38.7^{\circ}C$와 -$29.0^{\circ}C$로 추정되었다. 아울러 상대습도, 풍속, 태양복사를 포함하는 고온과 저온의 일주기표도 제시한다. This paper suggests a temperature guidance for requirements which must be addressed in the preparation of specifications for military equipment used in land applications in the Korean peninsula. In general, the equipment should be designed to operate during all but a certain small percentage of the time. Daegu and Yangpyeong are the hottest and coldest regions by month, respectively, based on surface weather observations over 132 regions from 1904 to 2014. The 1-percent high and low temperatures for land environment in the South Korea are $38.7^{\circ}C$, and -$29.0^{\circ}C$, respectively. This paper also presents the temperature values occurring for specified frequencies of occurrence during the most severe month. Diurnal cycles associated with the hottest and coldest top one-percent temperatures, including associated solar radiation, relative humidity, and wind-speed are provided.