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진동내구 해석기법을 이용한 유닛 브라켓류 단품 시험모드 결정
문성인(Seongin Moon),전재욱(Jaewook Jeon),윤성식(David Yoon) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Unit brackets, suspending some sensors, subjected to acceleration loads, often fail due to self-vibration. To prevent such failures, it is necessary to understand the fatigue failure mode and to evaluate the fatigue life using tests or analysis techniques. The objective of this study is to develop the component test specifications, which are applicable to predict fatigue life at initial product design step, for unit brackets using vibration fatigue technique. To fulfill the obective, the necessity of the fatigue analysis considering resonant effect was reviewed. Also, a series of vibration fatigue analyses was carried out according to the variation of acceleration direction and magnitude. Then, the optimum vibration fatigue test specification for component, which shows equivalent failure mode with vehicle test condition, was constructed.
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.