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크리프 파단 데이터의 변동성에 대한 새로운 고찰과 수명예측
정원택(Won-Taek Jung),공유식(Yu-Sik Kong),김선진(Seon-Jin Kim) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.10
This paper deals with the variability analysis of short term creep rupture test data based on the previous creep rupture tests and the possibility of the creep life prediction. From creep tests performed by constant uniaxial stresses at 600, 650 and 700℃ elevated temperature, in order to investigate the variability of short-term creep rupture data, the creep curves were analyzed for normalized creep strain divided by initial strain. There are some variability in the creep rupture data. And, the difference between general creep curves and normalized creep curves were obtained. The effects of the creep rupture time (RT) and steady state creep rate (SSCR) on the Weibull distribution parameters were investigated. There were good relation between normal Weibull parameters and normalized Weibull parameters. Finally, the predicted creep life were compared with the Monkman-Grant model.
스테인리스 강의 단시간 크리프 파단시간의 변동성과 수명예측
정원택(Won-Taek Jung),공유식(Yu-Sik Kong),김선진(Seon-Jin Kim) 한국해양공학회 2010 韓國海洋工學會誌 Vol.24 No.6
This paper deals with the variability of short term creep rupture time based on previous creep rupture tests and the statistical methodology of the creep life prediction. The results of creep tests performed using constant uniaxial stresses at 600, 650, and 700℃ elevated temperatures were used for a statistical analysis of the inter-specimen variability of the short tenn creep rupture time. Even under carefully controlled identical testing conditions, the observed short-term creep rupture time showed obvious inter-specimen variability. The statistical aspect of the short term creep rupture time was analyzed using a Weibull statistical analysis. The effect of creep stress on the variability of the creep rupture time was decreased with an increase in the stress level. The effect of the temperature on the variability also decreased with increasing temperature. A long term creep life prediction method that considers this statistical variability is presented. The presented method is in good agreement with the Lason-Miller Parameter (IMP) life prediction method.
마찰교반용접된 7075-T651 알루미늄 판재의 피로균열전파의 불규칙성
김선진(Seon Jin Kim),정의한(Yeui Han Jeong),손혜정(Hye Jeong Sohn),정원택(Won Taek Jung) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
The process of fatigue crack growth is generally random nature, due to many sources of variability, such as external loading, material properties and geometry conditions. Therefore it is important to investigate the statistical variability of fatigue crack growth in order to develop the methodology for stochastic fatigue crack growth life prediction. This paper is concerned with the statistical investigation of fatigue crack growth process for the FSWed 7075-T651 aluminum alloy. In this study, fatigue crack growth tests were conducted on 5 specimens of the FSWed 7075-T651 aluminum alloy under constant stress intensity factor range control, especially base metal, heat affected zones and weld metal specimens.