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- 저자 : 김헌경(Hun-Kyoung Kim) (검색결과 2 건)
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내열강 마찰용접재의 ISM에 의한 크리프 수명예측에 관한 연구
김헌경(HUN-KYOUNG KIM),김일석(IL-SEOCK KIM),이연탁(YEON-TAK LEE),공유식(YU-SIK KONG),오세규(SAE-KYOO OH) 한국해양공학회 2001 韓國海洋工學會誌 Vol.15 No.2
In this paper, the real-time prediction of high temperature creep life was carried out for the friction welded joints of dissimilar heat resisting steels (SUH3-SUH35). Various life prediction methods such as LMP (Larson-Miller Parameter) and ISM (initial strain method) were applied. The creep behaviors of those steels and the welds under static load were examined by ISM combined with LMP at 500, 600 and 700℃, and the relationship between these two methods was investigated. A real-time creep life (tr, hr) prediction equation by initial strain (ε0, %) under any creep stress (σ, ㎫) at any high temperature (T, K) was developed as follows : tγ=α ε0<SUP>β</SUP>σ<SUP>-1</SUP> where, ø=16 : α=10<SUP>51.412-0.104T+5.375×10<SUP>-5</SUP>T²</SUP>, β=-83.989-0.180T-9.957×10<SUP>-5</SUP>T², ø=20 : α=1069.910-0.146T+7.744×10-5T², β=-51.442+0.105T-5.595×10-5T² for SUH3-SUH35 friction weld of ø=16㎜ and ø=20㎜, respectively.
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자동차 크랭크 軸用 鋼材의 棒對棒 同種材 摩擦熔接의 疲勞强度 特性 및 AE 評價
오세규(Sea-Kyoo Oh),양형태(Hyung-Tae Yang),김헌경(Hun-Kyoung Kim) 한국해양공학회 1999 韓國海洋工學會誌 Vol.13 No.2
Nowadays, the crank shaft for motor vehicle has become essential as the important component. The machining precision was asked for manufacturing the shaft. They could be unstable in the quality by the conventional arc welding.<br/> Both in-process quality control and high reliability of the weld are the major concerns in applying friction welding to the economical and qualified mass-production. No reliable nondestructive monitoring method is avaliable at present to determine the real-time evaluation of automatic production quality control for bar-to-bar friction welding of the crank shaft of O.D. 24㎜ for motor vehicle.<br/> This paper, so that, presents the experimental examinations and statistical quantitative analysis of the correlation between the cumulative counts of acoustic emission(AE) during plastic deformation periods of the welding and the tensile strength and other properties of the bar-to-bar welded joints of O.D. 24㎜ shaft as well as the various welding variables, as a new approach which attempts finally to develop real-time quality monitoring system for friction welding, resulting in practical possiblility of real-time quality control more than 100% joint efficiency showing good weld with no micro structural defects.
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