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프레팅 조건 하에서 스틱-슬립 현상이 마찰력에 미치는 영향
정성훈(Sung-Hoon Jeong),용석주(Suk-Ju Yong),이영제(Young-Ze Lee) 한국트라이볼로지학회 2005 한국윤활학회지(윤활학회지) Vol.21 No.1
Friction and wear characteristics between two steel surfaces under fretting condition are investigated experimentally. The fretting damage caused by low-amplitude oscillatory sliding can be classified into three regimes of gross-slip, mixed-slip and partial-slip due to stick-slip phenomenon. One of the most important characteristics of fretting wear is the transition from gross-slip to mixed-slip. This study was focused on getting the degree of stick-slip out of the friction transition under fretting condition. Fretting wear is divided into three conditions of gross-slip/mixed-slip/partial-slip. The criteria for the division are friction and displacement amplitude, wear scar morphology and dissipated energy. In this test, friction force and displacement were measured for detecting the transition from mixed-slip to gross-slip and qualitatively predicting the degree of the wear.
피복관 재료와 지지격자 형상에 따른 핵연료봉 피복관의 마멸거동에 관한 연구
김대정(Dae-Jung Kim),용석주(Suk-Ju Yong),정성훈(Sung-Hoon Jeong),이영제(Young-Ze Lee),김일규(Il-Kyu Kim) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.36 No.-
Fretting is the small-amplitude oscillatory motion, usually tangential, between two solid surfaces in contact. fretting wear is wear arising as a result of fretting. In nuclear power plant, high flow rates can induce vibration of the nuclear fuel rod cladding tubes resulting in fretting wear damage due to contacts between the tubes and their supports. In this paper the sliding wear' tests and fretting wear tests were performed in water at room temperature. Sliding tests with the pin-on-disk type tribometer were done using nuclear fuel rod cladding tube materials of Zirconium and Zircaloy-4 alloy series against STS 304 under various applied loads. Fretting tests were done using some different tube materials and supporting grid shapes under various applied loads. From the results of sliding and fretting wear tests, the wear of tube materials can be predictable by obtaining wear coefficient using the work rate model. Depending on various normal load, tube materials, and supporting grid shapes, distinctively different wear scars of fretting and stick-slip mechanism can occur.