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김연욱(Yeonwook Kim),김재훈(Jaehoon Kim),박성한(Sunghan Park),이환규(Hwangyu Lee),김범근(Beomkeun Kim),이성범(Seongbeom Lee),곽재수(Jae Su Kwak) 한국추진공학회 2014 한국추진공학회지 Vol.18 No.4
The dry sliding wear behavior of graphite that is used as the sealing material to cut off hot gas was evaluated as a function of applied load, sliding speed and temperature. The reciprocating wear tests were carried out at room temperature and elevated temperatures. An attempt has been made to develop a mathematical model by response surface methodology and an analysis of variance technique was applied to confirm the validity of the developed model. Also, the wear mechanism was compared through the observation of the worn surface by SEM analysis.
암반 파쇄용 진동 리퍼 투스의 형상 변화에 따른 구조해석
김연욱(Yeonwook Kim),김재훈(Jaehoon Kim),박정열(Jungyeol Park),양규상(Gyusang Yang),박종원(Jongwon Park),김성현(Sunghyun Kim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Vibro ripper worked by high-frequency oscillation is developed to do rock fragmentation and work of ripper in the different concept with other existing breaker. The tooth of vibro ripper which conducts rock fragmentation, has highly affect work efficiency as typical supplies. In this study, different shapes of tooth of vibro ripper for rock fragmentation was proposed and effect of that was evaluated by the structural analysis. Moreover, the tooths applied changing of shape were structure tested and that performance was compared. It is expected for the effect of cost savings through shape change of the tooth.
고온차단 기밀용 그라파이트의 고온 미끄럼마모 특성 평가
김연욱(YeonWook Kim),김재훈(JaeHoon Kim),양호영(HoYeong Yang),박성한(SungHan Park),이환규(HwanKyu Lee),김범근(BumKeun Kim),이성범(SeungBum Lee),곽재수(JaeSu Kwak) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.11
고온의 가스유로를 조절하는 개폐식(On-Off)밸브의 구동축과 라이너 사이에 위치하여 구동장치로의 고온가스유입을 방지하는 기밀 소재에 대하여 연구하였다. 기밀 소재로 사용된 그라파이트(Graphite)는 구동장치에 의한 구동축의 지속적인 움직임으로 인해 마모가 발생한다. 본 논문은 고온가스 조절 밸브 내의 기밀 소재로 사용된 그라파이트(Graphite, HK-6)에 대한 상ㆍ고온 마모 특성을 평가하였다. 구동축의 소재인 레늄합금(W-25Re)에 대하여 그라파이트의 마모 시험을 수행하고 마찰계수와 비마모율을 비교하였다. 상온과 실제 작동 환경인 고온 485℃에서 미끄럼속도와 접촉하중의 변화에 따른 마찰계수와 비마모율을 평가하였다. 마모표면의 SEM분석을 통하여 상ㆍ고온 마모표면에 관찰되는 third body 를 확인하고 이로 인한 윤활효과를 고찰하였다. Sealing structure to prevent flowing hot gas into the driving device, located between the driving shaft and the liner of On-Off valve for controlling the hot gas flow path was studied. Wear occurs due to the constant movement of the driving shaft controlled by actuator on graphite as the sealing material. In this paper, the dynamic wear behavior in high temperature of graphite(HK-6) to be used as sealing material was evaluated. Reciprocating wear test was carried out for the graphite(HK-6) to the relative motion between shaft materials(W-25Re). The results of friction coefficient and specific wear rate according to contact load, sliding speed at room temperature and 485℃ considering the actual operating environment were evaluated. Through the SEM analysis of the worn surface, third body as lubricant films were observed and lubricant effect of third body was considered.
김연욱(Yeonwook Kim),김재훈(Jaehoon Kim),양호영(Hoyeong Yang),박성한(Sunghan Park),이환규(Hwankyu Lee),김범근(Bumkeun Kim),이성범(Seungbum Lee),곽재수(Jaesu Kwak) 한국추진공학회 2013 한국추진공학회 학술대회논문집 Vol.2013 No.5
마모 마찰기구로 널리 사용되는 그라파이트에 대하여, 고온가스 조절 밸브 내에서 가스 유입 방지용 씰링 그라파이트 소재(HK-6)의 고온 마모거동에 대하여 연구하였다. 구동축과 라이너 사이에 위치하여 지속적인 마모의 발생을 모사하기 위해 왕복동 마모 시험을 수행하였다. 마모 거동 변화의 영향 인자로 접촉 하중, 미끄럼 속도, 온도를 설정하고 민감도를 확인하였다. 마모 발생이 가장 적고 씰링 그라파이트 소재(HK-6)의 효율이 증대되는 최적조건에 대해 논의하였다. Graphite is commonly used as a solid lubricant leading to low friction coefficient and abrasion. In this study, wear behavior of sealing graphite(HK-6) at elevated temperature was evaluated. Reciprocating wear test was carried out as wear occurred graphite as a seal(HK-6) is positioned between the liner and driving shaft. Variables which are temperature, sliding speed and contact load are set. this study suggest optimized environment conditions through the wear properties of graphite.
김연욱(Yeonwook Kim),김재훈(Jaehoon Kim),양호영(Hoyoung Yang),박성한(Sunghan Park),이환규(Hwankyu Lee),김범근(Bumkeun Kim),이성범(Seungbum Lee),곽재수(Jaesu Kwak) 한국추진공학회 2013 한국추진공학회지 Vol.17 No.5
Graphite is commonly used as a solid lubricant leading to low friction coefficient and abrasion. In this study, wear behavior of sealing graphite(HK-6) at elevated temperature was evaluated. Reciprocating wear test was carried out as wear occurred graphite as a seal(HK-6) is positioned between the liner and driving shaft. Variables which are temperature, sliding speed and contact load are set. This study suggest optimized environment conditions through the wear properties of graphite.
그라파이트 씰의 비마모율 예측에 관한 수학적 모델 개발
김연욱(Yeonwook Kim),김재훈(Jaehoon Kim),박성한(Sunghan Park),이환규(Hwangyu Lee),김범근(Beomkeun Kim),이성범(Seongbeom Lee),곽재수(Jaesu Kwak) 한국추진공학회 2013 한국추진공학회 학술대회논문집 Vol.2013 No.12
고온고압의 밸브에서 연소가스의 유입을 방지하는 그라파이트 씰은 밸브 축의 구동으로 인한 마찰 및 마모에 노출된다. 그라파이트 씰의 마모로 인해 고온 가스 제어가 불가능해지기 때문에 씰의 마모 특성을 예측하는 것은 매우 중요하다. 본 논문에서는 비마모율을 마모 특성에 대한 척도로 설정하고 접촉하중, 미끄럼 속도, 온도 등을 변수로하여 그라파이트의 왕복동 마모 시험을 수행하였다. 반응표면 분석법(RSM)에 근거하여 실험계획을 정립하고 시험 결과에 대하여 분산분석법(ANOVA)을 통하여 유효한 수학적 모델을 제시하였다. 또한, 마모 된 표면의 SEM 분석을 통해 특정 조건에서의 마모 메커니즘을 분석하고 비교하였다. The dry sliding wear behavior of graphite (HK-6) that is used as the sealing material to cut off hot gas was evaluated as a function of applied load, sliding speed and temperature. The reciprocating wear tests were carried out at room temperature and elevated temperatures. An attempt has been made to develop a mathematical model by response surface methodology (RSM) and an analysis of variance (ANOVA) technique was applied to confirm the validity of the developed model. Also, the wear mechanism was compared through the observation of the worn surface by SEM analysis.
양호영(Ho-Young Yang),김재훈(Jaehoon Kim),하재석(Jaeseok Ha),김연욱(YeonWook Kim),박성한(Sunghan Park),이환규(Hwankyu Lee) 한국추진공학회 2013 한국추진공학회지 Vol.17 No.3
The graphites as airtight structure seals prevent high-pressure and high-temperature gas from flowing into actuator of propulsion system and generate lubricant film during wear procedure to assist lubricant and sealing. In this study, the tribological characteristics of the graphite in high-temperature are evaluated. In order to evaluate the tribological characteristics of high density graphite(HK-6), variables which are temperature, sliding speed and contact load are set. this study suggest optimized environment conditions through the wear properties of graphite. Consequeantly, high temperature is better than at room temperature to generate lubricant film, so that friction coefficient of graphite is lower at high temperature than at room temperature.
최훈석(Hoonseok Choi),김재훈(Jaehoon Kim),김연욱(Yeonwook Kim),서보휘(Bohwi Seo),문순일(Soonil Moon) 한국추진공학회 2014 한국추진공학회지 Vol.18 No.4
Graphite is commonly used for rocket nozzle. The purpose of the present study is to evaluate compression fracture behavior of ATJ graphite. Uniaxial compression test is conducted in accordance with ASTM C 695 in the range of R.T to 900°C. The size effects of specimen on the compressive strength and fracture behavior were investigated. Two types of cylindrical specimen, i.e., where the diameter to length ratio is 1:2 (ASTM C 695 specimen) or 1:1, were tested at room temperature.