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Weldbond 및 접착에 의한 박판 구조 접합에 관한 연구
권재도(J.D.Kwon),전상표(S.P.Jeon),신규식(K.S.Shin),박희대(H.D.Park) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_2
This study was performed to evaluate how the jointing effect was improved, compared with that of spotwelding specimens after the tensile-shear test under the various conditions of the specimen, which had the single lap joints by weldbonding and bonding, for the development of the structural jointing techniques. The result shows that strength of weldbonding and bonding specimens were improved, comparing to that of spotwelding specimens. Therefore, it is expected that weldbonding and bonding techniques are applicable to the thin plate structures with the adaptability of productive lines and economical usage.<br/>
Inconel 600 합금의 고온 프레팅 피로수명에 관한 연구
박대규(D. K. Park),우승완(S. W. Woo),윤동환(D. H. Yoon),정한규(H. K. Jeung),정일섭(I. S. Chung),권재도(J. D. Kwon) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The safety needs in the operation of nuclear power plant facilities have been increased due to the high temperature and pressure operation conditions within these facilities. Several reports exist on the fretting occurring in the materials of stearn generator tubes used in nuclear power plants, which leads to a lower service life. The Inconel 600 alloy, used in steam generator tubes, is a type of nickel-chromium based heat resistant alloy. However, it is necessary to establish a systematic database to guarantee its integrity because there are few data indicating fretting fatigue behaviors at both room and high temperature conditions for the Inconel 600 alloy. Thus, this study analyzed the change in the fatigue characteristics of the Inconel 600 alloy under fretting fatigue by applying plain and fretting fatigue tests at 320℃, which is the room and actual operating temperature applied to the materials of stearn generator tubes. In addition, this study measured the change in the friction force for repetitive cycles in fretting fatigue tests and analyzed the mechanism of fretting fatigue by observing the fracture surfaces.
SiC 보강 Al 복합재료의 전기화학적 방법에 의한 부식 특성에 관한 연구
문윤배(Y.B.Moon),권재도(J.D.Kwon),김중형(J.H.Kim),박중철(J.C.Park),배용탁(Y.T.Bae) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
In the present investigation the corrosion behavior and resistance for Al6061, SiCp/Al and SiCw/Al composites are evaluated under pH 3, 5, 7, 9 and 11 in distilled water environment. The electrochemical polarization thchnique was employed in the investigation. Through the investigation the following results are estimated pitting corrosion under pH 3, 5, 7, 9 and uniform corrosion under pH 11. The corrosion rate were the worst in the pH 3 environment, pH 11, 9, 7 and 5 in order. And the corrocion resistance of SiCw/Al and SiCp/ Al have increased than Al6061 matrix.
우창수 ( C. S. Woo ),김완두 ( W. D. Kim ),김기세 ( K. S. Kim ),권재도 ( J. D. Kwon ) 한국고무학회 2002 엘라스토머 및 콤포지트 Vol.37 No.3
우수한 신장성과 탄성복원 능력으로 여러 산업분야에 방진, 제진, 충격흡수 및 완충재료로 널리 사용되고 있는 고무재료에 대하여 주파수, 변형률 진폭 및 온도변화가 동특성에 미치는 영향을 실험을 통하여 검토하였다. 동특성 시험은 5종류의 경도에 대하여 인장·압축시험과 전단시험용의 천연고무 시험 편으로 비 공진법으로 수행하였다. 시험결과, 경도가 높을수록 동적 특성 값들이 크게 나타났으며 저장탄성계수와 손실계수는 주파수가 증가할수록 서서히 증가하였으며 변형률 진폭이 커질수록 감소하였다. 또한, 온도 특성은 -50℃ 영역에서 저장탄성계수가 급격히 상승하며 손실계수가 최대로 나타나는 전이역임을 알 수 있었다. Rubber materials with excellent damping property are widely applied for vibration isolators. The dynamic characteristics of the rubber materials for vibration isolators were investigated. Dynamic tests for rubber materials with five different hardness were performed. In dynamic tests for test specimen, non-resonance method was used to obtain the dynamic storage modulus and loss factor. Moreover, the effect of dynamic vibration frequency, strain amplitude and temperature were investigated. As results, the storage modulus and loss factor genearlly increase when the hardness and frequency increase, and the glass transition temperature is -50℃ by a large change in modulus and loss factor
남욱희(W.H.Nam),이춘열(C.Y.Lee),채영석(Y.S.Chai),권재도(J.D.Kwon),박경흠(K.H.Park) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
A pressure plate, a component of the clutch system, was analyzed by a finite ele ment method under various load conditions including temperature distribution, cen trifugal force and diaphragm pressure. The results show that the effect of diaphra gm pressure is most important and suggests the direction of design change. Also, a hub plate was analyzed with two- and three-dimensional modelling and the resu Its were compared, which shows that a stress concentration occurs around the fille t area and that the effect of the thickness should be considered when the thicknes s is larger that 8mm. These results will be used as a basis for redesign of pressu re plates and hub plates.<br/>