• 제목/요약/키워드: contact surface

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표면막과 표면거칠기가 접촉 저항에 미치는 영향 (Effect of Surface Film and Surface Roughness on Contact Resistance)

  • 이현철;이보라;유용훈;조용주
    • Tribology and Lubricants
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    • 제35권1호
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    • pp.16-23
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    • 2019
  • In this study, we aim to analyze the effects of both contact layer properties and surface roughness on contact resistance. The contact has a great influence on performance in terms of electrical conduction and heat transfer. The two biggest factors determining contact resistance are the presence of surface roughness and the surface layer. For this reason we calculated the contact resistance by considering both factors simultaneously. The model of this study to calculate contact resistance is as follows. First, the three representative surface parameters for the GW model are obtained by Nayak's random process. Then, the apparent contact area, real contact area, and contact number of asperities are calculated using the GW model with the surface parameters. The contact resistance of a single surface layer is calculated using Mikic's constriction equation. The total contact resistance is approximated by the parallel connection between the same asperity contact resistances. The results of this study are as follows. The appropriate thickness with reduction effect for contact resistance is determined according to the difference in conductivity between the base layer and surface layer. It was confirmed that the standard deviation of surface roughness has the greatest influence on surface roughness parameters. The results of this study will be useful for selecting the surface material and surface roughness when the design considering the contact resistance is needed.

Al/TiN/Ti 전극의 Submicron contact에서의 전기적특성(2) (The Electrical properties of Al/TiN/Ti Contact at Submicron contact(2))

  • 이철진;엄문종;라용춘;김성진;성만영;성영권
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1995년도 하계학술대회 논문집 C
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    • pp.1069-1071
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    • 1995
  • The electrical properties of Al/TiN/Ti contact are investigated at submicron contacts. The contact resistance and contact leakage current are dependent on metallization, surface dopant concentration, semiconductor surface treatment and contact plug ion implantation. In this paper, the contact resistance and contact leakage current are studied according to surface dopant concentration, semiconductor surface treatment and contact plug ion implantation at 0.8 micron contact. The contact resistance and contact leakage current increases with increasing substrate ion concentration. HF cleaning represents high contact resistance but low contact leakage current while CDE cleaning represents low contact resistance but high contact leakage current. Contact plug ion implantation decreases contact resistance but increases contact leakage current. Specially, RTA represents good electrical properties.

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반복 미끄럼 접촉에 의한 표면층의 경화에 대한 해석 (The Analysis for Surface Hardening by Repeated Sliding Contact)

  • 박준목;김석삼
    • Tribology and Lubricants
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    • 제13권4호
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    • pp.71-78
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    • 1997
  • Wear is affected by numerous factors-contact load, sliding velocity and distance, friction coefficient, material properties and environmental conditions. Among these wear factors, surface hardness is one of very important factors to determine wear. But surface hardness is varied by work hardening during repeated sliding contact. In this reason wear rate is increased or decreased with varying surface hardness, and transition of wear mechanism is happened. In this study, the surface hardening by accumulating residual stress was analyzed by considering the repeated sliding Hertzian contact model. The results showed that surface hardness was increased with increasing contact load, friction coefficient and contact number. And the depth of hardening layer, plastic layer and elastic layer depended upon contact load and number, but they didn't depend upon friction coefficient. The predicted surface hardness was about 1.5-1.8 times as hard as the material.

2차원 접촉문제의 유한요소 해석을 위한 탐색알고리즘 (Searching Algorithm for Finite Element Analysis of 2-D Contact Problems)

  • 장동환;최호준;고병두;조승한;황병복
    • 한국정밀공학회지
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    • 제20권12호
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    • pp.148-158
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    • 2003
  • In this paper, efficient and accurate contact search algorithm is proposed for the contact problems by the finite element method. A slave node and a maser contact segment is defined using the side of a finite element on the contact surface. The specific goal is to develop techniques of reducing the nonsmoothness of the contact interactions arising from the finite element discretization of the contact surface. Contact detection is accomplished by monitoring the territory of the slave nodes throughout the calculation for possible penetration of a master surface. To establish the validity of the proposed algorithm, some different process and geometries examples were simulated. Efforts are focused on the error rate that is based on the penetrated area through the simulations fur large deformation with contact surface between deformable bodies. A proposed algorithm offers improvements in contact detection from the simulation results.

부스바 접점 가동시 접촉면에서 압점력 해석 (Analysis for Force Distribution on Surface Between Busbar Contacts)

  • 오연호;송기동;김귀식;김진기
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2003년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.82-84
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    • 2003
  • In case contact between point of contacts is not achieved well, contact resistance is grown, and by current concentration at current conducting contacts can weld. In order to decrease contact resistance between contacts in case of busbar, installing spring between fixed contact and moving contact. and then force on faying surface of contacts increase and contact resistance decrease. But, in case increase force of spring to widen contact area, operating force moving contact can grow, on the contrary force of spring is small, contact resistance becomes low. Therefore, need to optimize force and number of spring. position, and also need to examine force change on contact surface at point of contact moving. In this paper, dynamic kinetics analysis for force on faying surface of contacts is performed at unsteady state. It is showed to not uniform force on surface between contacts, and we can got more uniform force by means of change spring position.

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상어 표피 형상의 3차원 탄성접촉해석 (3D Elastic Contact Analysis of Sharkskin Surface Pattern)

  • 김태완
    • Tribology and Lubricants
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    • 제28권6호
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    • pp.297-302
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    • 2012
  • We conducted 3D elastic contact analysis of a sharkskin surface pattern for the characteristic assessment of biomimetic shark skin structure pattern for engineering applications. Rough sharkskin surfaces of similar size with real shark skin scales are generated numerically. Under the assumption of the contact of a plate on the generated sharkskin surface, contact performances such as contact pressure, real contact area, and surface separation are evaluated.

석탑구조물의 표면거칠기 및 충전재에 따른 석재접촉면의 구조특성 분석 (Structural Characteristics Analysis of Stone Contact Surface according to Surface Roughness and Filling Material of Stone Pagoda Structure)

  • 김호수;김동관;이승희;김덕문;조상순
    • 대한건축학회논문집:구조계
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    • 제34권6호
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    • pp.19-27
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    • 2018
  • The stone pagoda structure is treated as a discontinuous masonry structure, and the contact surface characteristics between stones is a very important factor in the discontinuum behavior analysis. So, it is necessary to find out material and structural characteristics of stone contact surface to perform the structural analysis for safety evaluation. Accordingly, it is important to analyze the material properties of stone surface and secure the structural characteristics through various contact surface states. Therefore, in this study, various test specimens applying the filler between the surface roughness and the stone in the contact surface treatment technique of the stone pagoda were manufactured, and compression test and shear test were carried out. Also, we analyzed the material and structural characteristics of the stone contact surface through the comparison of experimental results.

Rigid Gas Permeable Contact Lenses의 미세구조에 대한 연구 (The Study of the Ultrastructure on the Rigid Gas Permeable Contact Lenses)

  • 김덕훈
    • 한국안광학회지
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    • 제3권1호
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    • pp.259-262
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    • 1998
  • RGP 콘택트렌즈의 전방과 후방 표면에 대한 것을 주사전자현미경을 이용해서 조사하였다. 그 결과 렌즈의 미세구조에 대한 것은 전면과 후방면에 약간의 차이가 있음을 알 수 있었다. 표면의 거칠음정도는 후방표면보다 전방 표면이 약간 심하게 나타났다. 이런 현상은 아마도 콘택트렌즈의 재료의 특성이라 여겨진다. 한편 전방과 후방 표면의 형태적인 차이인 계곡과 선상은 약간 다르게 나타났다. 이 같은 현상은 렌즈의 제조과정에서 생긴 것으로 생각된다. 그러나 각 표면의 구형의 다양한 입자들은 아마도 렌즈의 제조과정에서 형성된 이물질이라 여겨진다.

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Kurtosis를 고려한 3차원 거친 표면의 탄성 접촉 해석 (The Elastic Contact Analysis of 3D Rough Surface including the Kurtosis)

  • 김태완;강민호;구영필;조용주
    • 한국윤활학회:학술대회논문집
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    • 한국윤활학회 2000년도 제31회 춘계학술대회
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    • pp.34-41
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    • 2000
  • Surface roughness plays a significant role in friction, wear, and lubrication in machine components. Most engineering surfaces have the nongaussian distrubution. So, in this study, contact simulation are conducted for not only gaussian surfaces but also nongaussian surfaces. Nongaussian rough surface censidering the kurtosis is generated numerically, And the effects of kurtosis on real contact area fraction, average gap, and mean asperity contact pressure are studied. It will be shown that the real contact area fraction and the mean asperity contact pressure are sensitive to the characteristics of surface geometry according to kurtosis.

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전기접촉저항에 관한 접촉통계치의 영향 (Effect of Contact Statistics on Electrical Contact Resistance)

  • 장용훈
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2003년도 추계학술대회
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    • pp.1080-1085
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    • 2003
  • The flow of electrical current through a microscopic actual contact spot between two conductors is influenced by the flow through adjacent contact spots. A smoothed version of this interaction effect is developed and used to predict the contact resistance when the statistical size and spatial distribution of contact spots is known. To illustrate the use of the method, an idealized fractal rough surface is defined using the random midpoint displacement algorithm and the size distribution of contact spots is assumed to be given by the intersection of this surface with a constant height plane. With these assumptions, it is shown that including finer scale detail in the fractal surface, equivalent to reducing the sampling length in the measurement of the surface, causes the predicted resistance to approach the perfect contact limit.

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