• Title/Summary/Keyword: contact effect

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Finite Element Analysis of Axisymmetric Multi-Stage Deep Drawing Processes (축대칭 다단계 디프드로잉 공정의 유한요소해석)

  • 윤정환;유동진;양동열;김석관
    • Transactions of Materials Processing
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    • v.3 no.4
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    • pp.468-481
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    • 1994

  • Mathematical description of arbitrarily-shaped tool surface are introduced by parametric patch approaches along with the related contact search algorithm. In order to maintain the advantages of membrane elements and to incoporate the bending effect, a BEAM(Bending Energy Augmented Membrane) element is proposed. Computation are carried out for some complex axisymmetric multi-stage deep drawing to verify the validity and the effectiveness of the proposed method.

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New method of optical laser extensometer

  • Noh, jiwhan
    • 제어로봇시스템학회:학술대회논문집
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    • 2002.10a
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    • pp.79.2-79
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    • 2002

  • 1. the principal of a PSD(Position Sensitive Detector) 2. the optical system of the proposed method 3. signal processing 4. experimental result A mechanical engineer experiment on the tension test. In this experiment, they use the extensometer which can measure the extended distance of material. A normal extensometer is the contact type which means that the extensometer should attached to the specimen. It is not convenient to the user. The contacting type can also effect the characteristic of the specimen. So a extensometer is changed from contacting type to non-contacting type. Non-contacting type is not necessary to attach the extensometer to the specimen...

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Effect of Plasma Treatment on Adhesion Strength between Underfill and Substrate (플라즈마 처리에 따른 언더필과 기판 사이의 접착 강도에 관한 연구)

  • No Bo-In;Jeong Seung-Bu
    • Proceedings of the KWS Conference
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    • 2006.05a
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    • pp.13-15
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    • 2006

  • The effects of plasma treatment on the surfaces of the FR-4 (Flame Resistant-4) and copper substrates are investigated in terms of X-ray photoelectron spectroscopy (XPS), contact angle, and atomic force microscopy (AFM). The adhesion strengths of the underfills/FR-4 substrate and underfills/copper substrate are also studied. As experimental results, the plasma treatments of FR-4 and copper substrate surfaces yield several oxygen complexes in hydrophilic surfaces, which can play an important role in increasing the surface polarity, wettability, and adhesion characteristics of the underfills/substrates.

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The effect of voltage lead and tape arrangements on self-field losses in a Bi-2223 tape (전압리드 및 테이프 배열이 Bi-2223테이프의 자기자계손실에 미치는 영향)

  • 박권배;류경우;최병주
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • 2000.02a
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    • pp.58-59
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    • 2000

  • The influence of voltage lead and tape arrangements on self-field losses was investigated by using a 1.5m long Bi-2223 tape. Experimental results show that the measured losses are strongly dependent on voltage lead configurations but not contact positions. The losses are independent on frequencies below critical current of the tape. It menas that the self-field losses are purely hysteretic.

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Effect of Fe content on the contact resistance of electroplated Au-Fe alloy layers (Au-Fe합금 도금층의 접촉저항에 미치는 Fe함량의 영향)

  • Park, Hyeon-Sun;Son, In-Jun
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2015.11a
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    • pp.350-350
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    • 2015

  • 본 연구는 Fe함량에 따른 Au-Fe합금 도금층의 접촉저항을 알아보는 것이 목적이다. 이를 위해 Fe함량을 다르게 하여 Au-Fe합금 도금층을 가진 시편을 제작하고 열처리를 실시한 후 접촉저항을 비교하였다. 그 결과 Fe함량이 증가할수록 접촉저항이 증가하는 것을 알 수 있었다.

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