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RISS 인기검색어
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- 저자 : 최우성(W. S. Choi) (검색결과 13 건)
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브리지 및 원형 금 박막의 기계적 물성 및 계면파괴인성치 측정
최우성(W.S. Choi),최승태(S.T. Choi),손상욱(S.U. Son),이승섭(S.S. Lee),양세영(S.Y. Yang),엄윤용(Y.Y. Earmme) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In order to measure the mechanical properties of gold films on Si substrate, two types of specimens, i.e., bridged films and circular membranes, are manufactured. Using the wedge tip, the bridged films are indented so that the bridged gold films are pushed off, which is called as V-peel test. The load-deflection curves obtained by the V-peel tests are analyzed with the concept of geometrically nonlinear beam by using the minimum potential energy theory together with Ritz method. Young’s modulus and residual stress of the bridged gold films are obtained. Blister test is also conducted to measure the Young’s modulus and residual stress of the circular membrane specimens, of which deformation is measured by Twyman-green interferometer. By gradually increasing the applied pressure in the blister test, the interfacial fracture toughness between the gold film and Si substrate is measured.
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최우성(W.S. Choi),김봉수(B.S. Kim),김범신(B.S. Kim),송기욱(G.W. Song) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Fossil power plants are requested to be more efficient and reliable for longer operation against frequent start-ups and load changes, recently. To aid utilities in this endeavor, various technologies have been developed that provide a systematic approach to life assessment of critical facilities. Steam turbine facilities such as turbine rotor, inner casing, especially, may suffer from more severe creep and fatigue damage under high temperature and high pressure conditions. However, until now, to evaluate remaining life of turbine facilities, qualitative / semi-quantitative analysis is carried out without standard guideline or procedure in Korea. In this paper, the procedure for assessing the life consumption of turbine facilities is proposed based on creep and fatigue, generally accepted as dominant damage mechanisms of turbine facilities. According to the standard procedure, more reliable life assessment of turbine facilities and more effective maintenance can be possible.
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최우성(W.S. Choi),윤완노(W.N. Yun),강명수(M.S. Kang) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
A gas turbine is called a combustion turbine and has an upstream compressor coupled to a downstream turbine, and a combustion chamber. Several cracks were oftenly observed at flange area between compressor casing and turbine casing in case of Westinghouse 501F series gas turbine. This component was made 1Cr1Mo0.25V steel such as conventional steam turbine casing. In this study, heat transfer and stress analysis using finite element analysis was performed in order to identify causes of flange cracking failure. Also, repairing method for effective maintenance was proposed.
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