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선박용 calorifier의 고장모드에 대한 가속수명시험
이덕보(D. B. LEE),김정현(J. H. KIM),강수근(S. K. KANG),강영복(Y. B. KANG),김형삼(H. S. KIM) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Basic function of calorifier system is to supply warm water to the vessel. The heater used in the calorifier system plays a very important role in its reliability. The failure mechanism of heater are compared with accelerated life test. The main cause of failed heater is pitting corrosion occurred between the surface of heater and spacer. To prevent the corrosion failure from heater, material of spacer replaces metal(SUS 304) with polymer(Acryl). The life of redesigned heater can guarantee 2.47years of B10 life under the worst condition.
유동수(D. S. Ryu),임재훈(J. H. Lim),우성우(S. W. Woo),이덕보(D. B. Lee) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The data of failed product in marketplace is very important one which understands the use environment of customer. To improve reliability of the product, the failure analysis of the product should be performed. In this study, we investigate the failure mode of helix ice dispenser in side by side refrigerator. To perform failure reproduce examination of helix ice dispenser, accelerative life test(ALT) was adopted. The result of ALT was identical with failure of the helix in marketplace. The cause of failure in helix ice dispenser was cracked and fractured by helix upper made of polycarbonate. The design of helix upper and blade dispenser was modified. The helix dispenser with new design could guarantee 14.8 years of B₁ life under worst conditions.
운전조건에 따른 D . I . 디젤기관의 분무 · 화염의 특성에 관한 연구 ( 배경산란광그림자 사진법에 의한 해석 )
라진홍(J. H. Ra),이덕보(D. B. Lee),안수길(S. K. Ahn) 한국자동차공학회 1995 한국 자동차공학회논문집 Vol.3 No.6
Optically accessible D. I. diesel engine with a rectangular combustion chamber was constructed to visualize the behaviors of sprays and flames in the combustion camber with the close conditions of pressure and temperature in an actual engine. The behaviors of sprays and flames in the combustion chamber as the operating conditions of this engine were photographed with high speed camera by Diffused Background Illumination Method.<br/> With photographs taken by this method, behavior of spray droplets injected into the combustion chamber, ignition points, and flame propagation were observed and analyzed at a time-and space-dependent fashion.
이덕보(D. B. Lee),김정현(J. H. Kim),강수근(S. K. Kang),김상도(S. D. Kim),장석원(S. W. Chang),임재훈(J. H. Lim),유동수(D. S. Ryu) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In evaluation of electronic reliability on the PCB(Printed Circuit Board),electrochemical migration is one of main test objects. The phenomenon of electrochemical migration occurs in the environment of the high humidity and the high temperature under bias through a continuous aqueous electrolyte. In this paper, the generating mechanism of electrochemical migration is investigated by using water drop acceleration test under various waters. The waters used in the water drop test are city water, distilled water and ionic water. It found that the generated velocity of electrochemical migration depended on the temperature of water and the electrolyte quantity which included in the various waters.
Water drop 가속시험에 의한 이온 마이그레이션 발생 메커니즘
이덕보(D. B. LEE),강수근(S. K. Kang),장석원(S. W. Chang),유동수(D. S. Ryu) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In evaluation of electronic reliability on the PCB(Print Circuit Borad), electrochemical migration is one of main test objects. The phenomenon of electrochemical migration occurs in the environment of the hight humidity and the hight temperature under bias through a continuous aqueous electrolyte. In this paper, the generating mechanism of electrochemical migration is investigated by using water drop acceleration test under various waters. The waters used in the water drop test are city water, distilled water and ionic water. It found that the generated velocity of electrochemical migration depended on electrolyte quantity which included in the various waters.
형광램프 필라멘트 단선의 고장분석 및 내구설계기술에 관한 연구
이덕보(D. B. LEE),김정현(J. H. Kim),장석원(S. W. Chang),유동수(D. S. Ryu) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The opening test of a filament is very important for the reliability of fluorescent lamps. Two types of accelerated stress tests are performed using fluorescent lamps(FL20SD/18) made in various companies. Failure mechanisms of filament in fluorescent lamps are investigated by the filament accelerated stress test and voltage accelerated stress test. Their characteristics are compared field data with accelerated stress test data. The failure sites of filament in fluorescent lamp were occurred at the middle part of filament due to radiant heat and the edge part of filament due to torsional stress caused by thermal stress. In the case of accelerated stress test, the filament accelerated stress test is better than the voltage accelerated stress test for the □reappearance of opening test in the filament.
이덕보(D. B. LEE),장석원(S. W. Chang),유동수(D. S. Ryu) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Surface design of dental post materials improves adhesive force between a post and a root dentin and has significant influences on the reliability in endodontically treated tooth. To investigate relationship between the design of shape and the strength of material, dental posts made of nickel-chromium alloy were prepared. Three-point bending test was performed using the post material, which is utilized actually in teeth treatment. The fracture surface of specimen was examined by Scanning Electron Microscope(SEM) through failure analysis. Based on experimental results, the numerical analysis was simulated using ABAQUS, one of commercial software. The bending strength of modified post material model is higher than that of custom post material model. The modified design of the dental post material was also proposed.