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티타늄 합금판재(Ti-6Al-4V)의 고온 소성변형특성(1)
박진기(J. G. Park),김정한(J. H. Kim),박노광(N. K. Park),김영석(Y. S. Kim) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
Titanium alloy sheets have excellent specific strength and corrosion resistance as well as good performance at high temperature. Recently, titanium alloys are widely employed not only aerospace parts but also bio prothesis and motorcycle However, due to the low formability and large spring back at room temperature, titanium alloy sheets were usually formed by slow forming or hot forming with heating die and specimen. in the sheet metal forming area, FE simulation technique to optimize forming process is widely used. To achieve high accuracy FE simulation results, Identification of material properties and deformation characteristic such as yield function are very important. In this study, uniaxial tensile and biaxial tensile test of Ti-6Al-4V alloy sheet with thickness of 1.0mm were performed at elevated temperature of 873K. Biaxial tensile tests with cruciform specimen were performed until the specimen was breakdown to characterize the yield locus of Ti-6Al-4V alloy sheet. The experimental results for yield locus are compared with the theoretical predictions based on Von Mises, Hill, Logan-Hosford, and Balat’s model. Among these Logan-Hosford’s yield criterion well predicts the experimental results.
무전극형광램프 ULTRA 150W용 EMI 필터에 대한 연구
박석인(S. Park),한수빈(S. Han),유승원(S. Yu),송유진(Y Song),정학근(H. Jeong),정봉만(B Jung) 한국조명·전기설비학회 2006 한국조명·전기설비학회 학술대회논문집 Vol.2006 No.5월
Offline switching power supplies have high voltage and high current switching waveforms that generate Electromagnetic Interference(EMI) in the form of both conducted and radiated emissions. Consequently, all off-line power supplies must be designed to attenuate or suppress EMI emissions below commonly acceptable limits. Electrodeless fluorescent lamp"s ballasts have AC/DC flyback converter, so we must control the EMI emissions.
Ventilated Disk Brake의 피로 수명 해석
박재실(J. S. Park),이영훈(Y. H. Lee),석창성(C. S. Seok),김성호(S. H. Kim),이동근(D. G. Lee) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.3
Brakes in cars and trucks are safety parts. Requirements not only in performance but also in comfort, serviceability and working lifetime are high and rising. In this study, we used the ventilated disk brake in 11 ton-bus. Mechanical stress analysis and thermal stress analysis were performed using ABAQUS software. Especially, characteristics of the rotor were analyzed in considering deceleration, initial temperature and intial velocity of brake. And tensile test and fatigue test were performed on those of brake. Form the comparing the results of experiment and FEM analysis, the standard for durability of brake was presented.