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정효진(Hyojin Jung),오환섭(Hwansup Oh),허민구(ngu Hur),박철희(Chulhee Park) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
At this research, we examined continuous life span as a probability by the 'temperature changes experiment' of an automobile tungsten filamenet which is considered creep character, facture behavior for material of small amount surface and evaluation of life span as well as prediction. As a result, we confirmed relation ship between the temperature of filament and the continuity span of life and examined the facture mechanism.
윤재형(Jaehyung Yun),오환섭(Hwansup Oh) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In this study, grain size of ferrite and size of grain in SM20C were changed after preprocessing with 920℃ and 1150℃. Two specimens with different grain size gained Martensite in case-hardening layer through high frequency surface heat treatment. Other specimens(920℃,1150℃ heat treatment) that Ferrite and Pearlite’s grain size and composition of metallic structure are different were used to watch fracture behavior depending on size of grain and composite grain. A ferrite’s grain framed in some martensite’s grain has residual stress. in other words residual stress was made from composite grain like martensite. and residual stress influenced fracture behavior. So, this study investigated of the fracture behavior from A grain included residual stress from composite grain, grain size.
박상필(Sangpil Park),오환섭(Hwansup Oh),허민구(Mingu Hur) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study, we analysis a cemented mirror for 3 mount material in steady - state using 'Finite elements analysis' for the purpose of making the cemented mirror of Lyman- solar telescope which is main payload of the STSAT-2 that is planned to blastoff the latter half of the year in 2005, be the minimum thermal stress and thermal transformation. we assume just two cases of temperature changes, which are worst cold case and worst hot case, according to an orbit character of satellite. As a result, the stress and transformation on commissure caused by the difference of the coefficient of thermal expansion is inquired out in order of Al-6063-T6, Ti-6AI-4V, SuperInvar besides stress on commissure and displacement of out 'of commissure is the maximum. Consequently It is safe to use Invar-fraction, But In the case of using AI-6063- T6 for satisfying mass requirement, is required more effectively thermal control system.
박상필,오환섭,박종찬,박철희 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
At this research, we examined probability of light bulb's life span value and prediction on purpose to inquire out the span of repeat velocity as fracture probobility by executing the fatigue test, which is considered property of Tungsten filament's thermal fatigue used as an automobile bulb. As a result, we can confirm what the most suitable solution is weibull distribution and log normal distribution. Tungsten filament's span gets longer as the fatigue repeat velocity gets shorter. And, repeat span is about 15%~40% shorter than sequence life span.