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RISS 인기검색어
- 검색키워드
- 저자 : 안정오(Jungo An) (검색결과 4 건)
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안정오(Jungo An),강대민(Daemin Kang) 한국자동차공학회 2004 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
The apparent activation energy Qc and the applied stress exponent n, rupture life have been determined during creep of AZ3l Mg alloy over the temperature range of 200℃ to 300℃ and stress range of 2.39 kg/㎟ to 9.55 kg/㎟, respectively, in order to investigate the creep behavior. Constant load creep tests were carried out in the equipment including automatic temperature controller, whose data are sent to computer.<br/> At around the temperature of 200℃~220℃ and under the stress level of 6.37~9.55kg/㎟, and again at around the temperature of 280℃~300℃ and under the stress level of 2.39~3.98kg/㎟, the creep behavior obeyed a simple power-law relating steady state creep rate to applied stress and the activation energy for the creep deformation was nearly equal and, a little low, respectively, to that of the self diffusion of Mg alloy including aluminum.<br/> From the above facts, at around the temperature of 200℃~220℃ the creep deformation for AZ31 Mg alloy seemed to be controlled by dislocation climb but controlled by dislocation glide at 280℃~300℃.
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AZ31 마그네슘 합금의 고온 크리이프 변형특성에 관한 연구
안정오(Jungo An),강대민(Daemin Kang),구양(Yang Koo),심성보(Sungbo Sim) 한국자동차공학회 2005 한국 자동차공학회논문집 Vol.13 No.3
The apparent activation energy Qc, the applied stress exponent n, and rupture life have been determined from creep test results of AZ31 Mg alloy over the temperature range of 200℃ to 300℃ and the stress range of 23.42 M Pa to 93.59 MPa, respectively, in order to investigate the creep behavior. Constant load creep tests were carried out in the equipment including automatic temperature controller with data acquisition computer.<br/> At the temperature of 200℃-220℃ and under the stress level of 62.43-93.59 MPa, and at around the temperature of 280℃-300℃ and under the stress level of 23.42-39.00 MPa, the creep behavior obeyed a simple power-law relating steady state creep rate to applied stress and the activation energy for the creep deformation was nearly equal to that of the self diffusion of Mg alloy including aluminum<br/> From the above results, at the temperature of 200℃-220℃ the creep deformation for AZ31 Mg alloy seemed to be controlled by dislocation climb but controlled by dislocation glide at 280℃-300℃. And relationship between rupture time and stress at around the temperature of 200℃-220℃ and under the stress level of62.43-93.59 MPa, and again at around the temperature of 280℃-300℃ and under the stress level of 23.42-39.00 MPa, respectively, appeard as follow;<br/> logσ=-0.18(T+460)(logtr+21)+5.92, logσ=-0.25(T+460)(logtr+21 )+8.02<br/> Also relationship between rupture time and steady state creep rate appears as follow; Inε = -0.88lntr-2.45
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AZ31 마그네슘 합금의 고온 특성 및 크리이프 변형기구에 관한 연구
강대민(Daemin Kang),안정오(Jungo An) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Magnesium alloys have been widely used for many structural components of automobiles and aircraft because of high specific strength and good cast-ability in spite of hexagonal closed-packed crystal structure of pure magnesium. In this study, unaxial tension tests at high temperature and creep tests are done in order to investigate the characteristic of high temperature and mechanism for creep deformation of AZ31 Mg alloy. Yield stress and ultimate tensile stress decreased with increasing temperature, but elongation increased from results of uniaxial tension test at high temperature. The apparent activation energy Qc and the applied stress exponent n, rupture life have been determined during creep of AZ31 Mg alloy over the temperature range of 200℃ to 300℃ and stress range of 2.39 kgf/㎟ to 9.55 kgf/㎟, respectively, in order to investigate the creep behavior. Constant load creep tests were carried out in the equipment including automatic temperature controller, whose data are sent to computer. At around the temperature of 200℃~220℃ and under the stress level of 6.37~9.55㎏f/㎟, and again at around the temperature of 280℃~300℃ and under the stress level of 2.39~3.98kgf/㎟, the creep behavior obeyed a simple power-law relating steady state creep rate to applied stress and the activation energy for the creep deformation was nearly equal and, a little low, respectively, to that of the self diffusion of Mg alloy including aluminum. Also they were tan obtained rupture surfaces at high temperature have bigger dimples than those at lower temperature by S.E.M.
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강대민(DaeMin Kang),안승모(SeungMo Ahn),안정오(JungO An) 한국자동차공학회 2010 한국 자동차공학회논문집 Vol.18 No.3
The fatality of pedestrian accounts for about 21.2% of all fatality at 2007 year in Korea. In car to pedestrian accident it is very important to inspect the throw distance of pedestrian after collision for exact reconstructing of the accident . The variables that influence on the throw distance of pedestrian can be classified into the factors of vehicle and pedestrian, and road condition. It was simulated by PC-CRASH, a kinetic analysis program for a traffic accident in sedan type vehicle and SPSS program was used for regression analysis. From the results, the throw distance of pedestrian increased with the increasing of vehicle velocity, and decreased with the increasing of impact offset. Also it decreased with the increasing of velocity of pedestrian at accident, and throw distance at the road condition of wet was longer than that at dry condition. Finally, the regression model of sedan type vehicle on the throw distance of pedestrian was as follows; dist<SUB>i</SUB>=2.39-0.11offset<SUB>i</SUB>+0.59speed<SUB>i</SUB>-5.45height<SUB>i</SUB>-0.25walk<SUB>i</SUB>+2.78wet<SUB>i</SUB>+e<SUB>i</SUB>
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