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RISS 인기검색어
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- 저자 : 김영무(Young Moo Kim) (검색결과 18 건)
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몰리브데늄 분말의 치밀화 거동 및 기계적 물성의 이론적 연구
김영무,Kim, Young-Moo 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.3
In this study, consolidation behavior and hardness of commercially available molybdenum powder were investigated. In order to analyze compaction response of the powders, the elastoplastic constitutive equation based on the yield function by Shima and Oyane was applied to predict the compact density under uniaxial pressure from 100MPa to 700MPa. The compacts were sintered at $1400-1600^{\circ}C$ for 20-60 min. The sintered density and grain size of molybdenum were increased with increasing the compacting pressure and processing temperature and time. The constitutive equation, proposed by Kwon and Kim, was applied to simulate the creep densification rate and grain growth of molybdenum powder compacts. The calculated results were compared with experimental data for the powders. The effects of the porosity and grain size on the hardness of the specimens were explained based on the modified plasticity theory of porous material and Hall-Petch type equation.
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김영무,김은표,이성,노준웅,Kim, Young-Moo,Kim, Eun-Pyo,Lee, Seong,Noh, Joon-Woong 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.4
이상에서 살펴본 바와 같이, 내열재료들은 고밀도를 이용하여 비행하는 물체의 운동에너지를 극대화 시킬 수 있기 때문에 군사적으로 각종 무기체계의 성능 향상에 매우 중요하다. 또한 유도 무기 및 항공기의 경우 고온, 고압 등의 환경에서 운용되기 때문에, 이러한 조건에서 견딜 수 있는 소재 개발이 필수적이다. 따라서 무기 선진국에서는 고밀도 재료인 텅스텐, 몰리브덴, 탄탈륨, 텅스텐-구리 감손우라늄을 활용하기 위한 연구를 활발하게 진행하고 있다. 이중, 텅스텐, 몰리브덴, 텅스텐-구리 라이너에 관한 연구는 괄목할 만한 연구 성과를 거두고 있다. 이러한 연구성과는 기존 탄의 관통 성능을 크게 증가시켜, 이에 대응하고자 하는 방어 체계 연구자들을 바쁘게 할 것으로 판단된다. 한편 내열 금속의 경우, 초고온 및 고압과 같은 극한 환경에서의 고온 강도 및 내삭마성이 우수하기 때문에, 각종 유도 무기 체계의 구성 부품, 즉 터빈, 밸브, 노즐, 제트 베인 등에 적용되고 있으나 대부분의 내열 재료들은 제조 방법이 까다롭고, 가공성이 나쁘며, 고가라는 단점들이 있어 이를 극복하는 연구들이 현재 진행 중에 있다.
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변형지도 모델링을 통한 몰리브데늄의 고온 변형에 따른 미세조직 변화 연구
김영무,이성호,이성,노준웅,Kim, Young-Moo,Lee, Sung-Ho,Lee, Seong,Noh, Joon-Woong 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.6
The hot deformation characteristics of pure molybdenum was investigated in the temperature range of $600{\sim}1200^{\circ}C$ and strain rate range of $0.01{\sim}10.0/s$ using a Gleeble test machine. The power dissipation map for hot working was developed on the basis of the Dynamic Materials Model. According to the map, dynamic recrystallization (DRX) occurs in the temperature range of $1000{\sim}1100^{\circ}C$ and the strain rate range of $0.01{\sim}10.0/s$, which are the optimum conditions for hot working of this material. The average grain size after DRX is $5{\mu}m$. The material undergoes flow instabilities at temperatures of $900{\sim}1200^{\circ}C$ and the strain rates of $0.01{\sim}10.0/s$, as calculated by the continuum instability criterion.
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휠체어농구 동호인들의 여가제약 극복노력이 여가참여 제약에 미치는 영향
김영무 ( Kim Young-moo ),한민규 ( Han Min-kyu ) 한국체육대학교 체육과학연구소 2020 스포츠사이언스 Vol.38 No.2
This study was to investigate the effect of overcoming leisure restrictions can affect leisure participation in wheelchair basketball club members. The purpose of this study was to provide basic data to find ways to improve participation in leisure activities and reduce restrictions on the participation of people with disabilities who are participating in sports activities. The subject of the study used a total of 92 survey responses from wheelchair basketball club members who participate in 2020. As analysis methods, frequency analysis, exploratory factor analysis, and reliability analysis, t-validation, one-way ANOVA, and simple linear regression analysis were performed and results of these methods and procedures were as follows. First, according to demographic characteristics, extrinsic restrictions showed statistically significant differences according to housing status, region, health status, and participation time. While intrinsic restrictions showed significant differences according to housing status, region, occupation, income, and health status. Also, there were statistically significant differences according to housing status, region, occupation, income, health status, frequency of participation, and participation time. Second, the effort to overcome leisure restriction showed a significant effect on the restriction on leisure participation and as the effort to overcome the leisure restriction increases, the restriction on leisure participation decreases.
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변형지도 모델링을 통한 구리 분말 소결체의 고온 변형에 따른 미세조직 연구
장수호,김영무,박경채,Chang, Soo-Ho,Kim, Young-Moo,Park, Kyung-Chae 한국분말야금학회 2012 한국분말재료학회지 (KPMI) Vol.19 No.2
P/M coppers are subjected to the isothermal compression tests at the strain rate ranging from 0.01 to 10.0 $s^{-1}$ and the temperature from 200 to $800^{\circ}C$. The processing map reveals the dynamic recrystallization (DRX) domain in the following temperature and strain rate ranges: $600-800^{\circ}C$ and 0.01-10.0 $s^{-1}$, respectively. In the domain, the region at temperature of $600^{\circ}C$ and strain rate of $10^{-2}s^{-1}$ shows peak efficiency. From the kinetic analysis, the apparent activation energy in the DRX domain is 190.67 kJ/mol and it suggests that lattice self-diffusion is the rate controlling mechanism.
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