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AL7075-T6 합금의 기계적 특성에 미치는 쇼트피닝의 효과
허정원 ( Chung-weon Hur ) 한국고등직업교육학회 2007 한국고등직업교육학회논문집 Vol.8 No.1
A17075-T6 bar specimens were treated by the shot peening to improve surface mechanical properties. We prepared three kinds of unpeened, 21nVs and 35m/s peened specimens and then hardness and tensile tests were carried out at room temperature, 1001C and 2001;. The effect of shot peening on surface hardness and tensile strength were investigated according to temperature. The surface hardness and tensile strength were getting higher by the shot peening, but the amounts of their increase were getting smaller as increasing temperature.
허정원 ( Chung-weon Hur ) 한국고등직업교육학회 2005 한국고등직업교육학회논문집 Vol.6 No.3
The rotary valve is important unit in the pneumatic conveying system. The high pressure rotary valve has been using abroad in the pneumatic conveying system. The high pressure rotary valve can be used in case of high pressure more than 2 bar in the plant for feeding powder and particle. The leakage of air between housing and blade is low to keep high pressure. A high pressure rotary valve has been developed with a lining of urethane. The high pressure rotary valve was tested for the reliability in leakage of air in case of 3 bar pressure. The result was that the leakage of air was low enough to satisfy two years of usage life.
항공기 구조물에서 FRP를 이용한 보강부재의 피로수명에 대한 연구
박원조(Won-Jo Park),허정원(Chung-Weon Hur),이광영(Kwang-Young Lee) 한국해양공학회 1997 韓國海洋工學會誌 Vol.11 No.3
A Al2024-T3 plate has been reinforced with AFRP to be a Hybrid-Composite, APAL. The fatigue life of the APAL has been investigated. The effects of bonding surface, numbers of AFRP bonded and AFRP orientation on fatigue life have been compared with Al2024-T3 plate. Fatigue life of AP AL has been remarkedly increased compared with that of Al2024-T3 plate. The fatigue life has depended on bonding surface and AFRP orientation, but no relationship could be found with numbers of AFRP laminates
허선철(SunChul Huh),박원조(WonJo Park),허정원(Chung Weon Hur) 한국자동차공학회 2001 한국 자동차공학회논문집 Vol.9 No.5
Metal matrix composites with whisker reinforcements have significant potential for demanding mechanical applications including defense, aerospace, and automotive industries. Especially, metal matrix composites, which are reinforced with aluminum borate whisker, have been used for the palt of piston head in automobile because of good specific strength and wear resistance. Aluminum alloy-based metal matrix composites with whisker reinforcements have been produced using squeeze casting method, which is kind of an infiltration method. In this study, AC4CH-based metal matrix composites with Al_18B_4O_33 reinforcement have been produced using squeeze casting method, after T6 heat treatment, we evaluated mechanical properties of matrix and MMC composite were evaluated.
고주파열처리에 의한 0.53% 탄소강의 피로균열진전 거동
전현배(Hyun-Bae Jeon),이현준(Hyun-Jun Lee),허선철(Sun-Chul Huh),허정원(Chung-Weon Hur),박원조(Won-Jo Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Recently, with the high performance and efficiency of machine, there have been required the multi-functions in various machine parts, such as the heat resistance, the abrasion resistance and the stress resistance as well as the strength. Fatigue crack growth tests were carried out to investigate the fatigue characteristics of high carbon steel (SM53C) experienced by high-frequency induction treatment. The influence of high-frequency induction treatment on fatigue limit was experimentally examined with the specialfocus on the variation of surface microstructure and the fatigue crack initiation and propagation through fractography. Also, the shape of hardening depth, hardened structure, hardness, and fatigue-fracture characteristics of SM53C composed by carbon steel are also investigated.
허정원,박원조,유재환 한국산업안전학회 2003 한국안전학회지 Vol.18 No.1
In this paper, the low cycle fatigue(LCF) life tests were carried out under waveforms of asymmetric triangle(4×10^-3 and 4×10^-5 strain rate) and hold-time(1min and 10min) in strain control. In triangular waveform, the fatigue lives of fast-slow waveforms were decreased to about 63~73% and them of slow-fast waveform were down to about 23~24% compared to them of fast-fast waveforms. The shapes of fracture surfaces were transgranular in fast-fast and fast-slow waveforms and intergranular in slow-fast ones. The fatigue lives of slow-fast waveforms were remarkedly shorter than them of bold-time waveforms even though cycle times of hold time waveforms were longer than them of slow-fast ones. The damage mechanisms of frature surfaces were mixed frature with both transgranular and intergranular, but intergranular fratures were r-type cavity in hold-time waveforms and w-type cavity in slow-fast ones.
J 파라미터를 이용한 고온피로균열전파 거동에 미치는 응력파형 영향의 연구
허정원,박원조 한국산업안전학회 2000 한국안전학회지 Vol.15 No.2
The fatigue crack propagation tests were performed in triangular and holding-time stress waveforms at 650℃. The behavior of fatigue crack propagation was investigated according to waveform. The analysis of high temperature fatigue crack propagation by the stress intensity factor range △K, elastic fracture mechanics parameter, was not available. The behaviors of high temperature fatigue crack propagation by the J-integral(△J_f, J' and △J_c), elasto-plastic fracture mechanics parameter, were investigated in a number of stress waveforms. The fast-fast waveform exhibited cycle-dependent(fatigue type), the slow-fast and the hold time with 500sec waveforms appear to be time-dependent(creep type) and the fast-slow and the hold time with 5, 25sec waveforms exhibited conbined behavior of both types(fatigue-creep conbined type).