http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
허선철(SunChul Huh),이광영(KwangYoung Lee),박원조(WonJo Park),김병화(ByungHwa Kim),정군석(GunSug Jung) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Wings for defense industry such as fighters, missiles, and rockets should have no deformation or damage on the structure, strength, and hardness safety of constituted pared and the structures near to the bodies. The structures of existing wings had holes for light weight and plates and frames were fixed with rivets or screws, thus, there were difficulties and limits in light weight. In this study, an improvement was made in current joint methods through EB welding and laser welding for light weight of wings and welding strength was measured through strength test. In addition, finite element analysis was performed for welding process so as to induce optimum welding condition.
허선철(Sunchul Huh),박영철(Youngchul Park),이동화(Donghwa Lce) 한국자동차공학회 2004 한국 자동차공학회논문집 Vol.12 No.3
In plastic working, as working becomes speedy, automatic and working condition deteriorates, the increase of forging working has been remarkable. Therefore, we need the estimation of mold life in detail, in order to counterplan of effective mold life extension. In this study, on the SKH51, mold steel which is forged by cold working and the KCW1, tool steel of low alloy, wc estimated mold life on the base of FEM analysis and investigated mold life by low cycle fatigue test. Also, this paper suggested a new method of estimation of mold life.
쇼트피닝 투사 속도에 따른 Al6061-T651의 압축잔류응력 및 피로특성에 관한 연구
박성호(SungHo Park),허선철(SunChul Huh),박원조(WonJo Park) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.3
Recently, the steel parts used for automobiles and trains are required to be used under higher stress than ever before in need of the weight down. To achieve this requirement of a high strength steel, it must be necessary to decrease the inclusion contents and surface defects such as decarburization, surface roughness etc. In this study, the results of observation on the arc height, surface roughness, hardness, residual stress and fatigue life of a Al6061-T651 shot peened were obtained. Experimental results show that the increase of arc height is tremendous by shot velocity. Also shows that increase of surface roughness, hardness and compressive residual stress, fatigue life of Al6061- T651 by shot velocity.
자동차엔진용 금속기 복합재료의 피로균열거동에 관한 연구
박원조(Wonjo Park),허선철(Sunchul Huh),정재욱(Jaewoo Jung),이해우(Haewoo Lee),부명환(Myunghwan Boo) 한국자동차공학회 2003 한국 자동차공학회논문집 Vol.11 No.5
Metal matrix composites had generated a lot of interest in recent time because of their high specific strength and stiffness in specific properties. It was also highlighted as the material of frontier industry because strength, heat-resistance, corrosion-resistance and wear-resistance were superiored. In this study, the strength properties of AI18B4O33/AC4CH composites were represented mixing the binder of SiO2. It was also fabricated by squeeze casting. AI_18B_4O_33/AC4CH was fabricated at the melt temperature of 760℃, the perform temperature of 700℃ and mold temperature of200℃ under the pressure of 83.4MPa. Consequently, fatigue life was observed roughly in the order of AC4CH) nobiner) SiO_2, independently on crack propagation direction and stress ratio.<br/>
압축잔류응력이 차량용 스프링강(SUP-9)의 파괴인성에 미치는 영향
박원조(WonJo Park),김추용(ChoYong Kim),허선철(SunChul Huh),이광영(KwangYoung Lee) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, many components used in machinery industry demand lightness and high strength. The shot-peening method is used in order to improve fatigue life of spring steel(SUP-9) which is used in suspension of automobile. The compressive residual is induced in shot-peening process. This paper investigated the effect of the compressive residual stress on the fracture toughness. The test of Fracture toughness had been conducted at room temperature, high temperature(100℃, 200℃) and low temperature(-60℃, -100℃) from SUP-9 Steel was process by shot-peening. so we survey fractography of SUP-9 Steel by SEM.
항공기 구조물의 절삭 가공 변형에 따른 교정 방법에 관한 연구
안지혜(Jihye An),남상규,유운용(Yunyoong Yoo),허선철(Sunchul Huh) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.7
Residual stresses in the process of cutting aircraft structures cause product deformation and dimensional mismatch. To overcome this, we use the technique of manual modification process, which stretches a part of the workpiece according to the experience of skilled workers at the machining site. However, due to the nature of the aviation components industry, there are no established methods for modificated action due to various product types and components. Therefore, developing proofing process technologies can improve productivity, such as reducing work time. In this study, the residual stress was predicted through finite element analysis, and the tendency of the product to be modificated as a result of applying a tensile load to the deformed model was confirmed.
박성호(SungHo Park),박원조(WonJo Park),허선철(SunChul Huh),이광영(KwangYoung Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Recently, the steel material part used at the automobile and aerospace industries are require to be used lightweight parts. therefore, used material steel have to be a high stress and light, which is an indispensable condition in this field. aluminum alloy is very light and high stress. but many industries are require to more mechanical characteristic. so we need to development research about the aluminum alloy. there are many way for enhance mechanical characteristic of the aluminum alloy. we used the shot peening as way of the enhance mechanical characteristic. The wear test is one of important factors which evaluate the life of the machine. the surface conditions are measured to know the influence wear characteristics by shot peening and influence on material durability wear and friction by shot velocity. test result show the wear characteristics were increased by optimum peening condition. but the wear characteristic were decreased by under peening or overpeening condition. In this study, used a ball on disk type experiment to measure wear less and friction . shot velocity are 40㎧,50㎧ 70㎧ and used specimen are Al7075-T6 and Al6061-T651.
용접방법에 의한 유도탄용 날개구조의 경량화에 관한 연구
정해용(HaeYoung Jung),박원조(WonJo Park),허선철(SunChul Huh) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Wings for the defense industry such as fighters, missiles, and rockets should showno deformation or damage on the structure. The structures of existing wings had holes for weight reduction. The plates and frames were fixed with rivets or screws, which limited the weight reduction possible. In this study, an improvement was made in jointing methods through EB welding and laser welding. Welding strength was measured through tension testing. In addition, finite element analysis was performed for the welding process so as to deduce the optimum welding condition.
이광영(Kwangyoung Lee),박원조(Wonjo Park),허선철(Sunchul Huh) 한국자동차공학회 2002 한국 자동차공학회논문집 Vol.10 No.6
Metal matrix composites had generated a lot of interest in recent times because of significant in specific properties, it was also highlighted as the material of frontier industry because strength, heat-resistant, corrosion-resistant and wear-resistant were superiored. In recent years, the study of metal matrix composite has increased by aluminum alloy. The study is based on the tribological properties of AC4CH that is a part of the mechanical property of metal matrix composites. Metal matrix composite that is produced from matrix material AC4CH and reinforcement SiO , Al O and TiO are added to the metal matrix composite for strength so binding among the whisker can take place. Each metal matrix composite is produced using the squeeze casting method. To test for tribo a pin-on-disk machine and lubricant is used without paraffine 8.2CST at room temperature which is 40℃As the results of this study, the tribological properties of each specimen are more improved than AC4CH. The variation of coefficient resistance is more stable at the AC4CH and TiO , but the variation rates are higher at the inanimate binder.<br/>