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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.
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.
쇼트피닝에 의한 알루미늄합금의 피로균열진전 거동에 관한 연구
박성호(SungHo Park),박원조(WonJo Park),허선철(SunChul Huh) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Nowadays, many components used in aerospace and automobile industry were required lightness and high strength. The shot peening process is most often used to improve fatigue properties of metal part. The shot peening method is in used in order to improve the fatigue life of Aluminum alloy which is used in aerospace and automobile industries. The compressive residual stress is induced in this shot peening process. This paper is investigated the effect of the compressive residual stress on the fatigue crack growth characteristics and we found the optimum shot peening condition. Test results show the fatigue characteristics were increased by optimum peening condition. But the fatigue characteristics were decreased by under peening or over peening condition. The fatigue life and fatigue strength of shot peened specimens are higher than those of unpeened specimens. Fatigue crack growth tests on compact tension specimen of width 12.5㎜ were conducted by using sinusoidal waveform and used the Servo hydraulic fatigue testing machine (MTS 810). Compact tension specimens were used and crack growth rate da/dN and stress intensity factor range ΔK were analyzed concerning to the R value of 0.1. Shot peening was performed on velocity of 40㎧, 50㎧, 70㎧ by impeller type shot peening machine, and used compact tension 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.
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.
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.