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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.
An Evaluation on Preform Process and Compressive Strength of Whisker reinforcement
Huawei Rong,HyunJun Lee,SunChul Huh,WonJo Park 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Nowadays, many components in aerospace and automobile industry require lightness and high strength. And existent metal is confronted by limitation. Accordingly, there are many studies on Metal Matrix Composite (MMC) taking more excellent characteristics than existent metal material. MMC can obtain mechanical characteristics of application purposes that a single material is difficult to obtain. MMC is manufactured from preform by pressure casting. The pressure causes deformation or fault of manufactured MMC and preform. Accordingly, in order to maintain the preform shape enduring infiltration pressure, preform manufacture have to consider influence of binder and sintering temperature. This study manufactured preform by Aluminum Borate Whisker and researched effect of compressive strength on binder and sintering temperature of preform.
A study on the new high strength casting Al-Cn alloy by heat treatment and structure property
Jiang Jun,HyunJun Lee,SunChul Huh,WonJo Park 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.10
Aging and solid-solution are main methods to strengthen metal, and their optimal strengthening temperature and time are more and more drew attention to study. Al-Cu alloys are one kind of typical precipitation hardening alloy, and high strength casting Al-Cu alloy has been widely used in industry. In this study the authors use heat treatment and aging to strengthen the alloy, and then the analysis techniques such as transmission electron microscopy (TEM), scanning electron microscopy (SEM), optical metallographic examination(OM), metallographic analysis, fracture analysis and electron diffraction were employed in this dissertation.
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.
Study on Sliding Wear Characteristics and Processing of MoSi
Park, Sungho,Park, Wonjo,Huh, Sunchul Korean Society of Ocean Engineers 2012 International journal of ocean system engineering Vol.2 No.4
In this study, a monolithic MoSi2 matrix reinforced with 20 vol% SiC particles, a SiC/MoSi2 composite matrix reinforced with 20 vol% ZrO2 particles, and a ZrO2/MoSi2 composite were fabricated using hot press sintering at $1350^{\circ}C$ for 1 h under a pressure of 30 MPa. The Vickers hardness and sliding wear resistance of the monolithic MoSi2, ZrO2/MoSi2, and SiC/MoSi2 composite were investigated at room temperature. A wear behavior test was carried out using a disk-type wear tester with a silicon nitride ball. The ZrO2/MoSi2 composite showed an average Vickers hardness value and excellent wear resistance compared with the monolithic MoSi2 and SiC/MoSi2 composite at room temperature.
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.