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IP PAD용 소재의 밀도변화와 PAB 전개성능간의 연관성에 대한 연구
이희청(Heechung Lee),김진성(Jinsung Kim),박성국(Sungkuk Park),전용(Yong Chun) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
A fundamental research on density of polyurethanes (PU) and deployment of the passenger air bags(PAB) inside instrument panel was performed. Instrument Panel(IP) should not only have excellent touch feeling and good appearance, but also satisfy safety regulations because collision impact is directly transferred to drivers and/or passengers. Concerning the PU foams, many researches are performing studies to lower the density of the materials in order to improve soft touch feeling. In this study, physical properties of PU foams and deployment performance of PAB were investigated with severe different PU densities. In addition, PAB deployment was tested to examine foam fragmentation and opening time.
샤시모듈 부품 용접부 피로특성 평가 및 내구수명 상관성 연구
이희청(Heechung Lee),이우식(Woosik Lee),신헌(Shin Hun),전용(Yong Chun) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Evaluation of fatigue strength on the welded part is very important for strength design of welded steel structures. Arc -welds has been used for chassis parts. The arc-welds for chassis parts are exposed under higher stress, compared with other parts, and thus tend to cause fatigue failure. This study presents a method for determining the fatigue life of arc-welds used extensively in chassis parts. The specimens were machined for the tensile and fatigue tests. The tensile and fatigue strengths were measured. Fatigue data must be insured according to the shapes, materials, and welding conditions of the arcwelded structure. This study proposes a method for estimating the fatigue life of arc-welds, and compares test results with calculated ones. Fatigue life prediction of a lower control arm is carried out with finite element methods. The fatigue life predicted by simulations are compared with test results.
이희청(Heechung Lee),이우식(Woosik Lee),박기성(Kiseong Park),김대업(Deaup Kim) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
The weight reduction of Steering gear assay has been a major concern of automakers to make high efficiency vehicles. The application of tube contributes to reduce the weight of automotive parts and obtains the mass efficiency with excellent performance. Recently, Hollow Rack bar has been used to achieve lightweight steering gear assay. In this paper, development procedures of hollow Rack bar by SRM tube are discussed. To meet market needs, an integrated approach to optimizing structural Rack bar designs was developed. For evaluation of Steering gear assay, we have carried out function test and bending test etc. the results was considerable for our specification. The developed hollow Rack bar achieve a 25% weight reduction over a solid Rack bar
이희청(Heechung Lee),이기양(Keeyang Lee),김대업(Daeup Kim) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The application of high strength steel contribute to mass efficiency with excellent performance. And Galvannealed steel(GA) has good corrosion resistance. It's demand is rapidly increasing for automotive parts. In this study, light weight reduction of automotive chassis parts by application of hot rolled 590 Mpa grade dual phase steel which was newly developed was performed. Furthermore, Galvannealed steel is tested corrosion resistance by CCT(Cyclic Corrosion Test) with automotive steel, those welding and painting behavior were shown good performance. For checking the durability of the automotive parts adopted the developed steel, various test were carried out, and the result was compatible with the present mass production parts. The result in this study indicated that the corrosion resistance at the cross cut was improved by galvannealing of sheet steels.
용접시편 응력-수명 선도를 이용한 샤시부품의 내구수명 평가
신헌(Hun Shin),구자석(Jasuk Koo),최승렬(Seungryul Choi),안병재(Byungjae Ahn),이희청(Heechung Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Automotive chassis parts are commonly fabricated by arc welding. Severe stress concentration and low fatigue strength tend to cause fatigue crack near the weld. Thus, fatigue life estimation of the weld is very important for the durability of the chassis parts. This study presents a method for estimating the fatigue life of the weld. The fatigue life for 10 kinds of weld specimens is measured by fatigue test and structural stress at the weld is calculated by finite element analysis. The stress life curve of the weld is obtained by statistical analysis of the fatigue life and structural stress. Using the stress-life curve for the weld, fatigue life estimation of a front lower control arm is carried out by finite element analysis. The fatigue life estimated by simulation is compared with test results. It is found that the proposed stress-life curve of the weld provide a good estimation of fatigue life.