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RISS 인기검색어
- 검색키워드
- 저자 : 전승경(S. G. Jeon) (검색결과 15 건)
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전승경(S. G. Jeon),황정호(J.H. Hwang),나정기(J.G. Na),김준형(J. H. Kim),김현식(H. S. Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
If we try tensile test of rubber, stress-strain relation has actually hysterisis mechanism. In other words, if a visco-elastic material at rest is suddenly subjected to a constant strain rate. the stress will increase gradually to approach asymptotically the exact value. We call its time dependent quality as visco-elasticity, the material as visco-elastic material. Rubber has nonlinear hyper visco-elastic characteristics. So, the purpose of this paper is, first, to clarify the characteristics of stress relaxation in swaging process during hose manufacturing, and second, to analyze the relationship between cycling stress by brake motion due to the repeated steering motion and stress relaxation, and finally, to get the technology of forecasting the life expectation period of rubber brake hose by visco-elasticity point of view. This paper presents theoretic analysis of visco-elasticity and stress relaxation. With test results, we could get the property of visco-elasticity. Using the material properties and numerical computer simulation, we find out the result of visco-elastic characteristics of rubber and braided yam rubber hose. This visco-elastic analysis technology can help predict the life cycle of rubber hose. We are going to do this research further. The result will be helpful to design good brake hose scientifically. which help good brake system design.
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파이프 굽힘가공에 따른 잔류응력 분포파악 및 편평률 개선에 대한 해석적 접근
전승경(S.-G. Jeon),이정환(J.-H. Lee),김준형(J.-H. Kim),김현식(H.-S. Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
For use of automobile parts, steel or aluminum pipe were used. But this pipe always undergoes bending process. So, plastic deformation and shape deformation of circular section occurs whenever pipe is bended. Residual stress causes fatigue failure of pipe. It causes severe problem of vehicle movement. Actually many accidents occurred in field by this problems. But little researches have been studied about residual stress and circular Deformation Rate of pipe bending procedure. So this paper evaluates this problem by parametric analytic model study. And to prove analytical result, real test results of pipe bending will also be appended to later paper. In this paper a number of studies conducted on the pipe bending procedure improvement. For the sensitivity analysis on effect of pipe residual stress, bending radius, diameter and thickness of pipe and modulus of material and other parameters were discussed. And finally we forecast reformation of pipe bending procedure only analytically.
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전승경(S. G. Jeon),최진국(J. G. Choi),김준형(J. H. Kim),김현식(H. S. Kim),우창수(C. S. Woo) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Automobile brake system mainly consists of booster and calipers with pad and shoes where working oil flows. Brake system decreases rotating energy of wheel by thrusting hydraulic power piston into caliper and causing friction between rotating disk and caliper. Brake hoses of automobile can not avoid fluctuating deformation due to relative displacement between hose and caliper by bumping, cornering, braking, going through repeating stress due to complicate displacement by bending, twisting and tension. Therefore, layout design of brake hose for vehicle motion must be considered in early design stages. Moreover, the increased temperature of working oil due to the larger size and additional faculty of automobile recently has caused early aging of brake hose, leakage of oil, and change of braking efforts. So the endurance of hose property is very importance for the design of brake system. This paper presents technology of motion analysis of brake hose using nonlinear structural dynamics. To present material property of rubber, we carried out many kinds of material test and loading test of the final product like bending, elongation at break, torsion and so on. Effects of inner oil pressure and temperature were also considered at each test. The rebar element represents braided yarn in the middle of rubber hose. There are also presented experimental stress and strain results of rubber hose surface by E.S.P.I equipment. We compared these numerical and test results, and finally evaluated nonlinear characteristics of brake hose. This technology of numerical analysis of rubber brake hose can help predict the life cycle of rubber hose. We are going to do this research further. As a result, it will be possible to design brake hose layout scientifically, which help good brake system design.
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파이프 굽힘가공 부위의 잔류응력 측정에 대한 실험적 연구
전승경(S.G.Jeon),김준형(J.H.Kim),신재윤(J.Y.Shim),이상걸(S.G.Lee) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
For automobile parts, steel of aluminum pipe is used. But this pipe always undergoes bending process. So, plastic deformation and shape deformation of circular section occur whenever pipe is bended. This causes residual stress and result in fatigue failure of pipe. It causes severe problem of vehicle movement. Actually many accidents occurred in field by this problems. But little researches have been studies about residual stress and circular deformation rate of pipe bending procedure. So this paper evaluates numerical values by X-ray diffractometer test. A number of studies have been conducted on the pipe bending procedure test. For the sensitivity analysis on effect of pipe residual stress, bending radius, diameter and thickness of pipe and modulus of material were discussed. And finally we forecast reformation of pipe bending procedure experimentally.
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압력손실을 고려한 자동차용 유체관로의 최적설계에 관한 연구
전승경(S.G.Jeon),이규호(G.H.Lee),김준형(J.H.Kim),이정환(J.H.Lee),황호준(H.G.Hwang) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
For automobile parts, steel or aluminum pipe is bent in various shapes according to vehicle layout. Plastic deformation of circular section, however, occurs whenever pipe is bent. This causes pressure drop when fluid flows through inside of pipe, It makes both performance of vehicle movement and fuel consumption rate worse. But few researches have been studied about the relation of pressure drop and circular deformation rate. So a number of studies have been conducted on bent pipe to see the relation those parameters. Also numerical analysis (F.V.M) has been conducted and compared with pressure drop test. For the sensitivity analysis of bent pipe, various parameters, such as bending radius, diameter and thickness of pipe and modulus of material were analyzed. We could find the influence of bent pipe on vehicle performance, which leads to good hydraulic wiring design.
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엘라스토머 사출성형시 CAE 유동해석과 실제 성형품의 비교
한성렬(S. R. Han),김준형(J. H. Kim),전승경(S. G. Jeon),이규호(G. H. Lee),정영득(Y. D. Jeong) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
Thermoplastic elastomer(TPE) can be molded by conventional injection molding. Therefore TPE injection molding could be analyzed by commercial flow analysis software. However there are a little of gaps on CAE simulation results and practical molding. In this study, the properties of TPE were measured and applied to CAE simulation for comparing the simulation flow pattern and real flow pattern. The pattern that was controlled by injection time was match. The pattern that was controlled by injection stroke and rate was not match.
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