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Numerical Study of Residual Stress-Strain and Fatigue Life of Rolling Contact
B. Bhandari,J. Yang(양진승) 한국트라이볼로지학회 2008 한국트라이볼로지학회 학술대회 Vol.2008 No.11
Subsurface stress distribution is of primary importance for understanding the development of Rolling Contact Fatigue (RCF) and crack growth. Many earlier finite element rolling contact simulation have not produced accurate results of shear strain accumulation because the plasticity models were not designed to do so. In this paper, we studied the residual stresses and progressive shear strain ratcheting for the line rolling contact problems for various P?/k and the Q/P ratios, where P? is the maximum Hertzian pressure, k is the yield stress in shear of the material, Q represents the total tangential forces and P is the total normal load. Simulations are done for ISO 1070 steel which is dominantly used in rails. It has been seen that the ratcheting rate of rolling surface movement rapidly decreases with increasing number of rolling passages (cycles). The analysis focuses only on the driving wheel where Q/P is positive. The result shows that the tangential force plays a considerable role in the surface ratcheting but its influence on the residual stresses is insignificant. The overall residual stresses are mainly determined by the P?/k ratios. Finally this paper summarizes the fatigue life for different P?/k ratios and compares and contrasts their influence on the life of the rolling contact in the fatigue initiation region. In this paper, the effect of various P?/k on the fatigue life are examined and compared.
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전종균(Chun, C.K.),양진승(Yang, J.S.),박삼진(Park, S.J.),이규세(Yi, G.S.),마양수(Ma, Y.S.) 한국산학기술학회 2006 한국산학기술학회논문지 Vol.7 No.6
철도차량의 차륜에서 발생하는 크랙은 표면으로부터 개시하는 표면크랙, 내부에서 개시하는 내부크랙으로 나눌 수 있고, 이들 크랙은 철도의 안전운행에 위험요소가 된다. 그러므로 이들 크랙의 성장수명 판단은 매우 중요하다. 본 연구에서는 철도차륜의 표면크랙 및 내부크랙의 응력분포상태, 변위 및 성장수명을 연구하였다. 특히 내부 및 표면크랙에 대해 유한요소해석을 실시하여 크랙선단의 응력상태, 변위, 응력확대계수를 찾아내었고, 이를 바탕으로 Paris 공식을 사용하여 성장수명을 예측하였다. The crack that occurs on the wheels of railroad cars can be categorized into a surface crack that starts from the surface or a subsurface crack that starts from the inside and can be detrimental to safe railroad operations. Therefore, estimating the growth life span of this type of crack is very important. In this research, the stress distributions, displacements, and the growth-life spans of both surface cracks and subsurface cracks have been studied. By using the finite element analysis, especially in the life span prediction process, the stress conditions and the stress intensity factors of the crack tip have been discovered. The Paris formula has been used to analyze the growth-life span prediction.
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이해철(H.C.Lee),이민호(M.H.Lee),이준서(J.S.Lee),한경(K.Han),양진승(J.S.Yang),차경옥(K.O.Cha) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
In automobile exhaust system, internal pulsating pressure and shell vibration greatly affect the exhaust noise and the surface radiated noise. This noise is emitted from the tailpipe outlet and the muffler outer wall due to the pulsation of the exhaust gas pressure. This paper describes an analytical study of these characteristics as influenced by exhaust system structure. An exhaust system simulator was used for generating the pressure pulsation. The relationship between pulsating pressure and exhaust noise was analyzed. The relationship between shell vibration and surface radiated noise was also identified by finding FRF.<br/>
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機關 排氣系에서 非正常 가스流動의 壓力波豫測에 關한 硏究
李珉湖,梁振承,車京玉 明知大學校 産業技術硏究所 1998 産業技術硏究所論文集 Vol.17 No.-
This paper describes a theoretical and experimental investigation of the pressure-time histories of some basic internal combustion engine exhaust systems. The program package is utilized the method of characteristics to solve the general equations of one-dimensional unsteady gas flow. This analysis is then combined with boundary models, based on quasi-steady flow approach, to give a complete treatment of the flow behavior in the exhaust system. Using a rotary valve simulator, experimental pressure-time were obtained. The predictions are compared with measured results and show a high degree of correlation in amplitude and phasing.
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