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양원호(W. H. Yang),김홍석(H. S. Kim),현명택(M. T. Hyun),김귀식(G. S. Kim) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Air pollution from auto-vehicle exhausted gas accounts for 70% of entire air pollution in Jeju. The introduction of electric vehicles which do not generate discharge emissions will improve the clean image in Jeju and boost tour industry. Driving tests have been conducted on the 5-16 and Ilju Roads to investigate the driving characteristics of electric vehicles, using Santa Fes provided by HyunDai Motor Co. The state of charging battery decreases rapidly on the uphill road of 5-16 Road, while it shows linear decreases on the flat road of Ilju Road. It is required to improve the charging ability of battery to adopt the electrical vehicle in Jeju.
서종환(J.H. Suh),서명원(M.W. Suh),양원호(W.H. Yang) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
The joint characteristics are necessary to be determined in the early stage of the automotive structural analysis. Identification of joints in vehicle body has been researched until the recent years. In this study, the joint characteristics of vehicle structure were expressed as condensed forms from the full joint stiffness and mass matrix. The condensed joint stiffness and mass matrix were applied to typical T-type and Edge-type joints, and the usefulness was confirmed. Also, it was verified by the application to the lower B-pillar of vehicle body<br/>
[論文] 두께가 변화하는 부재 내의 혼합모드 I/Ⅲ 균열의 응력확대 계수해석-3차원 유한요소해석 중심으로-
양원호(W.H.Yang),최용식(Y.S.Choy),조명래(M.R.Cho) 한국자동차공학회 1993 오토저널 Vol.15 No.2
Variable thickness plates are commonly encountered in the majority of mechanical/structural components of industrial applications. And, as a result of the unsymmetry of the structure or the load and the anisoptropy of the materials, the cracks in engineering structures are generally subjected to combined stresses. In spite of considerable practical interest, however, a few fracture mechanics study on combined mode crack in a variable thickness plate have carried out. In this respect, combined mode<br/> I/Ⅲ stress intensity factors K₁ and K/_Ⅲ at the crack tip for a variable thickness plate were obtained by 3-dimensional finite element analysis. Variable thickness plates containing a central slant crack were chosen. the parameters used in this study were dimensionless crack length λ, crack slant angle a, thickness ratio βand width ratio ω. Stress intensity factors were calculated by crack opening displacement(COD) and crack tearing displacement(CTD) method proposed by Ingraffea and Manu. The effect of thickness ratio β on K₁ is relatively great in comparison to KⅢ.
[論文] 표면균열의 피로성장거동 연구-인장 반복 하중하에서의 균열형상비 예측-
최용식(Y.S.Choy),양원호(W.H.Yang),김영진(Y.J.Kim),김재원(J.W.Kim) 한국자동차공학회 1990 오토저널 Vol.12 No.2
The fatigue growth behavior of surface cracks cannot be adequately predicted solely by stress intensity factor analysis. This is caused by different plastic deformation due to variations in the stress field triaxiality along the crack tip. Therefore, a new model which accounts for the crack closure phenomenon is proposed in this paper to predict the fatigue crack growth patterns for surface cracks. Fatigue tests were performed to develop the new model for the prediction and to assess the accuracy of the analysis. The predicted crack growth behavior for PMMA and Aluminum alloy 7075-T6 materials agreed well with the experimental data.
STRESS INTENSITY FACTOR FOR CRACK IN A PLATE WITH VARIOUS THICKNESS
LEE, H. W.,CHOY, Y. S.,YANG, W. H.,CHANG, S. I. 경남대학교 신소재연구소 1991 論文集 Vol.1 No.-
CT형 有限幅 變厚境界에 수직한 Mode I Crack간의 SIF를 3次元 有限要素法으로 數値解析하고, 그 結果틀 變厚材의 疲勞試驗結果에 적용하여 疲勞龜裂成長擧動을 解釋한 結果,다음과 같은 結論이 導出되었다. 1. CT형 有限鑛 變厚 Model (Thin to Thick Type)의 두께비 B, 판폭비 ω 및 無次元 龜裂길이 λ를 Parameter로 설정하여 Crack-tip SIF K를 FEM으로 解析한 結果, ω>0.5 일때 판폭비의 影響은 거의 無楓할 수 있을 만큼 微小한 것으로 評價되었으며, SIF Geomeky Factor를 F_(Ⅳ)λ, β)의 형으로 定式化할 수 있었다. 2. F_(Ⅳ)( λ, β)는 대체로 λ가 커짐에 따라 점차 減少하다가, 變厚境界(λ=1) 근방에서 急減하는 樣相을 나타했으며, 그 減少 領向은 B가 클수록 減少率이 큰것으로 評價되었다. 또한 FEM 解析結果를 疲勞試驗 Data에서 추출한 無次元 SIF와 比較해 본 結果, 兩者가 定量的으로 잘 一致하였다. 3. CT형 有限幅 變厚部材에서의 疲勞龜裂成長擧動은, 初期龜裂咸長段階에서는 ΔK와da/dN이 直線的으로 增加하는 樣相을 보이다가 龜裂先端이 變厚境界 근방으로 접근함에 따라 ΔK의 減少와 더불어 da/dN의 減少를 초래하게 되고, 이와 같은 [da/dN-ΔK]의 增加 및 減少擧動은, 같은 기울기를 갖는 直線上에서 增·減되는 것으로 評價 되었다. A prerequisite for any fracture mechanics analysis of a cracked structure, is a knowledge of the stress intensity factor at the tip of the crack. In the present work, an empirical stress intensity factor solution, with an accurancy acceptable for engineering disign, is developed by using 3-dimensional finite elemnt analysis based on the fatigue crack growth behavior of variable thickness plate. Geometry factor of the stress intensity factor for various thickness specimens is introduced in the form of F_(Ⅳ) (λ, β) where λ is a dimensionless crack length and B is the thickness ratio.