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3차원 자체접촉을 위한 유한요소해석에 의한 등속조인트 고무부트의 변형해석
이형욱,김세호,이충호,허훈,이종화,오승탁,Lee, H.W.,Kim, S.H.,Lee, C.H.,Huh, H.,Lee, J.H.,Oh, S.T. 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.12
A finite element code is developed for 3-D self-contact problems, using continuum elements with a SRI(Selective Reduced Integration) scheme to prevent locking phenomenon by the incompressibility of rubber. Contact treatment is carried out in two ways : using the displacement constraints in case of rigid contact ; and imposing the same contact forces on two contact boundaries in case of self-contact. The finite element code developed is applied to the deformation analysis of C.V.joint boots which maintain lubrication conditions and protect the C.V.joint assembly from impact and dust. The boot accompanies large rotation depending on the rotation of the wheel axis and leading to the self-contact phenomena of the boot bellows. Since this contact phenomenon causes wear of the product and has great influence on the endurance life of the product, it is indispensable to carry out stress analysis of the rubber boots. In case of self-contact, various methods for determining contact forces have been suggested with an appropriate contact formulation. Especially, the types of penetration in self-contact are modularized to accelerate conputation with a contact algorithm.
해석요소 선택에 따른 주철제 맨홀 및 틀의 구조해석기법
이형욱(H. W. Lee),박근영(G. Y. Park),김덕원(D. W. Kim),김명호(M. H. Kim),김승중(S. J. Kim) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.10
Manholes are constructed on road in order to maintain water and sewage pipelines as an entering gate for related persons. Recently locking devices of a manhole have been developed to prevent lost or stolen of the manhole. In this study, stress analysis of a cast-iron manhole was carried out as a part of the lightweight design. Stress analysis according to the solid elements selection was conducted to search a proper the tetra element for applying to complicated geometry model. Maximum stress, the deflection at the center, and stress distribution were considered as main factors in the comparison. The result of the normal second-order tetra element(C3D10) was similar to that of the first-order hex element with incompatible mode(C3D8I) in this case.
이형욱(H.W. Lee),박성준(S.J. Park),김정배(J.B. Kim),이혜진(H.J. Lee),송정한(J.H. Song),최석우(S. Choi) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
Micro cross rolling forming on the shaft of the fluid dynamic bearing occurs the depth gradient along the groove face. The depth in the outlet part is greater than that in the inlet part. This is better than the contrary case in view point of fluid flow from fluid analysis results. In the contrary case, the eddy flow appeared in the inlet channel part as compared with the other case.