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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.
마이크로 헤링본 패턴 점진성형공정의 해석 및 실험적 연구
송정한(J. H. Song),이혜진(H. J. Lee),박진호(J. Park),이율(Y. Lee),최석우(S. Choi),이형욱(H. W. LEe) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
In this paper, the forming process for the herringbone pattern is conducted through a finite element simulation and experimental verification. The investigated parameters from the analysis are the variation of groove depth, forming load, and amount of the elastic recovery in elasto-plastic micro forming. Analysis result demonstrates that the groove was uniformly shaped with depth of 3㎛ considering the elastic recovery except the tip area. The simulation result is coinciding with experimental one. This result reveals that the incremental forming can be utilized to make the herringbone pattern on the bearing shaft.
마이크로 스크류 성형해석을 위한 소재의 유동응력 모델 고찰
송전한(J. H. Song),이근안(G. A. Lee),이혜진(H. J. Lee),이낙규(N. K. Lee),박기동(K. D. Park),이형욱(H. W. Lee) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
This paper deals with the typical evaluation of hardening models of ANSI410 stainless steels for the thread rolling simulation of micro-screws. Comparison tests of the material were firstly carried out in order to obtain the stress-strain curves. The curves were then interpolated with Ludwick equation and Hockett-Sherby equation. Interpolation results indicates that Hockett-Sherby model provide relatively well description for the hardening behavior of ANSI 410 steel. Both simulations and experiments were finally conducted to verity the hardening equation. The results fully demonstrate that Hockett-Sherby model is more suitable for the FE simulation of thread rolling process for ANSI 410 micro-screws.