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권영두,임범수,박철,최진민,Kwon, Y.D.,Lim, B.S.,Park, C.,Choi, J.M. 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.11
A new load/displacement parameter method is developed for the cases that loads are applied to one or more points, and displacements of a structure are controlled at one or more points sinultaneously. The procedure exploits a generalized Riks method, which utilizes load/displacement parameters as scaling factors in order to analyze the post-buckling phenomena including snap-through or snap-back. A convergence characteristic is improved by employing new relaxation factors in incremental displacement parameter, particularly at the region where exhibits severe numerical instability. The improved performance is illustrated by means of numerical example.
수치미분을 이용한 고무의 유한요소 해석시의 수렴성 연구
이창섭(C.S.Lee),홍상표(S.P.Hong),노권택(K.T.Roh),권영두(Y.D.Kwon) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
A finite element procedures for the analysis of rubber-like hyperelastic material is developed. The volumetric incompressibility condition of the rubber deformation is included in the formulation by using penalty method. In this paper. The behavior of the rubber deformation is represented by hyperelastic constitutive relations based on a generalized Mooney-Rivlin model and an extended Mooney-Rivlin model.<br/> The principle of virtual work is used to derive nonlinear finite element equation for large displacement problems and presented in total-Lagrangian description. Considerable improvements have been achieved in the solution by the reduced integration method.<br/> The finite element procedure using analytic differentiation resulted in very close solution to the result of the well known commercial packages NISAⅡ and ABAQUS. Numerical tests show that numerical differential method coincides very well with analytic method and the well known commercial packages in static analysis.<br/>
일방향응고한 Al-Al3Ni 공정복합재료의 비틀림특성에 관한 이론적 고찰
홍준표,권영두,이영문,이상래 대한금속재료학회(대한금속학회) 1981 대한금속·재료학회지 Vol.19 No.4
A theoretical analysis was carried out on the torsional characteristics of directionally solidified Al-Al₃Ni eutectic composites. The torsional properties of the eutectic composites and the matrix were tested in order to estimate the torsional behavior of pure Al₃Ni fiber by means of the rule of mixtures. The Ludwik's equation T=Hγ^n was used to represent the shear stress and strain relation. The stress coefficient, H and strain hardening coefficient, n were obtained by minimizing the errors between the Torque-twist angle curve and the experimental data. The calculated Torque-twist angle curves using Ludwik's equation were shown to closely fit the experimental results, and the calculated stress and strain hardening coefficients of pure Al₃Ni fiber were 836,000∼881,600 KN/㎡ and 1, respectively. The rule of mixtures was more applicable for the torsional behavior than for the tensile behavior.