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[論文] Response of a Prototype Brain Material Subjected to Rotational Acceleration
이응선(E.S.Lee),임세영(S.Y.Im) 한국자동차공학회 1989 오토저널 Vol.11 No.5
With the objective of studying the response of brain tissue in a transient rotational acceleration of the head, as occurs in car crash, the problem of a cylindrical case containing a prototype brain material of silicone gel and subjected to a rotational acceleration around the axis of the cylinder is analysed. The prototype material is considered to be homogeneous and isotropic, and is modeled alternatively as a linear elastic or a linear viscoelastic solid.<br/> The computational model for the present problem consists of a 3-dimensional isoparametric finite element model, wherein large deformations and large strains are treated through the updated Lagrangian approach. A comparison of the results of the present 3-dimensional computations, with the attendant assumptions on material data, is made with the results of independent experimental study. The deformation profIles and the major characteristics ofresponse of the brain material are in good agreement with the test results. Moreover, the study suggests the possibility that the use of more accurate material data may yield very useful results even appropriate for accurate quantification of deformations.
김주완(Juwan Kim),임세영(S. Im) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.3
We propose an implicit numerical implementation for Leblond's transformation plasticity constitutive equations, which are widely used in welded steel structure. We apply Euler backward scheme rule to integrate the equations and determine the consistent tangent modulus. The implementation may be used with updated Lagrangian formulation. we test a simple butt-welding process to compare with SYSWELD and discuss the accuracy. We study the efficiency of parallel computation for the finite element analysis of a welded structure using multi-frontal solver.
Explicit code를 이용한 Lower control arm의 스탬핑 해석
하원필(W. P. Ha),임세영(S. Y. Im) 한국자동차공학회 1994 한국 자동차공학회논문집 Vol.2 No.4
To examine the residual stress field resulting from stamping process for the lower control arm of a car, the explicit finite element analysis is performed for the stamping process by way of the ABAQUS Explicit. The residual stress is obtained in terms of the Van Mises stress and other parameters such as equivalent plastic strain, the change of blank thickness, the final configuration of the blank and the spring back effect are also considered. Moreover, discussed is the convergence of the explicit FEM versus the punch speed and the element discretization<br/>