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- 저자 : L. Duchene (검색결과 2 건)
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New Solid-Shell Finite Element Based on EAS and ANS Concepts for Sheet Metal Forming
A. Ben Bettaieb,L. Duchene,L. Zhang,A.M. Habraken 한국소성가공학회 2011 기타자료 Vol.2011 No.8
We present in this paper a new eight node solid-shell finite element called SSH3D (Three Dimensional Solid-Shell). This element is currently implemented in the frame of the in-house research code called LAGAMINE. Here the Enhanced Assumed Strain (EAS) technique based on the Hu-Washizu variational principle, described in [1] and [2], is used to cure the volumetric locking occurring when the material shows nearly incompressible behavior and Poisson’s thickness locking caused by the high aspect ratio of the finite element. In the proposed element, the EAS technique can be combined with the Assumed Natural Strain (ANS) [3-5] concept to treat shear locking caused by the transverse shear strain and curvature thickness locking caused by the transverse normal strain. Different schemes for the ANS concept are implemented while the number of integration points and the number of EAS modes are element parameters (the element uses four integration points in the plane of the element and at least two integration points through the thickness direction in a single element layer). These features must be adjusted by the user according to the studied process (geometry and loading) so as to avoid locking and limit the calculation time. This element was successfully tested and the numerical remedies were verified using several kinds of patch tests. A double sided contact problem is modeled in order to investigate the performance and accuracy of the developed element and to validate the suggested approach.
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Influence of Surface Effect On Nickel Micro Deep Drawing Process
C. Keller,M. Aftenid,M. Banu,A.M. Habraken,E. Hug,S. Castagne,L. Duchene 한국소성가공학회 2010 기타자료 Vol.2010 No.6
In this paper, the forming behavior of nickel sheets is investigated as a function of the number of grains across the thickness by finite element simulations. Experimental tensile tests were carried out on nickel samples of approximately 100 μm grain size and thicknesses ranging between 12.5 μm and 3.2 mm. The decrease of the number of grains across the thickness involves a decrease of tensile stress due to the apparition of surface effects. These latter were taken into account for the deep drawing simulation of samples with 250 μm thickness by the use of two different constitutive elasto-plastic laws for surface and core grains. The simulations with two laws predict a modification of the distribution of the V.M. equivalent stress and of the damage zones compared to results from simulations using a simple average law.
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