TAILIEUCHUNG - Báo cáo nghiên cứu khoa học: " ABOUT A STRAIN SMOOTHING TECHNIQUE IN FINITE ELEMENT METHOD"

This paper presents a global review of the strain smoothing method to finite element analysis for two-dimension elastostatics. The strain at each point is replaced by a non – local approximation over a smoothing function. With choosing a constant smoothed function and applying the divergence theorem, the stiffness matrix is calculated on boundaries of smoothing elements (smoothing cells) instead of their interior. The presented method gains a high accuracy compared with the standard FEM without increasing computational cost. 1 | TẠP CHÍ PHÁT TRIỂN KH CN TẬP 11 SÓ 01 - 2008 ABOUT A STRAIN SMOOTHING TECHNIQUE IN FINITE ELEMENT METHOD Nguyen Xuan Hung 1 Nguyen Dinh Hien 2 Ngo Thanh Phong 1 l University of Natural Sciences VNU - HCM 2 University of Technical Education HCMc Manuscript Received on April 15th 2007 ABSTRACT This paper presents a global review of the strain smoothing method to finite element analysis for two-dimension elastostatics. The strain at each point is replaced by a non - local approximation over a smoothing function. With choosing a constant smoothed function and applying the divergence theorem the stiffness matrix is calculated on boundaries of smoothing elements smoothing cells instead of their interior. The presented method gains a high accuracy compared with the standard FEM without increasing computational cost. In Finite Element Method FEM an important work to compute the stiffness matrix is often to use mapped elements such as the well-known isoparametric elements through Gauss quadrature rule. Then the element stiffness matrix is evaluated inside element instead of along boundaries of element. In using a mapped element a one - to - one coordinate transformation between the physical and natural coordinates of each element has to be ensured. To satisfy this requirement the convex element is not broken and a violently distorted mesh is not permitted. Purpose of this paper is 1 to construct the element stiffness matrix along its boundaries via a strain smoothing method 2 to utilize a stabilized method with selective cell-wise strain smoothing when solving nearly incompressible elastic problems 3 to estimate the reliability of presented method through numerical examples. 2. GOVERNING EQUATIONS AND WEAK FORM Let Q c K2 be a bounded domain with a polynomial boundary r. The body force b is acting within the domain. The governing equilibrium equation for isotropic linear elasticity writes b 0 in Q 1 where G is the symmetric Cauchy stress tensor. The .

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