Journal ArticleDOI
Superconvergent patch recovery with equilibrium and conjoint interpolant enhancements
Ted Blacker,Ted Belytschko +1 more
TLDR
In this article, the superconvergent patch derivative recovery method of Zienkiewicz and Zhu is enhanced by adding the squares of the residuals of the equilibrium equation and natural boundary conditions.Abstract:
The superconvergent patch derivative recovery method of Zienkiewicz and Zhu is enhanced by adding the squares of the residuals of the equilibrium equation and natural boundary conditions. In addition, a new conjoint polynomial for interpolating the local patch stresses over the element which significantly improves the local projection scheme is presented. Results show that in the 4-node quadrilateral, the equilibrium and boundary condition residuals usually improve accuracy but not the rate of convergence, whereas in the 9-node quadrilateral, results are mixed. The conjoint polynomial always improves the accuracy of the derivative field within the element as compared to the standard nodal interpolation, particularly in 4-node quadrilaterals.read more
Citations
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Journal ArticleDOI
Recovery by Equilibrium in Patches (rep)
TL;DR: In this paper, a new recovery technique is developed, based on equilibrating the recovered stresses in the patch, in the same way that the standard FEM does, which leads to a weak form of equilibrium equations of new stresses on the patch and consequently to answers satisfying the discrete equilibrium conditions.
Journal ArticleDOI
Improving the accuracy of XFEM crack tip fields using higher order quadrature and statically admissible stress recovery
Q. Z. Xiao,Bhushan Lal Karihaloo +1 more
TL;DR: In this paper, a statically admissible stress recovery (SAR) scheme is introduced to fit the stresses at sampling points (e.g. quadrature points) obtained by the extended/generalized finite element method (XFEM).
Journal ArticleDOI
A recovery-type error estimator for the extended finite element method based on singular+smooth stress field splitting
TL;DR: In this paper, a new stress recovery procedure that provides accurate estimations of the discretization error for linear elastic fracture mechanic problems analyzed with the extended finite element method (XFEM) is presented.
Journal ArticleDOI
Finite element derivative recovery by moving least square interpolants
TL;DR: In this paper, a simple, accurate technique for recovery of displcements and derivatives, such as strains, is presented, based on local interpolation of nodal displacements using a moving least square method.
Journal ArticleDOI
Gradient recovery type a posteriori error estimates for finite element approximations on irregular meshes
Ningning Yan,Aihui Zhou +1 more
TL;DR: The gradient recovery type a posteriori error estimators for finite element approximations are proposed for irregular meshes and it is shown that the a posterioru error estimates is asymptotically exact on where the mesh is regular enough and the exact solution is smooth.
References
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Journal ArticleDOI
Theory of Elasticity (3rd ed.)
Journal ArticleDOI
A simple error estimator and adaptive procedure for practical engineerng analysis
O. C. Zienkiewicz,J. Z. Zhu +1 more
TL;DR: A new error estimator is presented which is not only reasonably accurate but whose evaluation is computationally so simple that it can be readily implemented in existing finite element codes.
Journal ArticleDOI
The superconvergent patch recovery and a posteriori error estimates. Part 1: The recovery technique
O. C. Zienkiewicz,J. Z. Zhu +1 more
TL;DR: In this article, a general recovery technique is developed for determining the derivatives (stresses) of the finite element solutions at nodes, which has been tested for a group of widely used linear, quadratic and cubic elements for both one and two dimensional problems.
Journal ArticleDOI
Local and global smoothing of discontinuous finite element functions using a least squares method
E. Hinton,John S. Campbell +1 more
TL;DR: In this article, the concepts and potential advantages of local and global least squares smoothing of discontinuous finite element functions are introduced, and the relationship between local smoothing and the reduced integration technique is established.
Journal ArticleDOI
The post-processing approach in the finite element method—part 1: Calculation of displacements, stresses and other higher derivatives of the displacements
Ivo Babuška,A. Miller +1 more
TL;DR: In this article, a method for post-processing a finite element solution to obtain high accuracy approximations for displacements, stresses, stress intensity factors, etc. is presented.
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The superconvergent patch recovery and a posteriori error estimates. Part 1: The recovery technique
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