×

Locking-free continuum displacement finite elements with nodal integration. (English) Zbl 1195.74182

Summary: An assumed-strain finite element technique is presented for linear, elastic small-deformation models. Weighted residual method (reminiscent of the strain – displacement functional) is used to weakly enforce the balance equation with the natural boundary condition and the kinematic equation (the strain – displacement relationship). A priori satisfaction of the kinematic weighted residual serves as a condition from which strain – displacement operators are derived via nodal integration. A variety of element shapes is treated: linear triangles, quadrilaterals, tetrahedra, hexahedra, and quadratic (six-node) triangles and (27-node) hexahedra. The degrees of freedom are only the primitive variables (displacements at the nodes). The formulation allows for general anisotropic materials. A straightforward constraint count can partially explain the insensitivity of the resulting finite element models to locking in the incompressible limit. Furthermore, the numerical inf – sup test is applied in select problems and several variants of the proposed formulations (linear triangles, quadrilaterals, tetrahedra, hexahedra, and 27-node hexahedra) pass the test. Examples are used to illustrate the performance with respect to sensitivity to shape distortion and the ability to resist volumetric locking.

MSC:

74S05 Finite element methods applied to problems in solid mechanics
Full Text: DOI

References:

[1] Felippa, On the original publication of the general canonical functional of linear elasticity, Journal of Applied Mechanics-Transactions of the ASME 67 (1) pp 217– (2000) · Zbl 1110.74435
[2] Hughes, Generalization of selective integration procedures to anisotropic and non-linear media, International Journal for Numerical Methods in Engineering 15 (9) pp 1413– (1980) · Zbl 0437.73053
[3] Simo, On the variational foundations of assumed strain methods, Journal of Applied Mechanics-Transactions of the ASME 53 (1) pp 51– (1986) · Zbl 0592.73019
[4] Cohen, Higher-order Numerical Methods for Transient Wave Equations (2001)
[5] Piltner, Triangular finite elements with rotational degrees of freedom and enhanced strain modes, Computers and Structures 75 (4) pp 361– (2000)
[6] Auricchio, An analysis of some mixed-enhanced finite element for plane linear elasticity, Computer Methods in Applied Mechanics and Engineering 194 (27-29) pp 2947– (2005)
[7] Chapelle, The inf-sup test, Computers and Structures 47 (4-5) pp 537– (1993) · Zbl 0780.73074
[8] Rathod, On the application of two Gauss-Legendre quadrature rules for composite numerical integration over a tetrahedral region, Applied Mathematics and Computation 189 (1) pp 131– (2007) · Zbl 1125.65022
[9] MacNeal, A proposed standard set of problems to test finite element accuracy, Finite Elements in Analysis and Design 1 pp 3– (1985)
[10] Bonet, A simple average nodal pressure tetrahedral element for incompressible and nearly incompressible dynamic explicit applications, Communications in Numerical Methods in Engineering 14 pp 437– (1998) · Zbl 0906.73060
[11] Dohrmann, Node-based uniform strain elements for three-node triangular and four-node tetrahedral meshes, International Journal for Numerical Methods in Engineering 47 pp 1549– (2000) · Zbl 0989.74067
[12] Bonet, An averaged nodal deformation gradient linear tetrahedral element for large strain explicit dynamic applications, Communications in Numerical Methods in Engineering 17 pp 551– (2001) · Zbl 1154.74307
[13] Pires, An assessment of the average nodal volume formulation for the analysis of nearly incompressible solids under finite strains, Communications in Numerical Methods in Engineering 20 pp 569– (2004) · Zbl 1302.74173
[14] Puso, A stabilized nodally integrated tetrahedral, International Journal for Numerical Methods in Engineering 67 (6) pp 841– (2006) · Zbl 1113.74075
[15] Puso, Meshfree and finite element nodal integration methods, International Journal for Numerical Methods in Engineering (2007) · Zbl 1159.74456 · doi:10.1002/nme.2181
[16] Chen, A stabilized conforming nodal integration for Galerkin mesh-free methods, International Journal for Numerical Methods in Engineering 50 (2) pp 435– (2001) · Zbl 1011.74081
[17] Yoo, Stabilized conforming nodal integration in the natural-element method, International Journal for Numerical Methods in Engineering 60 pp 861– (2004) · Zbl 1060.74677
[18] Sze, Stabilized conforming nodal integration: exactness and variational justification, Finite Elements in Analysis and Design 41 (2) pp 147– (2004)
[19] Liu, A smoothed finite element method for mechanics problems, Computational Mechanics 39 (6) pp 859– (2007) · Zbl 1169.74047
[20] Liu, Theoretical aspects of the smoothed finite element method (SFEM), International Journal For Numerical Methods in Engineering 71 pp 902– (2007) · Zbl 1194.74432 · doi:10.1002/nme.1968
[21] Krysl, Locking-free displacement-based finite elements with nodal integration for Reissner-Mindlin plates, Computer Methods in Applied Mechanics and Engineering (2007)
This reference list is based on information provided by the publisher or from digital mathematics libraries. Its items are heuristically matched to zbMATH identifiers and may contain data conversion errors. In some cases that data have been complemented/enhanced by data from zbMATH Open. This attempts to reflect the references listed in the original paper as accurately as possible without claiming completeness or a perfect matching.