An 8-node tetrahedral finite element suitable for explicit transient dynamic simulations [electronic resource].

Published:: Albuquerque, N.M. : Sandia National Laboratories, 1997.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:: pages 34 : digital, PDF file
Additional Creators:: Sandia National Laboratories and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

Considerable effort has been expended in perfecting the algorithmic properties of 8-node hexahedral finite elements. Today the element is well understood and performs exceptionally well when used in modeling three-dimensional explicit transient dynamic events. However, the automatic generation of all-hexahedral meshes remains an elusive achievement. The alternative of automatic generation for all-tetrahedral finite element is a notoriously poor performer, and the 10-node quadratic tetrahedral finite element while a better performer numerically is computationally expensive. To use the all-tetrahedral mesh generation extant today, the authors have explored the creation of a quality 8-node tetrahedral finite element (a four-node tetrahedral finite element enriched with four midface nodal points). The derivation of the element`s gradient operator, studies in obtaining a suitable mass lumping and the element`s performance in applications are presented. In particular, they examine the 80node tetrahedral finite element`s behavior in longitudinal plane wave propagation, in transverse cylindrical wave propagation, and in simulating Taylor bar impacts. The element only samples constant strain states and, therefore, has 12 hourglass modes. In this regard, it bears similarities to the 8-node, mean-quadrature hexahedral finite element. Given automatic all-tetrahedral meshing, the 8-node, constant-strain tetrahedral finite element is a suitable replacement for the 8-node hexahedral finite element and handbuilt meshes.

Report Numbers:

E 1.99:sand--98-1591
E 1.99: conf-9709141--proc.
conf-9709141--proc.
sand--98-1591

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Published through SciTech Connect.
12/31/1997.
"sand--98-1591"
" conf-9709141--proc."
"DE99000778"
5. joint Russian-American computational mathematics conference, Albuquerque, NM (United States), 2-5 Sep 1997.
Stone, C.M.; Heinstein, M.W.; Key, S.W.

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