A new polyhedral element for the analysis of hexahedral-dominant finite element models and its application to nonlinear solid mechanics problems

A hexahedral-dominant finite element mesh can be easily constructed by cutting regular hexahedral elements in a simple block with CAD surfaces representing outer surfaces of a geometric model. Polyhedral elements with straight edges but possibly non-planar faces are generated at the domain boundarie...

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Vydáno v:Computer methods in applied mechanics and engineering Ročník 324; s. 248 - 277
Hlavní autoři: Nguyen-Hoang, Son, Sohn, Dongwoo, Kim, Hyun-Gyu
Médium: Journal Article
Jazyk:angličtina
Vydáno: Amsterdam Elsevier B.V 01.09.2017
Elsevier BV
Témata:
Approximation
Boundary element method
CAD
Computer aided design
Continuity (mathematics)
Elastic deformation
Elastoplasticity
Finite element analysis
Finite element method
Hyperelastic materials
Large deformations
Mathematical analysis
Mathematical models
Moving least square approximation
Polyhedra
Polyhedral elements
Shape functions
Solid mechanics
Solid modeling
Studies
Trimmed hexahedral elements
Hyperelastic materials
Trimmed hexahedral elements
Moving least square approximation
Polyhedral elements
Large deformations
ISSN:0045-7825, 1879-2138
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Popis
Shrnutí:A hexahedral-dominant finite element mesh can be easily constructed by cutting regular hexahedral elements in a simple block with CAD surfaces representing outer surfaces of a geometric model. Polyhedral elements with straight edges but possibly non-planar faces are generated at the domain boundaries, while regular hexahedral elements remain in the interior region. Shape functions for polyhedral elements are derived from moving least square approximation based on a tetrahedral subdivision of polyhedral domains by a centroid-based subdivision technique. The polyhedral shape functions in this study have similar properties to conventional finite element shape functions in terms of continuity and completeness within elements, compatibility across inter-element boundaries and the Kronecker-delta property. Furthermore, the present approach using hexahedral-dominant meshes with polyhedral elements at domain boundaries is successfully applied to solve large deformation problems of hyperelastic and elastic–plastic materials.
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ISSN:0045-7825
1879-2138
DOI:10.1016/j.cma.2017.06.014