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Finite element formulation of the Ogden material model with application to rubber‐like shells
Author(s) -
Başar Yavuz,
Itskov Mikhail
Publication year - 1998
Publication title -
international journal for numerical methods in engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.421
H-Index - 168
eISSN - 1097-0207
pISSN - 0029-5981
DOI - 10.1002/(sici)1097-0207(19980815)42:7<1279::aid-nme437>3.0.co;2-i
Subject(s) - ogden , finite element method , eigenvalues and eigenvectors , infinitesimal strain theory , strain energy density function , mathematics , parametric statistics , mathematical analysis , strain energy , tensor (intrinsic definition) , geometry , structural engineering , physics , engineering , statistics , quantum mechanics , thermodynamics
The present contribution proposes a variational procedure for the numerical implementation of the Ogden material model. For this purpose the strain energy density originally formulated in terms of the principal stretches is transformed as variational quantities into the invariants of the right Cauchy–Green tensor. This formulation holds for arbitrary three‐dimensional deformations and requires neither solving eigenvalue problems nor co‐ordinate system transformations. Particular attention is given to the consideration of special cases with coinciding eigenvalues. For the analysis of rubber‐like shells this material model is then coupled with a six parametric shells kinematics able to deal with large strains and finite rotations. The incompressibility condition is considered in the strain energy, but it is additionally used as 2‐D constraint for the elimination of the stretching parameter at the element level. A four node isoparametric finite element is developed by interpolating the transverse shear strains according to assumed strain concept. Finally, examples are given permitting to discuss the capability of the finite element model developed concerning various aspects. © 1998 John Wiley & Sons, Ltd.