Fourier-based schemes for computing the mechanical response of composites with accurate local fields - 07/02/15

| pages | 14 |
| Iconographies | 10 |
| Vidéos | 0 |
| Autres | 0 |
Abstract |
We modify the Green operator involved in Fourier-based computational schemes in elasticity, in 2D and 3D. The new operator is derived by expressing continuum mechanics in terms of centered differences on a rotated grid. Using the modified Green operator leads, in all systems investigated, to more accurate strain and stress fields than using the discretizations proposed by Moulinec and Suquet (1994) [[1]] or Willot and Pellegrini (2008) [[2]]. Moreover, we compared the convergence rates of the “direct” and “accelerated” FFT schemes with the different discretizations. The discretization method proposed in this work allows for much faster FFT schemes with respect to two criteria: stress equilibrium and effective elastic moduli.
Le texte complet de cet article est disponible en PDF.Keywords : FFT methods, Homogenization, Heterogeneous media, Linear elasticity, Computational mechanics, Spectral methods
Plan
Vol 343 - N° 3
P. 232-245 - mars 2015 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
L’accès au texte intégral de cet article nécessite un abonnement.
Bienvenue sur EM-consulte, la référence des professionnels de santé.
L’achat d’article à l’unité est indisponible à l’heure actuelle.
Déjà abonné à cette revue ?
