Physics – Condensed Matter – Materials Science
Scientific paper
2008-02-18
in D. Jeulin, S. Forest (eds), "Continuum Models and Discrete Systems CMDS 11", (Ecole des Mines, Paris, 2008), pp. 443-449. [
Physics
Condensed Matter
Materials Science
6 pages, 5 figures. Presented at the "11th International Symposium On Continuum Models and Discrete Systems (CMDS 11)" (Ecole
Scientific paper
Stress and strain fields in a two-dimensional pixelwise disordered system are computed by a Fast Fourier Transform method. The system, a model for a ductile damaged medium, consists of an elastic-perfectly matrix containing void pixels. Its behavior is investigated under equibiaxial or shear loading. We monitor the evolution with loading of plastically deformed zones, and we exhibit a nucleation / growth / coalescence scenario of the latter. Identification of plastic ``clusters'' is eased by using a discrete Green function implementing equilibrium and continuity at the level of one pixel. Observed morphological regimes are put into correspondence with some features of the macroscopic stress / strain curves.
Pellegrini Yves-Patrick
Willot Francois
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