Multi-Scale Random Sets: from Morphology to Effective Properties and to Fracture Statistics

Dominique Jeulin (1)

1 CMM - Centre de Morphologie Mathématique

Complex microstructures in materials often involve multi-scale heterogeneous textures, modelled by random sets derived from Mathematical Morphology. Starting from 2D or 3D images, a complete morphological characterization by image analysis is performed, and used for the identification of a model of random structure. From morphological models, simulations of realistic microstructures are introduced in a numerical solver to compute appropriate fields (electric, elastic stress or strain, ...) and to estimate the effective properties by numerical homogenization, accounting for scale dependent statistical fluctuations of the fields. Our approach is illustrated by various examples of multi-scale models: Boolean random sets based on Cox point processes and various random grains (spheres, cylinders), showing a very low percolation threshold, and therefore a high conductivity or high elastic moduli for a low volume fraction of a second phase. Multiscale Cox point processes are also a source of instructive models of fracture statistics, such as multiscale weakest link models.

Mots clés: 3-D image; Complex microstructures; Effective property; Elastic stress; Fracture statistics; High conductivity; High elastic modulus; Instructive models; Morphological characterization; Morphological model; Multiscale models; Multiscales; Numerical homogenization; Numerical solvers; Percolation thresholds; Point process; Random grains; Random set; Random structures; Second phase; Statistical fluctuations; Weakest-link models

Domaines: Matériaux

Dominique Jeulin. Multi-Scale Random Sets: from Morphology to Effective Properties and to Fracture Statistics. 12th International Symposium on Continuum Models and Discrete Systems ((CMDS-12), Feb 2011, Kolkata, India. 12 p., 12013, ⟨10.1088/1742-6596/319/1/012013⟩. ⟨hal-00836679⟩