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