Large-scale simulations of quasi-brittle microcracking in realistic highly heterogeneous microstructures obtained from micro CT imaging

Thanh Tung Nguyen; Julien Yvonnet; Michel Bornert; Camille Chateau; François Bilteryst; Eric Steib

Large-scale simulations of quasi-brittle microcracking in realistic highly heterogeneous microstructures obtained from micro CT imaging

Thanh Tung Nguyen ^{1, 2} Julien Yvonnet ¹ Michel Bornert ² Camille Chateau ² François Bilteryst ³ Eric Steib ³

1 MSME - Laboratoire de Modélisation et Simulation Multi Echelle

3 LEMTA - Laboratoire d'Energétique et de Mécanique Théorique Appliquée

Abstract : We present large-scale simulations of microcracking initiation and propagation using a continuum mechanics description in realistic, voxel-based microstructures of heterogeneous quasi-brittle materials obtained from CT imaging techniques. The phase field method is used to describe the evolution of the complex microcracks networks in both uniaxial tension and compression of a sub-volume of a lightweight concrete, where all pores and sand grains are explicitly described. A description of the meshing techniques for such complex voxel-based models is provided, and a convergence study of the tensile failure strength with respect to the sample size is carried out. Such large-scale simulations have high potential to be used either within recent concurrent multiscale methods or in approaches combining in-situ experiments with 3D imaging techniques and simulations for inverse identification of microstructural damage models.

Keywords : quasi-brittle materials Cracks phase field microstructures image-based models of microstructures * Correspondance to J Yvonnet

Document type :

Journal articles

Domain :

Engineering Sciences [physics]

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https://hal-upec-upem.archives-ouvertes.fr/hal-01594674
Contributor : J. Yvonnet <>
Submitted on : Tuesday, September 26, 2017 - 9:04:05 PM
Last modification on : Friday, October 4, 2019 - 1:14:16 AM
Long-term archiving on : Wednesday, December 27, 2017 - 2:20:30 PM

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Large-scale simulations of quasi-brittle microcracking in realistic highly heterogeneous microstructures obtained from micro CT imaging

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