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

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.
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Extreme mechanics letters, Elsevier, 2017, 17, pp.50-55. 〈10.1016/j.eml.2017.09.013〉
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Thanh Tung Nguyen, Julien Yvonnet, Michel Bornert, Camille Chateau, François Bilteryst, et al.. Large-scale simulations of quasi-brittle microcracking in realistic highly heterogeneous microstructures obtained from micro CT imaging. Extreme mechanics letters, Elsevier, 2017, 17, pp.50-55. 〈10.1016/j.eml.2017.09.013〉. 〈hal-01594674〉

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