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

Thanh Nguyen, Julien Yvonnet, Michel Bornert, Camille Chateau, François Bilteryst, Eric Steib, Thanh Nguyen, Julien Yvonnet, Michel Bornert, Camille Chateau, François Bilteryst, T Nguyen (+5 others)
unpublished
Large-scale simulations of quasi-brittle microcracking in realistic highly heterogeneous microstruc-tures obtained from micro CT imaging. Extreme mechanics letters, Elsevier, 2017, 17, pp.50-55. 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
more » ... cribe 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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