Crack nucleation and propagation in highly heterogeneous microstructure models based on X-ray CT images of real materials

Thanh Tung T.T. Nguyen (1, 2) , Julien Yvonnet (2) , Qizhi Zhu (2) , Michel Bornert (1) , Camille Chateau (1)

1 navier umr 8205 - Laboratoire Navier
2 MSME - Laboratoire de Modélisation et Simulation Multi Echelle

In this work, crack nucleation and propagation in highly heterogeneous materials models, such as those obtained by micro-CT imagery of real materials, are investigated for the first time by means of the phase field method. The Phase field method is based on a variational formulation of brittle fracture with a regularized approximation of discontinuities. Its various advantages for voxel-based models of microstructures are discussed. A shifted strain split operator algorithm is proposed to handle unilateral contact within cracks in a very efficient manner.

Mots clés: Cracks; Nucleation; Phase Field; Voxel models; Heterogeneous materials; Microtomography

Domaines: Mécanique [physics]

Thanh Tung T.T. Nguyen, Julien Yvonnet, Qizhi Zhu, Michel Bornert, Camille Chateau. Crack nucleation and propagation in highly heterogeneous microstructure models based on X-ray CT images of real materials. 12e Colloque national en calcul des structures, CSMA, May 2015, Giens, France. 4p. ⟨hal-01514290⟩