A large deformation breakage model of granular materials including porosity and inelastic distortional deformation rate.

*(English)*Zbl 1423.74846Summary: A general constitutive model of crushable granular materials is developed within the context of large deformations. The time evolution equations for breakage, inelastic porous compaction and dilation, and distortional deformations are coupled by a yield surface and restrictions are imposed to ensure that these inelastic processes are dissipative. Some of the most salient mechanisms of such materials are described, including: (1) stiffness dependent on the breakage (a variable index of grading), porosity, and pressure; (2) critical comminution pressure and isotropic hardening, also dependent on the breakage and porosity; (3) jamming transition between solid and gaseous states; (4) a dilation law that embodies competition between porous compaction (due to the rate of breakage) and bulking (porous dilation at positive pressure due to the rate of inelastic distortional deformation); and finally, (5) the non-unique critical state relation between stress and porosity, in terms of the loading history and grading changes.

##### MSC:

74R10 | Brittle fracture |

74E20 | Granularity |

74C20 | Large-strain, rate-dependent theories of plasticity |

##### Keywords:

breakage; constitutive equations; granular materials; large deformations; porosity; porous materials
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\textit{M. B. Rubin} and \textit{I. Einav}, Int. J. Eng. Sci. 49, No. 10, 1151--1169 (2011; Zbl 1423.74846)

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