A mixed finite element procedure of gradient Cosserat continuum for second-order computational homogenisation of granular materials. (English) Zbl 1311.74125
Summary: A mixed finite element (FE) procedure of the gradient Cosserat continuum for the second-order computational homogenisation of granular materials is presented. The proposed mixed FE is developed based on the Hu-Washizu variational principle. Translational displacements, microrotations, and displacement gradients with Lagrange multipliers are taken as the independent nodal variables. The tangent stiffness matrix of the mixed FE is formulated. The advantage of the gradient Cosserat continuum model in capturing the meso-structural size effect is numerically demonstrated. Patch tests are specially designed and performed to validate the mixed FE formulations. A numerical example is presented to demonstrate the performance of the mixed FE procedure in the simulation of strain softening and localisation phenomena, while without the need to specify the macroscopic phenomenological constitutive relationship and material failure model. The meso-structural mechanisms of the macroscopic failure of granular materials are detected, i.e. significant development of dissipative sliding and rolling frictions among particles in contacts, resulting in the loss of contacts.
MSC:
| 74S05 | Finite element methods applied to problems in solid mechanics |
| 74E20 | Granularity |
| 74Q05 | Homogenization in equilibrium problems of solid mechanics |
Keywords:
mixed finite element; gradient Cosserat continuum; discrete particle assembly; granular material; computational homogenisationReferences:
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