Abstract
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.
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The authors are pleased to acknowledge the support for this work by the National Natural Science Foundation of China through Contract/Grant numbers 11372066, 11072046, 11102036 and the National Key Basic Research and Development Program (973 Program) through Contract number 2010CB731502.
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Li, X., Liang, Y., Duan, Q. et al. A mixed finite element procedure of gradient Cosserat continuum for second-order computational homogenisation of granular materials. Comput Mech 54, 1331–1356 (2014). https://doi.org/10.1007/s00466-014-1062-9
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DOI: https://doi.org/10.1007/s00466-014-1062-9