Modeling Stress-Dependent Anisotropic Elastoplastic Unbound Granular Base in Flexible Pavements
作者： Yuqing Zhang , Fan Gu , Xue Luo , Bjorn Birgisson , Robert L. Lytton
关键词: Materials science 、 Subgrade 、 Plasticity 、 Stress (mechanics) 、 Base course 、 Finite element method 、 Modulus 、 Constitutive equation 、 Deformation (engineering) 、 Structural engineering 、 Mechanical engineering 、 Civil and Structural Engineering
摘要: Unbound granular base (UGB) has a cross-anisotropic and nonlinear (stress-dependent) modulus with a plastic behavior. Existing UGB models address nonlinear cross-anisotropy and plasticity separately. It is unknown how the two characteristics are coupled into a finite element model (FEM) and how this will affect the pavement responses. This study presents a coupled nonlinear cross-anisotropic elastoplastic (NAEP) constitutive model for the UGB and implements it in a weak form equation-based FEM. No material subroutine is needed to …
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