Abstract
A time‐dependent plasticity model for rocks and soils based on Perzyna's elastic/viscoplastic theory is presented, wherein the plasticity yield function is patterned after the inviscid cap model developed over the last decade by Sandler et al. Three aspects are addressed: (1) Theoretical review and development; (2) numerical solution strategies suitable for a displacement‐based finite element method; and (3) illustrative examples of model behavior and comparisons with experimental data. The numerical solution algorithm employs a one‐parameter time integration scheme which provides options for explicit or implicit methods. Nonlinear equations resulting from the implicit method are solved by a Newton‐Raphson iterative technique, and efficiency versus accuracy studies are reviewed. Parameter identification and comparison of the model with experimental data is demonstrated for hard limestone in a variable loading history, soft sedimentary rock in triaxial creep tests, and well‐graded sand in slow and rapid lo...
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