Rotational kinematic hardening model for sand. Part II Characteristic work hardening law and predictions

Abstract

Abstract A new kinematic hardening mechanism has been proposed which incorporates rotation and intersection of yield surfaces to achieve a more consistent and physically rational fit with experimentally observed soil behavior during large stress reversals. An existing elasto-plastic model with isotropic hardening is used as the basic framework to which the rotational kinematic hardening mechanism has been added. The existing, isotropic work hardening law is shown here to apply to isotropic as well as kinematic behavior of sand. The new combined model preserves the behavior of the isotropic hardening model under monotonic loading conditions, and the extension from isotropic to rotational kinematic hardening is accomplished without introducing new material parameters. The capability of the proposed model is examined by comparing predictions with experimental data for simple and complex stress paths involving large stress reversals in the triaxial plane.