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• W1981829372 abstract "The response of concrete and mortar under high-strain-rate impact loading are analyzed using fully dynamic finite element simulations. The analyses concern the load-carrying capacity, energy absorbency and the effect of the microstructure. The simulations focus on the plate impact configuration used in the experimental part of this research, allowing for direct comparison of model predictions with experimental measurements. A micromechanical model is formulated and used, accounting for the two-phase composite microstructure of concrete. Arbitrary microstructural phase morphologies of actual concrete used in impact experiments are digitized and explicitly considered in the numerical models. The behavior of the two constituent phases in the concrete are characterized by an extended Drucker–Prager model that accounts for pressure-dependence, rate-sensitivity, and strain hardening/softening. Model parameters are determined by independent impact experiments on mortar and through a parametric study in which the prediction of numerical simulations is matched with measurements from experiments on concrete and mortar. Calculations show that significant inelastic deformations occur in the mortar matrix under the impact conditions analyzed and relatively smaller inelastic strains are seen in the aggregates. The influence of aggregate volume fraction on the dynamic load-carrying capacity of concrete is explored. The strength increases with aggregate volume fraction and an enhancement of approximately 30% over that of mortar is found for an aggregate volume fraction of 42%. Numerical simulations also show increasing energy absorbency with increasing aggregate volume fraction and provide a time-resolved characterization for the history of work dissipation as the deformation progresses." @default.
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• W1981829372 date "2001-10-01" @default.
• W1981829372 modified "2023-10-02" @default.
• W1981829372 title "Dynamic behavior of concrete at high strain rates and pressures: II. numerical simulation" @default.
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• W1981829372 doi "https://doi.org/10.1016/s0734-743x(01)00021-5" @default.
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