Abstract
Dynamic compaction and fracture of concrete is simulated at the mesoscale. Calculations are carried out under conditions of nominally uniaxial stress and uniaxial strain at a strain rate of 5000 s-1, allowing the effect of confinement, or stress triaxiality, on the response to be analyzed. A series of mesostructures, each member containing between 0–40% quartz aggregate and 0–5% pores by volume, is randomly generated to investigate the effect of mesostructure. The analysis focuses on load-carrying capacity and energy dissipation. Fracture within bulk phases and along interfaces in the structures is modeled using the cohesive finite element method. Dissipation through inelastic flow, fracture, and friction are separately tracked and quantified. Calculated results show that triaxiality has a strong influence on the dominant mode of energy dissipation and the volume fractions of aggregate and pores significantly influence the load-carrying capacity and energy dissipation capabilities of the materials. The framework and data presented can be used to support the design of materials with optimized trade-offs between competing performance metrics during dynamic loading.
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