Spall Behaviors of Metaconcrete: 3D Meso-Scale Modelling

Spalling is a typical tensile fracture phenomenon due to insufficient strength of concrete. Concrete structure might experience severe spall damage at the rear surface owing reflected stress wave induced by impulsive load. In recent years, metaconcrete consisting engineered aggregates has attracted attentions as exhibits extraordinary wave-filtering characteristics. Metaconcrete can be used attenuate generated load and hence possibly mitigate damage. this study, aggregate designed via software COMSOL have frequency bandgap coincide with dominant band propagating in normal concrete (NC) specimen reduce propagation The behaviors periodically distributed been investigated previous study. This study establishes 3D meso-scale model including mortar, randomly natural simulate LS-DYNA. responses composed single multiple bandgaps are studied. results show that more effectively attenuated using bandgaps. It found although propagation, soft coating reduces material strength, therefore not necessarily less than concrete, but different mode. addition, influences loading intensity duration on wave, well also