Abstract
In this paper the concrete under impact load and failure mechanism was studied. Concrete was considered as a three-phase composite material: aggregate, cement mortar and interfacial transmission zone (ITZ).The simulation was based on random polyhedron aggregate model. Mortar and the transition zone were considered as the brittle fracture model material, and the aggregate was considered as plastic material. LS-DYNA finite element program was used to simulate concrete in SHPB experimental device under the impact damage process. It was showed that the reason of the final macro failure was the development of the microcrack, aggregate shape on concrete failure has a certain impact on the failure process.
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