Transactions of Nanjing University of Aeronautics & Astronautics
A New 3D Meso-mechanical Modeling Method of Coral Aggregate Concrete Considering Interface Characteristics
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Abstract:
On the basis of the three-dimensional （3D） random aggregate & mortar two-phase mesoscale finite element model， C++ programming was used to identify the node position information of the interface between the aggregate and mortar elements. The nodes were discretized at this position and the zero-thickness cohesive elements were inserted. After that， the crack energy release rate fracture criterion based on the fracture mechanics theory was assigned to the failure criterion of the interface transition zone （ITZ） elements. Finally， the three-phase meso-mechanical model based on the combined finite discrete element method （FDEM） was constructed. Based on this model， the meso-crack extension and macro-mechanical behaviour of coral aggregate concrete （CAC） under uniaxial compression were successfully simulated. The results demonstrated that the meso-mechanical model based on FDEM has excellent applicability to simulate the compressive properties of CAC.
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Project Supported:
This work was supported by the Key Projects of the National Science Foundation of China （Nos.52178190， 52078250，11832013）.
Clc Number:
TP391
CHINA AERO-SCIENCES
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