Modeling of Concrete Aggregate Composite and the Mechanical Response Under Different Loading

A large number of micro cracks are usually distributed inside and influence the mechanical property of concrete remarkably. The micro cracks are easy to expand, converge and penetrate, and eventually cause structural failure and damage of concrete under the external load. The study of the failure mechanism of concrete using three-dimensional numerical models has great significance in theoretical and practical. This paper proposed a three-dimensional concrete aggregate model by using random convex polyhedral aggregate based on Abaqus software. The concrete structure model is modeled by Python program and divided into tetrahedral units, the zero thickness bonding unit is used to characterize the interface transition zone. Based on the damage plasticity model (CDP), the study on the failure simulation of concrete specimens under uniaxial compression was investigated, and analyzed the failure mechanism. The research on concrete compression experimental was conducted to verify the accuracy and reliability of the numerical model, and experimental result fitting well with the numerical simulation results.