Numerical Simulation Of Dynamic Mechanical Properties Of Nano Phase Hybrid Reinforced Aluminum Matrix Composites

This paper focuses on the numerical simulation of mechanical properties of graphene and Si Cp reinforced aluminum matrix composites under dynamic load.The microstructure model of the composite was established by DIGIMAT software,and the dynamic mechanical properties of the composite were simulated by ABAQUS software.The mechanical response,damage and failure mechanism of the composite in dynamic compression were studied by changing the content of reinforcement,strain rate and temperature.The accuracy of the simulation results is verified by experiments.Based on the above work,the following conclusions are drawn:The dynamic mechanical properties and strain rate sensitivity of the composites at different temperatures were analyzed.Thermal insulation softening phenomenon,microstructure and failure mode.It was found that the strength of the composite increased with the increase of the content of reinforcing phase.When the content of graphene and Si Cp was 1vol%,the composite had the best comprehensive mechanical properties.And the composites can still maintain good mechanical properties when the temperature is less than 100℃.The strain rate sensitivity of the composite decreases with the increase of the content of reinforcing phase,and with the increase of temperature,the strain rate sensitivity of the composite decreases,the strain hardening effect weakens,and the plasticity increases significantly.The main failure mode of materials is mainly due to the stress concentration of reinforcement phase during loading,which leads to interface debonding between reinforcement phase and matrix,which makes matrix material slip,and graphene breaks away from its original position and penetrates into matrix,leading to composite failure.The accuracy of simulation results is verified by preparing specimens of aluminum matrix composites with reinforcement content of 1vol% and conducting Hopkinson impact tests.The results show that although the flow stress obtained by numerical simulation is higher than the experimental value under the same conditions,from the perspective of dynamic mechanical properties and strain rate sensitivity of composites,microstructure evolution and deformation failure mechanism,The numerical simulation results are in good agreement with the experimental results.It is proved that the simulation scheme is feasible and has certain guiding significance for production and life.