Study On The Strength Toughness And Damage Mechanism Of Silicon Carbide Reinforced Aluminum Based Composites With Phase Field Methodology

Silicon carbide reinforced aluminum based(SiC/Al)composite material is a novel type of high-performance,high-strength,corrosion-resistant,and wear-resistant composite material that has broad application prospects in fields such as aerospace,automotive,and marine engineering.However,due to its complex microstructure and material properties,there are still some shortcomings in the research on the strength toughness and damage mechanism of SiC/Al composites.Phase-field method is a novel energy-driven method for simulating material fracture,which has higher accuracy,more comprehensive information,and higher efficiency compared to traditional numerical simulation methods(such as XFEM).It can better simulate the mechanical behavior and damage mechanism of materials.In this study,the phase-field method was used for the first time to investigate the strength toughness and damage mechanism of SiC/Al composites.By establishing a finite element model of SiC/Al composites and combining it with the phase-field method for numerical simulation,the influence of toughness and damage mechanism on SiC/Al composites was explored.Specifically,this study used Python scripts to parameterize the modeling of SiC/Al composites,established an automatic simulation platform based on Matlab-Abauqs software,and realized parameterized control of the microstructure and material parameters of SiC/Al composites.Based on this platform,this study investigated the influence mechanism of various material parameters on the mechanical properties and damage behavior of SiC/Al composites,including critical energy release rate,elastic modulus,Poisson’s ratio,yield strength,and hardening modulus.By using numerical simulation methods,a deeper understanding of the mechanical properties of SiC/Al composites was obtained,providing guidance for the optimization of its performance.Finally,this study investigated the influence of the microstructure of SiC/Al composites on their strength toughness and damage mechanism.The significance of pre-existing cracks on the reliability of the simulation crack propagation results was analyzed and discussed,and the distribution of SiC particles and the effects caused by random distribution were studied.The optimization effect of the homogeneity function on the random distribution model was verified.The influence of SiC volume fraction,particle size,and particle refinement on the overall strength toughness and damage mechanism of SiC/Al composites was discussed,providing guidance for optimizing the structure of SiC/Al composites.The application of the phase-field method provides a new perspective for the fracture mechanics research of SiC/Al composites and provides a new research method for understanding its performance in depth.This study has important significance for deepening the understanding of the toughness and damage mechanism of SiC/Al composites and providing a theoretical basis for their promotion and development in practical applications.