Surface Creation Mechanism Analysis of Machining SiCp/Al Based on Strain Gradient Theory
In order to gain a deeper understanding of the cutting processes of particle reinforced a-luminum matrix composites,a constitutive model was established based on the strain gradient theory for 45％-SiCp/Al composites through multiphase modeling.Through the secondary development of simulation software ABAQUS,the established constitutive equation and B-W fracture criterion descri-bing fracture were programmed into the user subroutine VUMAT using programming language,and then imported into ABAQUS for simulation analysis.Based on the cutting experiments and simulation analysis results,the changes in surface temperature,internal stress and strain,and dislocations of SiCp/Al composite materials with different cutting depths at the same cutting speed were studied.The results indicate that the modified constitutive model is more consistent with the experimental ones compared to the traditional Johnson-Cook model,and it is found that an increase in cutting depth will trigger a high-temperature gradient.The internal stress of the material will form stress concentration near the particles.A large number of dislocations appear in areas with high strain on the machining surfaces,which increases the difficulty of machining particle reinforced metal matrix composites.
particle reinforced metal matrix compositestrain gradientcutting temperaturedis-location
万方数据
维普
