| Ceramics is very promising to be widely applied due to the excellent physical and chemicalproperties. However, defects of high brittleness, poor processability, high sintering temperaturein ceramics lead to the difficulty of the actual processing and hinder its application. With thedevelopment of the computer technology, molecular dynamics simulation is an effective andfeasible method to study the macro-properties of actual processing from microcosmic view forceramics, the molecular dynamics simulation is testable, safety, and it can reduce the amount ofexperiment. The research analyze the process of nano-cutting and sintering, and it can lay a goodfoundation for studying the application of molecular dynamics in the complex structure materialprocessing and sintering process, and it is very helpful to improving the level of nano-processingand sintering process.Molecular dynamics method is used in this research, through the nano-processing isresearched by the molecular dynamics model of SiC nano-cutting. The relaxation and the form ofthe cutting surface are analyzed by simulation. The change law of stress and cutting force and theinfluences of parameters on energy are analyzed in the paper. The results show that the stress,cutting force and energy fluctuate with the change of the structure of grid; with the increase ofthe cutting depth, the kinetic energy and the potential energy decreases, with the increase of thetool rake, the kinetic energy decreases, with the increase of the cutting speed, the kinetic energyincreases.Molecular dynamics model of sintering process of Si3N4is established in this paper. Insintering process, with the rise of temperature, atomic motion aggravate and the atoms deviatefrom the balance position, and kinetic energy, potential energy system increase. When reachedand maintain1993K, the movement of atoms becomes more irregular, the energy fluctuates sharply. In cooling process, the movement of the atoms recede, the energy of the system reduce. |
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