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罗良,杨晓京.单晶锗纳米切削过程分子动力学仿真与实验研究[J].稀有金属材料与工程(英文),2019,48(12):3863~3869.[Luo liang and Yang Xiaojing.Molecular dynamics simulation and experimental study of single crystalline germanium cutting process[J].Rare Metal Materials and Engineering,2019,48(12):3863~3869.]
Molecular dynamics simulation and experimental study of single crystalline germanium cutting process
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Received:June 27, 2018  Revised:July 14, 2018
Key words: molecular dynamics  single crystal germanium  cutting force  vertical load  cutting speed
Foundation item:国家自然科学基金资助(项目号51765027,51365021)
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Luo liang and Yang Xiaojing  
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      In order to understand the nanoscale cutting characteristics of single crystal germanium and improve the optical surface quality of the nanoscale germanium, three-dimensional molecular dynamics (MD) simulations were carried out to study the contact and sliding processes between diamond points and surfaces of single crystal germanium. The material deformation, cutting force, chips pile-up, surface morphology size, and the sliding friction process were investigated. The simulation results show that the cutting force, surface morphology size, and chips plie-up, increase during the contact process with increasing vertical force, and there is no obvious correlation with the cutting speed. The fundamental reason for the fluctuation of the cutting force in the cutting process is caused by the generation of dislocation and the energy fluctuation caused by the destruction of the lattice of single crystal germanium. In order to verify the correctness of the simulation results, nanometer cutting experiments on single crystal germanium were carried out using nano-scratch tester. The experimental results are in agreement with the simulation results, which verify the correctness and effectiveness of the MD model.