纳米加工表面性能演变规律的研究

项目名称： 纳米加工表面性能演变规律的研究

项目编号： No.51475108

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 机械、仪表工业

项目作者： 孙雅洲

作者单位： 哈尔滨工业大学

项目金额： 80万元

中文摘要： 零件的表面特性对零件的功能和使用性能有着重要影响。具有纳米级加工精度的超光滑表面，其加工表面材料原子的迁移会随时间、空间和环境因素发生微观的变化，研究这一过程的演变规律，具有重要的理论意义和应用价值。本课题首先建立纳米加工过程的分子动力学模型，分析纳米加工过程中的材料力学和运动学行为；然后以分子动力学的计算结果为加工表面初始构型，采用蒙特卡罗方法，建立纳米加工表面行为演变的随机动力学模型，研究纳米加工表面几何、力学、物理及化学等相关特性的变化机理，辨识加工参数和环境因素对纳米加工表面性能及其变化的影响机制，探索纳米加工表面性能的演变规律；最后融合单点金刚石纳米切削和基于AFM的纳米刻划实验，获得加工参数和环境因素对纳米加工表面性能演变的影响规律。本课题的研究对于丰富和完善纳米加工基础理论具有重要的科学意义。

中文关键词： 纳米加工；表面性能；演变；分子动力学；蒙特卡罗方法

英文摘要： The surface properties of the workpiece have a major impact on the function and performance. The microscopic changes in the atoms migration of the super-smooth surfaces with nanometer machining accuracy will occur over time, space, and environmental factors. It has important theoretical significance and application value to study the variation of this process. Firstly, in this project, the molecular dynamics model of nano-machining process is established, the material mechanics and kinematics behavior in nano-machining process are studied using molecular dynamics simulation. Secondly, combining molecular dynamics and Monte Carlo methods, the stochastic dynamic model of nano-machined surface behavior evolution are established, in order to research the change mechanism of nano-machined surface properties in the geometry, mechanics, physics and chemistry, obtain the influence mechanism of processing parameters and environmental parameters on nano-machined surface properties and its change, and explore the evolution law of nano-machined surface properties. Finally, the experiments of single diamond nanocutting and nanoscratching based AFM are carried out, in order to get the influence law of processing parameters and environmental parameters on nano-machined surface properties evolution. The research has important scientific significance to enrich and improve the basic theory of nano-machining.

英文关键词： Nano-machining;Surface properties;Evolution;Molecular dynamics;Monte Carlo method