Modeling of the Metal Cutting Process Using Molecular Dynamics (MD) Simulation

9523551 Komanduri分子动力学模拟是在原子的时空尺度上进行的，求解分子动力学方程是在原子的时空尺度上进行的，利用使原子结合在一起的基本力求解运动方程。这是一个内存和时间密集的计算，在今天的计算机技术下是可行的。在一些科学和工程领域，这种模拟方法已经使用了很多年，但分子动力学在理解金属切削过程方面仍然是相对较新的。本文主要研究了单晶金刚石切削刃对各种材料的纳米加工。分子动力学模型将包括传统的加工参数。详细的尺度允许研究亚表面损伤和晶体取向和缺陷结构的影响。此外，还可以重新审视加工铁时金刚石工具的磨损，以及切削刃离开工件时发生的出口故障。利用扫描电子显微镜内的纳米级加工装置，将进行实验来补充和验证分子动力学建模预测。这项研究的主要影响将是建立研究基础设施，以获得对纳米级加工的基本理解。这将为微尺度精密部件和系统的工艺设计提供技术优势。＊＊＊

9523551 Komanduri Molecular dynamics simulation is done on the temporal and spatial scale of atoms, and solves the equations of Molecular dynamics simulation is done on the temporal and spatial scale of atoms, and solves the equations of motion using the fundamental forces that hold atoms together. This is a memory and time intensive computation that is feasible with today's computer technology. In some fields of science and engineering this simulation approach has been used for a number of years, but molecular dynamics is still relatively new in understanding metal cutting processes. This research focuses on nano machining of various materials with single crystal diamond cutting edges using both a simulation and experimental approach. The molecular dynamics models will include the traditional machining parameters. The detailed scale allows the investigation of subsurface damage and the effects of crystallographic orientation and defect structure. In addition, it is possible to take a new look at the wear of diamond tools when machining iron, and the exit failures that occur when a cutting edge leaves a workpiece. Using a nanometer scale machining setup inside a scanning electron microscope, experiments will be conducted to complement and verify the molecular dynamics modeling predictions. The major impact of this research will be in building the research infrastructure to gain a fundamental understanding of machining at the nano level. This will give a technological edge in the design of processes for micro scale precision components and systems. ***