Several molecular dynamics simulations are performed, in order to clarify the atomic-scale stick-slip phenomenon which is commonly observed in the surface measurement using an atomic fine microscope (AFM). In the molecular dynamics simulations, a specimen and a slider are assumed to consist of monocrystalline copper and rigid diamond, respectively, and a Morse potential is postulated between a pair of atoms. Atomic behavior in a plane corresponding to the (111) crystal plane is simulated, dealing with a planar strain problem where the effect of the three-dimensional interatomic force and the spring constant of the AFM cantilever are also taken into consideration. Influence of the cantilever stiffness and dynamics of the specimen surface atoms on the atomic-scale stick-slip phenomenon are investigated. The simulation confirms that the atomic-scale stick-slip phenomenon can be expressed by a molecular dynamics simulation and that the stick-slip phenomenon of the surface atoms of the specimen affects the stick-slip phenomenon of the spring force. These results indicate that molecular dynamics simulation has an advantage in deciding the spring constant of cantilevers.
A simulation method of cylindrical plunge grinding processes is described, which has considered successive change of workpiece shape due to core elements of grinding machine. Each element is modeled and integrated in the simulation procedure. The validity of the method is shown by comparing predicted and experimental results of grinding force histories, workpiece diameter histories and final workpiece shapes. The method is also applied to reduce grinding time by controlling infeed rate. The new process with reduced time is derived and the practicality of the method is verified by conducting experiments.
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