Micro-Mechanical Behavior of HOPG In Nano-Indentation

摘要

The mechanical behavior of highly oriented pyrolytic graphite (HOPG) has been investigated in thisrnpaper, by simulating a machining process in a nano-indent test with the method of molecular dynamics (MD) andrnby doing an experiment directly using the probe tip of atomic force microscope (AFM) as tool. According to therncharacteristics and properties of graphite crystal lattice which have been discussed in the paper, three potentialsrnare selected for different interaction between graphite atoms in the molecular dynamic calculations. Also,rnexperiments for nano-indentation of graphite crystal and its observation are carefully carried out, and results arernconsequential measured by AFM. The topography of the hole indented by the tip, the profile, surface of therngraphite, as well the indented force and the strength of HOPG are measured and calculated. Results show thernindentation experiment and the MD calculation consistent with each other, that MD may be a good tool forrncomprehending the micro-machining behavior and the mechanism of materials.