Nanoindentation of model diamond nanocomposites: Hierarchical molecular dynamics and finite-element simulations

摘要: Complementary molecular dynamics (MD) and finite-element (FE) simulations of model diamond nanocomposites (MDN) subjected to nanoindentation were undertaken understand how contact behavior pertaining the surface morphology MDN surfaces can be spanned from continuum scale. The MD determined that inside region is influenced by atomic-scale features on tip surface, indent location, grain tilt roughness surfaces. In addition, if treated as a within FE simulations, same orientations, similar elastic properties are used for both there reasonable agreement between pressures relatively low indentation loads shallow substrates. For larger loads, deviate somewhat results near center contact. length scales prohibitive models (e.g., deep substrates) was also examined using simulations. This allowed detailed investigation conditions stick-slip events evolve function pressure stresses.