Analysis of Multi-Dislocation Nucleation in Nanoindentation
ZHANG Chuan li 1, NIE Guo hua 2 (1. College of Mechanical Engineering, Yangtze University, Jingzhou, Hubei 434023, China 2. Key Laboratory of Solid Mechanics of MOE, Institute of Applied Mechanics, Tongji University, Shanghai 200092, China)
Multi dislocation nucleation under an idealized nanoindenter was analyzed based on the Peierls Nabarro dislocation model. The boundary element method was employed to obtain the multi dislocation profiles that correspond to the discontinuous displacement between the adjacent atomic layers along the slip planes. The relationship of the load on the indenter and the surface displacement was also obtained. The effects of the film thickness on the nanoindentation were discussed based on the numerical results, and it is consistent with the experimental observation. By treating the surface as part of an infinite crack embedded in the infinite medium, a rather straightforward approach was adopted to account for the surface effect. This proposed method introduces atomic scale features into the simulation of a continuum approach, which provides a powerful tool to analyze the multi scale structure.
【CateGory Index】： TB383