Description of the Nanoindentation Unloading Behavior of Brittle Ceramics with a Modified Surface
The nanoindentation unloading behavior of some brittle ceramics with modified surfaces was analyzed. It was found that the unloading data may be described well with a quadratic polynomial. The physical meaning of the quadratic polynomial in describing the nanoindentation unloading behavior was then discussed by considering the effect of residual contact stress on the force-displacement relationship. It was suggested that the quadratic polynomial may be considered as a modified form of the basic forcedisplacement relationship for the contact of an isotropic elastic half-space by a rigid conical punch.
Wei Pan and Jianghong Gong
Z. H. Li et al., "Description of the Nanoindentation Unloading Behavior of Brittle Ceramics with a Modified Surface", Key Engineering Materials, Vols. 336-338, pp. 2422-2425, 2007