Problems of Young’s modulus evaluation by using nanoindentation

Abstract

The slope and curvature of unloading, which are usually utilized for Young’s modulus evaluation, are affected by not only the Young’s modulus of a material indented but also its Piosson’s ratio, yield stress, the Young’s modulus and truncated geometry of a pyramidal indenter, and so on. The latter effects cannot be compensated enough by using conventional analysis, for example Oliver&Pharr method. A novel analysis for the proper evaluation of Young’s modulus was attempted by using the finite element method.