Nanoindentation as a probe for rresidual stress

摘要

This work explores the use of nanoindentation as a tool for probing residual stresses in materials. The effect of applied or residual stresses on measured indentation hardness is established citing an example of indentation of a high C steel with varied applied stress and by giving indentation hardness results for #alpha# -brass residually stressed by rolling. The Von Mises yield criterion was used to establish a quantitative relation between stress and measured hardness by examining microindentation and nanoindentation hardness results for a residually stressed Mo/Ti multilayer. Nanoindentation results for a SiC/Ti-15V-3Al-3Cr-3Sn continuously reinforced metal matrix composite are consistent with relaxation of the bulk residual stresses at the surface due to debonding of the fiber-matrix interface where it intersects the free surface.