ABSTRACT
Predicted stresses from the nanoindent morphologies were comparable with the bending stresses measured from curvature radii excepting in high stress regime above 400 MPa. A stress-induced change in the indentation strain was related to contact stress fields by considering elastic unloading or reloading pathway and finally predicted stresses from the indentation stress analysis were directly compared with empirically measured bending stresses. An elastic relationship between the contact stress and strain beneath an indenter at the peak indentation load is generally expressed for an indented surface subjected to residual stresses. The stress overestimation under high tensile stress might be discussed from an unexpected plastic zone expansion and significant elastic properties in the metallic glass sample. Conventional indentation approaches for measuring residual stress rely on a shape change in nanoindentation load-depth curve due to an application of surface residual stress. The predicted stress has a clear proportionality with the applied stress excepting in high stress regime above 400 MPa.
