the hardness of a composite comes from the interface behaviour, the matrix and the particles. so while carrying out the nanoindentation how to find out where the nanoindenter is hitting. is it hitting the interface,matrix or the particle
With the new advancements in nanoindentation, you can perform 3D property mapping of the are of interest. It will help you identify the regions of matrix, interface and fiber very easily. Please see more information at http://www.nanoscience.com/applications/ceramics-and-composites/mechanical-property-mapping-composites/.