Vickers Indentation Behavior of Air-oxidized Graphite Materials

Abstract

Vickers indentation is applied to oxidized graphite materials for evaluating theiroxidizing behavior. An elastic-plastic analysis applicable to metals and ceramics cannot be applied to graphite materials. We propose a parameter, normalized dissipation energy, i.e., dissipation strength, which is defined as follows: the area encompassed by loading and unloading curves in the indentation process is divided by the maximum indented volume. The local oxidation behavior of graphite materials was successfully analyzed by this parameter.