Output details

Relation between the ratio of elastic work to the total work of indentation and the ratio of hardness to Young's modulus for a perfect conical tip

This paper presented a new nanoindentation model to overcome the limitations of the commonly used Oliver and Pharr method for deriving modulus and hardness values from nanoindentation tests. The paper shows that the Oliver and Pharr method is not accurate for very soft metals and very hard ceramics as a result of material pile-up and sink-in, and is also not generally accurate at small indentation depths as a result of tip blunting. The new model addresses these limitations, extending the range of materials for which it is possible to use nanoindentation to derive accurate modulus and hardness data.