A Novel Approach To Hardness Testing

This paper gives a description of the application of a simple rebound time measuring device and relates the deterrniniition of relative hardness of a variety of common engineering metals. A relation between rebound time and hardness will be sought; hardness is the ability of a material to resist permanent deformation and is typically quantified by relating the geometry of an indentor and normal force applied to the depth of penetration. The effect of specimen geometry and surface condition will also be discussed in order to acquaint the student with the problems associated with rebound hardness testing.