MATERIAL TESTING BY THE METHOD OF DYNAMIC INDENTATION

This paper discusses the application of the dynamic indenter in materials testing where the brief shock loading gives rich information about material properties. The Hertz theory of elasticity has been used to provide analytical expressions for the calculation of a plasto-elastic strain produced by the shock interaction of a hemispheric indenter on a test piece. Using a measurement of the indentation as a function of the velocity change on impact with the material under test, the Meyer's hardness diagrams as a function of deformation on impact are plotted. Experimental results of the testing of steel samples with homogeneous and non homogeneous properties as a function of depth are presented.