Abstract
Hardness measurement of particulate matters has been carried out using the compression and stress relaxation test. In order to discuss the influence of particle size and particle shape, seven types of glass powder were used in the experiment. In this method, there was a region in which the applied pressure was linearly related to the displacement at the initial stage of compression. We applied Rumpf equation and Hertz equation to the proportional region and determined the constant k′ in Hertz equation. The constant k′ is independent of the particle size, showing that the hardness of particles can be reasonably evaluated by this method.
