Abstract
Hardness is defined as a phenomenological measure of resistance of a material to shear stresses under local volume compression. It is shown that this definition may serve as a theoretical basis for existing empirical relationships between the Vickers microhardness HV and the various phenomenological, packing density-sensitive parameters of non-crystalline materials, including among them, the internal pressure, the glass transition temperature Tg, the excess enthalpy, and the free volume fraction at Tg.
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