Abstract
The purpose of this study is to establish the influence of the stress state type and the sample sizes on the interrelationship between the acoustic quality factor Q and residual strength σr in the gypsum-containing rock of the Novomoskovskoye deposit (Russia) in mechanical fatigue tests. The aforementioned relationship for residual strength under uniaxial compression can be approximated to satisfactory accuracy by a logarithmic function and for the residual tensile strength by an exponential function. Cylindrical samples with a diameter of ∅30 and ∅80mm and aspect ratio 1:2 during compression, and with a ratio of height to diameter equal to 1 in tension were tested. For these dimensions, the size effect does not influence the interdependency σr(Q) under uniaxial tension, but does have an influence under uniaxial compression.
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