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M. Davarpanah, G. Somodi, L. Kovács and B. Vásárhelyi

.97 419.2 UCS, uniaxial compressive strength Table 1 summarizes the value of elastic modulus ( E ), crack damage stress (σ cd ), uniaxial compressive strength (σ c ), Poisson’s ratio (ν), crack initiation stress (σ ci ), axial failure strain (ε a, max ), maximum volumetric strain (ε cd ), crack initiation strain (ε ci ) and M R for each of the studied 50 samples. The values of elastic modulus ( E ) and Poisson’s ratio (ν) were calculated by using linear regressions along linear portions of stress–axial strain curves and radial strain–axial strain curves