Abstract
The formation of radial cracks from Vickers indentations on the surfaces of both unirradiated and irradiated samples of (As 1 − x Bi x ) 2Se 3 glasses with x ≤ 0.1 is investigated as a function of indentation load P. It was found that radial cracks around indentations are produced on the surfaces of all samples at loads exceeding a particular applied load P c app but this threshold load is higher by a factor of 15 to 30 from the value of P c calculated from the theoretical dependence of ratio c/ d of crack length c measured from the center of indentation impression to indentation impression diagonal d on applied load P. By fitting the experimental P( c 3/2) data in an expression relating c and P according to expanding cavity for elastic/plastic solid and from a theoretical expression relating load-independent hardness H and threshold load P c for crack formation estimated from the experimental data of the dependence of c/ d on P, the value of indentation fracture toughness K C of As 2Se 3 glasses, irrespective of Bi content in the samples and their irradiation, was found to be about 0.52 MPa⋅m 1/2.
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