Fracture toughness under different temperature effects

The study addresses the fracture toughness KIC of rock sample from Pavlovskoe deposit, Novaya Zemlya archipelago, in cyclic freeze–thaw tests. The testing samples were half-cylinders with a cut made in the center of a sample in perpendicular to its diameter. From the cores with the diameter D = 63 mm, the disks with the thickness t = 25 mm were cut out as per ISRM. They were cut into two equal parts at the tolerable deviation from the centerplane not more than by 0.2 mm. The fracture-simulating cut depth a obeyed the condition 0,4 ≤ a/R ≤ 0,6 (R – the diskradius). The manufactured samples were saturated with water for 24 h and then were frozen. Freezing lasted for 6 hours in refrigerators in two regimes: at -20ºС and at -50ºС. After freezing, the halfcylinders were placed in tanks filled with water for not less than 2 h, up to total thawing. All in all, 10 and 20 cycles were carried out. The temperature erosion studies reveal a decrease in the fracture toughness of the rock samples. After 10 and 20 cycles of freezing at -20ºС, the samples show the decrease in the fracture toughness by 9% and 28%, respectively. Even lower temperature has a higher impact on the test parameter. For instance, after 10 and 20 cycles of freezing at -50ºС, the decrease in the fracture toughness of the samples reaches 23% and 32%, respectively.

Cherepetskaya E. B., Bezrukov V. I. Fracture toughness under different temperature effects. MIAB. Mining Inf. Anal. Bull. 2023;(1):49-58. [In Russ]. DOI: 10.25018/0236_ 1493_2023_1_0_49.

E.B. Cherepetskaya¹, Dr. Sci. (Eng.), Professor, e-mail: eb.cherepetskaya@misis.ru, ORCID ID: 0000-0002-9642-2149,
V.I. Bezrukov¹, Student, e-mail: bezrukov.vi@misis.ru, ORCID ID: 0000-0001-6081-6616,
¹ Mining Institute, National University of Science and Technology «MISiS», 119049, Moscow, Russia.

V.I. Bezrukov, e-mail: bezrukov.vi@misis.ru.

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