EXPERIMENTAL SIMULATION OF TENSILE FRACTURING INITIATION FROM A CIRCULAR CAVITY
S. V. Suknev
Chersky Institute of Mining of the North, Siberian Branch, Russian Academy of Sciences, Yakutsk, Russia
Keywords: Сжатие, геосреда, цилиндрическая полость, квазихрупкое разрушение, масштабный эффект, градиентный критерий, Compression, geomedium, cylindrical cavity, quasi-brittle fracture, size effect, stress gradient criterion
Abstract
The paper presents results of the experimental studies on tensile fractures formation in the geomedium with a cylindrical cavity and subjected to non-uniformly distributed compression. The hole diameter was found to have a significant effect on the local strength of the material. The new criterion proposed for quasi-brittle fracturing contains a complex parameter that characterizes the size of the pre-fracture zone and accounts not only for the material’s microstructure, but also for its plastic properties, as well as for geometry of the cavity, and loading conditions. Calculation results are in good agreement with the experimental data.
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