Fracture of Quasi-Brittle Geomaterial with a Circular Hole under Non-Uniformly Distributed Compression
S. V. Suknev
Chersky Institute of Mining of the North, Siberian Branch, Russian Academy of Sciences, Yakutsk, 677980, Russia
Keywords: хрупкое разрушение, квазихрупкое разрушение, геоматериалы, масштабный эффект, концентрация напряжений, отверстие, нелокальные критерии разрушения, brittle fracture, quasi-brittle fracture, geomaterials, size effect, stress concentration, hole, nonlocal fracture criteria
Abstract
The influence of hole diameter on the fracture of quasi-brittle geomaterial in the stress concentration zone under non-uniformly distributed compression has been studied theoretically and experimentally taking into account the size effect. The failure load is determined using modified nonlocal criteria which are the development of the average stress criterion, the point stress criterion, and the fictitious crack criterion, and which contain a complex parameter that characterizes the size of the fracture process zone and takes into account not only the material structure, but also the plastic properties of the material, the geometry of the sample, and its loading conditions. The calculation results are compared with experimental data.
|
