Mechanics of Deformable Solids 
DOI: http://www.dx.doi.org/10.24866/2227-6858/2020-1-4

Komarov A., Kshnyakin A., Masiulla A., Tsuprik V.

ALEXEY KOMAROV, Postgraduate, e-mail: komarov.ai@dvfu.ru
ANTON KSHNYAKIN, Postgraduate, Assistant, e-mail: kshnyakin_ayu@dvfu.ru
ABDUL MASIULLA, Postgraduate, e-mail: arash786masi@gmail.com
VLADIMIR TSUPRIK, Candidate of Engineering Sciences, Head of the Department, e-mail: tsuprik.vg@dvfu.ru
Department of Building Structures and Materials, School of Engineering
Far Eastern Federal University
8 Sukhanova St., Vladivostok, Russia, 690091

Energy intensity of destruction of autoclaved aerated concrete
during uniaxial compression

Abstract: Today’s conventional criteria in the mechanics of material fracture are based on Griffith's energy concept. This concept constitutes that specific limit state in the material around the tip of a single crack occurs when the rate of elastic energy growth and the rate of its absorption in bounded areas around the material’s internal structural defect are equal. Yet, for complex composite materials such as concrete the practical possibility of applying these criteria remains controversial due to considerable heterogeneity and significant number of structural defects. Seeing as the energy nature of destruction is fair and obvious for any materials including concretes, there must be an energy criterion of destruction, which states the fact of destruction as a result of integral accumulation and dissipation of external elastic energy within the strained material volume saturated with multiple cracks (defects) of random directions, nature and sizes. The proposed effective specific energy of destruction of the aerated concrete as a model material is viewed not only as a parameter to evidence the accomplished fact of strained material volume destruction, but also as a feature outlining the process of accumulation and dissipation of energy in such a deformable volume. To determine the possible range of the investigated value for cellular concrete, a factorial experiment was performed with variation of such factors as density, loading speed and water saturation. The type of dependence of energy consumption for destruction of a cubic sample in time when exposed to various factors determines the specific mechanism of destruction of this material – viscous or brittle, and describes the process of accumulation of defects in the process of increasing elastic deformation till the moment of destruction.
Keywords: energy intensity of aerated concrete destruction, destruction criterion, specific accumulation of defects.

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