Authors: V.L. Fedyaev, E.R. Galimov, A.V. Belyaev, Sirotkina

Title of the article: Influence of the porosity of technical materials on their strength properties

Year: 2023, Issue: 2, Pages: 28-35

Branch of knowledge: 2.5.6. Engineering technology

Index UDK: 620.22

DOI: 10.26730/1999-4125-2023-2-28-35

Abstract: The article deals with porous technical materials – solids, consisting of a base (framework, matrix) and a set of cavities (pores), in which there can be vacuum (highly rarefied gas), a gaseous medium, a vapor-gas mixture, and also liquid. A classification of these materials is proposed, their specific properties and their wide application in many sectors of the economy are indicated. The main ones are mechanical, strength properties, such as elasticity, brittleness, plasticity, tensile strength, compression, and fatigue strength of these materials. It takes into account the fact that these properties depend on internal factors, such as the chemical composition of the components of materials, their structure, including porosity, as well as on the totality of external factors that are differentiated into atmospheric (intensity of solar radiation, temperature, humidity, atmospheric pressure) and proper operational ones. It is assumed that these factors affect the mechanical properties of the porous material through both porosity and the mechanical properties of the frame material. There are two extreme cases: performance is mainly affected by internal and atmospheric factors; extreme external factors are dominant. Using the principle of additivity (superpositions), the ratios are written in general form to assess the properties of the materials under consideration, and the variants of approximation of the corresponding dependencies are named

Key words: porous technical materials classification of materials mechanical properties external at-mospheric and operational factors evaluation of properties generalized dependencies

Receiving date: 19.11.2022

Approval date: 10.05.2023

Publication date: 15.06.2023

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