Formation of the porosity of basalt-plastic composite materials during climate tests under the conditions of the North
Currently, basalt-plastic composite materials are widely used in various branches of industry. As practice shows, during the operation of products made of basalt-plastic composite materials, their reliability and durability are significantly influenced by the natural and climatic conditions of the external environment. The problem of ensuring high service properties of basalt-plastic composite materials is especially clearly manifested during the operation of products in the areas with extreme climatic conditions. This determines the urgency of carrying out full-scale climatic tests of basalt-plastic composite materials under the climatic conditions of the North and the Arctic. In this work, the formation of porosity during climatic tests of basalt-plastic composite materials was investigated by means of hydrostatic weighing. It is shown that during climatic degradation of a composite material in the North, there is a significant increase in its open porosity. On the basis of the theory of Markov chains, a statistical model of the formation of porosity during climatic tests of basalt-plastic composite materials with cylindrical and planar symmetry is developed. Calculations of the porosity of the layers of a basalt-plastic composite material with uniform degradation from the outer surface were carried out. As the number of tests increases, porosity spreads to the inner layers. With a long test duration, the distribution of the porosity of the layers approaches the limiting linear or uniform laws, depending on the shape of the basalt-plastic composite material.