Abstract
The issue of assessing the stress state of protective and decorative coatings, depending on the porosity in the contact zone "coating-substrate" is considered. Several schemes are considered: the absence of pores, the pores are filled with a paint composition, the pores are not filled with a paint composition. To assess the stress state of the coatings, the SCAD Office software module is used. It has been established that the presence of pores in the contact zone leads to the appearance of a more inhomogeneous stress state. When a pore is filled with a paint composition, the maximum stresses in the coating occur in the zone of contact between the coating and the substrate. In the absence of filling the pores with paint, the maximum stresses occur on the surface of the coating. The influence of the substrate on the change in the values of internal thermal stresses is revealed. Stresses in coatings on a claydite-concrete substrate are significantly lower compared to the use of heavy concrete as a substrate. The ratio of maximum thermal stresses and long-term cohesive strength is analyzed. It is established that cracking is possible in the polymer lime coating from the action of temperature stresses in the period from August to January
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