Fatigue Strength of Foamed Polymers

Russian Journal of Building Construction and Architecture. 2022. No. 4(56). P. 29–38.

E. Yu. Bobrova, Popov I. I., A. D. Zhukov, Ganzhuntsev M. I.

The resistance of foamed polymers to various types of loads is determined by the density of the material, its structure and the rigidity of the polymer matrix, as well as the nature of the porosity of the material. Foamed polymers with a polymodal cellular porosity structure show their resistance to a greater extent under various loading methods. There are changes in the macrostructure that occur with an increase in the density of foams, which lead to a change in the ratio of the geometric parameters of structural elements, a decrease in the size of the cells and, in the aggregate, to a decrease in their "flexibility". As a result, the cushioning properties of the cells deteriorate resulting in brittle fracture and reduced endurance of the foam. Monolithic polymers are less resistant to the action of dynamic loads, and, from this perspective, as the density of foam plastics increases, their performance under cyclic loading is increasingly approaching the performance of monolithic plastics. The results obtained are quite regular and are in full agreement with modern ideas about the relationship between the structure and properties of polymeric materials

Keywords: прочность, Strength, temperature effects, foamed polymers, вспененные полимеры, wind pulsation, cyclic loads, foam fatigue, температурный эффект, ветровые нагрузки, циклические нагрузки