System Analysis Methods of Relaxation and Recovery Properties of Polymer Textile Materials for Technical Purposes
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Fibre Chemistry, Vol. 52, No. 3, September, 2020 (Russian Original No. 3, May-June, 2020)
SYSTEM ANALYSIS METHODS OF RELAXATION AND RECOVERY PROPERTIES OF POLYMER TEXTILE MATERIALS FOR TECHNICAL PURPOSES A.V. Demidov, N.V. Pereborova, A.G. Makarov, and S.V. Kiselev
UDC 539.434: 677.494
The present paper describes system-analysis methods for describing relaxation and recovery properties of polymer textile materials for technical purposes developed on the basis of mathematical modeling and computer prediction. Polymer textile materials for technical purposes are increasingly being used in various sectors of technology. This has caused an increasing interest in the study of their functional and performance properties. During the operation, important functional properties of polymer textile materials for technical purposes involve their relaxation and recovery properties. For this reason, special attention should be paid to the study of these properties in such materials using mathematical modeling and system analysis.
In research related to the functional and operational properties of polymer textile materials, studies are carried out in which hereditary mechanics equations are applied. Since the main differences between the proposed solutions are due to their complexity, special attention should be paid to those solutions where the selected equations are physically valid and use the minimum number of parameters [1, 2]. It should be noted that studying the manifestations of the mechanical properties of such materials under operating conditions is much more challenging than measuring only the tensile characteristics in the absence of an objective assessment of the material properties. The task becomes significantly more complicated when, in addition to viscoelastic properties, plastic properties appear in polymer textile materials, i.e., it is necessary to pay attention to the appearance of an irreversible deformation component [3-5]. When, in addition to comparing the mechanical properties of materials, it is necessary to perform calculations for the operating conditions of products, the solution of such a problem for polymer textile materials is of particular value. Without measuring such simple processes as creep, relaxation, and recovery, it is not possible to obtain a solution to this problem. When studying the functional and operational properties of polymer textile materials, the following research areas deserve special attention [6-8]: – analysis of the general case of the manifestation of a material’s rheological properties, when all the components of deformation (elastic, viscoelastic, and plastic) are present; development of new methods for studying viscoelasticity based on mathematical modeling of deformation processes; – development of methods for predicting deformation processes occurring under the repeated action of load or stress under conditions where an irreversible deformation component appears; – analysis of the sufficiency of short-term measurements of creep, relaxation, and recovery for predic
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