Abstract
Increasing interest in environmental protection leads to a search new technologies and attempts to revive old technologies for obtaining and processing materials. Environmentally friendly technologies have become more than popular. Currently produced shoes with uppers made of felt and felt satisfy the consumer in design, internal shape, appearance, and some other indicators, however, the issue of increasing the heat-shielding properties of the seams connecting the upper parts is still relevant. One of the disadvantages of the thread method of assembling a shoe upper blank from felt is heat loss through the seams, insufficient strength, and water permeability. Thread-free methods for connecting parts of shoe uppers can eliminate these disadvantages. The object of study was the technological process of gluing parts of shoe uppers made of felt. The subjects of the study are finished shoes and external parts of felt shoe uppers. The advantages of adhesive assembly of felt shoe upper blanks are considered. It is hypothesized that the adhesive assembly method will preserve the heat-protective and strength properties of felt shoes. To assess the bonding strength of parts, felt samples were glued together with a polychloroprene adhesive solution and examined for delamination. To evaluate the modeling of the delamination process, the theory of crack formation and the adhesive separation model were applied. The finite element method was used to simulate the dynamics of separation of one surface from another. The conducted studies and calculations have proven that when felt samples delaminate, the stress is concentrated in the vicinity of the tear-off point, and then gradually decreases in sections of the tear-off length, where the adhesive resistance force ceases to act. The results of modeling the delamination process were used to predict the behavior of adhesives during the operation of felt shoes under different conditions.
Published Version
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