DEVICE FOR AUTOMATED TESTING OF EPOXY COMPOSITE COATINGS FOR THE STRENGTH OF ADHESIVE BONDS

Abstract

Modern industry in Ukraine involves complex extreme operating conditions for various mechanisms and machines in the open air, including cyclical temperature changes. In this area of research, the creation of effective protection systems is perspective. From a scientific point of view, the use of adhesive-strength coatings made of various materials depending on their functional purpose is interesting in this area of research, which determines the use of different methods for their formation. The most technologically advanced in terms of forming protective coatings from these materials, operation and restoration are epoxy composites with a wide range of functional characteristics. One of the main characteristics mentioned is the strength of the adhesive bonds of such coatings to the working surfaces of parts. The strength of adhesive joints is determined by the amount of separation of cylindrical metal samples glued together. The accuracy of determining these characteristics depends significantly on the accuracy of the direction of force application relative to the adhesive joint. This indicator is influenced by the total error in the technological chain, in the system: "fixed gripper on a tensile testing machine (fastening error) - the shank of one of the cylindrical samples on the side of the fixed gripper of the tensile testing machine (manufacturing error of the shank relative to the axis of the cylindrical sample) - cylindrical sample on the side of the movable gripper (error of mutual positioning of two cylindrical samples in the adhesive joint area, error of manufacturing the shank of the specified cylindrical sample and error of its fastening on the movable gripper). The development of a device that will reduce the total error in the aforementioned system will increase the accuracy of determining the adhesive characteristics of coatings, including when testing multilayer coatings on metal surfaces.