Determining The Quality Of Composite Structures Made In Ultrasonic Field By Infrared Thermal Imaging

Abstract

Composite structures represent at the present time and will represent even more in the future a field of study both theoretically and practically of the utmost importance taking into account strategic or economic applications of great importance. The composite structures made by depositing several layers of resin and sand (1….3 mm) on a cylindrical metal support represent applications used in the industry to manufacture the tractor rollers of the conveyor belts, the rollers from the brake stands for inspection of automobiles and different others composite structures. This type of structures subject to high tangential and shearing forces must have a high durability over time because changing them is very difficult. Research presents, an attempt to improve the quality of these structures by depositing and solidifying them in an ultrasonic field. Ultrasonic vibrations have multiple properties, including improving the adhesion between the layers of composite structures, uniforming the deposits and shortening the resin cross-linking time. Research presents the FEM simulation of vibration modes for the ultrasonic transducer used in experimental new technology of composite structure manufacturing. The structure made is subjected to a control by infrared thermography in order to observe possible defects and to compare it with traditional technology.