An analysis of interface "fiber-matrix" effect on the strengh properties of FPCM DUROSTON

The paper presents the results of an analysis of the mechanical properties of FPCM "Duroston" used in power electronics for manufacturing of support-fixing elements. The tests were conducted to determine the effects of interfaces "fiber-matrix" on the strength properties of FPCM. Mechanical tests were done in the temperature range from 20 °C to 200 °C on tensile and compression of the specimen. Using scanning electron microscopy, the authors studied the microstructure of FPCM in the areas of destruction. The analysis showed that the compressive deformation delaminates FPCM by cracking, which will determine the nature of the layered swarm structure of the fiberglass. It has been established that at room temperature the predominant mechanism of cracking is adhesive fiber peeling from the polymer matrix, and at high temperatures in the given interval, along with the mechanism of adhesion, separation occurs as a cohesive rupture of the matrix polymer.