Comparative Analysis of the Strain in Composite Rings Fabricated with Fibre Prestressing

Abstract. The presented work addresses issues related to the manufacturing and testing of composite rings made of glass fibres and epoxy resin. Rings equivalent to a segment of a composite tube were prepared for the study. During the winding process, the tension force of the fibre bundle was varied to induce pre-stresses. After curing the samples, fibre optic sensors containing Fiber Bragg Gratings (FBG) were attached to their outer surface. Subsequently, the rings were cut along the generator, resulting in noticeable displacements of the cut planes. Thanks to the sensors used, it was possible to determine the circumferential deformations induced by the initial stresses in the manufactured composites.