Flexural response of patch repaired composite cantilever beams loaded in edgewise direction

Damage compromises the structural integrity of composites, posing major safety risks. The damaged structures must be repaired in order to increase their lifespan, avoid premature replacement, and save money. This study examines the efficacy of various repair strategies by analyzing the effects of several parameters, including hole size, hole position, filler material type, and repair method, on the structural response of undamaged, damaged (with holes), and repaired composite beams. The preliminary parametric tests are used to identify the specimen with the critical hole size and position. The effectiveness of the repair procedures is then evaluated using this identified specimen. The specimens repaired with epoxy that contains carbon fiber microparticles are stiffer than those repaired with epoxy that contains SiO2 nanoparticles. Specimens repaired with epoxy containing chopped glass fibers combined with SiO2 nanoparticles or carbon fiber microparticles show a lower peak load than those repaired with epoxy with chopped glass fibers alone. Repairing using a plug composed of layers of epoxy-impregnated fabric ensures a more robust load distribution than repairing with a plug made out of parent laminate. In edgewise bending, the plug serves as the primary load-carrying element, with the patching having little effect.