Evaluación estructural y diseño optimizado de laminados compuestos con refuerzo de fibra de aramida

Abstract

CONDITION FOR PUBLICATION OF PROJECT. The prevention of delamination phenomena in glass fiber–reinforced composite materials is a critical aspect to ensure structural integrity and service life of components subjected to cyclic and dynamic loading, particularly in naval applications. In this context, experimental results obtained from specimens manufactured using traditional fabrication methods show that the interlaminar shear strength exhibits a nonlinear dependence on the density of aramid stitching incorporated as interlaminar reinforcement. At low stitch densities, the apparent interlaminar shear stress obtained from flexural tests progressively decreases, reaching a minimum value at approximately 6.67 stitches per square centimeter. Beyond this critical density, interlaminar strength increases steadily due to a more effective deposition of aramid fibers through the laminate thickness. Direct interlaminar shear tests, interpreted using the cohesive zone model, confirmed this behavior, with increases of up to 25% in failure stress observed at the highest stitch densities. The resilience energy reached its maximum value at a stitch density close to 6.67 stitches per square centimeter, highlighting the influence of interlaminar reinforcement on the energy absorption capacity of sthe laminate. Keywords: Aramid, Composite, Debonding, Delaminaition, Stitching.