Análisis del esfuerzo de umbral crítico de metamaterial híbrido para mamparos en cascos de GFRP

Abstract

CONDITION FOR PROJECT PUBLICATION. This research analyzes the structural behavior of hybrid reinforcements applied to glass fiber reinforced polymer (GFRP) bulkheads. The main objective is to determine the influence of a corrugated brass core on the global stiffness of the bulkhead using a metamaterial approach to optimize maritime structural efficiency and stability. Ten specimens were manufactured using the hand lay-up technique, five of which were modified by incorporating a metallic core. Mechanical tests were performed on a SHIMADZU UH-F500 kNX universal testing machine, applying an axial compression load with a one-millimeter blade to evaluate resistance to mode II delamination through cohesive zone model principles. The results showed that modified specimens reached critical threshold stresses of up to 23 N/mm², significantly exceeding the 17 N/mm² observed in the control group. Furthermore, an increase in average fracture energy was recorded, rising from 3.49 J to 12.65 J. It is concluded that the use of hybrid metamaterials considerably improves the system's resistance and energy performance. The metallic core contributes to structural stability, although its effectiveness depends on the quality of interfacial adhesion. Keywords: Stability, Energy, Delamination, Cohesive.