Structural Damage and Parametric Analysis of Hybrid CFRP I‐Beams Synergistically Reinforced With Metal Mesh

ABSTRACT Considering the interlaminar delamination, fiber breakage, and strength attenuation under impact loads, the present work systematically investigates the synergistic effects of aluminum mesh characteristics (pore size, thickness, and laying position) and impact level on the mechanical properties of hybrid CFRP I‐beams. A series of hybrid CFRP/aluminum mesh specimens were prepared using hot‐pressing technology, subsequently combined with successive low‐velocity impact (LVI) and four‐point bending tests, revealing the failure mechanism of hybrid I‐beams. The microscopic inspection further reveals that the failure mode of hybrid I‐beams mainly consists of matrix failure, fiber fracture, and interlaminar delamination near the impact area. A denser aluminum mesh exhibits better mechanical resistance and superior energy absorption levels. Meanwhile, the damage suppression of upper/lower symmetrical layup is significantly improved compared to single‐sided layup, resulting in optimal flexural strength. As the impact energy increases, the synergy effects of CFRP/aluminum mesh become remarkable. This research could provide a reference basis for designing hybrid CFRP/aluminum mesh I‐beam structures.