Honeycomb sandwich panels offer excellent stiffness-to-weight ratios, making them common in aerospace, automotive, and renewable energy structures, yet they are prone to face sheet buckling and core crushing under bending. This study explores using recycled carbon fiber non-woven tissue (rCF NWT) as an interlayer in glass fiber reinforced polymer face sheets to enhance performance and promote fiber reuse. Long beam flexural tests and linear-elastic FEM analysis showed that rCF NWT increased flexural rigidity, maximum load, and energy absorption without adding significant thickness and weight. Strain measurements revealed lower tension- and compression-side strains and suppression of tension-side softening beyond ~0.2% strain. The interlayer delayed failure and suppressed core buckling but shifted the dominant damage mode from global buckling and core crushing to interfacial delamination within the face sheets with face sheet–core separation. These results show that rCF NWT improves the flexural performance and damage tolerance of honeycomb panels while enabling carbon fiber recycling.
FIKRY et al. (Fri,) studied this question.
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