فهرست نشریات علمی دسترسی آزاد ایران

In this study, the bending behavior of sandwich structures was investigated in both integrated and separate configurations. The structures featured honeycomb and re-entrant cores made from thermoplastic materials, Polylactic Acid (PLA) and Acrylonitrile Butadiene Styrene (ABS), fabricated using a 3D printer. Additionally, samples with composite facesheets, produced from glass fibers combined with chopped PLA or ABS filaments, were fabricated using a hot press machine. The composite facesheets, comprising two layers of glass fibers, were incorporated to enhance strength and resistance to environmental factors. The use of recyclable and remanufacturable structures contributes to environmental protection, pollution reduction, and lower production costs. The core dimensions were 15×50×160mm, with a facesheet thickness of 1.5mm. The weight of the sandwich structures ranged from approximately 42 to 70 grams, depending on the core geometry and facesheets used. In total, 24 samples underwent a three-point bending test, and 4 samples were subjected to a tensile test to determine the mechanical properties of the sandwich panels. The elastic modulus for PLA, ABS, composite PLA, and composite ABS samples was 2.83, 2.40, 24.71, and 23.82GPa, respectively. The bendingtest results indicated that samples with re-entrant cores withstood higher loads compared to those with honeycomb cores. The maximum load-bearing capacity and energy absorption of the composite-faced samples were superiorto both the integrated and separate samples. Furthermore, the composite, separate, and integrated samples exhibited greater deflection, respectively, and failed later.