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<p>This study investigates the buckling and free vibration behaviour of epoxy composites reinforced with areca sheath particulates. The composites were fabricated using a diglycidyl ether of bisphenol-A (DGEBA)-based epoxy resin (Lapox L-12) with K-6 hardener. The influence of particulate size (75–600&#xa0;µm) and weight fraction (5–15&#xa0;wt.%) on the structural and dynamic performance of the composites under axial compressive loading was systematically evaluated. The objective is to determine the optimal combination of particulate size and content for improved structural stability and vibration resistance. The critical buckling load was estimated using the Double Tangent Method from load–deflection responses. In addition, the variation of natural frequency and damping characteristics under compressive loading was analysed. The results indicate that composites containing coarse particulates at 10&#xa0;wt.% exhibit superior buckling strength and natural frequency. Furthermore, a reduction in natural frequency was observed with increasing axial compressive load, indicating a corresponding decrease in structural stiffness.</p>

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Influence of Particle Size and Weight Fraction on the Structural Performance of Areca Sheath Particulate–Epoxy Composites

  • 期刊论文

  • 发表日期：

    2026年5月29日

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  • Lijo Varghese,
  • G. C. Mohan Kumar

摘要

This study investigates the buckling and free vibration behaviour of epoxy composites reinforced with areca sheath particulates. The composites were fabricated using a diglycidyl ether of bisphenol-A (DGEBA)-based epoxy resin (Lapox L-12) with K-6 hardener. The influence of particulate size (75–600 µm) and weight fraction (5–15 wt.%) on the structural and dynamic performance of the composites under axial compressive loading was systematically evaluated. The objective is to determine the optimal combination of particulate size and content for improved structural stability and vibration resistance. The critical buckling load was estimated using the Double Tangent Method from load–deflection responses. In addition, the variation of natural frequency and damping characteristics under compressive loading was analysed. The results indicate that composites containing coarse particulates at 10 wt.% exhibit superior buckling strength and natural frequency. Furthermore, a reduction in natural frequency was observed with increasing axial compressive load, indicating a corresponding decrease in structural stiffness.