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<p>Fiber Metal Laminates (FMLs) have emerged as advanced hybrid materials that combine the lightweight advantages of fiber composites with the structural stability of metal layers, making them attractive for automotive, aerospace, defense, and construction applications. However, achieving strong interfacial adhesion between natural fibers, fillers, and metal layers remains a significant challenge. This study focuses on enhancing the performance of natural fiber–based FMLs reinforced with prestressed areca nut fibers, SS316 foil, and nanosilica fillers through silane surface treatment. The 3-aminopropyltriethoxysilane (3-APTES) coupling agent was employed to promote Si–O–Si bonding and improve compatibility within the epoxy matrix. Laminates were fabricated using vacuum bagging and post-cured at 130&#xa0;°C to achieve improved stability. Among all compositions, the laminate containing 40 vol.% silane-treated prestressed areca fiber, SS316 foil, and 2.0 vol.% nanosilica exhibited superior performance, achieving tensile and flexural strengths of 162&#xa0;MPa and 182&#xa0;MPa, along with enhanced shear properties and reduced drilling-induced damage. SEM analysis confirmed uniform nanosilica dispersion, reduced voids, and stronger fibre–matrix interaction. Overall, the combined use of surface treatment, nanosilica reinforcement, and natural fibers effectively improves the mechanical, shear, and machining performance of FMLs.</p>

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Effect of Interfacial Adhesion Enhancement on SS316 Foil/Prestressed Areca Fiber–Nanosilica Fiber Metal Laminate Composites

  • 期刊论文

  • 发表日期：

    2025年12月4日

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  • E. Balakrishnan,
  • G. Yuvaraj,
  • Trinath Keerthipalli,
  • Raghuram Pradhan,
  • S. K. Karthikeyan,
  • Srinivas Tadepalli

摘要

Fiber Metal Laminates (FMLs) have emerged as advanced hybrid materials that combine the lightweight advantages of fiber composites with the structural stability of metal layers, making them attractive for automotive, aerospace, defense, and construction applications. However, achieving strong interfacial adhesion between natural fibers, fillers, and metal layers remains a significant challenge. This study focuses on enhancing the performance of natural fiber–based FMLs reinforced with prestressed areca nut fibers, SS316 foil, and nanosilica fillers through silane surface treatment. The 3-aminopropyltriethoxysilane (3-APTES) coupling agent was employed to promote Si–O–Si bonding and improve compatibility within the epoxy matrix. Laminates were fabricated using vacuum bagging and post-cured at 130 °C to achieve improved stability. Among all compositions, the laminate containing 40 vol.% silane-treated prestressed areca fiber, SS316 foil, and 2.0 vol.% nanosilica exhibited superior performance, achieving tensile and flexural strengths of 162 MPa and 182 MPa, along with enhanced shear properties and reduced drilling-induced damage. SEM analysis confirmed uniform nanosilica dispersion, reduced voids, and stronger fibre–matrix interaction. Overall, the combined use of surface treatment, nanosilica reinforcement, and natural fibers effectively improves the mechanical, shear, and machining performance of FMLs.