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<p>This research investigates the influence of KOH-silane treated flax fiber and surface modified <i>Passifloraedulis</i>husk powder (PEHP) on the mechanical performance and microstructural characteristics of vinyl ester composites. A systematic variation in filler loading (RF0-RF3) was employed to evaluate tensile, flexural, compressive, interlaminar shear strength (ILSS), hardness, impact and drilling induced damage behaviour. The results indicate a progressive improvement in strength and stiffness with increasing filler content up to RF2, where tensile strength (131 ± 3.1&#xa0;MPa), flexural strength (153 ± 3.8&#xa0;MPa), compressive strength (142 ± 3.2&#xa0;MPa), and ILSS (34 ± 0.9&#xa0;MPa) reached maximum values. SEM analysis confirms that this enhancement was associated with uniform filler dispersion, reduced interfacial voids and effective stress transfer between matrix, fiber and filler. However, further increase in filler loading (RF3) led to particle agglomeration resulting in marginal reductions in strength despite increased hardness. Drilling performance and dimensional stability improved progressively with filler addition, although the gains at higher loading were accompanied by a shift toward stiffness dominated behaviour. Within the investigated formulations, RF2 demonstrated the most balanced mechanical performance.</p>

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Performance evaluation of vinyl ester composites reinforced with surface-modified flax fiber and Passifloraedulis husk powder: mechanical, in-plane shear, and machining aspects

  • 期刊论文

  • 发表日期：

    2026年5月23日

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  • E. Raja Sherin,
  • Mathi Kannaiyan,
  • Gokuldass R,
  • Somasundaram S

摘要

This research investigates the influence of KOH-silane treated flax fiber and surface modified Passifloraedulishusk powder (PEHP) on the mechanical performance and microstructural characteristics of vinyl ester composites. A systematic variation in filler loading (RF0-RF3) was employed to evaluate tensile, flexural, compressive, interlaminar shear strength (ILSS), hardness, impact and drilling induced damage behaviour. The results indicate a progressive improvement in strength and stiffness with increasing filler content up to RF2, where tensile strength (131 ± 3.1 MPa), flexural strength (153 ± 3.8 MPa), compressive strength (142 ± 3.2 MPa), and ILSS (34 ± 0.9 MPa) reached maximum values. SEM analysis confirms that this enhancement was associated with uniform filler dispersion, reduced interfacial voids and effective stress transfer between matrix, fiber and filler. However, further increase in filler loading (RF3) led to particle agglomeration resulting in marginal reductions in strength despite increased hardness. Drilling performance and dimensional stability improved progressively with filler addition, although the gains at higher loading were accompanied by a shift toward stiffness dominated behaviour. Within the investigated formulations, RF2 demonstrated the most balanced mechanical performance.