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<p>Natural fibre-reinforced polymer composites (NFRPCs) are sustainable alternatives to synthetic laminates; conversely, their structural reliability is influenced by type of fibre, fibre orientation and stacking architecture. In this work, ten sample laminate configurations (S1–S10) with Flax (F), Hemp (H), and Kenaf (K) fibres were fabricated using a hand lay-up method with single-layer (SL), double-layer (DL), and alternating-layer (AL) sequences under 0/90° and ± 45° orientations. Mechanical properties, namely tensile, flexural, and compressive strengths, were experimentally evaluated. The double-layer 0/90° configuration (S7) demonstrated optimal mechanical performance, achieving Tensile, Flexural, and Compressive strengths of 57.13&#xa0;MPa, 60.50&#xa0;MPa, and 638.63&#xa0;MPa, respectively. Shifts in the laminate orientation from 0/90° to ± 45° resulted in tensile reductions of up to 54%, thereby enhancing shear-dominated stress redistribution. A mechanics-informed Structural Performance Index (SPI) framework was developed, incorporating normalised tensile, flexural, and compressive responses into application-specific structural indicators. The SPI-based evaluation recognised S7 as the best arrangement for structural and crash-dominant scenarios (SPI = 0.99), whereas kenaf-dominant laminates (S5) were recommended for the stiffness-oriented applications. The proposed SPI methodology delivers a decision tool that associates experimental characterisation and reliability-driven laminate selection for multi-axial engineering applications.</p>

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Integrated multi-assessment and structural performance index framework for stacking-sequence optimisation of natural fibre reinforced laminates

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月29日

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  • R. Jayendra Bharathi,
  • T. Panneerselvam,
  • N. Sathiya Narayanan

摘要

Natural fibre-reinforced polymer composites (NFRPCs) are sustainable alternatives to synthetic laminates; conversely, their structural reliability is influenced by type of fibre, fibre orientation and stacking architecture. In this work, ten sample laminate configurations (S1–S10) with Flax (F), Hemp (H), and Kenaf (K) fibres were fabricated using a hand lay-up method with single-layer (SL), double-layer (DL), and alternating-layer (AL) sequences under 0/90° and ± 45° orientations. Mechanical properties, namely tensile, flexural, and compressive strengths, were experimentally evaluated. The double-layer 0/90° configuration (S7) demonstrated optimal mechanical performance, achieving Tensile, Flexural, and Compressive strengths of 57.13 MPa, 60.50 MPa, and 638.63 MPa, respectively. Shifts in the laminate orientation from 0/90° to ± 45° resulted in tensile reductions of up to 54%, thereby enhancing shear-dominated stress redistribution. A mechanics-informed Structural Performance Index (SPI) framework was developed, incorporating normalised tensile, flexural, and compressive responses into application-specific structural indicators. The SPI-based evaluation recognised S7 as the best arrangement for structural and crash-dominant scenarios (SPI = 0.99), whereas kenaf-dominant laminates (S5) were recommended for the stiffness-oriented applications. The proposed SPI methodology delivers a decision tool that associates experimental characterisation and reliability-driven laminate selection for multi-axial engineering applications.