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This paper investigates the effects of fibre angle orientation on the failure behaviour and natural frequencies of Graphite/Epoxy laminates under uniaxial tension. The laminate under consideration consisted of 24 layers, with the layup of [θ4, 0, − θ4]s and fibre angle, θ, was varied from 0° to 90°. The minimum load for layer failure was determined using Maximum Stress Theory, while natural frequencies were also measured. Numerical validations confirmed the finite element models’ accuracy. Results showed that increasing the fibre angle from 0° to 90° decreased laminate strength (1450 to 257 MPa) and increased Mode 3 natural frequencies (1053 to 1640 Hz), with Modes 1 and 2 behaving differently. This study enhances understanding of the relationship between failure behaviour and natural frequencies in composite laminates.

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The Effects of Fibre Angle Orientation to the Failure Behaviour and Natural Frequencies of Graphite/Epoxy Laminates Under Uniaxial Tension

  • 会议论文

  • 发表日期：

    2025年

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  • Abdul Azim Taredi,
  • Mohd Nor Azmi Ab Patar,
  • Jamaluddin Mahmud

摘要

This paper investigates the effects of fibre angle orientation on the failure behaviour and natural frequencies of Graphite/Epoxy laminates under uniaxial tension. The laminate under consideration consisted of 24 layers, with the layup of [θ4, 0, − θ4]s and fibre angle, θ, was varied from 0° to 90°. The minimum load for layer failure was determined using Maximum Stress Theory, while natural frequencies were also measured. Numerical validations confirmed the finite element models’ accuracy. Results showed that increasing the fibre angle from 0° to 90° decreased laminate strength (1450 to 257 MPa) and increased Mode 3 natural frequencies (1053 to 1640 Hz), with Modes 1 and 2 behaving differently. This study enhances understanding of the relationship between failure behaviour and natural frequencies in composite laminates.