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<p>This article presents a numerical and experimental investigation of the application of vibration-based damage detection methods for quantifying delamination and fibre breakage in laminated composite structures. Modal curvature, enhanced irregularity, and a Harr index have been utilised to run the signal processing analysis. Numerically, the carbon fibre reinforced polymer is simulated in the software “ABAQUS 6.14-1” to show the effects of the damaged areas on the modal characteristics of laminated composite structures. Due to the well-known effect of damage that reduces local stiffness in mechanical structures, fibre breakage is simulated by assuming the mechanical properties of the matrix (epoxy) in the damaged areas, while the delaminated areas are represented by adding a very thin layer with the mechanical properties of the unperforated release film to separate the adjacent layers. Within this framework, an analysis of delamination and fibre breakage is presented, which to the best of our knowledge has not been previously investigated. </p>

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Modal Curvature and Enhanced Irregularity: Advanced Indices for Assessing Damage in CFRP Laminates

  • 期刊论文

  • 发表日期：

    2025年6月5日

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  • Ahmed N. Uwayed,
  • Ahmed Mouthanna,
  • Mujtaba A. Flayyih

摘要

This article presents a numerical and experimental investigation of the application of vibration-based damage detection methods for quantifying delamination and fibre breakage in laminated composite structures. Modal curvature, enhanced irregularity, and a Harr index have been utilised to run the signal processing analysis. Numerically, the carbon fibre reinforced polymer is simulated in the software “ABAQUS 6.14-1” to show the effects of the damaged areas on the modal characteristics of laminated composite structures. Due to the well-known effect of damage that reduces local stiffness in mechanical structures, fibre breakage is simulated by assuming the mechanical properties of the matrix (epoxy) in the damaged areas, while the delaminated areas are represented by adding a very thin layer with the mechanical properties of the unperforated release film to separate the adjacent layers. Within this framework, an analysis of delamination and fibre breakage is presented, which to the best of our knowledge has not been previously investigated.