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<p>The influence of repair parameters on the restoration of tensile properties in damaged glass fibre-reinforced polymer (GFRP) composites was investigated using a plug and patch repair technique. Unidirectional GFRP laminates were intentionally damaged by drilling holes of different diameters and repaired using chopped strand mat (CSM) plugs of varying fibre volume fraction and patches. The effects of hole diameter, fill type, and fibre volume fraction were analysed using response surface methodology based on a central composite design. The repaired laminates achieved a maximum tensile strength restoration of 87.5% with a plug and single patch configuration at 30% fibre volume fraction. Failure progression initiated at stress concentration zones near the hole, followed by interfacial debonding and fibre fracture with longitudinal splitting. Acoustic emission (AE) analysis indicated enhanced energy absorption, increased event counts, and delayed fibre failure in repaired specimens. AE peak frequency ranges corresponding to matrix cracking, debonding, and fibre failure were comparable to those of pristine laminates, accompanied by 30.51% increase in AE counts, confirming improved damage tolerance and structural stability of the repaired GFRP composites.</p>

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Influence of Repair Parameters on Tensile Property Restoration and Acoustic Emission Response of Repaired GFRP Laminates

  • 期刊论文

  • 发表日期：

    2026年1月29日

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  • T.G. Loganathan,
  • K. Vinoth Kumar,
  • Venkatachalam Gopalan,
  • Samarjit Singh,
  • C. Hemadri

摘要

The influence of repair parameters on the restoration of tensile properties in damaged glass fibre-reinforced polymer (GFRP) composites was investigated using a plug and patch repair technique. Unidirectional GFRP laminates were intentionally damaged by drilling holes of different diameters and repaired using chopped strand mat (CSM) plugs of varying fibre volume fraction and patches. The effects of hole diameter, fill type, and fibre volume fraction were analysed using response surface methodology based on a central composite design. The repaired laminates achieved a maximum tensile strength restoration of 87.5% with a plug and single patch configuration at 30% fibre volume fraction. Failure progression initiated at stress concentration zones near the hole, followed by interfacial debonding and fibre fracture with longitudinal splitting. Acoustic emission (AE) analysis indicated enhanced energy absorption, increased event counts, and delayed fibre failure in repaired specimens. AE peak frequency ranges corresponding to matrix cracking, debonding, and fibre failure were comparable to those of pristine laminates, accompanied by 30.51% increase in AE counts, confirming improved damage tolerance and structural stability of the repaired GFRP composites.