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This study evaluates the effectiveness of externally bonded ultra-high modulus (UHM) carbon fibre-reinforced polymer (CFRP) plates in the fatigue life extension of steel plates with simulated fatigue cracks using different lengths of CFRP. The study investigates bond lengths approximately 1.0 and 2.5 times the effective development length of the CFRP-steel system. Digital image correlation (DIC) and beach marking techniques were used to track fatigue crack propagation. This study found that a maximum fatigue life extension ratio (FLER) of 2.53 was observed in a steel plate with 25% initial cross-sectional area loss and retrofitted with a 300 mm long UHM CFRP plate (i.e. a bond length of 150 mm) applied to a single side of the plate.

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Influence of Bond Length on the Fatigue Repair of Cracked Steel Plates Using Ultra-high Modulus CFRP

  • 会议论文

  • 发表日期：

    2025年

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  • Gavin Li,
  • Amir Fam,
  • Joshua Woods,
  • Brahim Benmokrane

摘要

This study evaluates the effectiveness of externally bonded ultra-high modulus (UHM) carbon fibre-reinforced polymer (CFRP) plates in the fatigue life extension of steel plates with simulated fatigue cracks using different lengths of CFRP. The study investigates bond lengths approximately 1.0 and 2.5 times the effective development length of the CFRP-steel system. Digital image correlation (DIC) and beach marking techniques were used to track fatigue crack propagation. This study found that a maximum fatigue life extension ratio (FLER) of 2.53 was observed in a steel plate with 25% initial cross-sectional area loss and retrofitted with a 300 mm long UHM CFRP plate (i.e. a bond length of 150 mm) applied to a single side of the plate.