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<p>Cracks under coating in steel structures may significantly weaken the strength of structures and result in a potential risk to the structures. Hence, inspection of this kind of covered cracks is critical to the safety of the structures. In this study, inspection of covered cracks through eddy current pulsed thermography (ECPT) is investigated through numerical simulation and experiments. Specifically, the electromagnetic and thermal response of steel structures with covered cracks during induction heating is analyzed through numerical simulation. Specific thermal signatures resulting from covered cracks were analyzed based on the simulation results at the coating surface. ECPT experiments were implemented on coated steel specimens with covered cracks. Besides, the effects of crack dimensions on the temperature distribution are analyzed. Both simulation and experimental results demonstrate that the covered cracks result in anomalous temperatures at the coating surface during ECPT inspection. This thermal signature caused by the covered cracks can be captured during inspection and contributes to an effective quality evaluation of coated steel structures.</p>

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Inspection of covered cracks in coated steel structures using ECPT: numerical simulation and experimental investigation

  • 期刊论文

  • 发表日期：

    2025年4月7日

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  • Lina Chen,
  • Yubin Zhang,
  • Rui Liu,
  • Zhiyuan Zhang,
  • Qing Zhao,
  • Longbo Wang,
  • Pengqian Liu,
  • Linglin Chen,
  • Yage Han,
  • Jing Xie,
  • Changhang Xu

摘要

Cracks under coating in steel structures may significantly weaken the strength of structures and result in a potential risk to the structures. Hence, inspection of this kind of covered cracks is critical to the safety of the structures. In this study, inspection of covered cracks through eddy current pulsed thermography (ECPT) is investigated through numerical simulation and experiments. Specifically, the electromagnetic and thermal response of steel structures with covered cracks during induction heating is analyzed through numerical simulation. Specific thermal signatures resulting from covered cracks were analyzed based on the simulation results at the coating surface. ECPT experiments were implemented on coated steel specimens with covered cracks. Besides, the effects of crack dimensions on the temperature distribution are analyzed. Both simulation and experimental results demonstrate that the covered cracks result in anomalous temperatures at the coating surface during ECPT inspection. This thermal signature caused by the covered cracks can be captured during inspection and contributes to an effective quality evaluation of coated steel structures.