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Fiber-reinforced polymer (FRP) has been widely utilized for repairing steel structures because it has the advantages of high strength-to-weight ratios, easy construction processes, and exceptional resistance to corrosion and fatigue. However, the bond between FRP and steel can be vulnerable to variations in temperature, humidity, and both static and dynamic loads. One major problem in this bonded system is that debonding sometimes occurs at the interface between the FRP and structural surface, which is often subtle and difficult to detect and assess using current nondestructive testing methods. This study introduces a nonlinear guided wave method for assessing the bonding conditions in FRP-strengthened steel structures. The feasibility and sensitivity of guided wave for identification of debonding at the interface between FRP and steel were analyzed through numerical simulation methods. Initially, a three-dimensional (3D) finite element (FE) model was established to simulate guided wave propagation in intact FRP-strengthened steel plates (without debonding). The modal characteristics of the simulated guided wave signals were analyzed by calculating the phase and group velocities, which were then compared to analytical solutions. In addition, the wave structures of the simulated guided wave modes across the thickness of the specimens were investigated, confirming that normal excitation on the top surface of FRP-strengthened steel plates can predominantly generate the fundamental guided wave mode, known as B0 mode. Subsequently, simulations were carried out for FRP-strengthened steel plates with debonding to explore the interaction between the B0 wave and interfacial debonding. The results reveal that the nonlinear characteristics of guided waves, particularly second harmonics, are highly responsive to debonding at the FRP-steel interface. The findings can contribute to enhancing the current nondestructive testing techniques for FRP-reinforced structures, ultimately contributing to improved structural integrity and safety.

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Nondestructive Testing for Debonding in FRP-Strengthened Steel Plates Using Nonlinear Guided Waves

  • 会议论文

  • 发表日期：

    2025年

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  • Xianwen Hu,
  • Kai-Wen Chen,
  • Jun-Jie Zeng

摘要

Fiber-reinforced polymer (FRP) has been widely utilized for repairing steel structures because it has the advantages of high strength-to-weight ratios, easy construction processes, and exceptional resistance to corrosion and fatigue. However, the bond between FRP and steel can be vulnerable to variations in temperature, humidity, and both static and dynamic loads. One major problem in this bonded system is that debonding sometimes occurs at the interface between the FRP and structural surface, which is often subtle and difficult to detect and assess using current nondestructive testing methods. This study introduces a nonlinear guided wave method for assessing the bonding conditions in FRP-strengthened steel structures. The feasibility and sensitivity of guided wave for identification of debonding at the interface between FRP and steel were analyzed through numerical simulation methods. Initially, a three-dimensional (3D) finite element (FE) model was established to simulate guided wave propagation in intact FRP-strengthened steel plates (without debonding). The modal characteristics of the simulated guided wave signals were analyzed by calculating the phase and group velocities, which were then compared to analytical solutions. In addition, the wave structures of the simulated guided wave modes across the thickness of the specimens were investigated, confirming that normal excitation on the top surface of FRP-strengthened steel plates can predominantly generate the fundamental guided wave mode, known as B0 mode. Subsequently, simulations were carried out for FRP-strengthened steel plates with debonding to explore the interaction between the B0 wave and interfacial debonding. The results reveal that the nonlinear characteristics of guided waves, particularly second harmonics, are highly responsive to debonding at the FRP-steel interface. The findings can contribute to enhancing the current nondestructive testing techniques for FRP-reinforced structures, ultimately contributing to improved structural integrity and safety.