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Purpose <p>This study aimed to characterize the vibrational behavior of damaged Carbon Fiber-Reinforced Polymer (CFRP) plates repaired with adhesively bonded composite patches. The primary goal was to evaluate the repair’s effectiveness in restoring dynamic properties, with a specific focus on damping performance and the influence of patch characteristics.</p> Methods <p>The research combined experimental and numerical methods. First, the mechanical properties of the materials were determined through tensile and three-point bending tests. Experimental modal analysis was then conducted using an impact hammer and accelerometers to obtain Frequency Response Functions (FRFs) for intact, damaged, and repaired plates under free-free and clamped-free boundary conditions. These experimental results were used to validate a finite element model developed in ABAQUS to simulate the dynamic response and analyze stress distributions.</p> Results <p>The results demonstrated that the patch repair significantly enhances structural damping, with a measured damping coefficient of approximately 0.32. The natural frequencies decreased for damaged plates but were partially restored after repair. The CFRP patch with a (45/-45) ply orientation was found to be the most effective configuration, exhibiting superior vibration damping and the lowest stress concentrations in the adhesive layer—20% lower than the GFRP patch. Furthermore, the study established that the damping effectiveness is contingent upon the integrity of the adhesive’s properties.</p> Conclusions <p>Bonded composite patching is a highly effective method for repairing damaged CFRP structures, successfully restoring stiffness and, crucially, enhancing the capacity to dissipate vibrational energy. The (45/-45) CFRP patch is identified as the optimal configuration, minimizing critical interfacial stresses and thereby promising greater long-term durability. This research provides validated design guidelines for high-performance repairs, underscoring the importance of patch material and lay-up orientation in aerospace and mechanical applications.</p>

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Experimental and Numerical Study of the Vibration Behavior of a CFRP Plates Repaired with a Bonded Composite Patch and its Adhesive

  • 期刊论文

  • 发表日期：

    2026年1月13日

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  • Amin Houari,
  • Hakim Siguerdjidjene,
  • Ahmed Chellil,
  • Salah Amroune,
  • Mohamed Slamani,
  • Oueld mohamed Farouk,
  • Borhen Louhichi,
  • Mohamad A. Alawad

摘要

Purpose

This study aimed to characterize the vibrational behavior of damaged Carbon Fiber-Reinforced Polymer (CFRP) plates repaired with adhesively bonded composite patches. The primary goal was to evaluate the repair’s effectiveness in restoring dynamic properties, with a specific focus on damping performance and the influence of patch characteristics.

Methods

The research combined experimental and numerical methods. First, the mechanical properties of the materials were determined through tensile and three-point bending tests. Experimental modal analysis was then conducted using an impact hammer and accelerometers to obtain Frequency Response Functions (FRFs) for intact, damaged, and repaired plates under free-free and clamped-free boundary conditions. These experimental results were used to validate a finite element model developed in ABAQUS to simulate the dynamic response and analyze stress distributions.

Results

The results demonstrated that the patch repair significantly enhances structural damping, with a measured damping coefficient of approximately 0.32. The natural frequencies decreased for damaged plates but were partially restored after repair. The CFRP patch with a (45/-45) ply orientation was found to be the most effective configuration, exhibiting superior vibration damping and the lowest stress concentrations in the adhesive layer—20% lower than the GFRP patch. Furthermore, the study established that the damping effectiveness is contingent upon the integrity of the adhesive’s properties.

Conclusions

Bonded composite patching is a highly effective method for repairing damaged CFRP structures, successfully restoring stiffness and, crucially, enhancing the capacity to dissipate vibrational energy. The (45/-45) CFRP patch is identified as the optimal configuration, minimizing critical interfacial stresses and thereby promising greater long-term durability. This research provides validated design guidelines for high-performance repairs, underscoring the importance of patch material and lay-up orientation in aerospace and mechanical applications.