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Impact Damage Detection in Patch-Repaired CFRP Laminates Using Nonlinear Lamb Waves.

Zhenhua Yin1, Cheng Li1, Ying Tie1

  • 1School of Mechanical and Power Engineering, Zhengzhou University, Science Road 100, 450001 Zhengzhou, China.

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Summary
This summary is machine-generated.

Researchers investigated repairing carbon fiber-reinforced polymer (CFRP) damage using patches. They found an optimal circular patch size (2.5r radius) enhances impact resistance and repair effectiveness for aircraft structures.

Keywords:
CFRP laminatesfinite element analysisimpact behaviornonlinear Lamb wavepatch-repair technique

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Area of Science:

  • Materials Science
  • Aerospace Engineering
  • Non-destructive Testing

Background:

  • Carbon fiber-reinforced polymer (CFRP) laminates are crucial in aircraft but vulnerable to low-velocity impact (LVI) damage.
  • Effective repair strategies and methods to assess repair efficacy under LVI are critical for structural integrity.

Purpose of the Study:

  • To investigate the repair effectiveness of LVI-damaged CFRP laminates using various patch sizes.
  • To develop and validate an integrated numerical procedure for predicting nonlinear Lamb wave behavior in repaired CFRP.

Main Methods:

  • Experimental and numerical nonlinear Lamb wave analyses were employed.
  • An integrated numerical procedure combining LVI simulation and nonlinear Lamb wave detection was developed.
  • Relative Acoustic Nonlinearity Parameters (RANPs) were used to evaluate damage in simulations.

Main Results:

  • The integrated numerical procedure was validated against drop-weight impact tests and a nonlinear ultrasonic system.
  • An optimal circular patch size (2.5r radius) was determined through interpolation, optimizing absorbed energy and delamination.
  • Key parameters like RANPs demonstrated consistent trends, serving as effective indicators of impact damage.

Conclusions:

  • The developed numerical procedure accurately predicts nonlinear Lamb wave behavior in repaired CFRP.
  • Optimal patch design is crucial for enhancing impact resistance and repair performance in CFRP structures.
  • Nonlinear Lamb wave analysis, using parameters like RANPs, is a viable method for assessing impact damage and repair effectiveness.