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Updated: Jan 10, 2026

Cutting Procedures, Tensile Testing, and Ageing of Flexible Unidirectional Composite Laminates

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Published on: April 27, 2019

Optimizing the Tensile Performance of Repaired CFRP Laminates with Different Patch Parameters Using a Surrogate-Based

Zhenhua Yin¹, Haoying Wei¹, Zhenyu Ma¹

¹School of Mechatronics Engineering, Henan University of Science and Technology, Luoyang 471003, China.

Materials (Basel, Switzerland)

|November 27, 2025

Summary

This study uses nonlinear Lamb waves to detect microdamage in repaired carbon fiber structures. Optimal patch design minimizes nonlinear coefficients, enhancing tensile performance and capturing repair effectiveness.

Keywords:

CFRP laminates nonlinear lamb wave optimization patch repair tensile damage

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Published on: January 29, 2020

Area of Science:

Materials Science
Nonlinear Acoustics
Structural Health Monitoring

Background:

Carbon fiber-reinforced polymer (CFRP) structures are susceptible to tensile-induced microdamage.
Patch repair is a common method to restore the integrity of damaged CFRP structures.
Assessing the effectiveness of patch repairs and detecting underlying microdamage is crucial for structural safety.

Purpose of the Study:

To employ nonlinear Lamb wave-based higher harmonic detection for assessing tensile-induced microdamage in patch-repaired CFRP structures.
To optimize external repair design parameters to minimize nonlinear coefficients and improve tensile performance.
To investigate the influence of patch design parameters on nonlinear acoustic responses and damage detection.

Main Methods:

Nonlinear Lamb wave propagation analysis under varying tensile displacements.
Finite-element modeling validated by experimental results.
Analysis of secondary and tertiary nonlinear coefficients based on patch radius, thickness, and rotation angle.
Latin hypercube experimental design and Diffuse Approximation for multiparameter optimization.

Main Results:

The finite-element model accurately predicted nonlinear Lamb wave behavior in repaired CFRP.
Patch design parameters significantly influence nonlinear coefficients and damage detection sensitivity.
Optimal patch parameters were identified to enhance tensile performance and repair effectiveness.
Successful multiparameter optimization of patch repair structures was achieved.

Conclusions:

Nonlinear Lamb wave higher harmonic detection is effective for microdamage assessment in repaired CFRP.
Optimized patch design parameters are critical for improving structural integrity and repair efficacy.
The study provides a valuable reference for engineering applications involving multiparameter optimization of patch repair structures.