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Wood products encompass a broad range of materials crafted from wood strands, veneers, lumber, and even waste wood-like shreds, designed for both structural and nonstructural purposes. Various specialized wood products have been developed to enhance strength, durability, and versatility in building applications.
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Related Experiment Video

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Author Spotlight: Enhancing Fiber Composite Laminate Quality with the Wet Hand Lay-Up/Vacuum Bag Process

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Published on: June 30, 2023

Lamb wave-based damage assessment for composite laminates using a deep learning approach.

Han Zhang¹, Fan Wang², Jing Lin³

¹Institute of Mechanics and Acoustics, National Institute of Metrology, Beijing 100029, China.

|May 1, 2024

Summary

A new deep learning model, CSCUNet, enhances ultrasonic Lamb wave analysis for detecting composite material damage. This method accurately identifies delamination location, size, and shape in composite laminates.

Keywords:

Composite material Damage assessment Deep learning Lamb wave Size evaluation

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Last Updated: Jun 27, 2025

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Published on: June 30, 2023

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Published on: February 11, 2016

Area of Science:

Materials Science
Non-destructive Testing
Artificial Intelligence

Background:

Composite materials are increasingly used for their advanced properties, necessitating robust structural health monitoring.
Lamb wave-based methods show promise for damage detection in composites, but quantitative characterization, especially of delamination, remains challenging.
Existing deep learning models often lack physical interpretability for damage assessment.

Purpose of the Study:

To propose a novel deep learning architecture, Convolutional Sparse Coding-based UNet (CSCUNet), for improved ultrasonic Lamb wave-based damage assessment in composite laminates.
To enhance the quantitative detection and characterization of delamination in multi-layered composite structures.
To improve the performance and physical interpretability of deep learning models for structural health monitoring.

Main Methods:

A low-resolution image of Lamb wave propagation is generated using the delay-and-sum algorithm.
A UNet architecture with an encoder-decoder framework is employed to transform low-resolution input to high-resolution damage images.
Multi-layer convolutional sparse coding blocks are integrated into the UNet encoder to boost performance and interpretability.

Main Results:

The CSCUNet effectively identifies the location, size, and shape of delamination in composite specimens.
The model demonstrates powerful feature extraction capabilities, leading to high-resolution damage imaging.
Enhanced interpretability allows for precise contour evaluation of composite material damage.

Conclusions:

The proposed CSCUNet offers an effective solution for ultrasonic Lamb wave-based damage assessment in composite laminates.
The integration of convolutional sparse coding significantly improves both the accuracy and interpretability of damage characterization.
This approach advances structural health monitoring for composite structures, ensuring their integrity and reliability.