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Related Concept Videos

Microcracking in Concrete01:20

Microcracking in Concrete

190
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
190

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Related Experiment Video

Updated: Aug 25, 2025

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation
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A Sensitive Frequency Range Method Based on Laser Ultrasounds for Micro-Crack Depth Determination.

Haiyang Li1, Wenxin Jiang1, Jin Deng2

  • 1Key Laboratory of Advanced Manufacturing Technology, North University of China, Taiyuan 030051, China.

Sensors (Basel, Switzerland)
|October 14, 2022
PubMed
Summary

This study introduces a laser ultrasonic technique to measure micro-crack depth using Rayleigh waves in the frequency domain. The method accurately quantifies crack depth by analyzing the sensitive frequency range, offering a robust non-destructive evaluation approach.

Keywords:
Rayleigh wavelaser ultrasonicssum of transmission coefficientssurface crack

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Area of Science:

  • Materials Science
  • Non-Destructive Testing
  • Acoustics

Background:

  • Surface cracks pose significant risks to material integrity.
  • Accurate measurement of micro-crack depth is crucial for structural health monitoring.
  • Existing methods for crack depth evaluation have limitations.

Purpose of the Study:

  • To propose and validate a novel laser ultrasonic method for determining micro-crack depth.
  • To investigate the relationship between Rayleigh wave characteristics and crack depth.
  • To establish a quantitative approach for non-destructive crack depth assessment.

Main Methods:

  • Development of a low-pass filter model for Rayleigh wave-surface crack interaction.
  • Analysis of the sensitive frequency range (stop band) for crack depth sensitivity.
  • Definition of a crack depth evaluation parameter based on transmission coefficients.
  • Validation using finite-element method (FEM) simulations and experimental aluminum-alloy samples.

Main Results:

  • The sensitive frequency range was identified as highly sensitive to surface crack depth.
  • A robust correlation was established between the evaluated parameter and crack depth.
  • FEM analysis confirmed the method's robustness against variations in measurement distance.
  • Experimental results demonstrated accurate crack depth estimation from 0.08 mm to ~0.5 mm.

Conclusions:

  • The proposed laser ultrasonic method effectively quantifies micro-crack depth using frequency-domain Rayleigh wave analysis.
  • This technique offers a reliable non-destructive approach for assessing surface crack dimensions.
  • The findings contribute to advanced materials characterization and structural integrity assessment.