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Microcracking in Concrete

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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...

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Updated: Jun 4, 2025

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation

Published on: September 29, 2019

Quantitative Detection Method for Surface Angled Cracks Based on Laser Ultrasonic Full-Field Scanning Data.

Chenwei Wang¹, Rui Han¹, Yihui Zhang¹

¹State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China.

Sensors (Basel, Switzerland)

|December 17, 2024

Summary

This summary is machine-generated.

This study introduces a quantitative method using laser ultrasonics to detect angled cracks in machinery. The technique accurately measures crack width, angle, and length, enhancing equipment safety and predicting service life.

Keywords:

full-field scanning data laser ultrasonic quantitative detection method surface angled crack

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Area of Science:

Materials Science
Mechanical Engineering
Non-Destructive Testing

Background:

Surface angled cracks in critical machinery components pose significant operational safety risks.
Early detection of these cracks is crucial for preventing catastrophic failures.

Purpose of the Study:

To propose and validate a quantitative detection method for surface angled cracks using full-field scanning data.
To accurately determine crack width, angle, and length for improved component assessment.

Main Methods:

Utilizing laser ultrasonics to acquire full-field scanning data.
Analyzing ultrasonic signal propagation, including Rayleigh waves, to quantify crack characteristics.
Investigating near-field and far-field ultrasonic wave behavior and employing computational methods for angle and endpoint determination.

Main Results:

Experimental validation demonstrated high accuracy, with errors within 5% for width, angle, and length measurements.
The method successfully quantifies surface angled cracks on critical components.
Identified critical points differentiating near-field and far-field ultrasonic wave propagation.

Conclusions:

The proposed quantitative detection method is feasible and effective for surface angled cracks.
This technique enables comprehensive component condition assessment, service life prediction, and operational risk mitigation.
Potential applications include aircraft engine blade and gear inspection.