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Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
Published on: January 16, 2019
High-Resolution Crack Localization Approach Based on Diffraction Wave.
Weilei Mu1, Jiangang Sun2, Guijie Liu3
1Shandong Provincial Key Laboratory of Ocean Engineering, Ocean University of China, Qingdao 266100, China. tblueapple@126.com.
This study introduces a new crack localization method using diffraction wave theory to image crack endpoints, overcoming limitations of previous hole-damage detection techniques for structural monitoring.
Area of Science:
- Structural Health Monitoring
- Non-Destructive Testing
- Wave Propagation
Background:
- The delay-and-sum imaging algorithm is effective for hole-like damage localization.
- Cracks are more prevalent structural damage than holes.
- Existing methods struggle with accurate crack endpoint detection.
Purpose of the Study:
- To develop a crack localization approach capable of imaging crack endpoints.
- To improve upon existing methods for detecting crack-like damages.
Main Methods:
- Utilizing diffraction wave theory for crack endpoint imaging.
- Employing a line sensor array to record diffraction waveforms.
- Applying dispersion and half-wave compensation for enhanced accuracy.
Main Results:
- Successfully imaged crack endpoints with high resolution.
- Demonstrated the effectiveness of the diffraction wave-based approach.
- Validated the method through an experimental example.
Conclusions:
- The proposed method accurately localizes crack endpoints.
- This technique offers a significant advancement for crack detection and structural monitoring.

