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Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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An Optical Crack Growth Sensor Using the Digital Sampling Moiré Method.

Xinxing Chen1, Chih-Chen Chang2, Jiannan Xiang3

  • 1Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Hong Kong, China. xchenak@connect.ust.hk.

Sensors (Basel, Switzerland)
|October 18, 2018
PubMed
Summary
This summary is machine-generated.

A new optical sensor uses the digital sampling moiré (DSM) method for precise 2D crack growth monitoring in concrete structures. This advanced sensor offers higher sensitivity and simpler application compared to traditional methods.

Keywords:
2D crack growthcalibrationconcrete crackdigital sampling moiréoptical crack growth sensor

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Optical Metrology

Background:

  • Accurate crack growth measurement is vital for assessing the structural integrity of concrete.
  • Existing methods, like normalized cross-correlation (NCC), have limitations in sensitivity, calibration, and robustness.

Purpose of the Study:

  • To develop and validate a novel optical crack growth sensor for high-accuracy two-dimensional (2D) monitoring.
  • To leverage the digital sampling moiré (DSM) method for enhanced crack detection and measurement.

Main Methods:

  • Development of an optical sensor employing the digital sampling moiré (DSM) technique.
  • Utilizing digital image processing to generate moiré fringes for displacement measurement.
  • Comparing the DSM sensor's performance against traditional photogrammetric algorithms like NCC.

Main Results:

  • The DSM-based sensor demonstrates higher sensitivity and lower computational cost than NCC methods.
  • The sensor achieves accurate 2D displacement measurements without prior calibration, simplifying practical use.
  • Enhanced robustness to variations in imaging distance was observed, crucial for crack monitoring.

Conclusions:

  • The developed DSM-based optical sensor offers significant advantages for 2D crack growth monitoring in concrete structures.
  • This technology simplifies application and broadens the scope for structural health assessment.
  • Validation through numerical simulation and laboratory tests confirms the sensor's efficacy.