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A Method to Estimate Cadaveric Femur Cortical Strains During Fracture Testing Using Digital Image Correlation
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Fracture toughness testing using photogrammetry and digital image correlation.

Wen Hao Kan1,2, Carlos Albino3, Daniel Dias-da-Costa4

  • 1Australian Centre for Microscopy and Microanalysis, The University of Sydney, NSW 2006, Australia.

Methodsx
|October 27, 2018
PubMed
Summary
This summary is machine-generated.

Digital Image Correlation (DIC) can now accurately track small displacements in metallic specimens without speckle patterns. A downscaled photogrammetry technique enhances crack mouth opening displacement (CMOD) measurements for fracture toughness testing.

Keywords:
Digital image correlation (DIC)Digital image correlation with photogrammetryFracture toughnessHigh chromium white cast ironMetal matrix compositePhotogrammetry

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Optical Measurement Techniques

Background:

  • Digital Image Correlation (DIC) is a key optical technique for measuring displacement fields.
  • Traditional DIC relies on speckle patterns, which can limit accuracy for small-scale displacements.
  • Notched metallic specimens offer natural features for DIC, simplifying setup for fracture toughness tests.

Purpose of the Study:

  • To improve the accuracy of DIC for measuring small-scale displacements.
  • To adapt photogrammetry for precise crack mouth opening displacement (CMOD) tracking in metallic fracture tests.
  • To eliminate the need for artificial speckle patterns in DIC analyses.

Main Methods:

  • Downscaling a photogrammetry technique from large-scale concrete crack tracking.
  • Applying the technique to notched metallic specimens under three-point bending.
  • Automatically relating pixel coordinates to real-world coordinates for accurate displacement measurement.

Main Results:

  • Successfully enabled accurate tracking of small-scale displacements using DIC.
  • Demonstrated the efficacy of the downscaled photogrammetry technique for CMOD measurement.
  • Validated the method's ability to leverage natural specimen features, negating the need for speckle patterns.

Conclusions:

  • The adapted photogrammetry technique significantly enhances DIC accuracy for small displacements.
  • This method simplifies fracture toughness testing by utilizing inherent specimen geometry.
  • The study presents a robust approach for precise CMOD measurement in metallic materials.