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Related Experiment Video

Updated: Jan 29, 2026

Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation

Evgenii Malitckii1, Heikki Remes2, Pauli Lehto2

  • 1Department of Mechanical Engineering, Aalto University School of Engineering; evgeny.malitskiy@aalto.fi.

Journal of Visualized Experiments : Jove
|February 9, 2019
PubMed
Summary

A new method measures deformation at the sub-grain level to understand how microstructure affects small fatigue crack growth. This reveals crack retardation and strain localization, aiding in developing better fatigue propagation models.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Solid Mechanics

Background:

  • Microstructural features significantly influence fatigue crack behavior, especially for microstructurally small fatigue cracks.
  • Understanding sub-grain level deformation is crucial for accurate fatigue crack growth prediction.
  • Existing methodologies often lack the resolution to capture localized phenomena at the crack tip.

Purpose of the Study:

  • To develop and apply a novel measurement approach for analyzing cumulative deformation fields at the sub-grain level.
  • To investigate the influence of microstructure on the growth of microstructurally small fatigue cracks.
  • To provide fundamental insights into small fatigue crack propagation mechanisms in polycrystalline materials.

Main Methods:

  • Utilized a unique patterning technique with a 10 µm speckle size for high-resolution strain field analysis.
  • Applied the methodology to body-centered cubic (bcc) Fe-Cr ferritic stainless steel with large grain sizes.
  • Measured crack growth retardation events and localized shear strain zones ahead of the crack tip.

Main Results:

  • Successfully revealed cumulative deformation fields at the sub-grain level.
  • Observed and measured small fatigue crack growth retardation events.
  • Identified intermittent shear strain localization zones correlated with grain orientation and size.

Conclusions:

  • The developed methodology enables detailed analysis of sub-grain deformation influencing small fatigue crack growth.
  • Insights gained are vital for developing more robust theoretical models for fatigue crack propagation.
  • This approach enhances fundamental understanding of fatigue mechanisms in materials.