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Linking initial microstructure and local response during quasistatic granular compaction.

R C Hurley1, J Lind1, D C Pagan1

  • 1Physical and Life Sciences, Lawrence Livermore National Laboratory, Livermore, California 94550, USA.

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Summary
This summary is machine-generated.

Initial grain void space and coordination number predict areas prone to high force and strain during granular compaction. This research offers insights into material failure and compaction behavior.

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Area of Science:

  • Materials Science
  • Physics
  • Geology

Background:

  • Granular materials are ubiquitous in nature and industry.
  • Understanding compaction behavior is crucial for material design and geological processes.
  • Microstructure significantly influences macroscopic properties of granular materials.

Purpose of the Study:

  • To investigate the relationship between microstructure and local force/strain during quasistatic granular compaction.
  • To identify predictors of regions vulnerable to high stress and deformation.
  • To understand the microstructural origins of grain fracture.

Main Methods:

  • Combined three-dimensional X-ray diffraction and X-ray computed tomography.
  • Analyzed quasistatic granular compaction experiments.
  • Correlated microstructural features (void space, coordination number) with mechanical responses (force, strain).

Main Results:

  • Initial void space and coordination number predict regions of high force and strain.
  • Correlations observed between void space and coordination number, and between grain stress and interparticle force.
  • Fracturing grains exhibited above-average initial void space and below-average coordination number.

Conclusions:

  • Microstructure evolution during compaction can be quantitatively described.
  • A predictive approach for identifying vulnerable regions in granular materials is established.
  • Methods for inferring interparticle forces and coordination numbers from stress and porosity are provided.