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A Method for Studying the Temperature Dependence of Dynamic Fracture and Fragmentation
09:12

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Published on: June 28, 2015

Explosively driven fragmentation of granular materials.

Kun Xue1, Fangfang Li, Chunhua Bai

  • 1State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, 100081 Beijing, China. xuekun@bit.edu.cn

The European Physical Journal. E, Soft Matter
|August 31, 2013
PubMed
Summary
This summary is machine-generated.

Wet sand flows more easily than dry sand under explosive forces, contrary to common belief. Adding oil further reduces fragment size, impacting sand dynamics and instability.

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Area of Science:

  • Geophysics
  • Materials Science
  • Fluid Dynamics

Background:

  • Understanding the behavior of granular materials like sand under extreme conditions is crucial for various applications.
  • Previous assumptions suggested wet sand would offer greater resistance to explosive forces than dry sand.

Purpose of the Study:

  • To investigate the explosively driven dynamics of dry and wet sand under high strain rates.
  • To analyze the effect of interstitial oil on sand fragmentation and instability.
  • To develop a model predicting the instability onset of expanding sand shells.

Main Methods:

  • Experimental investigation of explosively driven sand dynamics.
  • High strain rate loading (10^4 s^-1) applied to dry and wet sand samples.
  • Development and application of a kinetic instability model.

Main Results:

  • Wet sand exhibits reduced flow resistance compared to dry sand under high strain rates.
  • Interstitial oil significantly reduces fragment size, with average mass reduced to 60% of dry sand fragments.
  • Multi-shear localizations, not interface instability, dominate the onset of instability in expanding sand shells.

Conclusions:

  • The study challenges conventional wisdom regarding the explosive behavior of wet sand.
  • Interstitial oil's lubrication effect and reduced shock compaction decrease viscous resistance in wet sand.
  • The proposed kinetic instability model provides a framework for predicting sand shell fragmentation.