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This study reveals that nanoscale shear bands in explosives accelerate reactions without significant heating. This "chemical activation through shear banding" offers a new perspective on high explosive initiation and detonation.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Computational Chemistry

Background:

  • High explosives initiation and detonation are traditionally linked to "hot spots" that locally elevate temperature, accelerating chemical reactions.
  • Understanding the mechanisms behind these hot spots is crucial for predicting and controlling explosive behavior.

Purpose of the Study:

  • To investigate the role of nanoscale shear bands in the shock initiation of 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) high explosive crystals.
  • To determine if shear bands can facilitate chemical reactions independently of localized high temperatures.

Main Methods:

  • Utilized classical molecular dynamics to simulate the formation of shear bands in shocked TATB crystals.
  • Employed quantum-based molecular dynamics for scale bridging to analyze reaction barriers within these shear bands.

Main Results:

  • Predicted the formation of nanoscale shear bands through plastic failure in shocked TATB.
  • Demonstrated that these shear bands exhibit lower chemical reaction barriers.
  • Observed that shear bands remain chemically activated and support increased reaction rates even after cooling, challenging the conventional hot spot paradigm.

Conclusions:

  • Shear bands in high explosives can lead to "chemical activation" by lowering reaction barriers, independent of thermal effects.
  • This phenomenon provides a new mechanism for understanding shock initiation and detonation in energetic materials.
  • The findings suggest that controlling shear band formation could be a novel approach to tailoring explosive performance.