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Collapse of elongated voids in porous energetic materials: Effects of void orientation and aspect ratio on initiation

Nirmal Kumar Rai1, Martin J. Schmidt2, and H. S. Udaykumar1

  • 1Department of Mechanical and Industrial Engineering, University of Iowa, Iowa City, Iowa 52242, USA
  • 2AFRL-RW, Eglin Air Force Base, Florida 32542, USA

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Phys. Rev. Fluids 2, 043201 – Published 28 April, 2017

DOI: https://doi.org/10.1103/PhysRevFluids.2.043201

Abstract

The sensitivity of porous energetic materials depends on mesostructural heterogeneities such as voids, defects, cracks, and grain boundaries. The mesostructure of pressed explosives contains voids of arbitrary shapes including elongated voids of various orientations and aspect ratios. Mesoscale simulations to date have analyzed the effect of void morphology on the sensitivity of energetic materials for idealized shapes such as cylindrical, conical, and elliptical. This work analyzes the sensitivity behavior of elongated voids in an HMX matrix subject to shock loading. Simulations show that sensitivity of elongated voids depends strongly on orientation as well as aspect ratio. Ranges of orientations and aspects ratios are identified that enhance or inhibit initiation. Insights obtained from single elongated void analyses are used to identify sensitive locations in an imaged mesostructure of a pressed explosive sample.

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See Also

High-resolution simulations of cylindrical void collapse in energetic materials: Effect of primary and secondary collapse on initiation thresholds

Nirmal Kumar Rai, Martin J. Schmidt, and H. S. Udaykumar
Phys. Rev. Fluids 2, 043202 (2017)

Article Text

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Phys. Rev. Fluids 2, 043201– Published 28 April, 2017
  • Received 2 December 2016
Article part of CHORUS

©2017 American Physical Society

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