Effects of different types of defects on ignition mechanisms in shocked β-cyclotetramethylene tetranitramine crystals : A molecular dynamics study based on ReaxFF-lg force field

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

1 Scopus Citations
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Author(s)

  • Zhiqiang Qiao
  • Xiaogan Dai
  • Ming Li
  • Gang Pei
  • Yushi Wen

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number195101
Journal / PublicationJournal of Applied Physics
Volume125
Issue number19
Online published17 May 2019
Publication statusPublished - 21 May 2019

Abstract

Microscopic defects affect shock sensitivity remarkably. We exhibit a molecular dynamics study of defective β-cyclotetramethylene tetranitramine (HMX) crystals with void (VH), entrained oxygen (OH), and entrained amorphous carbon (CH), as well as a perfect HMX crystal (PH) for contrast. The crystals were shocked with 9 km/s shock velocity perpendicular to the (010) plane for 50 ps using a ReaxFF-lg force field. The results demonstrate that the shock sensitivity of HMX crystals with different defects is enhanced to different degrees. OH has the highest shock sensitivity, which is slightly higher than that in VH; both OH and VH crystals have much higher shock sensitivity than that in CH. Obvious local high temperature areas are found in defective systems, which are not found in PH. The initial reaction is N-NO2 bond cleavage in PH and is N-NO2 and N-O bond cleavages in defective systems. More products are found in defective HMX crystals during shock simulations, while fewer immediate products and no final product are found in PH. The average temperature, pressure, and decrement of potential energy during simulation are much higher in defective systems compared to the perfect ones.

Citation Format(s)

Effects of different types of defects on ignition mechanisms in shocked β-cyclotetramethylene tetranitramine crystals : A molecular dynamics study based on ReaxFF-lg force field. / Huang, Xiaona; Qiao, Zhiqiang; Dai, Xiaogan; Zhang, Kaili; Li, Ming; Pei, Gang; Wen, Yushi.

In: Journal of Applied Physics, Vol. 125, No. 19, 195101, 21.05.2019.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review