Computational studies of the skid test: Evaluation of the non-shock ignition of LX-10 using HERMES

18th APS-SCCM; 24th AIRAPT

White, B.W.^1 ; Springer, H.K.^2 ; Reaugh, J.E.^2

Computational Engineering Division, Lawrence Livermore National Laboratory, 7000 East Ave., Livermore

CA

94550, United States^1

Chemical Science Division, Lawrence Livermore National Laboratory, 7000 East Ave., Livermore

CA

94550, United States^2

关键词: Computational studies;    High explosives;    Ignition mechanisms;    Impact angles;    Incident angles;    Mechanical stimulus;    Shear dependences;    Shock ignitions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/19/192021/pdf
DOI  :  10.1088/1742-6596/500/19/192021

来源: IOP

【 摘 要 】

We perform computational studies to evaluate the non-shock ignition response of LX-10 (95wt.% HMX, 5wt.% Viton A) during a skid impact test. We employ the HERMES (High Explosive Response to MEchanical Stimuli) model for LX-10 for Skid test calculations investigating the influence of drop height and angle on the pressure, strain-rate, strain, and ignition states. While grit is typically present in skid tests, it was not considered in these continuum-scale calculations. We found that the incident angle has a much more significant influence on pressure, strain-rate, strain, and ignition states than drop height. The peak HERMES ignition parameter value, Ign, is nearly one order of magnitude higher for an incident angle of 45° than for 14°. Peak Ign values occur at the contact patch where shear deformation is highest and is a result of the shear-dependence in the ignition criteria. While peak Ign values for Steven Tests were approximately 60, the skid test had a much smaller value