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

[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

[发布机构] 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