Short pulse duration shock initiation experiments plus ignition and growth modeling on Composition B

18th APS-SCCM; 24th AIRAPT

May, Chadd M.^1 ; Tarver, Craig M.^1

Lawrence Livermore National Laboratory, Livermore

CA

94551, United States^1

关键词: Detonation waves;    Failure diameters;    Initiation process;    Reactive flow model;    Secondary explosive;    Shock initiation;    Short pulse duration;    Threshold velocity;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/5/052045/pdf
DOI  :  10.1088/1742-6596/500/5/052045

来源: IOP

【 摘 要 】

Composition B (63% RDX, 36% TNT, 1% wax) is still a widely used energetic material whose shock initiation characteristics are necessary to understand. It is now possible to shock initiate Composition B and other secondary explosives at diameters well below their characteristic failure diameters for unconfined self-sustaining detonation. This is done using very high velocity, very thin, small diameter flyer plates accelerated by electric or laser power sources. Recently experimental detonation versus failure to detonate threshold flyer velocity curves for Composition B using several KaptonTMflyer thicknesses and diameters were measured. Flyer plates with diameters of 2 mm successfully detonated Composition B, which has a nominal failure diameter of 4.3 mm. The shock pressures required for these initiations are greater than the Chapman-Jouguet (C-J) pressure in self-sustaining Composition B detonation waves. The initiation process is two-dimensional, because both rear and side rarefactions can affect the shocked Composition B reaction rates. The Ignition and Growth reactive flow model for Composition B is extended to yield accurate simulations of this new threshold velocity data for various flyer thicknesses.