Abstract
The propagation of self similar convergent detonation wave in TATB-based explosive composition was studied both experimentally and numerically. The device constists in a 50 mm cylinder of TATB surrounded by an HMX tube. The detonation in HMX overdrives the detonation in TATB which adapts to the propagation velocity with a convergent front at centerline. We measured a curvature of κ = −21.2 m−1 for propagation velocity of 8750 m/s, which extends the knowledge of the (Dn ,κ ) law. A wide ranged EOS/reaction rate model inspired from previous work of Wescott et al. was calibrated to reproduce both the run-to-detonation distance and the newly extended (Dn ,κ ) law for the 1D sligthly curved detonation theory. 2D Direct Numerical Simulations (DNS) were made on fine resolved mesh grid for the experimental configuration and for various driver velocities. The simulation reproduces the experimental data both qualitatively (overall detonation structure) and quantitatively (κ = −25.4 m−1 ).
Highlights
The insensitive high explosives are non ideal explosives: i.e. their detonation velocity is very sensitive to the local curvature of the front
In order to obtain the stationary constant wave with a negative curvature, we propose an experimental configuration where the detonation in a cylindrical sample of TATB explosive is driven by an external tube of HMX
We designed an experimental device in order to obtain data to extend knowledge of (Dn, κ) curve to convergent detonation for TATB-based explosives
Summary
The insensitive high explosives (such as TATB-based compositions) are non ideal explosives: i.e. their detonation velocity is very sensitive to the local curvature of the front. This dependence can be modeled by the Detonation Shock Dynamics usually calibrated on slightly divergent steady detonations being propagated in rods. In order to obtain the stationary constant wave with a negative curvature, we propose an experimental configuration (similar to that used by Souletis and Groux [1]) where the detonation in a cylindrical sample of TATB explosive is driven by an external tube of HMX. As the ideal detonation velocity (known as Chapman-Jouguet DCJ) of HMX is much higher than that of TATB, the detonation is overdriven at constant speed in TATB and adopts a concave shape
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
