High speed observation of fragment impact initiation of nitromethane charges

Cook, M. D.; Haskins, P. J.; Briggs, R. I.; Cheese, P.; Stennett, C.; Fellows, J.
April 2000
AIP Conference Proceedings;2000, Vol. 505 Issue 1, p793
Academic Journal
Ultra high-speed digital photography has been used to record the onset and build-up of reaction in nitromethane charges that have been impacted by steel fragments. The nitromethane charges were housed in PMMA cylinders and back-lit using conventional flash bulbs. Flat plates of aluminium were glued to one end of the cylinder and PMMA plates to the other. The completed charge was positioned to allow normal impact of the projectiles through the aluminium barrier plate. The events were filmed using an Imacon 468, ultra high-speed digital image system, capable of framing at up to 100 million pictures per second. Using this system it was possible to record detailed photographic information concerning the onset and growth of reaction due to shock initiation of the nitromethane charges. The results obtained to date are consistent with the established concepts for initiation of homogenous and heterogeneous materials.


Related Articles

  • The effect of impact angle on the initiation threshold of bare and covered explosives. James, H. R.; Cook, M. D.; Haskins, P. J. // AIP Conference Proceedings;2000, Vol. 505 Issue 1, p907 

    Initiation thresholds generated by oblique impacts of rods and spheres are examined, and their relationship to normal impacts of cones are explored. Experimental data from rod impacts show two distinct response regions for bare or lightly covered charges, the division between them depending on...

  • Single and multiple impact ignition of new and aged high explosives in the Steven Impact Test. Chidester, S. K.; Tarver, C. M.; DePiero, A. H.; Garza, R. G. // AIP Conference Proceedings;2000, Vol. 505 Issue 1, p663 

    Threshold impact velocities for ignition of exothermic reaction were determined for several new and aged HMX-based solid high explosives using three types of projectiles in the Steven Test. Multiple impact threshold velocities were found to be approximately 10% lower in damaged charges that did...

  • Impact Interaction of Projectile with Conducting Wall at the Presence of Electric Current. Chemerys, Volodymyr T.; Raychenko, Aleksandr I.; Karpinos, Boris S. // AIP Conference Proceedings;2002, Vol. 620 Issue 1, p1314 

    The paper introduces with schemes of possible electromagnetic armor augmentation. The interaction of projectile with a main wall of target after penetration across the pre-defense layer is of interest here. The same problem is of interest for the current-carrying elements of electric guns. The...

  • Microstructural effects in PBX 9501 damaged by shear impact. Skidmore, C. B.; Phillips, D. S.; Asay, B. W.; Idar, D. J.; Howe, P. M.; Bolme, D. S. // AIP Conference Proceedings;2000, Vol. 505 Issue 1, p659 

    Various microstructural mechanisms have been suggested for ignition in explosives subjected to impact by low-velocity projectiles. In this study, the effects of shear on the microstructure of PBX 9501 are described. The pseudo two-dimensional, shear-impact experiment, previously employed by...

  • Three-dimensional displacement measurements ahead of a projectile. Goldrein, H. T.; Synnergren, P.; Proud, W. G. // AIP Conference Proceedings;2000, Vol. 505 Issue 1, p1095 

    A new method has been developed for determining all three components of displacement at every point on a plane within a specimen deforming in an impact. By repeating the experiment, both the location of the plane and the time of the measurement can be varied, thus making it possible to visualise...

  • Effect of Shock Precompression on the Critical Diameter of Liquid Explosives. Petel, Oren E.; Higgins, Andrew J.; Yoshinaka, Akio C.; Fan Zhang // AIP Conference Proceedings;2006, Vol. 845 Issue 1, p998 

    The critical diameter of both ambient and shock-precompressed liquid nitromethane confined in PVC tubing are measured experimentally. The experiment was conducted for both amine sensitized and neat NM. In the precompression experiments, the explosive is compressed by a strong shock wave...

  • Effects of different nose-shaped projectiles on the high speed perforation of concrete. Kumaran, S. Uthaya; Lim, C. T.; Ong, K. C. G.; Tan, G. E. B. // AIP Conference Proceedings;2000, Vol. 505 Issue 1, p1233 

    This paper examines the effects of different nose-shaped projectiles on the perforation of concrete at high speeds [1]. The severity of damage is assessed in terms of the crater size on the impact and distal faces. An attempt is made to correlate the severity and type of damage with factors such...

  • Shock Wave Initiation of Mixture Liquid Explosives. Fedorov, A. V.; Mikhailov, A. L.; Nazarov, D. V.; Finyushin, S. A.; Men'shikh, A. V.; Davydov, V. A. // AIP Conference Proceedings;2006, Vol. 845 Issue 1, p960 

    We investigated initiation of liquid HE consisting of tetranitromethane (TNM) and nitrobenzene (NB). Smooth stable (when mass of NB<20%) and pulsing unstable detonation wave front was registered (20–50% NB). We registered shock wave, shock compressed explosive (SCE) detonation wave and...

  • Shock and release behavior of filled and unfilled epoxies. Anderson, M. U.; Setchell, R. E.; Cox, D. E. // AIP Conference Proceedings;2000, Vol. 505 Issue 1, p551 

    The shock and release behavior of both alumina-filled and unfilled epoxies are examined in planar impact experiments. The various materials investigated can be used as encapsulants in applications such as shock-activated pulsed power supplies. Characterizing their dynamic behavior under shock...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics