Use of a Compressed Gas Gun to Investigate Response of Explosives to a Range of Initiation Stimuli

• Autorzy: Cartwright M. , Lewis A.
• Języki publikacji: EN

Abstrakty

EN

Low velocity impacts are a source of explosive accidents. Several different mechanisms may be concurrently responsible for the initiation. Studying the effects of low velocity, comparatively long duration, impacts on energetic materials can assist in the development of explosive safety procedures and Insensitive Munitions. Careful design of the target configuration can eliminate some of the problems associated with the original Steven tests and enable the various mechanisms such as friction, shear and pinch to be isolated from other factors. In the new configuration the impact is delivered to the explosive by a spigot driven into the target by collision from a gun launched sabot. The spigot geometry i.e. flat or hemi-spherically nosed was varied as was the surface roughness and diameter of the spigot. The rate of energy delivery was varied, by varying the mass of the sabot and its velocity. The gun, 50 mm diameter, operated in the normal atmosphere conditions, NAG. Results show that pinch may be the most critical stimulus but also that friction is more significant than shear. Examination of the target debris following an event indicated that for some materials the limited confinement arising during the firing may result in a burn to detonation condition whereas for other materials the confinement was insufficient for the DDT to occur. Further work on the sample perfection and homogeneity are planned.

Słowa kluczowe

EN

accidents; impact; initiation; explosives; energy; output

• Czasopismo: Central European Journal of Energetic Materials
• Rocznik: 2007
• Tom: Vol. 4, nr 4
• Strony: 33--43
• Opis fizyczny: Bibliogr. 8 poz.

Twórcy

autor

Cartwright M.

autor

Lewis A.

• Department of Environmental and Ordnance Systems, Cranfield University at Defence Academy of the U.K. Shrivenham, Oxfordshire, U.K., SN6 8LA,

Bibliografia

• [1] Lt. Col. T B Rapple HQ Land Command, Wilton, private communication.
• [2] Bowden F.P., Yoffe A.D., Initiation and Growth of Explosions in Liquids and Solids, Cambridge University Press 1952.
• [3] Encyclopaedia of Explosives and related Items 8, 102, 1978, R and D Command, US Army.
• [4] JSP333, Services Text book of Explosives, ch. 15, 2nd edition, HMSO(U.K.) 1989.
• [5] Cooper P.W. & Kurowski S.R., ch. 4, Introduction to the technology of explosives, Wiley VCH 1996.
• [6] Chidester S.K., Green L.G, Lee C.G., A frictional work predictive model for the Initiation of Solid High explosives from Low Pressure Impacts, Proc. 10th Int. Det. Symposium, Boston, Massachusetts, July 12-16, 1993.
• [7] Alec Milne private communication.
• [8] Lee P.R., Critical Power Density: A Universal Quantitative Initiation Criteria, Proc. 10 Int. Symp. on Ballistics, Peking 1987.