PREDICTION OF DETONATION HAZARD IN SOLID PROPELLANTS.
Abstract
Experimental demonstrated that when a large mass of an explosive or propellant is burned in a closed system, a sharp change in slope of the burning rate/pressure curve occurs at a pressure which is specific for that material. From the transition pressure and the slope of the transition curve and from the physical configuration of a missile motor, the hazard of detonation may be determined. To extend the range of measurements possible, a pressure vessel has been developed in which measurements of propellant burning rate at pressures as high as 250,000 psi can be made. This vessel has a unique design consisting of two concentric cylinders. Radial stresses are taken by the inner cylinder, which is replaceable if fracture should occur. Recording of pressure information precedes fracture of the inner vessel. The outer cylinder carriers only axial stresses and is of sufficient strength to prevent fracture and retain fragments. The development of this vessel also made possible the examination of burning characteristics of cannon propellants for very high pressure applications. Results show that some standard cannon propellants have transition characteristics similar to those described for explosives and rocket propellants. This phenomenon explains some disastrous incidents resulting from very high pressure gun firings.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1963
- Accession Number
- AD0657605
Entities
People
- Stanley Wachtell
Organizations
- Picatinny Arsenal