Dynamic and Quasi Static Mechanical Properties of Comp B and TNT.
ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL NJ ARMAMENT ENGINEERING DIRECTORATE
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Studies have been made of the mechanical properties of Composition B and TNT cast from the melt. Measurements were made in uniaxial compression and triaxial compression Uniaxial strain as a function of temperature and strain rate. The mechanical properties have been investigated at low quasi static strength rates and at dynamic failure in 2 to 10 milliseconds strain rates to simulate gun launch conditions. The quasi static results will be used to model conditions as the material is cooled from the melt and the dynamic results will be available to model the response to gun launch conditions. Two variations of Composition B were also studied in which the TNT purity, the RDX particle size, and the wax content were varied. The results indicate that Comp B is stronger and stiffer than TNT for all conditions of measurements used. In addition, the yield strength under the confined condition of the triaxial test is larger than the uniaxial compressive strength as expected for brittle materials. Both the yield strength and the compressive strength decrease with increasing temperature and decreasing strain rate. The results are discussed in terms of known mechanisms of mechanical failure.
- Ammunition and Explosives