Low strain rate compression measurements of PBX 9501, PBXN-9, and MOCK 9501

摘要

Low strain rate (10 to the -3rd power to 10 to the -1st power L/s) compression measurements have been obtained on three different composite materials: PBX 9501, PBXN-9, and a sugar mock of PBX 9501. These measurements expand on earlier efforts to identify the behavior of PBX 9501 and sugar mocks at different rates, aspect ratios (L/d) and temperatures. PBX 9501 samples at three different L/d's were strained at the same rate to evaluate L/d effects on the stress strain parameters. Extensometer and strain gage data obtained with these measurements were also compared for precision. PBXN-9 data were obtained at two different L/ds, two different temperatures, and at three different rates. The PBXN-9 data exhibit similar trends to other energetic materials data, i.e. 1) increased ultimate compressive strength and modulus of elasticity with either an increase in strain rate, or decrease in temperature, and 2) small changes in the strain at maximum stress with changes in temperature or strain rate. A comparison of the PBXN-9 data to the PBX 9501 data shows that both begin to fail at comparable strains, however the PBXN- 9 data is considerably weaker in terms of the ultimate compressive strength.