Research on NEPE Propellant at High Strain Rates

Abstract In order to study the mechanical properties of Nitrate Ester Plasticized Polyether (NEPE) propellant at high strain rates, impact tests NEPE were carried out by split Hopkinson bar, and stress-strain curves under different rates ( 1500s −1 -4500s ) obtained. The test results show that has obvious nonlinear elasticity rate sensitivity. microstructure was observed scanning electron microscope, fracture mechanism obtained analyzing propellant. this paper, a visco-hyperelastic constitutive model is adopted, in which Rivlin viscoelastic are used describe materials. parameters material fitting data, it proved could well comparing curve rates.