Effect of Components on Combustion and Mechanical Properties of HTPB Propellant with High Energy

The combustion properties and mechanical properties of HTPB propellant with 90% solid mass fraction were studied by changing the content and particle size of oxidizer AP,bonding agent and the value of R.The results show that the energy of HTPB propellant increases with the increase of the solid content,and the combustion properties and mechanical properties also keep in a good state.Under the condition of high solid mass fraction,the combustion and mechanical properties of HTPB propellant display some distinct rules as the change of the directions for producing chemicals.The propellants combust steadily and the burning rate and pressure exponent can be controlled.Its burning rate-pressure exponent is between 0.30 and 0.40.The mechanical properties are tested at three different temperatures: 60℃,25℃ and-40℃,revealing that the maximum tensile strength of the propellant at the three temperatures is larger than 1.0 MPa and the maximum elongation of HTPB propellant at-40℃ can reach 74.7%.