Studies on the Dynamic Mechanical Properties of the Composite Modified Double-Base Propellant

摘要

The dynamic mechanical properties of the composite modified double-base (CMDB), double-base (DB) and polyvinyl chloride (PVC) composite propellants were measured respectively with a Rheovibron viscoelastometer. The effects of three kinds of solid fillers (aluminium (Al), ammonium percholate (AP) and cyclotetraethylenetetranitramine (HMX)) and the different kinds and contents of plasticizers (triacetin (TA), ortho-dibutyl phthalate (DBP) and nitroglycerine (NG)) on the dynamic mechanical properties of the double-base binder were studied. The dynamic mechanical data and spectrums on these ingredients have been obtained at a fixed frequency (3Hz) and a broad range of temperature. At the same time, the impact strengths of the CMDB propellant, the double-base binder and the pvc propellant were also measured at a broad range of temperature. Experimental conclusions have been obtained that the dynamical mechanical properties of thd CMDB proepllant lie between the DB and PVC composite propellants and depend on its binder system, and that the CMDB propellant has the specific properties of both higher mechanical damping and a strong Beta relaxation at low temperature. Keywords: Rocket propellants.