Predicting method of large-size NEPE propellant loading storage life

Abstract

The invention discloses a predicting method of large-size NEPE propellant loading storage life, which includes following steps: (1) performing constant-stress load single-temperature acceleration test, which includes operations of making an NEPE propellant acceleration aging test sample under constant-stress load and performing a single-temperature-stress level temperature acceleration life test; (2) researching the performance change law during an NEPE propellant loading aging process; (3) determining a failure model of the NEPE propellant loading; and (4) carrying out acceleration life tests at different temperatures and under different pressures to predict the large-size NEPE propellant loading storage life. In the method, by means of loading pressure to simulate the self weight on a large-size NEPE propellant during storage, the performance change law of the NEPE propellant under a temperature-pressure double-stress effect. In addition, with tensile strength as a failure parameter, the method of evaluating the NEPE propellant loading storage life is disclosed.

Description

technical field [0001] The invention belongs to the technical field of propellants and explosives, and mainly relates to a method for estimating the storage life of a large-scale NEPE propellant charge, in particular to an accelerated life test method using different temperature stress levels under constant loading stress conditions, and using tensile strength as a failure parameter Assess the shelf life of NEPE propellants. Background technique [0002] Nitrate plasticized polyether propellant (NEPE propellant) is a new generation of solid propellant developed in the United States in the late 1970s and early 1980s. This propellant combines the advantages of double-base propellants and composite propellants. The advantage is that it is a new type of propellant with excellent energy performance and mechanical performance, which represents the development direction of high-energy solid propellant. NEPE propellant, as a kind of composite material with high polymer binder as el...

AI Technical Summary

Problems solved by technology

At present, most of the NEPE propellants used in strategic missiles are large-sized charges, with a diameter of up to 1.4m and a weight of more than 1×10 3 kg, the charge located at the bottom is under great pressure. This self-weight load will lead to the decline of the mechanical properties of the charge and the rupture of the charge column. At the same time, the gas generated by the decomposition is not easy to escape, and the self-catalytic decomposition is intensified, which seriously affects the propulsion of large-scale NEPE. The safe use and storage life of the agent

At the same time, the stabilizer content of double-base propellants is reduced to 50% as the end of safe storage life, and the composite propellant takes mechanical failure as the key parameter. Accelerated life test methods have been established respectively, while the accelerated life test methods of NEPE propellants At present, only the life prediction research of single temperature stress has been carried out, and the influence of the induced pressure generated by self-weight on the storage life of NEPE propellants has not been considered.

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