A method for predicting the storage life of nepe propellants under self-weight-induced pressure

Abstract

The invention discloses a method for predicting storage life of a NEPE (nitrate ester plasticized polyether) propellant based on a deadweight induced pressure condition. The method for predicting the charged storage lie of the NEPE propellant, disclosed by the invention, comprises the following steps: step 1) developing an acceleration test at different temperatures under a constant stress load, including the manufacturing of an accelerated aging test piece of the NEPE propellant under a constant pressure load and the development of an accelerated life test with single temperature which needs to be horizontal temperature; step 2) researching the law of changes in performance of the NEPE propellant in a charged aging process; step 3) determining a failure mode of charging of the NEPE propellant; and step 4) predicting the charged storage life of the NEPE propellant. The method provides a pocess for performing thermal accelerated aging by loading constant stress to simulate a deadweight load so as to simulate the deadweight born by the large-size NEPE propellant during storage; and furthermore, tensile strength is adopted as a failure parameter for simulating the thermal accelerated aging of the NEPE propellant under the action of the deadweight load so as to predict the storage life of the propellant.

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 NEPE propellant charges under self-weight-induced pressure conditions, in particular to a NEPE propellant bearing a certain self-weight pressure. After accelerated tests at different temperatures, the tensile strength Shelf life of NEPE propellants was assessed as a failure parameter. 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 hig...

AI Technical Summary

Problems solved by technology

At present, NEPE propellants with a weight of several hundred kilograms are mostly large-sized charges, and the charges at the bottom are under great pressure. Self-catalytic gas is not easy to escape, which seriously affects the safe use and storage life of large-scale NEPE propellants

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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