Method of determining sampling time in accelerated storage test of NEPE (nitrate ester plasticized polyether) propellant

Abstract

The invention discloses a method of determining sampling time in accelerated storage test of NEPE (nitrate ester plasticized polyether) propellant and aims to solve the problems that sampling is only made by experience for the prior accelerated storage test of the NEPE propellant, the consumption of chemicals is high and test samples are unable to be accurately sampled. The method includes: acquiring dynamic chemical characteristics by means of dynamic mechanical analysis, indirectly recognizing the information about changes in chemical properties of an accelerated storage sample for the NEPE propellant, and determining the sampling time of a tensile strength change sample for the accelerated storage test of the NEPE propellant. The method has the advantages that adding more drugs is never required in the accelerated storage test of the NEPE propellant, the defect that sampling cannot be accurately made in the accelerated storage test is overcome, and the method is suitable for the determination of the sampling time in the accelerated storage test of the NEPE propellant.

Description

technical field [0001] The invention belongs to the technical field of propellants and explosives, and mainly relates to accelerated storage tests of NEPE propellants, in particular to the use of dynamic mechanical analysis technology to obtain dynamic mechanical characteristic quantities, to identify the change information of mechanical properties of samples for accelerated storage of NEPE propellants, and to determine the accelerated storage tests of NEPE propellants Tensile strength change specimen sampling time. technical background [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 is prepared by casting process, which combines double base propellant It is a new type of propellant with excellent energy performance and mechanical performance. NEPE propellant is a composite material based on a polymer, the binder is a prepolymer of a ...

AI Technical Summary

Problems solved by technology

However, in the aging test process, there are mainly the following defects: (1) The sampling time of the aging sample is only judged by experience, if the interval is too short, the performance of the sample does not change significantly; As a result, the aging sample cannot accurately describe the changing law of aging performance; (2) The tensile strength of the static mechanical property test is a destructive test and cannot be measured repeatedly. In order to improve the above-mentioned problem of uneven sampling, it is possible to increase the amount of test samples by an appropriate amount, but Since the propellant is a flammable and explosive substance, the sample size of the accelerated test should be strictly controlled and cannot be exceeded, so it is difficult to solve the above problems by increasing the sample size. In addition, for high-value materials, increasing the sample size also increases the test cost (3) To scientifically determine the sampling time of the NEPE propellant accelerated storage test, it can only be judged by experience, and there is no economical, safe and effective method to monitor the test process

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