Propellant vertical storage and turnover performance evaluation method

Abstract

The invention discloses a propellant vertical storage and turnover performance evaluation method, which comprises the following steps of: obtaining a relaxation modulus main curve and a time-temperature translation factor of a propellant to be evaluated through a stress-strain curve so as to obtain a propellant related failure criterion; obtaining a propellant relaxation modulus main curve according to the stress-strain curve, and establishing a viscoelastic constitutive equation for describing the mechanical properties of the propellant to be evaluated; performing numerical simulation calculation according to the propellant charging structure and the constitutive equation, and evaluating the creep and tensile response characteristics of the propellant to be evaluated in combination with the numerical calculation result and the failure criterion; according to the result, the limit and the optimal overturning time of propellant vertical storage under the current grain structure are obtained, and the related safety coefficient is calculated according to the limit and the optimal overturning time; on the basis, grain structure parameters are adjusted, standing storage time ranges under different parameters are repeatedly obtained, the improvement direction of the charging structure is defined, and then the research and development efficiency of the propellant charging structure meeting the standing storage requirement is improved.

Description

technical field [0001] The invention relates to the technical field of solid propellants, in particular to a method for evaluating the vertical storage and inversion performance of propellants. Background technique [0002] In recent years, with the gradual development of solid rocket motor storage technology, users have stricter requirements on the turnover interval in long-term storage of the engine; at the same time, with the increase in the manufacturing process level of the solid rocket motor combustion chamber, the requirements for the evaluation of grain performance of new engines are also increasing. growing. Therefore, in order to meet the needs of users, cooperate with the development of new processes and technologies, improve the life and working reliability of solid rocket motors, and improve the adaptability of engine grains to long-term storage, it is necessary to study the mechanics of solid rocket motor combustion chambers under storage and overturn condition...

AI Technical Summary

Problems solved by technology

These loads generate stress inside the solid rocket motor charge, leading to changes in its physical and chemical properties and ballistic performance, thereby affecting the reliability of the solid rocket motor, and even causing damage to the solid rocket motor during storage, transportation and use.

Based on the existing literature reports, the current research on the vertical storage and overturning performance of propellants is limited to the study of a single working condition or a specific storage scheme, and there is no systematic study on the mechanical response of solid engine propellant grains under vertical storage and overturning states.

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