Propellant charge cannon shooting overload resistance test and evaluating method

Abstract

The invention discloses a propellant charge cannon shooting overload resistance test and evaluating method, relates to a solid rocket propellant charge cannon shooting overload resistance quality evaluation method, and belongs to the field of solid propellant charge. According to the implementation method, buy building the corresponding relation between three key parameters (the before-turning curve slope, the turning point and the after-turning curve slope of a stress strain rate logarithmic curve) which affect the propellant mechanical properties, and the propellant charge overload resistance, the corresponding relation between the charge length-diameter ratio and the overload resistance based on mechanical failure, and the corresponding relation between the charge wall surface gap and the overload resistance based on thermal failure, the propellant charge cannon shooting overload resistance can be evaluated according to the corresponding relations, the improvement direction of the mechanical property parameters of the propellant is determined according to the evaluation result, and the improvement direction of the propellant charge structure parameters is determined; and accordingly, the research and development efficiency of the cannon shooting overload preventing propellant charge meeting the project requirements is improved, and the problems of related projects in the overload preventing propellant charge field are solved.

Description

technical field [0001] The invention relates to a method for evaluating the quality of a solid rocket propellant charge against gun shooting, in particular to a method for testing and evaluating the solid propellant charge against gun shooting overload conditions, and belongs to the field of solid propellant charge. Background technique [0002] The solid propellant charge bears an axial overload of tens of thousands of g in the shooting environment, which has a great impact on the structure of the engine charge, and is likely to cause severe phenomena such as damage to the structural integrity of the charge. At the same time, under the condition of gunshot overload, the charge undergoes large deformation and vibration, and the friction between the charge and the engine casing may cause the formation of hot spots, which in turn leads to the dangerous situation of accidental ignition. The anti-overload quality evaluation of propellant charges can obtain the material propertie...

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Problems solved by technology

[0003] Under the condition of gunshot overload, the propellant charge has a wide strain rate mechanical response. The traditional method based on the quasi-static propellant performance and failure criteria to evaluate the anti-overload of the charge has low reliability, and there is a lack of quantitative methods for thermal safety. Failure criterion

At the same time, the key parameters that affect the mechanical properties of the propellant are not clear, and the structural parameters that affect the anti-overload ability of the charge are not clear, resulting in the blindness of the anti-overload design of the mechanical properties of the propellant and the anti-overload safety design of the charge structure, which increases the product quality. Effort and cost in R&D

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