Component-based CMDB propellant mechanical prediction method

Abstract

The invention discloses a component-based CMDB propellant mechanical prediction method, relates to a mechanical property prediction method at a wide strain rate, is applicable to the field of CMDB propellant formula mechanical optimization design, and belongs to the field of solid propellant rate dependence mechanical properties. The implementation method comprises the following steps that according to atomic group contribution and selection principle, input parameters obtaining components are selected, a potential-energy function of an adhesive matrix is built, and by quantizing storage modulus and Young modulus, the glass-transition temperature and the Young modulus of the adhesive matrix of a CMDB propellant are calculated. Considering the solid particle strengthening effect, the Youngmodulus of the CMDB propellant is calculated; a rate dependence constitutive model is built through integration; the rate dependence constitutive model can be applied to application fields related tothe CMDB propellant, prediction of the relation between the CMDB propellant molecular structure and the mechanical property is achieved, and engineering problems in the application fields related to the CMDB propellant are solved.

Description

technical field [0001] The invention relates to a component-based CMDB propellant mechanical prediction method, in particular to a mechanical performance prediction method under a wide strain rate, which is applicable to the field of mechanical optimization design of CMDB propellant formula and belongs to the field of solid propellant rate-dependent mechanical properties . Background technique [0002] A solid propellant is a nonlinear viscoelastic material. At present, there are multiple integral nonlinear constitutive models and single integral nonlinear constitutive models to describe the nonlinear mechanical behavior of materials. Compared with the multi-integral nonlinear constitutive model, the single-integral nonlinear constitutive model is simple in form and has fewer parameters, which is convenient for secondary development of finite element software and has been widely used in engineering. Common single-integral nonlinear constitutive models include Leaderman con...

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Problems solved by technology

[0003] To sum up, there are currently many studies on the macroscopic laws of its mechanical properties, and most of the established mechanical models are macroscopic empirical models. The prediction results of these models are in good agreement with the experimental results, but the acquisition of model parameters is highly dependent on Experimental data, and the research on revealing the nature of regular changes, the influence of component composition on stress-strain curve and stress-strain energy, component microstructure and the correlation between adhesive matrix network structure and mechanical properties is not systematic enough. And in-depth, lack of theoretical models at the micro level, there is still a big gap between the prediction of the model and the actual demand

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