Interactive coupling numerical simulation method of temperature field in autoclave forming of composite materials

Abstract

An interactive coupling numerical simulation method for a molding temperature field of a composite autoclave comprises the following steps: building a heat flow calculation model to obtain a flow field and a fluid temperature field; building a curing molding calculation model to obtain a solid temperature field formed by a composite member and a molding die; performing temperature interaction based on iterative calculation of the heat flow calculation model and iterative calculation of the curing molding calculation model to realize temperature coupling between a fluid and a solid. According to the interactive coupling numerical simulation method, impacts on an airflow field from a die temperature field and a member temperature field are taken into consideration, iterative-step-based bidirectional coupling analysis is adopted, data interaction between the solid temperature field and the airflow field is arranged in each iterative step, and the strong coupling function between the solid temperature field and the airflow field is drawn into consideration, so that the problem of deviation of the temperature field in the background art is effectively solved, the reliability of simulated results is improved, the simulation better conforms to the reality, and a foundation is laid for follow-up stress and strain analysis.

Description

technical field [0001] The invention relates to the technical field of composite material forming numerical simulation, in particular to an interactive coupling numerical simulation method for composite material autoclave forming temperature field. Background technique [0002] Composite materials have been widely used in high-tech fields such as aerospace due to their excellent characteristics such as high specific strength and specific stiffness, strong designability, and ease of overall molding of large-area complex parts. Due to the relatively uniform temperature field and pressure field in the tank, the low porosity of the molded parts, and the stable mechanical properties of the autoclave forming process, it has become the main forming process for composite load-bearing components used in aerospace fields such as large aircraft. [0003] The specific process of autoclave forming of composite material components is roughly as follows: the composite material prepreg is l...

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Problems solved by technology

[0004] In the prior art, there are already many numerical modeling methods for the temperature field of the autoclave forming process of composite material components, but most of the existing numerical simulation analyzes analyze the temperature field of the composite material component and the fluid temperature field separately, namely The influence between the fluid temperature field and the component temperature field is unidirectional. Only the influence of the fluid temperature field on the component temperature field is considered. When analyzing the fluid temperature field, the influence of the heat released by the curing reaction of the composite material on the fluid temperature field is not considered. Therefore, the deviation between the temperature field obtained by the existing numerical simulation method and the actual temperature field of the component is relatively large, and the reliability of the result is not high, especially for large-scale load-bearing components, this deviation will further increase

[0005] Chinese patent 201110451986.0 discloses a design method for autoclave forming tooling of composite components based on finite element analysis. Although this solution proposes to establish the airflow field-temperature field coupling relationship during the solidification deformation analysis of components, the airflow The field-temperature field coupling relationship is only one-way, which only considers the influence of the airflow field on the temperature field of the mold and the component temperature field, but does not consider the influence of the temperature field of the mold and the component temperature field on the airflow field

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