复合材料结构热压罐固化成型工艺过程的多物理场流固完全耦合求解方法研究

多物理场流固耦合求解是诸多科学与工程领域中的关键科学问题，尤其是当固相为各向异性材料结构时，给数值求解带来了严重挑战。本项目拟以复合材料结构热压罐固化成型工艺过程的数值模拟问题为背景，发展多物理场热流固完全耦合理论框架及数值求解方法。扩展逐层方法是一种典型的准三维板壳理论，非常适合用于精确求解层合板壳类结构在多物理场作用下的层间应力，且易于处理结构与环境之间的热流固问题。首先，建立复合材料板壳结构固化过程的扩展逐层分析理论模型，实现多物理场和层间残余应力的完全耦合求解；然后，建立复合材料板壳工件与模具的整体分析理论模型，解决现有分析方法精确处理界面力-热相互作用方面的瓶颈问题；最后，实现复合材料板壳工件内部多物理场问题与外部热流固问题的无缝耦合，探讨固化过程中各物理量的演化机理，以及损伤和缺陷的萌生与扩展机理。本项目的研究成果对复合材料结构热压罐固化工艺的分析、设计、优化具有重要理论意义。

The coupling analysis of multi-physical fluid-solid is a key scientific problem in many fields of science and engineering, especially the anisotropic phase, it brings a serious challenge to the numerical analysis. This project is focus on the numerical simulation of the autoclave curing process of composite plates and shells; the computational analysis framework and its numerical solving methods will be developed for the coupling solution of multiple-physical fluid-solid problems. The extended layerwise method (XLWM) is a typical quasi three-dimensional plate and shell theory. It is very suitable for accurately solving the interlaminar stress of laminated plates and shells under the multiple-physical loading, and is easy to deal with the heat fluid-solid problems between the structure and the environment. Firstly, a XLWM of curing process is established to analyze the complete coupling solution of multi-physical field and interlaminar residual stress. Secondly, the integral modeling technology of composite structures and mold is established to solve the bottleneck problem of existing analysis methods for the interface force and thermal interaction. Finally, the seamless coupling of the multi-physical field problem and the thermal-fluid-solid problem will be studied, and the evolution mechanism of each physical quantity in the curing process will be discussed, as well as the initiation and growth mechanism of damage and defect. The research results of this project have important theoretical significance for the analysis, design and optimization of the autoclave curing process of the composite structures.