功能梯度材料层合圆柱壳屈曲行为及抗屈曲优化设计研究

Functionally graded materials (FGM) and laminated composite materials have the widespread applications in aerospace engineering, shipping industry, electronic industry, nuclear facilities, etc. These kinds of materials, which have exhibited excellent performances, are usually used individually in practice. In this project, to complement each other with their own advantages, new materials should be presented firstly and the constructed structures can serve in more extreme environment. Therefore, the related researches should have a broad application prospect and more realistic significance. In the study, buckling behaviors, anti-buckling design and structural optimization of an FGM laminated cylindrical shell are investigated under the combined mechanical and thermal loads. By employing the analytical method, numerical simulations and optimization method, a series of problems, including critical buckling loads, post-buckling behaviors and imperfection sensitivity, are resolved in the analysis. Meanwhile, based on the influence caused by the non-uniform thickness and distributed gradient of FGM layer, a feasible anti-buckling design is obtained by optimizing the constituent distribution and geometric control parameters. With the implementation of the project, an interesting anti-buckling function for the FGM structures should be developed. The research findings should promote the progress of the materials science and establish the theoretical basis for the application of this materials structure.

功能梯度材料和层合复合材料已在宇航、船舶、电子和核能等工业领域广泛应用。这两种材料通常均单独使用并发挥各自不同的优良性能。本项目将它们优势互补地有机结合，构造出对极端环境耐受能力更佳的优化结构。相关研究成果具有广泛的应用前景和重要的现实意义。研究中以一类功能梯度材料层合圆柱壳为对象，采用解析法、数值模拟以及优化设计方法，对其在力、热荷载耦合作用下的屈曲行为、抗屈曲设计及结构优化问题开展深入的研究。建立可解决该类壳体屈曲临界荷载、后屈曲行为和缺陷敏感度问题的分析方法。在此基础上，重点研究功能梯度材料层厚度和材料组份分布梯度的非一致性对壳体屈曲行为的影响，并借助优化设计方法获得抗屈曲性能最佳的材料分布和结构尺寸控制参量，从而提出一种可行的抗屈曲设计构想。本项目的实施将赋予功能梯度材料一种新的抗屈曲功能，推进学科发展，并为该类材料结构的研究和应用提供理论基础和依据。