@article{Wang2026, 
author = {Yue Wang and Zhixiang Wang and Daokui Li},
title = {Post-buckling optimization design of curved fiber composite cylindrical shell under bending moment},
year = {2026},
journal = {Journal of National University of Defense Technology},
volume = {48},
number = {5},
pages = {239-250},
keywords = {curved fibre, composite cylindrical shell, sensitivity analysis, post-buckling analysis, optimal design},
url = {https://www.sciopen.com/article/10.11887/j.issn.1001-2486.24070022},
doi = {10.11887/j.issn.1001-2486.24070022},
abstract = {ObjectiveThere is an urgent need for lightweight design of advanced aircraft. Composite materials have been widely used in advanced aircraft because of their advantages such as high specific stiffness, high specific strength and strong designability. The design space of curved fiber composites is large, and the design parameters are numerous, which increases the complexity of the optimization process. How to efficiently and accurately provide a reasonable structural analysis and optimal design scheme of curved fiber composite materials, fully utilize the excellent mechanical properties of curved fiber composite materials, and further improve the role of curved fiber composite materials in structural weight reduction poses a major challenge for the lightweight design of advanced aircraft structures.MethodsFirstly, the linear function was used to characterize the curved fiber path, and the fiber path can be determined by two fiber direction angles. Then, the parametric model of the curved fiber composite cylindrical shell structure was established based on Python language. An explicit nonlinear dynamic algorithm was used to analyze the post-buckling characteristics of composite cylindrical shells under bending moments. The optimal design parameters of curved fiber composite cylindrical shells were determined by using the sequential approximate optimization method, which considered the combination of radial basis function surrogate model and global/local optimization algorithm. Finally, the optimized structure was compared with that of the constant-stiffness cylindrical shell, and the results verified the effectiveness of the proposed method.ResultsIn this paper, with the background of structural optimization design of curved fiber composite, the post-buckling characteristics of curved fiber composite cylindrical shell structures are studied, and the post-buckling optimization design of curved fiber composite cylindrical shell based on sequential approximate optimization method is developed. The results of sensitivity analysis show that the design variables of the inner and outer layers of curved fiber composite cylindrical shells have a large influence on the buckling load. By optimizing the direction angle of each layer of fiber, the post-buckling load is maximized, and the feasible optimal solution of the curved fiber composite structure is obtained. Compared with the optimal structure of the constant-stiffness composite cylindrical shell, the load-bearing capacity of the structure was improved by 37.58%. It provides reference for lightweight design of advanced aircraft structures.ConclusionsBased on the research background of structural optimization design of curved fiber composites, the post-buckling optimization design of cylindrical shells of curved fiber composites is developed. A feasible structural design scheme of curved fiber composite cylindrical shells was obtained by using the sequential approximate optimization method. Compared with the optimal structure of constant-stiffness composite cylindrical shells, the load-bearing performance of the structure could be improved by 37.58%. When the linear function is used to characterize the fiber path, the fiber direction angle on the tension side should be smaller than that on the compression side, so that the stress distribution can be reasonably regulated, the compression range of the structure can be increased, and the post-buckling load of the structure can be increased. Based on the work in this paper, further optimization design of curved fiber composite reinforced cylindrical shells can be carried out to provide reference for the lightweight design of advanced aircraft structures.}
}