Sandwich-walled cylindrical shell has been built with lattice-like stiffeners by adding another layer of skin in the inner surface of shell. Taking advantage of high mechanical property of lattice-like stiffeners, such as high specific stiffness, high specific strength etc., sandwich-walled cylindrical shell is studied for high load-carrying capacity in this paper. In this study, major parameters of sandwich-walled cylindrical shell is discussed for the effect of load-carrying capacity, and the imperfection sensitivity analysis of sandwich-walled cylindrical shells is carried out based on the eigenmode-shape imperfection approach and the single perturbation load approach. Comparing with the traditional stiffened cylindrical shell, the sandwich-walled cylindrical shell has a higher load-carrying efficiency. The reason of phenomenon is high bending stiffness of lattice-like stiffeners. And then, the optimization design of sandwich-walled cylindrical shells is carried out. It is results that optimum design of sandwich-walled cylindrical shell improved knockdown factor and load-carrying capacity. It can be concluded that sandwich-walled cylindrical shell is a potential structure to be more efficient structure in the future aerospace and aircraft designs.
国家重点基础研究发展计划(2014CB049000)
国家自然科学基金(11372062)
中国博士后基金特别项目(2015T80246)
感谢大连理工大学的周演和周才华对本文的支持和建议.
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Figure 1
Discrete lattice cells.
Figure 2
Geometric parameters of sandwich-walled cylindrical shell.
Figure 3
(Color online) FEM of sandwich-walled cylindrical shell.
Figure 4
(Color online) Load versus end-shortening curves of models 1–3.
Figure 5
(Color online) Displacement distributions of models 1–3.
Figure 6
(Color online) Effect of parameter
Figure 7
(Color online) Effect of parameter
Figure 8
(Color online) Stiffened cylindrical shells. (a) Triangle-grid stiffened cylindrical shell 1; (b) triangle-grid stiffened cylindrical shell 2; (c) isogrid stiffened cylindrical shell; (d) skin-stringer cylindrical shell; (e) hierarchical stiffened cylindrical shell.
Figure 9
(Color online) Comparison of load-carrying capacity of stiffened cylindrical shells without imperfection.
Figure 10
(Color online) Comparison of load-carrying capacity of stiffened cylindrical shells with eigen-mode imperfection.
Figure 11
(Color online) Comparison of load-carrying capacity of stiffened cylindrical shells with single dimple imperfection.
Figure 12
(Color online) Critical unstable modes of stiffened cylindrical shell and sandwich-walled cylindrical shell.
模型1 | 模型2 | 模型3 | |
参数 | |||
质量 (kg) | 718 | 736 | 739 |
极限承载力 (kN) | 2780 | 6182 | 5598 |
变量 | 下限 | 初始值 | 上限 |
2.5 | 4 | 5.5 | |
6 | 9 | 12.0 | |
15 | 19 | 23 | |
20 | 30 | 40 | |
60 | 90 | 120 |
完美模型极限承载力(kN) | 基于单点凹陷极限承载力(kN) | 折减因子 | |
双层蒙皮加筋柱壳结构最优设计 | 75000 | 72400 | 0.965 |
网格加筋柱壳结构最优设计 | 34333 | 26246 | 0.764 |
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