Issue |
JNWPU
Volume 36, Number 5, October 2018
|
|
---|---|---|
Page(s) | 839 - 847 | |
DOI | https://doi.org/10.1051/jnwpu/20183650839 | |
Published online | 17 December 2018 |
Stability of Filament-Wound Composite Cylinders Subjected to Hydrostatic Pressure
静水压力下纤维缠绕圆柱壳体的稳定性分析
1
School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an
710072, China
2
Key Laboratory for Unmanned Underwater Vehicle, Northwestern Polytechnical University, Xi’an
710072, China
Received:
9
September
2017
In order to know the mechanical properties of filament-wound composite cylindrical shells subjected to hydrostatic pressure, solve the buckling problem of pressure hull in deep sea and provide reference for engineering design, it is necessary to research the stability of filament-wound composite cylindrical shells. Based on the theory of thin shells, the governing equations were derived. Stability of composite cylindrical shells was researched by employing Galerkin method to solve the eigenvalue equation. The critical buckling pressure was calculated for cross filament-wound, metal-filament-wound and angle filament-wound composite cylinders under hydrostatic pressure. Compared to the test results, the numerical solution was illustrated to be feasibility. On this basis, the numerical method was interacted with genetic algorithm to search optimum stacking sequence and filament winding angle. Three types of winding pattern [(±θ)12], [(±θ1)x/(±θ2)12-x] and [(±θ1)4/(±θ2)4/(±θ3)4] were investigated, . Further, the effects of winding angle and the corresponding layer number on the critical buckling pressure were evaluated. It was shown that winding angle variation affected the critical buckling pressure significantly. Stability was greatly improved by numerical optimization, and the maximum critical buckling loads are increased by 31.31%, 43.25% and 57.51% compared with the base line, respectively. As the number of design variable increased, the carrying capacity was improved markedly. The optimal critical buckling pressure was increased by 57.17%.
摘要
为更清楚地认识静水压力作用下纤维缠绕圆柱壳体的耐压特性、解决深海耐压舱体的结构稳定性问题以及给工程设计提供参考,有必要对纤维缠绕圆柱壳体的结构稳定性进行深入研究。在弹性薄壳理论的基础上,推导出纤维缠绕圆柱壳体稳定性控制方程,采用Galerkin方法求解纤维缠绕圆柱壳体受静水压力作用下的临界失稳载荷。以正交缠绕、金属-纤维缠绕复合结构、斜交缠绕等几种形式的壳体结构为对象进行解析,并与实验结果对比,验证了求解的有效性和正确性。在此基础上,建立了基于遗传算法与解析方案一体式的优化平台,对[(±θ)12],[(±θ1)x/(±θ2)12-x]及[(±θ1)4/(±θ2)4/(±θ3)4]缠绕形式的圆柱壳体进行优化设计,研究纤维缠绕角度、对应层数及设计变量个数对临界失稳载荷的影响。结果表明,纤维缠绕角度对临界失稳载荷有显著影响,通过数值优化稳定性分别提高31.31%,43.25%及57.17%;随着角度变量的增加,优化得到的临界失稳载荷越大,最优可提高57.17%。
Key words: hydrostatic pressure / filament-wound / cylindrical shells / stability / critical buckling pressure
关键字 : 静水压力 / 纤维缠绕 / 圆柱壳体 / 稳定性 / 临界失稳载荷
© 2018 Journal of Northwestern Polytechnical University. All rights reserved.
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