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首页> 外文期刊>The Aeronautical Journal >Towards imperfection insensitive buckling response of shell structures-shells with plate-like post-buckled responses
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Towards imperfection insensitive buckling response of shell structures-shells with plate-like post-buckled responses

机译：走向不理想的壳结构不敏感屈曲响应-具有板状后屈曲响应的壳

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摘要

The imperfection sensitivity of cylindrical panels under compression loading is shown to be not only reduced but effectively eliminated using stiffness tailoring techniques. Shells are designed with variable angle-tow (VAT) laminae, giving their laminates variable-stiffness properties over the surface co-ordinates. By employing an asymptotic model of the nonlinear shell behaviour and a genetic algorithm, the post-buckling stability was maximised with respect to the VAT design variables. Results for optimised straight-fibre and VAT shells are presented in comparison with quasi-isotropic designs. In the straight-fibre case, small improvements in the post-buckling stability are shown to be possible but at the expense of the buckling load. In the VAT case, on the other hand, considerable improvements in the post-buckling stability are obtained and drops in axial stiffness and load associated with buckling are reduced to negligible levels. The improvements are shown to be a result of a benign membrane stress distribution prior to buckling and a localisation of the buckling mode. The asymptotic results are compared with non-linear finite-element analyses and are found to be in good agreement. Potential future multi-objective optimisation studies are discussed.
机译：使用刚度调整技术，不仅降低了圆柱形面板在压缩载荷下的缺陷敏感性，而且还有效消除了缺陷。壳体设计有可变角度拖曳（VAT）薄片，使它们的层压板在表面坐标上具有可变的刚度特性。通过采用非线性壳行为的渐近模型和遗传算法，相对于增值税设计变量，屈曲后的稳定性得以最大化。与准各向同性设计相比，给出了优化的直纤维和增值税外壳的结果。在直纤维的情况下，屈曲后稳定性的微小改善是可能的，但以屈曲载荷为代价。另一方面，在增值税的情况下，屈曲后的稳定性得到了很大的改善，并且与屈曲相关的轴向刚度和载荷的下降被减小到可以忽略的水平。改善是由于屈曲之前的良性膜应力分布和屈曲模式的局部化所致。将渐近结果与非线性有限元分析进行比较，发现结果吻合良好。讨论了潜在的未来多目标优化研究。

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