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On Extension-Shearing Bending-Twisting coupled laminates

机译：拉伸剪切弯曲扭曲耦合层压板

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This article presents details of the development of a special class of laminate, possessing Extension-Shearing Bending-Twisting coupling, necessary for optimised passive-adaptive flexible wing box structures. The possibility of achieving a measurable drag reduction in cruise flight, without the cost or reliability issues associated with active control mechanisms, is of significant interest for achieving increased fuel burn efficiency, and meeting associated emissions targets. The introduction of passive Bending-Twisting coupling at the wing-box level has been previously demonstrated through laminate level tailoring with Extension-Shearing coupling only, but the limited design space and the possibility for ply terminations (to produce tapered thickness) effectively rule out this special class of laminate for practical construction. The study is now broadened to consider laminates with Extension-Shearing Bending-Twisting coupling, beyond the less well-known un-balanced and symmetric design rule or indeed balanced and symmetric designs with off-axis alignment. Results reveal a vast laminate design space with Extension-Shearing coupling that can be maximised without the unfavourable strength characteristics associated with off-axis alignment. Results also reveal that shear buckling strength can be maximised through Bending-Twisting coupling when load reversal is not a design constraint. (C) 2016 Elsevier Ltd. All rights reserved.
机译：本文详细介绍了一类特殊的层压板的开发细节，该层压板具有伸缩剪切-弯曲-扭曲耦合，这对于优化被动适应性柔性翼盒结构是必不可少的。对于实现增加的燃油燃烧效率并满足相关的排放目标，在不增加与主动控制机制相关的成本或可靠性问题的情况下，实现巡航飞行中可测量的阻力减小的可能性是非常重要的。以前仅通过伸缩剪接层合板的剪裁就证明了在机翼盒级引入无源弯扭弯管联接，但是有限的设计空间和层板端接的可能性（产生渐缩的厚度）有效地排除了这种情况。特殊类别的层压板，用于实际施工。现在，研究范围已扩大到考虑具有拉伸-剪切-弯曲-扭曲耦合的层压板，而不是鲜为人知的不平衡和对称设计规则，或者实际上是偏轴对齐的平衡和对称设计。结果表明，具有扩展-剪切耦合的层压板设计空间很大，可以最大化，而不会产生与轴外对齐相关的不利强度特性。结果还表明，当载荷反向不是设计约束时，可以通过弯曲-扭曲耦合使剪切屈曲强度最大化。 （C）2016 Elsevier Ltd.保留所有权利。

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