This work introduces a novel truss stiffener concept for lightweight structural panels as an alternative to sandwich panels or stringer stiffened panels. The Wrapped Tow Reinforced (WrapToR) truss concept is modified to create stiffened composite panel structures (referred to here as WrapToR Shells). A prototype WrapToR Shell unit cell is manufactured and tested under three-point bending, where it demonstrates high levels of specific stiffness and strength. This experimental result is benchmarked against idealised sandwich panels via a low fidelity comparative analysis, and the study shows that even a best-case sandwich panel of equivalent mass under a representative bending load has an 83% increase in displacement, highlighting the excellent stiffness truss reinforced panels can provide. The design space available to the truss reinforced panels is then explored using finite element analysis and a simple parameter sweep of key truss design variables. A Pareto frontier between the competing objectives of minimising mass and maximising rigidity is shown, and global trends in performance are highlighted. It is observed that increasing the size of the truss profile or longitudinal member has a near linear increase on EI/mass, whereas for increasing shear member angle the inverse is true. For increasing shear member diameter, a less obvious effect on EI/mass is seen, indicating a more complex relationship with the other design variables.

中文翻译：

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WrapToR shell：概念介绍、实验测试和设计空间探索

这项工作引入了一种用于轻型结构板的新型桁架加劲肋概念，作为夹层板或纵梁加劲板的替代品。包裹丝束增强 (WrapToR) 桁架概念经过修改，可创建加劲复合面板结构（此处称为 WrapToR 壳）。原型 WrapToR Shell 单元在三点弯曲下制造和测试，表现出高水平的比刚度和强度。该实验结果通过低保真度比较分析与理想夹芯板进行了基准测试，研究表明，即使是等效质量的夹​​芯板在代表性弯曲载荷下的最佳情况下，位移也增加了 83%，凸显了桁架加固的出色刚度面板可以提供。然后使用有限元分析和关键桁架设计变量的简单参数扫描来探索桁架加固面板可用的设计空间。显示了最小化质量和最大化刚性这两个竞争目标之间的帕累托前沿，并突出了性能的全球趋势。据观察，增加桁架轮廓或纵向构件的尺寸，EI/质量几乎呈线性增加，而对于增加剪切构件角度，则相反。对于增加抗剪构件直径，对 EI/质量的影响不太明显，表明与其他设计变量的关系更加复杂。