论文标题
超轻和超速纳米卡片面板：机械分析，表征和设计原理
Ultralight and ultra-stiff nano-cardboard panels: mechanical analysis, characterization, and design principles
论文作者
论文摘要
我们介绍了一类超轻质和超速三明治面板，旨在用于照相悬浮应用，并使用计算分析和微机械测试研究其机械行为。三明治面板由两个面部板组成，该面板与一个芯相连，该芯由以蜂窝基六边形图案排列的空心圆柱形韧带组成。计算建模表明，与带有篮子芯的类似面板相比，面板具有优越的弯曲刚度和屈曲电阻，并且它们的行为得到了uflyand-Mindlin板板理论的很好描述。通过优化面部板厚度与韧带壁厚的比率，可以获得的面板的弯曲刚度比具有相同面积密度的实心板的弯曲刚度大于五个数量级以上。使用可扩展的微作业过程，我们证明面板的密度为20 kg/m^3的3x3 cm^2可以在几个小时内制成。面板的微型机械测试是通过使用纳米插入器偏转微型悬臂面板来进行的。悬臂面板的实验测量的弯曲刚度与计算结果非常吻合，证明了对微分化面板的尺寸，形式和特性的精美控制。
We introduce a class of ultra-light and ultra-stiff sandwich panels designed for use in photophoretic levitation applications and investigate their mechanical behavior using both computational analyses and micro-mechanical testing. The sandwich panels consist of two face sheets connected with a core that consists of hollow cylindrical ligaments arranged in a honeycomb-based hexagonal pattern. Computational modeling shows that the panels have superior bending stiffness and buckling resistance compared to similar panels with a basketweave core, and that their behavior is well described by Uflyand-Mindlin plate theory. By optimizing the ratio of the face sheet thickness to the ligament wall thickness, panels maybe obtained that have a bending stiffness that is more than five orders of magnitude larger than that of a solid plate with the same area density. Using a scalable microfabrication process, we demonstrate that panels as large as 3x3 cm^2 with a density of 20 kg/m^3 can be made in a few hours. Micro-mechanical testing of the panels is performed by deflecting microfabricated cantilevered panels using a nanoindenter. The experimentally measured bending stiffness of the cantilevered panels is in very good agreement with the computational results, demonstrating exquisite control over the dimensions, form, and properties of the microfabricated panels.
