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【24h】Cellular variable stiffness materials for ultra-large reversible deformations in reconfigurable structures

机译蜂窝可变刚度材料,用于可重构结构中的超大可逆变形

【摘要】Structures that can physically adapt to fulfill many roles can enable a new generation of high-performance military systems. The key to achieving substantial benefit from shape-changing operations is large changes in structural geometry and stiffness. In this study, we demonstrate variable stiffness cellular materials capable of large global changes in area through local buckling modes. Furthermore, stiffness properties and Poisson ratios may be tailored to provide desirable structural reconfiguration properties such as negative Poisson ratio and highly anisotropic stiffness. However, stiffness properties of cellular materials are two to three orders of magnitude below their constitutive materials properties. Their elastic properties can vary considerably as a function of the applied strain level due to the redistribution of structural material within the cells. Another complication is the difficulty in controlling the local buckling mode due to sensitivity to boundary conditions and loading conditions.

【摘要机译】可以物理适应各种任务的结构可以实现新一代高性能军事系统。从形状更改操作中获得实质性收益的关键是结构几何形状和刚度的巨大变化。在这项研究中,我们证明了可变刚度的蜂窝材料能够通过局部屈曲模式在面积上进行大的全局变化。此外,可以调整刚度性质和泊松比以提供期望的结构重整性质,例如负泊松比和高度各向异性的刚度。但是,多孔材料的刚度特性比其本构材料特性低两到三个数量级。由于孔内结构材料的重新分布,它们的弹性性能可能会随所施加的应变水平而显着变化。另一个复杂因素是由于对边界条件和载荷条件的敏感性而难以控制局部屈曲模式。

【作者】C. Henry;G. McKnight;

【作者单位】HRL Laboratories, LLC, 3011 Malibu Canyon Rd., Malibu, CA 90265;

【年(卷),期】2006(),

【年度】2006

【页码】P.617023.1-617023.12

【总页数】12

【原文格式】PDF

【正文语种】eng

【中图分类】TB30;

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