Pseudo-bistable pre-stressed morphing composite panels
Pseudo-bistable pre-stressed morphing composite panels
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DOI：
10.1016/j.ijsolstr.2012.11.019
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发表时间：
2013-04-01
影响因子：
3.6
通讯作者：
Weaver, P. M.
中科院分区：
文献类型：
--
作者：
Brinkmeyer, A.;Pirrera, A.;Weaver, P. M.
在预应力复合板中，已经证明存在于球形穹顶中的伪弯曲现象也得到了证实。这种变形结构的新概念使用固有材料粘弹性来被动地在其不同状态之间驱动结构。首先将伪非线性结构卡入屈曲状态，并允许其在恒定应变下松弛。一旦致动被移除，结构在快速返回到其初始状态之前保持在其屈曲配置一段时间。在本文中，伪的行为的原则，首先概述了使用离散桁架模型。一个等效的数值模型，然后用来显示如何赋予结构的时间依赖性行为可以通过选择的预应变边界条件进行控制。接下来，示出了复合材料铺层对伪塑性行为的影响，并给出了体积分数限制。最后，初步的实验结果证实了数值模拟。(C)2012爱思唯尔有限公司保留所有权利。
The pseudo-bistable phenomenon already shown to exist in the case of spherical domes is demonstrated in pre-stressed composite panels. This new concept for morphing structures uses intrinsic material viscoelasticity to actuate the structure passively between its different states. A pseudo-bistable structure is first snapped into a buckled state and allowed to relax under a constant strain. Once the actuation is removed, the structure remains in its buckled configuration for a period of time, before quickly returning to its initial state. In this paper, the principles of the pseudo-bistable behaviour are first outlined using a discrete truss model. An equivalent numerical model is then used to show how the time-dependent behaviour imparted to the structure can be controlled by the choice of the pre-straining boundary conditions. Next, the effect of a composite layup on the pseudo-bistable behaviour is shown, and a volume fraction limit is given. Finally, preliminary experimental results confirm the numerical simulations. (C) 2012 Elsevier Ltd. All rights reserved.