Efficient snap-through of spherical caps by applying a localized curvature stimulus
Efficient snap-through of spherical caps by applying a localized curvature stimulus
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DOI：
10.1140/epje/s10189-021-00156-0
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发表时间：
2021-08
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影响因子：
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通讯作者：
Lucia Stein-Montalvo;Jeong-Ho Lee;Yi Yang;Melanie Landesberg;Harold S. Park;D. Holmes
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作者：
Lucia Stein-Montalvo;Jeong-Ho Lee;Yi Yang;Melanie Landesberg;Harold S. Park;D. Holmes
在MEMS致动器和其他工程设备中，均匀刺激（例如，机械的、化学的、热的或磁的）经常施加到整个壳体上以引发突穿不稳定性。在这项工作中，我们证明，限制壳边界的有效面积允许其大小的大幅度减少，从而减少了所需的能量输入驱动壳。要做到这一点，我们结合联合收割机理论与1维有限元模拟的球冠与非均匀分布的刺激响应材料。We rely依靠on the effectivecurvature有效curvature曲率stimulus刺激，i.e.，由非机械刺激引起的自然曲率，这确保了我们的结果完全与刺激无关。为了验证我们的数字和证明这一普遍性，我们还进行了两组实验，其中我们useresidual swellingof双层硅树脂dielectors-一个过程，模仿差异增长-以及磁弹性体诱导曲率，导致通过。我们的研究结果阐明了潜在的机制，提供了一个直观的路线，以优化设计，实现高效的管理单元。图形摘要
In bistable actuators and other engineered devices, a homogeneous stimulus (e.g., mechanical, chemical, thermal, or magnetic) is often applied to an entire shell to initiate a snap-through instability. In this work, we demonstrate that restricting the active area to the shell boundary allows for a large reduction in its size, thereby decreasing the energy input required to actuate the shell. To do so, we combine theory with 1D finite element simulations of spherical caps with a non-homogeneous distribution of stimulus-responsive material. We rely on the effectivecurvature stimulus, i.e., the natural curvature induced by the non-mechanical stimulus, which ensures that our results are entirely stimulus-agnostic. To validate our numerics and demonstrate this generality, we also perform two sets of experiments, wherein we useresidual swellingof bilayer silicone elastomers—a process that mimics differential growth—as well as a magneto-elastomer to induce curvatures that cause snap-through. Our results elucidate the underlying mechanics, offering an intuitive route to optimal design for efficient snap-through.Graphical abstract