Fabrication of slender elastic shells by the coating of curved surfaces.
Fabrication of slender elastic shells by the coating of curved surfaces.
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DOI：
10.1038/ncomms11155
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发表时间：
2016-04-04
影响因子：
16.6
通讯作者：
Reis PM
中科院分区：
文献类型：
--
作者：
Lee A;Brun PT;Marthelot J;Balestra G;Gallaire F;Reis PM
存在各种制造技术来生产双曲率壳体，包括注塑、旋转和吹塑以及浸涂。然而，这些工业过程通常适合于大规模生产，并且不直接适用于实验室研究环境，其中需要可适应的、廉价的和可预测的原型工具。在这里，我们研究了快速制造半球形弹性壳涂层的曲面与聚合物溶液，产生一个几乎均匀的壳，聚合后的薄膜。我们的实验表征如何固化的聚合物影响其排水动力学，并最终选择壳厚度。涂层过程，然后合理化，通过理论分析，预测最终的厚度，在定量协议与实验和数值模拟的润滑流场。这种强大的制造框架应该是非常宝贵的薄弹性壳的力学和其内在的几何非线性的未来研究。 食品工业需要有效的方法来制备薄壳结构，例如空心巧克力蛋，这也与许多工业应用相关。在这里，李等人展示了如何制造具有几乎均匀但可调厚度的半球壳以产生弹性结构。
Various manufacturing techniques exist to produce double-curvature shells, including injection, rotational and blow molding, as well as dip coating. However, these industrial processes are typically geared for mass production and are not directly applicable to laboratory research settings, where adaptable, inexpensive and predictable prototyping tools are desirable. Here, we study the rapid fabrication of hemispherical elastic shells by coating a curved surface with a polymer solution that yields a nearly uniform shell, upon polymerization of the resulting thin film. We experimentally characterize how the curing of the polymer affects its drainage dynamics and eventually selects the shell thickness. The coating process is then rationalized through a theoretical analysis that predicts the final thickness, in quantitative agreement with experiments and numerical simulations of the lubrication flow field. This robust fabrication framework should be invaluable for future studies on the mechanics of thin elastic shells and their intrinsic geometric nonlinearities. Foods industry calls for effective methods to prepare thin shell structures, such as hollow chocolate eggs, which are also relevant to many industrial applications. Here, Lee et al. show how to fabricate hemispherical shells with nearly uniform yet tunable thickness to produce elastic structures.