Computational Design of Self‐Actuated Surfaces by Printing Plastic Ribbons on Stretched Fabric
Computational Design of Self‐Actuated Surfaces by Printing Plastic Ribbons on Stretched Fabric
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DOI：
10.1111/cgf.14489
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发表时间：
2022-05
影响因子：
2.5
通讯作者：
David Jourdan;M. Skouras;E. Vouga;A. Bousseau
中科院分区：
文献类型：
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作者：
David Jourdan;M. Skouras;E. Vouga;A. Bousseau
我们介绍了一种用于自驱动可展开结构的新机构，该机构基于在预拉伸的弹性织物上打印密集的紧密间隔的塑料带图案。我们利用了两种改变形状的效果，当这样的组件被打印并允许放松时：首先，不可压缩的塑料丝带阻碍了织物收缩回到其静止状态，迫使织物中的残余应变并产生固有的曲率。其次，在塑料层和织物层之间的界面上的差异压缩在带子的方向上产生了双层效应，使每个带子在平衡状态下形成圆弧，并产生外部曲率。我们描述了一种利用该机构提供的可控制的方向变形和曲率来制造低成本、轻量化的自由曲面原型的逆向设计工具。该方法的核心是一种参数化算法，它限定了沿主曲率方向和跨主曲率方向的表面扭曲，以及一种图案合成算法，该算法用丝带覆盖一个表面，以匹配上述参数化给出的目标扭曲和曲率。我们通过制造和测量各种表面，包括几乎可展开的表面以及平均曲率为正和负的表面，证明了我们方法的灵活性和准确性，这要归功于允许在织物两侧打印的简单硬件设置。
We introduce a new mechanism for self‐actuating deployable structures, based on printing a dense pattern of closely‐spaced plastic ribbons on sheets of pre‐stretched elastic fabric. We leverage two shape‐changing effects that occur when such an assembly is printed and allowed to relax: first, the incompressible plastic ribbons frustrate the contraction of the fabric back to its rest state, forcing residual strain in the fabric and creating intrinsic curvature. Second, the differential compression at the interface between the plastic and fabric layers yields a bilayer effect in the direction of the ribbons, making each ribbon buckle into an arc at equilibrium state and creating extrinsic curvature. We describe an inverse design tool to fabricate low‐cost, lightweight prototypes of freeform surfaces using the controllable directional distortion and curvature offered by this mechanism. The core of our method is a parameterization algorithm that bounds surface distortions along and across principal curvature directions, along with a pattern synthesis algorithm that covers a surface with ribbons to match the target distortions and curvature given by the aforementioned parameterization. We demonstrate the flexibility and accuracy of our method by fabricating and measuring a variety of surfaces, including nearly‐developable surfaces as well as surfaces with positive and negative mean curvature, which we achieve thanks to a simple hardware setup that allows printing on both sides of the fabric.