Dynamic response of flexible viscoelastic kerf structures of freeform shapes
Dynamic response of flexible viscoelastic kerf structures of freeform shapes
复制标题
自由形状的柔性粘弹性切口结构的动态响应
DOI：
10.1016/j.ijsolstr.2022.111895
复制
发表时间：
2022
影响因子：
3.6
通讯作者：
Muliana, Anastasia
中科院分区：
文献类型：
--
作者：
Shahid, Zaryab;Bond, Coleman Gustav;Johnson, Molly Saylor;Hubbard, James E.;Kalantar, Negar;Muliana, Anastasia
切口也被称为浮雕切割，是一种用于从刚性平面表面创建柔性自由曲面的技术。由于它们令人愉悦的美学，灵活性和被塑造成所需的自由形状的能力，它们在工程和建筑中有几个潜在的应用。切缝结构的灵活性和可重构性取决于几个切缝参数，如切割密度，尺寸的单元格，切割厚度，切割模式等。本研究的重点是使用切缝结构，以创建自由曲面和了解他们的动态响应的模态形状，共振频率，和应力波传播的可重构大型切缝结构。本文首先通过数学建模和实验研究了切口密度和单胞尺寸对单胞模态行为的影响。一个梁单元模型被用来捕捉切口结构的变形。其次，研究了均匀切割密度和过渡切割密度下两种切缝板的形状重构行为。这两个切口面板的动态响应，然后检查。对大型切缝板的分析表明，梁单元模型能够捕捉到切缝板的模态响应。切口面板的柔性使得能够进行局部和全局形状重新配置，这可以改变动态响应（即，模态响应和应力波传播）。我们进行了比较研究的形状重构（局部和整体）的模态响应和应力传播行为的切口面板的效果。总的来说，这些发现将有助于设计具有所需性能要求的室内和室外建筑的切口结构。
Kerfing which is also known as relief cutting is a technique used to create flexible freeform surfaces out of rigid planar surfaces. Due to their pleasing aesthetics, flexibility, and ability to be molded into desired freeform shapes, they have several potential applications in engineering and architecture. The flexibility and reconfigurability of kerf structures depend on several kerf parameters such as cut density, size of the unit cell, cut thickness, cut pattern, etc. This study focuses on using kerf structures to create freeform surfaces and understanding their dynamic response in terms of mode shapes, resonance frequencies, and stress wave propagation of reconfigurable large-scale kerf structures. The effect of kerf cut density and unit cell size on the unit-cell modal behaviors is first investigated using both mathematical modeling and experiments. A beam element model is used to capture deformations of kerf structures. Next, the shape reconfigurable behaviors of two kerf panels with uniform cut density and transitioning cut density are presented. The dynamic response of these two kerf panels is then examined. The analysis of large-scale kerf panels demonstrated the capability of the beam element model to capture the modal response of kerf panels. The flexibility of the kerf panels enables local and global shape reconfigurations, which can alter the dynamic response (i.e., modal response and stress wave propagation) of the kerf panels. We perform a comparative study on the effect of shape reconfiguration (local and global) on the modal response and stress propagation behavior of the kerf panel. Overall, these findings would help design kerf structures for indoor and outdoor architectures with desired performance requirements.