Material-geometry interplay in damping of biomimetic scale beams
Material-geometry interplay in damping of biomimetic scale beams
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DOI：
10.1063/5.0150081
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发表时间：
2023-03
影响因子：
4
通讯作者：
Hossein Ebrahimi;Milos Krsmanovic;Hessein Ali;Hossein Ebrahimi
中科院分区：
文献类型：
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作者：
Hossein Ebrahimi;Milos Krsmanovic;Hessein Ali;Hossein Ebrahimi
仿生鳞片复盖衬底是一种超结构，通过集体鳞片接触的几何形状显示出迷人的突现非线性。尽管在理解它们的弹性非线性方面取得了很大进展，但在动态范围内，它们由尺度滑动引起的耗散行为还相对较少被研究。最近发现的是粘性涌现现象，在这种现象中，鳞片之间的干库仑摩擦会导致整体多材料基材的明显粘性减振行为。与这种结构耗散相比，许多聚合物中常见的材料耗散从未被考虑过，特别是与几何因素协同作用。这里讨论了这一方面，为了简洁和清晰，材料的粘弹性是通过简单的开尔文-沃伊特模型引入的。结果对比了这两种结构体系中的两个阻尼源：材料粘弹性和几何摩擦比例接触。研究发现，虽然粘弹性阻尼器的有效阻尼力在局部上相似，但它遵循与干摩擦不同的阻尼谱，包括对阻尼器对称性和比阻尼力的明显不同的影响。
Biomimetic scale-covered substrates are architected meta-structures exhibiting fascinating emergent nonlinearities via the geometry of collective scales contacts. Despite much progress in understanding their elastic nonlinearity, their dissipative behavior arising from scales sliding is relatively uninvestigated in the dynamic regime. Recently discovered is the phenomena of viscous emergence, where dry Coulomb friction between scales can lead to apparent viscous damping behavior of the overall multi-material substrate. In contrast to this structural dissipation, material dissipation common in many polymers has never been considered, especially synergistically with geometrical factors. This aspect is addressed here, where material viscoelasticity is introduced via a simple Kelvin–Voigt model for brevity and clarity. The results contrast the two damping sources in these architectured systems: material viscoelasticity and geometrical frictional scales contact. It is discovered that although topically similar in effective damping, viscoelastic damping follows a different damping envelope than dry friction, including starkly different effects on damping symmetry and specific damping capacity.