A class of aperiodic honeycombs with tuneable mechanical properties
A class of aperiodic honeycombs with tuneable mechanical properties
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DOI：
10.1016/j.apmt.2024.102127
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发表时间：
2024-04
影响因子：
8.3
通讯作者：
R. Moat;Daniel John Clarke;F. Carter;Dan Rust;I. Jowers
中科院分区：
文献类型：
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作者：
R. Moat;Daniel John Clarke;F. Carter;Dan Rust;I. Jowers
超材料是一个很有前途的研究领域，提供了定制设计组件的机械性能以解决特定工程问题的潜力。这些合成材料是工程结构，其行为来自内部几何形状以及基础材料的特性。已经表明，设计这样的结构以产生单一的期望性质是相对简单的，然而，设计产生期望性质的组合的结构仍然是一个挑战。本文关注的是一类蜂窝状的超材料，提供独立和各向同性修改两个基本的机械性能，泊松比和弹性模量的潜力。最近发现的“帽子”单片引入了一种新的非周期性图案来研究作为蜂窝结构的基础，并且据报道，这种结构在相对密度的范围内具有零泊松比，因此，在相对刚度的范围内。与大多数其他非周期性镶嵌不同，“帽子”是非周期性镶嵌的连续家族的一部分，这使得有机会通过修改镶嵌的几何特性来调整机械特性的组合，同时保持各向同性。在这里，我们提出了完整的家庭瓷砖和评估其机械性能都通过测试和模拟。从计算建模的结果表明，这个家庭的超材料的行为是各向同性的，他们提供了一个泊松比从0.01到0.49的相对密度的范围内，导致令人兴奋的结论，泊松比和弹性模量可以独立调整。我们设想，这一发现将有利于工程部件的设计，例如，通过提供将超材料部件的机械性能与周围部件或材料的机械性能相匹配以减少干扰应力的可能性。
Metamaterials are a promising area of research, offering the potential to customise the mechanical properties of designed components to address specific engineering problems. These synthetic materials are engineered structures, the behaviour of which is derived from internal geometry as well as the properties of the base-material. It has been shown that designing such structures to give rise to a single desired property is relatively simple, however designing structures that give rise to combinations of desirable properties remains a challenge. This paper is concerned with a class of honeycomb metamaterials that offer the potential to independently and isotropically modify two fundamental mechanical properties, the Poisson's ratio and the Elastic modulus. The recently discovered ‘hat’ monotile introduced a new aperiodic pattern to investigate as the basis of honeycomb structures, and it has been reported that such structures have zero Poisson's ratio at a range of relative densities and, consequently, at a range of relative stiffnesses. Unlike most other aperiodic tilings, the ‘hat’ is part of a continuous family of aperiodic tilings, which gives the opportunity to tune combinations of mechanical properties by modifying the geometric properties of the tiling, all while maintaining isotropy. Here we present the full family of tilings and assess their mechanical behaviour both through testing and simulation. Results from computational modelling show that the behaviour of this family of metamaterials is isotropic and they offer a Poisson's ratio from 0.01 to 0.49 at a range of relative densities, leading to the exciting conclusion that Poisson's ratio and Elastic modulus can be tuned independently. We envisage that this finding will benefit the design of engineering components, for example by offering the possibility to match mechanical properties of metamaterial components with those of surrounding components or materials to reduce interference stresses.