Compressive behaviour of cellular structures with aperiodic order
Compressive behaviour of cellular structures with aperiodic order
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DOI：
10.1016/j.rinma.2022.100293
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发表时间：
2022-06
影响因子：
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通讯作者：
R. Moat;E. Muyupa;C. Imediegwu;D. Clarke;I. Jowers;U.G. Grimm
中科院分区：
文献类型：
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作者：
R. Moat;E. Muyupa;C. Imediegwu;D. Clarke;I. Jowers;U.G. Grimm
蜂窝结构在工程应用中是常见的，例如航空航天和医学工程，因为材料-空气复合材料提供显著的机械益处，例如由于改进的重量-强度比。通常，蜂窝结构基于周期性重复的单位单元的图案，诸如正方形或六边形，但是图案的周期性性质和可用的对称性引起各向异性性能。这就是具有非周期性顺序的模式是可行的替代方案的地方。具有旋转对称性但没有平移重复的图案不具有产生机械各向异性的对称顺序，因此有可能缓解该问题。在这项研究中，使用增材制造来创建基于Penrose P3非周期性镶嵌的2.5D，45%密度的蜂窝立方体。然后在压缩载荷下对这些进行测试。为了比较的目的，还使用相同的工艺制造了基于周期性图案的蜂窝立方体。结果表明，显着改善各向同性和显着不同的进展的应变局部化的蜂窝的基础上彭罗斯P3模式相比，在弹性和塑性变形的周期性比较。
Cellular structures are commonplace in engineering applications, such as aerospace and medical engineering, because material-air composites offer significant mechanical benefits, for example due to improved weight-to-strength ratio. Typically, cellular structures are based on patterns of periodically repeating unit cells, such as squares or hexagons, but the periodic nature and the available symmetries of the patterns give rise to anisotropic performance. This is where patterns with aperiodic order are a viable alternative. Patterns created with rotational symmetry, yet no translational repetition do not possess the orders of symmetry from which mechanical anisotropy originates and therefore have the potential to mitigate this issue. In this study, additive manufacturing was used to create 2.5D, 45% dense, honeycomb cuboids based on the Penrose P3 aperiodic tiling. These were then tested under compression loading. Honeycomb cuboids based on periodic patterns were also manufactured using identical processes for the purpose of comparison. The outcome shows a significant improvement in isotropy and notably different progression of strain localisation for the honeycombs based on Penrose P3 patterns compared to the periodic comparisons during both elastic and plastic deformation.