Pentamode metamaterials approximate tailorable artificial liquids. Recently,microscopic versions of these intricate three-dimensional structures have beenfabricated, but direct experimental characterization has not been possible yet.Here, using three-dimensional printing, we fabricate macroscopic polymer-basedsamples with many different combinations of the small connection diameter $d$and the lattice constant $a$. Direct measurements of the static shear modulusand the Young's modulus reveal that both scale approximately according to$(d/a)^3$, in good agreement with continuum-mechanics calculations. For thesmallest accessible values of $d/a \approx 1.5\%$, we find derived ratios ofbulk modulus $B$ to shear modulus $G$ of $B/G \approx 1000$.
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机译：五态超材料近似于可定制的人造液体。最近，已经制造出这些复杂的三维结构的微观版本，但是尚无法进行直接的实验表征。在这里，我们使用三维打印，制作了聚合物基的宏观样品，具有许多不同组合的小连接直径$ d $和晶格常数$ a $。对静态剪切模量和杨氏模量的直接测量表明，两者的比例大约根据$（d / a）^ 3 $，与连续力学计算非常吻合。对于$ d / a的最小可访问值\约1.5 \％$，我们发现导出的体积模量$ B $与剪切模量$ G $的比率为$ B / G \约1000 $。
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