We describe here the quasi-static crushing behavior of novel classes of multiphase (hybrid) hierarchical lattice metamaterials. The first class is represented by a hybrid architecture combining a hierarchical honeycomb with polyurethane foam filler, while the second is a multiphase structure produced by injecting an alginate hydrogel into the hierarchical voids of the honeycomb metamaterial. Twelve different auxetic (i.e. negative Poisson’s ratio) and non-auxetic metamaterial architectures have been 3D printed and subjected to edgewise compression crushing loading. A parametric numerical analysis has been also performed using validated finite element models to identify best metamaterial architecture configurations. Configurations filled with the hydrogel showed a significant stabilization of the deformation mechanism during large deformation edgewise compression. The use of metamaterials designs with internal slots and round in the ribs also filled by polyurethane rigid semi-reticulated foam feature however significant increases in terms of specific stiffness, mean crushing force, strength and energy absorption. The enhancement is particularly evident for the hybrid lattice metamaterials auxetic configurations.

我们在这里描述新型多相（混合）分层晶格超材料的准静态挤压行为。第一类是将分层蜂窝与聚氨酯泡沫填料结合在一起的混合体系结构，而第二类是通过将藻酸盐水凝胶注入蜂窝超材料的分层空隙中而产生的多相结构。十二种不同的膨胀（即负泊松比）和非膨胀超材料结构已进行3D打印，并受到沿边压缩挤压载荷。还使用已验证的有限元模型进行了参数数值分析，以识别最佳的超材料结构配置。充满水凝胶的构型在大变形边缘压缩过程中显示出变形机理的显着稳定。使用具有内部狭槽和肋中的圆形​​的超材料设计，该结构也由聚氨酯硬质半网状泡沫填充，但是在比刚度，平均压碎力，强度和能量吸收方面有显着提高。对于混合晶格超材料的膨胀构造，这种增强特别明显。