Cellular materials have superior specific properties (e.g., specific strength, stiffness, and energy absorption) as compared to their monolithic material counterparts. With rapid advancements in additive manufacturing technology, the uniquely complex geometry of these materials – particularly periodic lattices – can be easily reproduced for additional experimental research, characterization, and potential industrial applications. This work utilizes the idea of shape transformers – previously employed to describe the structural efficiency of beams subjected to bending – to define new strut-based lattices, whose struts do not have the typical solid, circular cross-section shape. Both experimental and numerical model results have shown that this design parameter can be utilized to manipulate the crashworthiness efficiency of lattice materials. It is found that designing with a square or a rectangular cross-section could increase the plateau stress by up to 52% while increasing the mass normalized specific energy absorption by up to 32%.

与整体材料对应物相比，多孔材料具有优异的特定性能（例如，比强度、刚度和能量吸收）。随着增材制造技术的快速进步，这些材料独特的复杂几何形状（特别是周期性晶格）可以轻松复制，用于额外的实验研究、表征和潜在的工业应用。这项工作利用形状变换器的概念（之前用于描述弯曲梁的结构效率）来定义新的基于支柱的晶格，其支柱不具有典型的实心圆形横截面形状。实验和数值模型结果都表明，该设计参数可用于控制晶格材料的耐撞效率。研究发现，方形或矩形横截面的设计可以使平台应力增加高达 52%，同时使质量归一化比能量吸收增加高达 32%。