Additively Manufactured Mechanical Metamaterials for Blast and Impact Protection

增材制造为设计用于冲击能量吸收的高性能蜂窝材料提供了新的机会。最近的研究表明，在高应变速率加载条件下，使用选择性激光熔化AM工艺生产的金属细胞材料具有潜在的性能。拟议的项目将追求两个新的研究领域：(1)含有形状记忆合金的细胞材料的AM加工，以及(2)应用这种理解来开发能够改变结构的智能冲击吸能材料。预计在航天工业中有两个新颖和具有挑战性的应用领域：(a)用于车辆着陆影响的可重复使用能量吸收器；(b)防止空间碎片撞击的自我修复保护。该研究将作为博士项目进行，分为两个阶段。(1)将目前对细胞几何形状、增材制造工艺参数和高应变率力学性能之间耦合的理解扩展到SMA。SMA的结果将与更成熟的合金进行比较。(2)制定包含SMA的AMcellular材料的设计策略，以实现有效的冲击保护和几何重构。这将考虑这些功能和设计优化之间的任何权衡。研究将首先集中于与应用(a)相关的冲击情景，然后将扩展到考虑应用(b)的明显更高的冲击速度范围。

Additive Manufacturing presents new opportunities for the design of high performance cellular materialsfor impact energy absorption. Recent research has demonstrated the performance potential of metalliccellular materials produced using Selective Laser Melting AM processes under high strain rate loadingconditions. The proposed project will pursue two novel areas of research: (1) AM processing of cellularmaterials containing Shape Memory Alloy, and (2) application of this understanding to develop smartimpact energy absorbing materials capable of configurational change. Two novel and challengingapplication areas are anticipated within the Space Industry: (a) reusable energy absorbers for vehiclelanding impacts; (b) self-healing protection against space debris impact. The research will be carried outas a PhD project, consisting of two phases. (1) Extend current understanding of the coupling betweencellular geometry, AM processing parameters and high strain rate mechanical properties to SMA. Resultsfor SMA will be compared with more established alloys. (2) Develop strategies for the design of AMcellular materials incorporating SMA, that achieve both effective impact protection and geometryreconfiguration. This will consider any trade-off between these functions, and design optimisation. Theresearch will focus first on impact scenarios relevant for application (a), and will then be extended toconsider the significantly higher impact velocity regime of application (b).