Multifunctional periodic cellular metals
Multifunctional periodic cellular metals
复制标题
DOI：
10.1098/rsta.2005.1697
复制
发表时间：
2006-01-15
期刊：
影响因子：
5
通讯作者：
Wadley, HNG
中科院分区：
文献类型：
--
作者：
Wadley, HNG
蜂窝和波纹结构的周期性蜂窝金属被广泛用于轻质夹层板结构的芯材。蜂窝具有封闭的蜂窝孔，非常适合热保护，同时还提供有效的负载支持。波纹磁芯结构提供了效率较低且高度各向异性的负载支撑，但提供了横流换热机会，因为它们的气孔在一个方向上是连续的。最近在拓扑设计和制造方面的进展导致了具有开孔结构的网架结构的出现。这三类周期性胞状金属现在可以用各种各样的结构合金来制造。当被配置为夹芯板的核心时，许多拓扑结构被发现为结构载荷支撑提供了足够的刚度和强度。芯层相对密度为2-10%，单元尺寸在毫米范围内的夹芯板正在被评估为多功能结构。网架拓扑结构的开放、三维相互连接的孔道网络提供了同时支持高应力的机会，同时也实现了横流换热。这些高度可压缩的结构还为减轻空气或水中的撞击和冲击波造成的高强度动态载荷提供了机会。通过用聚合物和硬质陶瓷填充空隙，这些结构也被发现能够显著抵抗炮弹的侵彻。
Periodic cellular metals with honeycomb and corrugated topologies are widely used for the cores of light weight sandwich panel structures. Honeycombs have closed cell pores and are well suited for thermal protection while also providing efficient load support. Corrugated core structures provide less efficient and highly anisotropic load support, but enable cross flow heat exchange opportunities because their pores are continuous in one direction. Recent advances in topology design and fabrication have led to the emergence of lattice truss structures with open cell structures. These three classes of periodic cellular metals can now be fabricated from a wide variety of structural alloys. Many topologies are found to provide adequate stiffness and strength for structural load support when configured as the cores of sandwich panels. Sandwich panels with core relative densities of 2-10% and cell sizes in the millimetre range are being assessed for use as multifunctional structures. The open, three-dimensional interconnected pore networks of lattice truss topologies provide opportunities for simultaneously supporting high stresses while also enabling cross flow heat exchange. These highly compressible structures also provide opportunities for the mitigation of high intensity dynamic loads created by impacts and shock waves in air or water. By filling the voids with polymers and hard ceramics, these structures have also been found to offer significant resistance to penetration by projectiles.