Architected lattices with adaptive energy absorption
Architected lattices with adaptive energy absorption
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DOI：
10.1016/j.eml.2019.100557
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发表时间：
2019-11-01
影响因子：
4.7
通讯作者：
Daraio, Chiara
中科院分区：
文献类型：
--
作者：
Wang, Yifan;Ramirez, Brian;Daraio, Chiara
能量吸收材料（例如防护设备中使用的泡沫）能够在低应力下发生大变形，从而将传入的应力波降低到伤害或损坏阈值以下。它们通常可以通过塑性变形或破碎有效地吸收能量。然而，现有的解决方案是被动的，仅对特定威胁有效，并且通常在使用后被损坏。在这里，我们克服了这些限制，设计了使用填充颗粒的结构化晶格的能量吸收材料。我们使用结构化网格来利用构件的受控弯曲和屈曲来增强能量吸收。我们主动控制晶格内的负压水平，以调节颗粒的干扰相变，从而诱导可控的能量吸收和可恢复的变形。与被动晶格相比，我们的系统显示出超过一个数量级的可调刚度和屈服强度，并将不同级别的传递冲击应力降低高达 40%。所展示的自适应能量吸收系统具有广泛的潜在应用，从个人防护设备、车辆安全系统到航空航天结构。 (C) 2019 Elsevier Ltd. 保留所有权利。
Energy absorbing materials, like foams used in protective equipment, are able to undergo large deformations under low stresses, reducing the incoming stress wave below an injury or damage threshold. They are typically effective in absorbing energy through plastic deformation or fragmentation. However, existing solutions are passive, only effective against specific threats and they are usually damaged after use. Here, we overcome these limitations designing energy absorbing materials that use architected lattices filled with granular particles. We use architected lattices to take advantage of controlled bending and buckling of members to enhance energy absorption. We actively control the negative pressure level within the lattices, to tune the jamming phase transition of the granular particles, inducing controllable energy absorption and recoverable deformations. Our system shows tunable stiffness and yield strength by over an order of magnitude, and reduces the transmitted impact stress at different levels by up to 40% compared to the passive lattice. The demonstrated adaptive energy absorbing system sees wide potential applications from personal protective equipment, vehicle safety systems to aerospace structures. (C) 2019 Elsevier Ltd. All rights reserved.