Programmable, active lattice structures: Unifying stretch-dominated and bending-dominated topologies
Programmable, active lattice structures: Unifying stretch-dominated and bending-dominated topologies
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DOI：
10.1016/j.eml.2019.100461
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发表时间：
2019-05-01
影响因子：
4.7
通讯作者：
Shea, Kristina
中科院分区：
文献类型：
--
作者：
Wagner, Marius A.;Lumpe, Thomas S.;Shea, Kristina
胞状固体通常被分为以拉伸为主或以弯曲为主的结构。后者适用于能量吸收，而前者则用于轻量化、负重的应用。开发一种可以执行两种任务的统一结构仍然是一个挑战，但在诸如空间和机器人等应用中将是非常有利的，在这些应用中，需要结构来进行多任务，例如在发射期间提供能量吸收，并且在操作期间提供承载强度。在本文中，我们介绍了可编程主动晶格结构(PAL)，它被设计成在受到热刺激时经历受控的拓扑转变。这种转换是通过包含活动的可编程关节来实现的，这些关节通过改变晶格结构中的节点连接来在弯曲为主的拓扑和拉伸为主的拓扑之间进行切换。数值模拟和实验结果验证了所设计的行为。通过在两种拓扑之间切换，展示的主动晶格结构具有独特的能力，可以实时调整其机械性能，以响应操作过程中不断变化的性能要求，从而潜在地应用于空间结构和机器人。(C)2019爱思唯尔有限公司。保留所有权利。
Cellular solids are often classified as stretch-dominated or bending-dominated structures. While the latter is suitable for energy absorption, the former is used in lightweight, load carrying applications. Developing a unified structure that can perform both tasks remains a challenge yet would be highly advantageous in applications such as space and robotics, where a structure is required to multi-task, e.g. provide energy absorption during launch and also load carrying strength during operation. In this paper, we introduce programmable active lattice structures (PALS) that are designed to undergo a controlled topological transformation when subjected to a heat stimulus. This transformation is realized by the inclusion of active programmable joints that enable switching between a bending-dominated and a stretch-dominated topology through changing the nodal connectivity in the lattice structure. Numerical simulations and experimental results verify the intended behavior. By switching between the two topologies, the demonstrated active lattice structures feature the unique capability to tune their mechanical properties in real-time to react to changing performance requirements during operation with potential application to space structures and robotics. (C) 2019 Elsevier Ltd. All rights reserved.