4D printed bio-inspired polygonal metamaterials with tunable mechanical properties

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL Thin-Walled Structures Pub Date : 2024-10-21 DOI:10.1016/j.tws.2024.112609

Xueli Zhou , Hongpei Liu , Jifeng Zhang , Lei Ren , Lu Zhang , Qingping Liu , Bingqian Li , Chao Xu , Luquan Ren

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Abstract

Conventional vibration isolators are designed and assembled so that their structure and vibration isolation performance cannot be adjusted and have a single function when facing complex working conditions. Inspired by a cat's adaptive adjustment of its limb structure to land safely when leaping from a height, we designed a bio-inspired polygonal metamaterial and 3D-molded it based on 4D printing of shape memory polymers (SMP). Based on the shape memory effect of the SMP, the BPM can obtain arbitrary temporary shapes under the combined effect of temperature and force. According to the analysis of the energy absorption test, by change the compressive strain of the BPM temporary shape, it is possible to adjust the shape of the single-cell structure while decreasing its specific energy absorption by up to 80 %. The locally controllable compressive deformation and programmable mechanical properties of the BPM structure are achieved through rational structural parameter design. In addition, thermally tunable vibration-absorbing behavior is achieved by combining the tunable stiffness properties of the printed material. This study provides new possibilities for intelligent tuning of cushion vibration isolators under complex and variable operating conditions.

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具有可调机械特性的 4D 印刷生物启发多边形超材料

传统的隔振器在设计和组装时，其结构和隔振性能无法调整，在面对复杂工况时功能单一。受猫从高处跃下时自适应调整肢体结构以安全着陆的启发，我们设计了一种生物启发的多边形超材料，并基于形状记忆聚合物（SMP）的 4D 打印技术将其三维成型。基于 SMP 的形状记忆效应，BPM 可以在温度和力的共同作用下获得任意的临时形状。根据能量吸收试验的分析，通过改变 BPM 临时形状的压缩应变，可以调整单细胞结构的形状，同时降低其比能量吸收高达 80%。通过合理的结构参数设计，实现了 BPM 结构的局部可控压缩变形和可编程机械性能。此外，通过结合印刷材料的可调刚度特性，还实现了热可调振动吸收行为。这项研究为在复杂多变的工作条件下智能调节缓冲隔振器提供了新的可能性。

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来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.