Experimental study on the impact resistance of fill-enhanced mechanical metamaterials

IF 7.1 1区 工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Mechanical Sciences Pub Date : 2024-10-28 DOI:10.1016/j.ijmecsci.2024.109799
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Abstract

Mechanical metamaterials are attracting increasing interest as artificial architected/composite materials with unprecedented physical properties and promising engineering applications. To address the gaps in current research, particularly the lack of comprehensive insights into reusable, adaptive behaviors and the potential for enhanced energy absorption in the zero Poisson's ratio (ZPR) domain, a family of 3D ZPR mechanical metamaterials composed of thin-plate and axisymmetric thin-shell segments is introduced. Mechanical performance, self-recovery under large deformations, reusable, and strain rate-dependent adaptive energy absorption are achieved. Furthermore, the mechanical performance and functionality of the semi-closed structure composed of both plates and curved shell (SPCS) are further enhanced by filling shear thickening gel (STG). Quasi-static compression and drop-weight impact tests are carried out to investigate the mechanical properties of the SPCS and the influence of impact velocities on its energy absorption performance, quantifying the enhancement effect of filling STG and demonstrating the resistance of SPCS to secondary and even multiple impacts. The extrusions resulting from spatial constraints between the axisymmetric shell containers and the STG fillers enhance strength and plateau stress, improve impact resistance, and enable adaptive energy absorption. The variation in stiffness and energy absorption of filled-SPCS with strain rate adeptly resolves the conflict between comfort and functionality in designs such as wearable protective devices, blast protection, and reactive armor, thereby paving the way for the development of strain rate-dependent mechanical metamaterials. Collectively, a series of ZPR mechanical metamaterials, which offer better energy absorption, broader applicability, enhanced adaptability, and reusability compared to traditional lattices, are introduced. This contributes to insights and guidance to the development of cushioning energy-absorbing metamaterial designs.

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关于填充增强机械超材料抗冲击性的实验研究
机械超材料作为人工结构/复合材料,具有前所未有的物理特性和广阔的工程应用前景,正吸引着越来越多的关注。为了弥补当前研究的不足,特别是对零泊松比(ZPR)领域中可重复使用、自适应行为和增强能量吸收潜力缺乏全面了解,本文介绍了由薄板和轴对称薄壳片段组成的三维 ZPR 机械超材料系列。该系列材料实现了机械性能、大变形下的自我恢复、可重复使用以及随应变率变化的自适应能量吸收。此外,通过填充剪切增稠凝胶(STG),由板和曲面壳组成的半封闭结构(SPCS)的机械性能和功能得到了进一步提高。通过准静态压缩和落重冲击试验,研究了 SPCS 的机械性能以及冲击速度对其能量吸收性能的影响,量化了填充 STG 的增强效果,并证明了 SPCS 对二次甚至多次冲击的抵抗能力。轴对称壳体容器和 STG 填充物之间的空间约束产生的挤压增强了强度和高原应力,提高了抗冲击性,并实现了自适应能量吸收。填充型 SPCS 的刚度和能量吸收随应变速率的变化,巧妙地解决了可穿戴防护设备、爆炸防护和反应装甲等设计中舒适性和功能性之间的矛盾,从而为开发应变速率相关的机械超材料铺平了道路。与传统晶格相比,一系列 ZPR 机械超材料具有更好的能量吸收性、更广泛的适用性、更强的适应性和可重复使用性。这为缓冲吸能超材料设计的发展提供了启示和指导。
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来源期刊
International Journal of Mechanical Sciences
International Journal of Mechanical Sciences 工程技术-工程:机械
CiteScore
12.80
自引率
17.80%
发文量
769
审稿时长
19 days
期刊介绍: The International Journal of Mechanical Sciences (IJMS) serves as a global platform for the publication and dissemination of original research that contributes to a deeper scientific understanding of the fundamental disciplines within mechanical, civil, and material engineering. The primary focus of IJMS is to showcase innovative and ground-breaking work that utilizes analytical and computational modeling techniques, such as Finite Element Method (FEM), Boundary Element Method (BEM), and mesh-free methods, among others. These modeling methods are applied to diverse fields including rigid-body mechanics (e.g., dynamics, vibration, stability), structural mechanics, metal forming, advanced materials (e.g., metals, composites, cellular, smart) behavior and applications, impact mechanics, strain localization, and other nonlinear effects (e.g., large deflections, plasticity, fracture). Additionally, IJMS covers the realms of fluid mechanics (both external and internal flows), tribology, thermodynamics, and materials processing. These subjects collectively form the core of the journal's content. In summary, IJMS provides a prestigious platform for researchers to present their original contributions, shedding light on analytical and computational modeling methods in various areas of mechanical engineering, as well as exploring the behavior and application of advanced materials, fluid mechanics, thermodynamics, and materials processing.
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