High compressive energy absorption and shape recovery behavior of additively manufactured textile-inspired cylindrical braided metamaterials

IF 11.1 1区 工程技术 Q1 ENGINEERING, MANUFACTURING
Ajay Jayswal, Polyxeni P. Angelopoulou, Sargun Singh Rohewal, Logan T. Kearney, Sumit Gupta, Christopher C. Bowland, Michael D. Toomey, Amit K. Naskar
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Abstract

Mechanical metamaterials (MMs) are engineered structures with unique mechanical properties that arise from their unique spatial arrangement or lattice-like structure. The most commonly designed MMs such as honeycomb and re-entrant auxetics are prone to failure at the sharp corners and weak joints due to the increased stress concentration under deformation. To mitigate this challenge, braided MM structures involving intertwining threads of nylon—forming curved unit cells—have been studied. These textile-inspired cylindrical braided metamaterials (CBMMs) with contrasting unit cells, namely diamond and regular CBMMs, were fabricated by 3D printing. The layer-by-layer deposited structure built by fused filament fabrication delivered an assembly of overlapped threads that are fused at the contact point. To understand deformation behavior of these MMs, finite element models were developed for various load scenarios including quasi-static compression, cyclic and creep loads at room temperature. Stress distribution, deformation mechanisms, and failure modes were analyzed and validated by experiments to analyze the geometries and associated performance. The diamond CBMMs showed stress softening at 30 % compressive strain, withstanding a load of ∼440 N, whereas the regular CBMMs at 50 % strain experienced ∼250 N. The diamond CBMMs delivered higher creep resistance under sustained load and better energy absorption under cyclic loading than the regular CBMMs. The latter, however, exhibited 94 % shape recovery in contrast to 88 % recovery in former prototype during their first cyclic load. This study helps design mechanical lightweight devices that endure significant sustained load and exhibit enhanced energy absorption and shape recovery characteristics in cyclic loading.
增材制造的纺织启发圆柱形编织超材料的高压缩能吸收和形状恢复行为
机械超材料(mm)是一种具有独特机械性能的工程结构,其独特的空间排列或晶格状结构产生了独特的机械性能。由于变形作用下应力集中的增加,最常用的mm结构在尖角处和弱接头处容易发生破坏,如蜂窝式和再入式mm结构。为了缓解这一挑战,研究人员研究了编织MM结构,其中包括交织的尼龙线,形成弯曲的单元细胞。这些受纺织品启发的圆柱形编织超材料(cbmm)具有对比鲜明的单元格,即钻石和规则的cbmm,是通过3D打印制造的。通过熔丝制造构建的逐层沉积结构提供了在接触点熔接的重叠螺纹组件。为了了解这些mm的变形行为,开发了各种载荷情景的有限元模型,包括室温下的准静态压缩、循环和蠕变载荷。对应力分布、变形机制和破坏模式进行了分析,并通过实验验证了其几何形状和相关性能。金刚石复合材料在30 %压缩应变下表现出应力软化,承受了~ 440 N的载荷,而在50 %应变下的常规复合材料则承受了~ 250 N的载荷。与常规复合材料相比,金刚石复合材料在持续载荷下具有更高的抗蠕变性能,在循环载荷下具有更好的能量吸收能力。然而,后者表现出94 %的形状恢复,而前原型在第一次循环加载期间的恢复为88 %。这项研究有助于设计机械轻量化装置,承受显著的持续载荷,并在循环载荷中表现出增强的能量吸收和形状恢复特性。
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来源期刊
Additive manufacturing
Additive manufacturing Materials Science-General Materials Science
CiteScore
19.80
自引率
12.70%
发文量
648
审稿时长
35 days
期刊介绍: Additive Manufacturing stands as a peer-reviewed journal dedicated to delivering high-quality research papers and reviews in the field of additive manufacturing, serving both academia and industry leaders. The journal's objective is to recognize the innovative essence of additive manufacturing and its diverse applications, providing a comprehensive overview of current developments and future prospects. The transformative potential of additive manufacturing technologies in product design and manufacturing is poised to disrupt traditional approaches. In response to this paradigm shift, a distinctive and comprehensive publication outlet was essential. Additive Manufacturing fulfills this need, offering a platform for engineers, materials scientists, and practitioners across academia and various industries to document and share innovations in these evolving technologies.
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