Compressive deformation modes and properties of 3D printed continuous fiber reinforced composite auxetic honeycomb structures regulated by structural parameters

IF 4.3 2区 工程技术 Q1 ENGINEERING, CIVIL
Depeng Wang, Yanlu Chang, Ping Cheng, Yanni Rao, Yong Peng, Kui Wang
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引用次数: 0

Abstract

In this study, continuous fiber reinforced composite (CFRC) auxetic honeycomb structures with different struts length ratios (h/l) and cell angles (θ) were designed and fabricated by 3D printing process. The compressive behaviors were investigated by in-plane compression tests in two directions (1- and 2-directions). The results showed that the structural deformation modes were influenced by structural parameters, thereby affecting compressive properties. h/l determined the strut contact forms, affecting the modes of structural deformation and stress evolution during compression. The structural deformation modes were divided into: strut-end no-contact collapse (h/l ≥ 2.0) and strut-end contact collapse (h/l < 2.0) in 1- direction; hinge-like collapse (h/l > 2.0), self-locking collapse (h/l = 2.0) and strut-end contact collapse (h/l < 2.0) in 2- direction. And the triggering strains of these deformation modes increased with θ. Besides, θ also determined the capability of inclined struts to resist deformation, influencing structural load-bearing capacity. The compressive modulus and energy absorption showed a consistent dependence on θ, with opposite trends in different compressive directions. Moreover, the negative Poisson's ratio characteristics were also affected by structural parameters. Large θ (e.g. 75°) in 1-direction and small θ (e.g. 30°) in 2-direction should be avoided, as they could not maintain negative Poisson's ratio characteristics at large deformation. Finally, a comprehensive assessment method was proposed, and 2.0–60° specimen exhibited the best comprehensive performance among 60° specimens. This work provided references for the structural design and performance customization of 3D printed CFRC auxetic honeycomb structures.
3D打印连续纤维增强复合材料蜂窝结构的压缩变形模式及性能
本研究采用3D打印技术,设计并制造了具有不同支撑长度比(h/l)和单元角(θ)的连续纤维增强复合材料(CFRC)减缩蜂窝结构。通过平面内1向和2向压缩试验研究了其压缩特性。结果表明:结构参数会影响结构的变形模式,从而影响其抗压性能;H /l决定了支撑的接触形式,影响了压缩过程中结构的变形模式和应力演化。结构变形模式分为1向柱端无接触坍塌(h/l≥2.0)和1向柱端接触坍塌(h/l < 2.0);2向折页式折叠(h/l < 2.0)、自锁式折叠(h/l = 2.0)和杆端接触式折叠(h/l < 2.0)。各变形模式的触发应变随θ的增大而增大。θ还决定了斜支抗变形能力,影响结构的承载能力。压缩模量和能量吸收随θ的变化趋势一致,不同压缩方向的变化趋势相反。此外,负泊松比特性也受结构参数的影响。应避免1方向大θ(如75°)和2方向小θ(如30°),因为它们不能在大变形时保持负泊松比特性。最后,提出了一种综合评价方法,在60°试件中,2.0 ~ 60°试件的综合性能最好。为3D打印CFRC消声蜂窝结构的结构设计和性能定制提供参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Structures
Structures Engineering-Architecture
CiteScore
5.70
自引率
17.10%
发文量
1187
期刊介绍: Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.
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