Mechanical and damage behavior of short and continuous carbon fiber reinforced additively manufactured multiscale composite

IF 7.7 2区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES
Md Fazlay Rabbi , Brandon Fischer , Mohammod Minhajur Rahman , Richard C. Bell , Christian Carloni
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Abstract

In this study, a novel fused filament fabrication (FFF)-based additive manufacturing technique is developed to fabricate carbon fiber-reinforced (CFR) multiscale composites. The multiscale composites are fabricated by embedding macro-scale continuous woven carbon fibers (CCF) between the micro-scale short carbon (SC) fiber reinforced acrylonitrile butadiene styrene (ABS) polymer laminates. An experimental investigation is performed to observe the effect of raster orientations (+45°/-45°, 0°/90°, and 0°) and fiber content on the tensile and flexural properties of the fiber-reinforced multiscale composites. Digital image correlation (DIC) is used to obtain strain components on the surface of the specimens. Multiscale reinforced composites show superior mechanical properties as compared to short fiber reinforced composites. The CFR multiscale composites show 180 % higher ultimate tensile strength and 225 % higher tensile modulus, along with 61 % higher flexural strength and 107 % higher flexural modulus compared to the short carbon fiber-reinforced composite. The full-field strain distribution from DIC analysis shows strain concentration at void-rich regions, leading to transverse matrix cracking and eventual fiber and matrix failure under tensile loading. In contrast, flexural tests reveal tensile and compressive strain zones on the bottom and top parts of the specimen, respectively, with an upward shift of the neutral axis as tensile strain increases. Matrix cracking initiates at the tensile surface and propagates along the fiber-matrix interface, causing interfacial delamination. Morphological analysis identifies fiber breakage and pull-out, matrix failure, and fiber-matrix debonding as the dominant tensile failure loading, whereas flexurally loaded composites experience delamination, laminates buckling, and matrix failure.
短连续碳纤维增强增材制造多尺度复合材料的力学与损伤行为
本文研究了一种新型的基于熔丝制造(FFF)的增材制造技术,用于制备碳纤维增强(CFR)多尺度复合材料。将宏观连续编织碳纤维(CCF)嵌入微尺度短碳(SC)纤维增强丙烯腈-丁二烯-苯乙烯(ABS)聚合物层压板中制备多尺度复合材料。实验研究了光栅取向(+45°/-45°、0°/90°和0°)和纤维含量对纤维增强多尺度复合材料拉伸和弯曲性能的影响。采用数字图像相关(DIC)技术获取试件表面的应变分量。多尺度增强复合材料的力学性能优于短纤维增强复合材料。与短碳纤维增强复合材料相比,CFR多尺度复合材料的极限拉伸强度提高了180%,拉伸模量提高了225%,弯曲强度提高了61%,弯曲模量提高了107%。DIC分析的全场应变分布表明,在拉伸载荷作用下,应变集中在富含孔洞的区域,导致基体横向开裂,最终导致纤维和基体破坏。相比之下,弯曲试验分别在试件的底部和顶部显示拉伸和压缩应变区,随着拉伸应变的增加,中性轴向上移动。基体开裂起始于拉伸面,并沿纤维-基体界面扩展,导致界面分层。形态分析表明纤维断裂和拔出、基体破坏和纤维-基体脱粘是主要的拉伸破坏载荷,而弯曲加载的复合材料则经历分层、层合板屈曲和基体破坏。
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
Composites Communications
Composites Communications Materials Science-Ceramics and Composites
CiteScore
12.10
自引率
10.00%
发文量
340
审稿时长
36 days
期刊介绍: Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.
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