Characterizing strain-rate dependent longitudinal compressive property of carbon fiber composite tows using a novel test method

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology Pub Date : 2025-01-21 DOI:10.1016/j.compscitech.2025.111077

Jiahui Gu , Yang Bai , Hang Wu , Zhenqiang Zhao , Chao Zhang

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Abstract

The dynamic mechanical properties of composite tows, which bear the primary external loads and absorb a significant portion of energy, directly influence the impact resistance of textile composites. To the best of our understanding, this is the first exploratory study introducing a dynamic longitudinal compression test method for composite tows, based on a Split Hopkinson Pressure Bar (SHPB) system. The optimal fabrication method for composite tows has been ascertained through comparative analysis and characterization. Following experimental and numerical analyses, a dumbbell-shaped configuration has been validated for compression specimens, as it not only facilitates effective compression failure modes and stress equilibrium but also satisfies the other fundamental requirements of SHPB tests. Additionally, the percent bending of composite tows under compression was assessed utilizing an innovative dual-reflector method. Experimental results indicate that the dynamic compressive strength and failure strain at 700 s⁻¹ exhibit a significant increase of approximately 116% and 110%, respectively, in comparison to the quasi-static condition at 1.5 × 10⁻⁵ s⁻¹. Furthermore, a series of morphological examinations and analyses were performed to comprehend the rationale behind their disparities at diverse strain rates. The results reveal that kink bands and longitudinal splitting constitute the primary failure modes in dynamic compression, while fiber kinking emerges as the predominant mode under quasi-static loadings.

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用一种新的试验方法表征碳纤维复合材料轴向压缩性能随应变率的变化

复合纤维束承担主要的外载荷，吸收很大一部分能量，其动态力学性能直接影响纺织复合材料的抗冲击性能。据我们所知，这是首次引入基于分离式霍普金森压杆（SHPB）系统的复合材料拖曳动态纵向压缩测试方法的探索性研究。通过对比分析和表征，确定了复合拖曳的最佳制作方法。通过实验和数值分析，哑铃形结构不仅有利于有效的压缩破坏模式和应力平衡，而且满足SHPB试验的其他基本要求。此外，利用创新的双反射器方法评估了复合材料拖曳在压缩下的弯曲百分比。实验结果表明，在700 s−1条件下，动态抗压强度和破坏应变较1.5 × 10−5 s−1条件下的准静态条件分别显著提高了约116%和110%。此外，进行了一系列形态学检查和分析，以了解在不同应变速率下其差异背后的基本原理。结果表明：在动态压缩条件下，扭结带和纵向劈裂是主要的破坏模式，而在准静态加载条件下，纤维扭结是主要的破坏模式；

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来源期刊

Composites Science and Technology 工程技术-材料科学：复合

CiteScore

16.20

自引率

9.90%

发文量

611

审稿时长

33 days

期刊介绍： Composites Science and Technology publishes refereed original articles on the fundamental and applied science of engineering composites. The focus of this journal is on polymeric matrix composites with reinforcements/fillers ranging from nano- to macro-scale. CSTE encourages manuscripts reporting unique, innovative contributions to the physics, chemistry, materials science and applied mechanics aspects of advanced composites. Besides traditional fiber reinforced composites, novel composites with significant potential for engineering applications are encouraged.