改性多相剪切增稠液浸渍凯夫拉纤维复合材料的抗冲击性能

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-05-10 DOI:10.1016/j.tws.2025.113399

Shi Liu , Chang Zhao , Zechang Wen

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引用次数: 0

摘要

剪切增稠液（STFs）由于其独特的流变性能，在冲击防护方面表现出巨大的潜力。在本研究中，SiO2/PEG200分散体系用于制备具有质量分数梯度的多相stf。用纳米纤维素（CNC）和纳米碳化硅（SiC）等添加剂对stf进行进一步改性，形成改性多相剪切增稠液（mstf）。在凯夫拉纤维布中浸渍mstf，制备mstf -凯夫拉复合材料。扫描电镜和流变分析显示，58wt%被确定为剪切增厚效应的临界质量分数。高质量分数SiO2和CNC改性显著提高了STF团簇的剪切增稠和吸能性能，而SiC主要影响STF团簇的结构和刚度。温度流变学分析表明，添加剂改性有效地增强了STFs的温度适应性。在单纱和多纱拉拔实验中，低剪切率下MSTFs的剪切变薄行为对纱线的抗拉强度和抗滑性能产生负面影响。然而，在高剪切速率的落锤冲击试验中，MSTFs显著提高了纤维布的极限抗冲击能力和吸能能力。改性材料中，CNC提供了最好的防护性能，而SiC增强了材料防护的稳定性。基于LS-DYNA的数值模拟进一步证实了落重冲击实验中观察到的能量吸收行为。这些研究结果为开发MSTF-Kevlar纤维布复合材料的冲击防护应用提供了理论和实验指导。

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Impact protection performance of Kevlar fabric composites impregnated with modified multiphase shear thickening fluids

Shear thickening fluids (STFs) exhibit significant potential for impact protection owing to their unique rheological properties. In this study, a SiO₂/PEG200 dispersion system was used to formulate multi-phase STFs with a mass fraction gradient. STFs were further modified with additives, such as nanocellulose (CNC) and nano-silicon carbide (SiC), to create modified multi-phase shear thickening fluids (MSTFs). Kevlar fiber cloth was impregnated with MSTFs to prepare MSTF-Kevlar composites. Scanning electron microscopy and rheological analyses at normal temperature revealed that 58wt% was identified as the critical mass fraction for the shear-thickening effect. The modification of high-mass fraction SiO₂ and CNC significantly enhanced the shear thickening and energy absorption properties, while SiC mainly influenced the structure and stiffness of STF clusters. The variable-temperature rheology analysis revealed that additive modification effectively enhanced the temperature adaptability of STFs. In single-yarn and multi-yarn pulling experiments, the shear thinning behavior of MSTFs at low shear rates negatively affected the tensile strength and anti-slip properties of the yarns. However, under high shear rate conditions in drop-weight impact tests, MSTFs significantly improved the ultimate impact resistance and energy absorption capacity of the fiber cloth. Among the modified materials, CNC provided the best protective performance, while SiC enhanced the stability of material protection. Numerical simulations based on LS-DYNA further confirmed the energy absorption behavior observed in the drop-weight impact experiments. These findings provide both theoretical and experimental guidance for developing MSTF-Kevlar fiber cloth composites for impact protection applications.

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来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.