Low-velocity impact and compression-after-impact behaviors of carbon/glass fiber hybrid composite laminates based on thin-ply carbon fiber prepreg and unidirectionally arrayed chopped strand

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL Thin-Walled Structures Pub Date : 2025-02-19 DOI:10.1016/j.tws.2025.113075

Yinyuan Huang , Ya Liu , Haohao Liu , Siqi Zhang , Junfeng Hu , Jianping Zhao

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Abstract

The impact resistance is one of the most important mechanical properties of lightweight fiber-reinforced polymer composites (FRPs), which directly affects its application in engineering fields. However, due to the inherent brittleness of fibers, the mutual exclusion of strength and toughness has become one of the bottlenecks in FRP design. Considering the effect of hybrid structure and short fiber on improving the pseudo-ductility of FRP laminates, in this study, short fiber structures were prepared by introducing discontinuous slits into the thin-ply carbon fiber prepregs and mixing with glass fiber prepregs to fabricate carbon/glass fiber hybrid laminates (C/G). Low-velocity impact (LVI) tests and compression-after-impact (CAI) tests were carried out at energy levels of 15 J, 20 J, 25 J, and 30 J. The full-field displacement of specimens during CAI was captured by three-dimensional digital image correlation (3D-DIC). In addition, how the damage morphology varies spatially due to the different deformation and damage modes is learned from X-ray micro-computed tomography (Micro-CT) techniques. The experimental results indicate that the S2-UACS specimen exhibits the most outstanding impact resistance. Based on the visualization characteristics of C/G hybrid laminates, it is observed that the delamination on the backside of the C/G hybrid laminates is improved by introducing discontinuous slits. The degree of LVI damage significantly affects the CAI damage tolerance of the laminates. After impact at energies from 15 to 30 J, the CAI strengths of the C/G hybrid laminates with the discontinuous fiber structure are 9.94 %, 25.61 %, 10.29 %, and 11.69 % higher, respectively, than those of the continuous carbon fiber laminates. Furthermore, micro-CT revealed that the introduction of slits restrains the occurrence of fiber buckling and delamination propagation in C/G hybrid laminates during the CAI test.

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基于薄层碳纤维预浸料和单向排列短切链的碳/玻璃纤维混杂复合材料层合板的低速冲击和冲击后压缩行为

抗冲击性能是轻质纤维增强聚合物复合材料最重要的力学性能之一，直接影响其在工程领域的应用。然而，由于纤维固有的脆性，强度与韧性的互斥成为玻璃钢设计的瓶颈之一。考虑到混杂结构和短纤维对提高玻璃钢复合材料伪延性的影响，本研究采用在薄层碳纤维预浸料中引入不连续裂缝制备短纤维结构，并与玻璃纤维预浸料混合制备碳/玻璃纤维混杂复合材料（C/G）。在15 J、20 J、25 J和30 J的能量水平下进行低速冲击（LVI）试验和冲击后压缩（CAI）试验，采用三维数字图像相关（3D-DIC）技术捕获试件在冲击后压缩过程中的全场位移。此外，通过x射线微计算机断层扫描（Micro-CT）技术了解了不同变形和损伤模式下损伤形态的空间变化规律。实验结果表明，S2-UACS试件的抗冲击性能最为突出。基于C/G杂化层合板的可视化特性，观察到通过引入不连续狭缝改善了C/G杂化层合板背面的分层现象。LVI损伤程度显著影响复合材料的CAI损伤容限。在15 ~ 30 J的能量冲击下，纤维结构不连续的C/G混杂层合板的CAI强度分别比连续碳纤维层合板高9.94%、25.61%、10.29%和11.69%。此外，微ct显示，在CAI测试过程中，裂缝的引入抑制了C/G混杂层合板中纤维屈曲和分层扩展的发生。

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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.