Two-step strategy for use in improving the multiscale mechanical performances of fiber metal laminates: Applying multi-walled carbon nanotubes and metal surface treatment

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering Pub Date : 2025-04-19 DOI:10.1016/j.compositesb.2025.112535

Hangyu He , Jifeng Xu , Kelei Pei , Yanan Su , Yongcun Li , Zhiqiang Li

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Abstract

The interlayer performances of fiber metal laminates (FMLs) significantly affect their applications. This study aims to design the interlayer properties of carbon fiber/ultra-thin stainless-steel FMLs (CUSFMLs) based on the fiber bridging and mechanical interlocking mechanism via a two-step modification strategy involving multi-walled carbon nanotube (MWCNT)-modified epoxy resin and metal surface treatment. This study combines short beam shear test and three-point bending tests, and uses digital image correlation to capture the strain field to explore the modification effects of the two methods in detail. Finite element analysis is conducted using ABAQUS/implicit modules to analyze the evolution of the delamination damage. The MWCNTs adhesive layer enhances the interlaminar shear strength of CUSFML by 16.4 % via the fiber bridging effect, enabling metals with high stiffnesses and excellent corrosion resistances to be more effective. In addition, the potassium dichromate (PD) method of metal surface treatment displays superior results compared to those observed using the silane coupling agent method. The flexural strength of the CUSFML is increased by 8.33 % and the contact angle between the epoxy resin and metal is decreased by 7.7 %. This improvement is because the metal treated using the PD method exhibits a larger surface roughness, which enables the epoxy resin to enter the grooves on the metal surface during curing, thus establishing a stronger mechanical interlocking effect.

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提高金属纤维层压板多尺度力学性能的两步策略：应用多壁碳纳米管和金属表面处理

金属纤维层压板的层间性能对其应用具有重要影响。本研究旨在通过多壁碳纳米管（MWCNT）改性环氧树脂和金属表面处理两步改性策略，设计基于纤维桥接和机械联锁机制的碳纤维/超薄不锈钢FMLs （CUSFMLs）的层间性能。本研究将短梁剪切试验和三点弯曲试验相结合，利用数字图像相关技术捕获应变场，详细探讨两种方法的修正效果。采用ABAQUS/隐式模块进行有限元分析，分析分层损伤的演化过程。MWCNTs粘合层通过纤维桥接效应使CUSFML的层间剪切强度提高16.4%，使具有高刚度和优异耐腐蚀性的金属更加有效。此外，重铬酸钾（PD）方法的金属表面处理效果优于硅烷偶联剂方法。CUSFML的抗折强度提高了8.33%，环氧树脂与金属的接触角减小了7.7%。这种改善是因为使用PD方法处理的金属具有更大的表面粗糙度，这使得环氧树脂在固化过程中能够进入金属表面的凹槽，从而建立更强的机械联锁效应。

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来源期刊

Composites Part B: Engineering 工程技术-材料科学：复合

CiteScore

24.40

自引率

11.50%

发文量

784

审稿时长

21 days

期刊介绍： Composites Part B: Engineering is a journal that publishes impactful research of high quality on composite materials. This research is supported by fundamental mechanics and materials science and engineering approaches. The targeted research can cover a wide range of length scales, ranging from nano to micro and meso, and even to the full product and structure level. The journal specifically focuses on engineering applications that involve high performance composites. These applications can range from low volume and high cost to high volume and low cost composite development. The main goal of the journal is to provide a platform for the prompt publication of original and high quality research. The emphasis is on design, development, modeling, validation, and manufacturing of engineering details and concepts. The journal welcomes both basic research papers and proposals for review articles. Authors are encouraged to address challenges across various application areas. These areas include, but are not limited to, aerospace, automotive, and other surface transportation. The journal also covers energy-related applications, with a focus on renewable energy. Other application areas include infrastructure, off-shore and maritime projects, health care technology, and recreational products.