Development in Carbon-Fiber-Reinforced Polymer Composites

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Composites and Nanocomposites".

Deadline for manuscript submissions: 5 November 2024 | Viewed by 2503

Special Issue Editor


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Guest Editor
School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China
Interests: composite failure; high-speed impact; interlaminar toughening

Special Issue Information

Dear Colleagues,

The widespread use of carbon-fiber-reinforced composite materials is a prominent feature of the structural design of aircraft. When an aircraft flies, its service environment is relatively complex, requiring the overall structure to have a certain ability to resist damp, heat, and impact loads. Therefore, the large-scale use of composite materials not only brings enormous benefits but also poses new challenges for the structural design and analysis of composite materials. The biggest problem faced by using composite laminates is their susceptibility to delamination when they are subjected to impact loads. The damage evolution between adjacent layers can lead to material stiffness and strength degradation, ultimately leading to catastrophic failure of composite structures. By introducing toughening phases represented by nanofibers between adjacent layers, the goal of inhibiting delamination can be achieved. To promote the industrial development of new composite laminates, it is necessary to comprehensively evaluate the interlayer fracture characteristics and structural reliability of toughened composite materials in extreme environments.

This Special Issue focuses on the mechanics of nanofiber toughening carbon-fiber-reinforced polymer composites towards extreme environments, especially high temperatures, extreme cold, humidity, and high strain rates. 

Dr. Yuan Li
Guest Editor

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Published Papers (2 papers)

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Research

15 pages, 6786 KiB  
Article
An Experimental Study on the Thermomechanical Coupling Effects of Carbon-Fiber-Reinforced Polyetheretherketone under Dynamic Impact
by Shuyan Nie, Liming Chen, Zhaoxin Yun, Jie Wang and Xin Pan
Polymers 2024, 16(16), 2295; https://doi.org/10.3390/polym16162295 - 14 Aug 2024
Viewed by 633
Abstract
Carbon-fiber-reinforced polyetheretherketone (CF/PEEK) composites are widely utilized in aerospace, medical devices, and automotive industries, renowned for their superior mechanical properties and high-temperature resistance. Despite these advantages, the thermomechanical coupling behavior of CF/PEEK under dynamic loading conditions is not well understood. This study aims [...] Read more.
Carbon-fiber-reinforced polyetheretherketone (CF/PEEK) composites are widely utilized in aerospace, medical devices, and automotive industries, renowned for their superior mechanical properties and high-temperature resistance. Despite these advantages, the thermomechanical coupling behavior of CF/PEEK under dynamic loading conditions is not well understood. This study aims to explore the thermomechanical coupling effects of CF/PEEK at elevated strain rates, employing Hopkinson bar impact tests and scanning electron microscopy (SEM) for detailed characterization. Our findings indicate that an increase in temperature led to significant reductions in the yield strength, peak stress, and specific energy absorption of CF/PEEK, while fracture strain had no significant effect. For instance, at 200 °C, the yield strength, peak stress, and specific energy absorption decreased by 39%, 37%, and 38%, respectively, compared to their values at 20 °C. Furthermore, as the strain rate increased, the yield strength, peak stress, specific energy absorption, and fracture strain all exhibited strain-hardening effects. However, as the strain rate further increased, above 4000 s−1, the enhancing effect of the strain rate on the yield strength and peak stress gradually diminished. The interaction of the temperature and strain rate significantly affected the mechanical performance of CF/PEEK under high-speed impact conditions. While the strain rate generally enhanced these properties, the strain-hardening effect on the yield strength weakened as the temperature increased, and both the temperature and strain rate contributed to the increase in specific energy absorption. Microdamage mechanism analysis revealed that interface debonding and sliding between the fibers and the matrix were more pronounced under static compression than under dynamic compression, thereby diminishing the efficiency of stress transfer. Additionally, higher temperatures caused the PEEK matrix to soften and exhibit increased viscoelastic behavior, which in turn affected the material’s toughness and the mechanisms of stress transfer. These insights hold substantial engineering significance, particularly for the optimization of CF/PEEK composite design and applications in extreme environments. Full article
(This article belongs to the Special Issue Development in Carbon-Fiber-Reinforced Polymer Composites)
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13 pages, 2004 KiB  
Article
Interfacial and Filler Size Effects on Mechanical/Thermal/Electrical Properties of CNTs-Reinforced Nanocomposites
by Jie Wang, Xinzhu Duan, Liangfei Gong and Shuyan Nie
Polymers 2024, 16(6), 808; https://doi.org/10.3390/polym16060808 - 14 Mar 2024
Cited by 2 | Viewed by 1339
Abstract
The mechanical/thermal/electrical properties on-demand design of CNTs-reinforced nanocomposites is a key scientific issue that limits the development of new-generation smart nanomaterials, and the establishment of a corresponding unified theoretical prediction model for the mechanical/thermal/electrical properties is the foundation of nanocomposites. Based on the [...] Read more.
The mechanical/thermal/electrical properties on-demand design of CNTs-reinforced nanocomposites is a key scientific issue that limits the development of new-generation smart nanomaterials, and the establishment of a corresponding unified theoretical prediction model for the mechanical/thermal/electrical properties is the foundation of nanocomposites. Based on the equivalent medium theory (EMT) obtained by Maxwell far-field matching, a unified mechanical/thermal/electrical modified EMT model is established by introducing Young’s modulus, thermal conductivity, and electrical conductivity to the thin filler–matrix’s interlayer. According to literature, the proposed model was employed to theoretically calculate the variations in the overall Young’s modulus, thermal conductivity, and electrical conductivity of CNTs-reinforced nanocomposites with respect to the volume concentration of CNT fillers. Then, the applicability of the proposed theoretical model was validated in comparison with the experimental measurements. Numerical calculations showed that the interface is a key factor affecting the mechanical/thermal/electrical properties of CNTs-reinforced nanocomposites, and strengthening the interfacial effect is an effective way to enhance the overall properties of nanocomposites. In addition, the aspect ratio of CNT fillers also significantly affects the material properties of the CNT fillers interface phase and the CNTs-reinforced nanocomposites. By fitting the experimental data, the calculation expressions of the aspect ratios of CNT fillers on the Young’s modulus, thermal conductivity, and electrical conductivity of the CNT fillers interfacial phase are quantitatively given, respectively. Full article
(This article belongs to the Special Issue Development in Carbon-Fiber-Reinforced Polymer Composites)
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