Influence of microcrystalline structure on compressive failure of carbon fiber

IF 5.5 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Carbon Letters Pub Date : 2024-07-09 DOI:10.1007/s42823-024-00768-4

Yang Zhang, Ruoyan Wang, Heng Zhang, Yuanjian Tong, Yu Wang

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Abstract

Carbon fibers (CFs) with different tensile moduli of 280–384 GPa were applied to investigate the relationship between crystalline structure and compressive failure. The carbon chemical structure and crystalline structure were studied by Raman, high-resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD). The correlation between compressive strength and crystalline structure was investigated. The results showed that the transition point between medium and high tensile modulus was around 310 GPa, and within the range of medium modulus, the compressive strength of CFs improved with the increase of tensile modulus, and the compressive strength also improved with the increase of crystal thickness Lc, crystal width La, and crystal plane orientation; In the high modulus range, the correlation law was opposite, which was mainly influenced by the grain boundary structure. CFs with tensile modulus lower than 310 GPa exhibited bucking and kinking fracture under compressive loading, while shear fracture was observed for CFs with tensile modulus higher than 310 GPa.

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微晶结构对碳纤维压缩失效的影响

应用不同拉伸模量（280-384 GPa）的碳纤维（CFs）研究晶体结构与抗压破坏之间的关系。通过拉曼、高分辨率透射电子显微镜（HRTEM）和 X 射线衍射（XRD）对碳化学结构和晶体结构进行了研究。研究了抗压强度与晶体结构之间的相关性。结果表明，中、高拉伸模量之间的转变点在 310 GPa 左右，在中模量范围内，CFs 的抗压强度随拉伸模量的增加而提高，抗压强度也随晶体厚度 Lc、晶体宽度 La 和晶面取向的增加而提高；在高模量范围内，相关规律相反，主要受晶界结构的影响。拉伸模量低于 310 GPa 的 CF 在压缩载荷下表现出屈曲和扭结断裂，而拉伸模量高于 310 GPa 的 CF 则表现出剪切断裂。

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来源期刊

Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

7.30

自引率

20.00%

发文量

118

期刊介绍： Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.

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