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説明:

Fibers used in fiber-reinforced polymer matrix composites (FRPs) exhibit significant anisotropy between radial and axial directions. In this study, six epoxy composites containing different fiber types—E-glass, aramid, and carbon fibers—were prepared. Nanoindentation tests were conducted on three orthogonal cross-sections of each fiber. The Vlassak–Nix (VN) model, based on theoretical implicit equations derived from anisotropic elasticity theory, was applied to extract five independent elastic constants: c11, c12, c13, c33, and c44. The anisotropic index and its correlation with tensile modulus and extrapolated indentation modulus were systematically evaluated. Results revealed that fibers with higher stiffness exhibited greater anisotropy. These findings highlight the importance of considering both anisotropy and stiffness in fiber selection for composites and additive manufacturing applications.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Fiber, Polymer-matrix composites (PMCs), Nanoindentation, Anisotropy, Elastic constants

刊行年月日: 2026-01-31

出版者: Elsevier BV

掲載誌:

• Journal of Materials Research and Technology (ISSN: 22140697) vol. 41

研究助成金:

• Japan Science and Technology Agency JPMJKP 24W1

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1016/j.jmrt.2026.01.225

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更新時刻: 2026-02-16 18:09:32 +0900

MDRでの公開時刻: 2026-02-04 13:58:36 +0900