Fatigue resistance of ultra-high-modulus pitch-based carbon fiber/epoxy composites under tensile loading

Pitch-based carbon fiber reinforced epoxy composites are used in specialized applications for their high-modulus and thermal conductivity; however, little data on their fatigue performance are available in the open literature. In this study, fatigue behaviors of ultra-high-modulus pitch-based carbon fiber and standard-modulus polyacrylonitrile (PAN)-based carbon fiber were compared in woven quasi-isotropic epoxy matrix composites subject to uniaxial tension. It was found that the pitch fiber composite possessed higher normalized tensile fatigue strength and that its stress-life (S-N) curve is less steep. Extrapolation suggests the pitch fiber composite is more fatigue-resistant in higher cycle regimes (specifically, N >10^7). Cyclic loading of the pitch fiber composite resulted in minimal matrix damage, and the eventual fractures were localized and fiber-dominated for all stress levels. Cyclic loading of the PAN fiber composites resulted in widespread matrix cracking and delamination. The difference in fatigue behavior is attributed to the different strain levels attained at similar stress levels and the consequent difference in matrix damage development.

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Work Title Fatigue resistance of ultra-high-modulus pitch-based carbon fiber/epoxy composites under tensile loading
Access
Open Access
Creators
  1. Matthew Waller
  2. Charles E Bakis
  3. Kevin Koudela
Keyword
  1. ultra-high-modulus
  2. pitch-based carbon/epoxy
  3. fatigue
License In Copyright (Rights Reserved)
Work Type Article
Acknowledgments
  1. This research was partially funded by the U.S. Government under Agreement No. W911W6-17-2-0003.
Publisher
  1. SAGE/Journal of Composite Materials
Publication Date November 7, 2021
Subject
  1. Composite Materials
  2. Mechanical Testing
Language
  1. English
Publisher Identifier (DOI)
  1. 10.1177/00219983211055851
Related URLs
Deposited November 08, 2021

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Version 1
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  • Added Creator Matthew Waller
  • Added Creator Charles E Bakis
  • Added Creator Kevin Koudela
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    License
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  • Added PitchCarbonFatigue_WallerBakisKoudela_SubmissionVersion_V12_ScholarSphere.pdf
  • Updated Keyword, Subject, Language, and 3 more Show Changes
    Keyword
    • ultra-high-modulus, pitch-based carbon/epoxy, fatigue
    Subject
    • Composite Materials, Mechanical Testing
    Language
    • English
    Publisher
    • SAGE
    Acknowledgments
    • This research was partially funded by the U.S. Government under Agreement No. W911W6-17-2-0003.
    Related URLs
    • https://doi.org/10.1177/00219983211055851
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    • SAGE
    • SAGE, Journal of Composite Materials
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    • SAGE, Journal of Composite Materials
    • SAGE/Journal of Composite Materials
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    Publisher Identifier (DOI)
    • 10.1177/00219983211055851
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