TY - JOUR
T1 - Considering the stress concentration of fiber surfaces in the prediction of the tensile strength of unidirectional carbon fiber-reinforced plastic composites
AU - Yamamoto, Go
AU - Onodera, Miho
AU - Koizumi, Keita
AU - Watanabe, Jun
AU - Okuda, Haruki
AU - Tanaka, Fumihiko
AU - Okabe, Tomonaga
N1 - Funding Information:
The authors thank Mr. W. Shoichiro of the Department of Aerospace Engineering, Tohoku University, and Dr. R. Higuchi of the Department of Aeronautics and Astronautics, The University of Tokyo, for technical assistance in the FEM analysis. This work was partly supported by Toray Industries, Inc., Japan , the Council for Science, Technology and Innovation (CSTI), Japan , the Cross-ministerial Strategic Innovation Promotion Program (SIP), Japan , and JSPS KAKENHI grant number 18K04721 . The authors would like to thank the reviewers for their useful comments and recommendations. The authors would like to acknowledge the vitally important encouragement and support made through the University of Washington-Tohoku University: Academic Open Space (UW-TU: AOS). The authors would like to thank Editage ( www.editage.jp ) for the English language editing.
Publisher Copyright:
© 2019
PY - 2019/6
Y1 - 2019/6
N2 - The tensile strengths of unidirectional carbon fiber-reinforced plastic (CFRP) were predicted by using a spring element model that considers the surface stress concentration on fibers caused by a fracture site in an adjacent fiber. The surface stress concentration on the fibers was experimentally evaluated by implementing multi-fiber fragmentation tests in conjunction with a spring element model simulation. Four types of epoxy materials were utilized to explore the effects of matrix polymer properties on the surface stress concentration of the fibers. The size scaling results, coupled with the results of the spring element model simulation, designed to take into account the surface stress concentration, were reasonably consistent with the experimental data on the tensile strengths of the unidirectional CFRP composites, regardless of the differences in the matrix mechanical properties. Possible mechanisms by which additional stress concentration is generated on an intact fiber surface were analyzed numerically using the finite element method.
AB - The tensile strengths of unidirectional carbon fiber-reinforced plastic (CFRP) were predicted by using a spring element model that considers the surface stress concentration on fibers caused by a fracture site in an adjacent fiber. The surface stress concentration on the fibers was experimentally evaluated by implementing multi-fiber fragmentation tests in conjunction with a spring element model simulation. Four types of epoxy materials were utilized to explore the effects of matrix polymer properties on the surface stress concentration of the fibers. The size scaling results, coupled with the results of the spring element model simulation, designed to take into account the surface stress concentration, were reasonably consistent with the experimental data on the tensile strengths of the unidirectional CFRP composites, regardless of the differences in the matrix mechanical properties. Possible mechanisms by which additional stress concentration is generated on an intact fiber surface were analyzed numerically using the finite element method.
KW - A. Polymer-matrix composites (PMCs)
KW - B. Fragmentation
KW - B. Strength
KW - B. Stress concentrations
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U2 - 10.1016/j.compositesa.2019.04.011
DO - 10.1016/j.compositesa.2019.04.011
M3 - Article
AN - SCOPUS:85064265614
SN - 1359-835X
VL - 121
SP - 499
EP - 509
JO - Composites - Part A: Applied Science and Manufacturing
JF - Composites - Part A: Applied Science and Manufacturing
ER -