TY - JOUR
T1 - Tensile-strength-controlling factors in unidirectional carbon fiber reinforced plastic composites
AU - Yamamoto, Go
AU - Koizumi, Keita
AU - Nakamura, Takahiro
AU - Hirano, Noriyuki
AU - Okabe, Tomonaga
N1 - Funding Information:
The authors thank Prof. T. Hashida and Mr. T. Suzuki of the Fracture and Reliability Research Institute, Tohoku University, for technical assistance in the fracture toughness measurements. This work was partly supported by Toray Industries, Inc., the Council for Science, Technology and Innovation (CSTI), Cross-ministerial Strategic Innovation Promotion Program (SIP), and JSPS KAKENHI [grant number 18K04721]. We would like to thank Editage for English language editing.
Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2021/1
Y1 - 2021/1
N2 - Factors governing the tensile strength of unidirectional carbon fiber reinforced plastic (CFRP) composites were experimentally investigated by focusing on the mechanical characteristics of the epoxy matrix. Correlation analysis was conducted to reveal the mechanical characteristics of the matrix that affect the surface stress concentration of an intact fiber caused by a fracture site in an adjacent fiber. The stress concentration factors (SCFs) were evaluated by implementing double-fiber fragmentation tests in conjunction with spring element model simulations. From investigating six types of epoxy materials, a reasonable correlation was observed between the matrix crack tip opening displacement (CTOD) and the SCF; the SCF increased approximately linearly with increasing CTOD. The results reported here suggest that CTOD is one of the important tensile-strength-controlling factors to consider for the development of stronger CFRP composites.
AB - Factors governing the tensile strength of unidirectional carbon fiber reinforced plastic (CFRP) composites were experimentally investigated by focusing on the mechanical characteristics of the epoxy matrix. Correlation analysis was conducted to reveal the mechanical characteristics of the matrix that affect the surface stress concentration of an intact fiber caused by a fracture site in an adjacent fiber. The stress concentration factors (SCFs) were evaluated by implementing double-fiber fragmentation tests in conjunction with spring element model simulations. From investigating six types of epoxy materials, a reasonable correlation was observed between the matrix crack tip opening displacement (CTOD) and the SCF; the SCF increased approximately linearly with increasing CTOD. The results reported here suggest that CTOD is one of the important tensile-strength-controlling factors to consider for the development of stronger CFRP composites.
KW - A. Polymer-matrix composites (PMCs)
KW - B. Mechanical properties
KW - B. Stress concentrations
KW - Crack tip opening displacement (CTOD)
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U2 - 10.1016/j.compositesa.2020.106140
DO - 10.1016/j.compositesa.2020.106140
M3 - Article
AN - SCOPUS:85092894883
SN - 1359-835X
VL - 140
JO - Composites Part A: Applied Science and Manufacturing
JF - Composites Part A: Applied Science and Manufacturing
M1 - 106140
ER -