TY - GEN
T1 - Prediction of tensile strength of unidirectional carbon fiber/epoxy composites using the fragmentation test
AU - Watanabe, J.
AU - Tanaka, F.
AU - Higuchi, R.
AU - Matsutani, H.
AU - Okuda, H.
AU - Okabe, T.
N1 - Publisher Copyright:
© 2016, European Conference on Composite Materials, ECCM. All rights reserved.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2016
Y1 - 2016
N2 - The fiber breakage behavior of unidirectional polyacrylonitrile (PAN)-based carbon fiber/epoxy composite material was estimated, taking into account stress concentration in the adjacent fibers resulting from matrix cracking around fiber breakages. Analysis of the breakage behavior of adjacent fibers in double-fiber fragmentation tests showed that the results of simulation conducted using a spring element model and taking into account the stress concentration on the fiber surface corresponded well with experimental results. In addition to considering the stress concentration, it is essential to employ a bimodal Weibull distribution, which is a narrow strength distribution in the high strength-region, to explain the behavior observed in double-fiber fragmentation tests. When carbon fiber with no treatment and no sizing agent was used, matrix cracking around fiber breakages did not occur, and the tensile strength of unidirectional carbon fiber/epoxy composites was improved. These findings suggest that there is considerable potential for improving the tensile strength of composites by suppressing stress concentration on the fiber surface.
AB - The fiber breakage behavior of unidirectional polyacrylonitrile (PAN)-based carbon fiber/epoxy composite material was estimated, taking into account stress concentration in the adjacent fibers resulting from matrix cracking around fiber breakages. Analysis of the breakage behavior of adjacent fibers in double-fiber fragmentation tests showed that the results of simulation conducted using a spring element model and taking into account the stress concentration on the fiber surface corresponded well with experimental results. In addition to considering the stress concentration, it is essential to employ a bimodal Weibull distribution, which is a narrow strength distribution in the high strength-region, to explain the behavior observed in double-fiber fragmentation tests. When carbon fiber with no treatment and no sizing agent was used, matrix cracking around fiber breakages did not occur, and the tensile strength of unidirectional carbon fiber/epoxy composites was improved. These findings suggest that there is considerable potential for improving the tensile strength of composites by suppressing stress concentration on the fiber surface.
KW - Bimodal Weibull distribution
KW - Double-fiber fragmentation test
KW - Polyacrylonitrile-based carbon fiber
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M3 - Conference contribution
AN - SCOPUS:85018591924
T3 - ECCM 2016 - Proceeding of the 17th European Conference on Composite Materials
BT - ECCM 2016 - Proceeding of the 17th European Conference on Composite Materials
PB - European Conference on Composite Materials, ECCM
T2 - 17th European Conference on Composite Materials, ECCM 2016
Y2 - 26 June 2016 through 30 June 2016
ER -