TY - JOUR
T1 - A study of stress concentrations around fiber breaks in unidirectional CF/epoxy composites using double-fiber fragmentation tests
AU - Watanabe, J.
AU - Tanaka, F.
AU - Higuchi, R.
AU - Matsutani, H.
AU - Okuda, H.
AU - Okabe, T.
N1 - Publisher Copyright:
© 2018, © 2018 Japan Society for Composite Materials, Korean Society for Composite Materials and Informa UK Limited, trading as Taylor & Francis Group.
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2018/11/2
Y1 - 2018/11/2
N2 - The prediction of tensile strength of unidirectional CF/epoxy composites requires appropriately determining the tensile strength distribution of carbon fibers and calculating the stress concentrations around the fiber breaks. In this study, double-fiber fragmentation tests were performed to investigate the stress concentration factor in adjacent fibers around a broken fiber. Simulation results obtained by considering the additional stress concentration due to the matrix cracks correspond well with the fiber breakage behavior observed in experiments. Furthermore, using an additional stress concentration factor and a bimodal Weibull distribution, which has a narrow strength distribution at the short gauge length, the prediction of tensile strength of the unidirectional CF/epoxy composite exhibited a good agreement with experimental results. These results showed that double-fiber fragmentation tests are a valid means of estimating the stress concentrations around fiber breaks.
AB - The prediction of tensile strength of unidirectional CF/epoxy composites requires appropriately determining the tensile strength distribution of carbon fibers and calculating the stress concentrations around the fiber breaks. In this study, double-fiber fragmentation tests were performed to investigate the stress concentration factor in adjacent fibers around a broken fiber. Simulation results obtained by considering the additional stress concentration due to the matrix cracks correspond well with the fiber breakage behavior observed in experiments. Furthermore, using an additional stress concentration factor and a bimodal Weibull distribution, which has a narrow strength distribution at the short gauge length, the prediction of tensile strength of the unidirectional CF/epoxy composite exhibited a good agreement with experimental results. These results showed that double-fiber fragmentation tests are a valid means of estimating the stress concentrations around fiber breaks.
KW - bimodal Weibull distribution
KW - carbon fiber
KW - matrix crack
KW - stress concentration factor
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U2 - 10.1080/09243046.2017.1416567
DO - 10.1080/09243046.2017.1416567
M3 - Article
AN - SCOPUS:85038617843
VL - 27
SP - 575
EP - 587
JO - Advanced Composite Materials
JF - Advanced Composite Materials
SN - 0924-3046
IS - 6
ER -