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Sensing delamination in a carbon fiber polymer‐matrix composite during fatigue by electrical resistance measurement
Author(s) -
Wang Xiaojun,
Chung D. D. L.
Publication year - 1997
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.10322
Subject(s) - materials science , composite material , delamination (geology) , composite number , tension (geology) , electrical resistance and conductance , fiber pull out , stress (linguistics) , stress concentration , cyclic stress , matrix (chemical analysis) , fracture mechanics , compression (physics) , composite laminates , paleontology , linguistics , philosophy , tectonics , subduction , biology
Delamination in a crossply [0/90] continuous carbon fiber polymer‐matrix composite was sensed in real time during fatigue by measuring the electrical resistance of the composite in the through‐thickness direction. Upon 0° tension‐tension fatigue at a maximum stress of 57% of the fracture stress, the resistance irreversibly increased both in spurts and continuously, because of delamination, which started at 33% of the fatigue life. The resistance increased upon loading and decreased upon subsequent unloading in every cycle, thereby allowing strain sensing. The minimum resistance at the end of a cycle irreversibly increased during the first 0.1% of the fatigue life. The resistance became noisy starting at 62% of the fatigue life, at which delamination occurred rapidly and the fraction of laminate area delaminated reached 4.3%.
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