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On the mode I delamination test and the importance of laminate lay‐ups
Author(s) -
Benzeggagh M. L.,
Gong X. J.,
Laksimi A.,
Roelandt J. M.
Publication year - 1991
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760311709
Subject(s) - materials science , delamination (geology) , epoxy , fiber pull out , composite material , strain energy release rate , curvature , fracture mechanics , structural engineering , composite laminates , geometry , composite number , paleontology , tectonics , mathematics , subduction , biology , engineering
The aim of this work has been the study of mode I delamination of multiply double cantilever beam specimens of glass fiber/epoxy. The results show an important influence of laminate lay‐ups on delamination resistance. The value of G Ic at the initiation of delamination varies with laminate curvature coupling K y / K x and K xy / K x . An empirical model describing this variation has been proposed. In addition, it is seen that the values of G Ic at the initiation of delamination and at stable crack growth will be very different. The delamination resistance can be characterized by two constants: G Ic corresponds to the initiation of delamination, and G S Ip corresponds to the plateau of stable crack propagation. The correlation between experimental measurement and analysis of compliance and energy release rate results reveals significant three‐dimensional effects.