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Cyclic fatigue—crack growth along polymer/glass interfaces
Author(s) -
Ritter J. E.,
Grayeski W.,
Lardner T. J.
Publication year - 1996
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.10636
Subject(s) - materials science , composite material , paris' law , cyclic stress , glass transition , polymer , epoxy , growth rate , crack closure , monotonic function , fracture mechanics , mathematical analysis , geometry , mathematics
Delamination of polymer/glass interfaces was studied under cyclic and monotonic loading using an interfacial, four‐point flexure sandwich specimen. Specifically, crack growth rates along epoxy acrylate/glass interfaces were characterized over a range of velocities from 10 −9 to 10 −6 m/s as a function of low (10–20% RH) and high (75–80% RH) humidities. For low humidities, interfacial crack growth rates under cyclic loading are almost two orders of magnitude greater than those under monotonic loading with energy release rates G = G max of the cyclic loading. At high humidities, interfacial crack growth rates under monotonic loading are approximately equal to cyclic fatigue crack growth rates at low humidity.