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Fatigue crack retardation in polycarbonate
Author(s) -
Banasiak D. H.,
Grandt A. F.,
Montulli L. T.
Publication year - 1977
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1977.070210513
Subject(s) - polycarbonate , materials science , crack closure , paris' law , composite material , ultimate tensile strength , stress intensity factor , stress concentration , crack growth resistance curve , fracture mechanics
Results are presented from a recent study of the influence of tensile overloads on fatigue crack growth in polycarbonate. Fatigue cracks were grown under conditions of constant range in stress intensity factor in four‐point bend specimens. The data presented here indicate that tensile overloads may significantly retard subsequent fatigue crack growth in polycarbonate. The period of delay in crack growth was shown to increase with the magnitude of the overload. Recovery of stable crack extension following the overload appeared to involve reinitiation of separate crack growth sites at the tip of the blunted crack tip, similar to the original crack initiation at sharp V‐notches.