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Subcritical Crack Growth of Macrocracks in Alumina with R ‐Curve Behavior
Author(s) -
Fett Theo,
Munz Dietrich
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb04166.x
Subject(s) - materials science , crack growth resistance curve , crack closure , stress intensity factor , composite material , crack tip opening displacement , bending , paris' law , enhanced data rates for gsm evolution , shielding effect , fracture (geology) , fracture mechanics , electromagnetic shielding , telecommunications , computer science
Subcritical crack growth of macroscopic cracks in two Al 2 O 3 ceramics is investigated with single‐edge‐notched bending specimens under constant load. The resulting v ‐ K I ‐curves are in complete contrast to the behavior of natural cracks. In spite of the monotonic increase of the externally applied stress intensity factor due to crack extension, the crack growth rates first decrease. This behavior is caused by crack shielding due to crack border interaction and can be described by a rising crack growth resistance. Two methods are applied to determine the R ‐curve under subcritical crack growth conditions.