Premium
Static Fatigue of Silica in Hermetic Environments
Author(s) -
Wysocki J. A.
Publication year - 1983
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.1151-2916.1983.tb10028.x
Subject(s) - materials science , composite material , paris' law , metal , coating , fiber , stress (linguistics) , crack closure , stress concentration , structural engineering , fracture mechanics , metallurgy , engineering , linguistics , philosophy
Static fatigue tests on metal‐coated silica fibers have shown subcritical crack growth with crack velocities ranging from ∼10 −14 to 10 −17 m.s −1 . To induce subcritical crack growth, however, it is necessary that the test be performed at stress intensities, K I , of >0.8 K IC . Metal‐coated fibers provide a unique medium for studying static fatigue at these high stress levels because the metal coating protects the fiber from the external environment. Crack growth,for these tests demonstrates the sensitivity of crack velocity to OH − concentrations at the crack site.