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Crack‐Propagation Rates in β″‐Alurnina
Author(s) -
VISWANATHAN LAKSHMINARAYAN,
VIRKAR ANIL V.
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.tb10007.x
Subject(s) - crack growth resistance curve , materials science , fracture mechanics , crack closure , crack tip opening displacement , composite material , bending
Specimens of sodium and silver β″‐alumina were electrolyLed for 3ariom times and subsequently broken in bending. Using the Griffith equation, the lengths of the cracks after electrolysis were estimated as a function of electroljsis time. It way obsened that the crack length vs time plots were bimodal. During the early Ytages of crack propagation, the crack velocity war found to he independent of crack length. The rate of crack propagation in Na‐β″‐alumina was about three times batter than that in Ag‐β″‐alumina. Furthermore, in Na‐β″‐alumina, the rate of crack propagation was found to increase with increasing temperature. The dependence of crack velocity on temperature, the difference in crack‐growth rates in Na‐β‐alumina and Ag‐β″‐alumina, and the fact that crack velocity is independent of crack length were rationalized in terms of a model that takes into account the transient nature of ionic flux to the growing crack.