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Crack‐Shape–Wake‐Area Effects on Ceramic Fracture Toughness and Strength
Author(s) -
Rice Roy W.
Publication year - 1994
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.1151-2916.1994.tb04627.x
Subject(s) - wake , fracture toughness , materials science , stress intensity factor , toughness , fracture mechanics , ceramic , crack growth resistance curve , composite material , crack closure , structural engineering , mechanics , engineering , physics
It is argued that, where crack wake‐area effects are a significant factor in the toughness of ceramics, the rate of change of wake area with crack growth normalized by the instantaneous wake area should be a factor in their mechanical behavior. Simple geometrical considerations show that differences in such wake area changes can vary by a factor of two or more for different test/crack geometries. This raises key questions regarding the (1) applicability of certain toughness tests for predicting strengths, (2) possible favoring of certain initial crack shapes or shape changes during failure, and (3) interaction with fracture mechanics, e.g., how stress intensity and such geometrical wake effects balance to control crack shape and failure.