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PROCESS ZONE SIZE FAILURE CRITERION AND PROBABILISTIC FRACTURE ASSESSMENT CURVES FOR CERAMICS
Author(s) -
Ando K.,
Kim B. A.,
Iwasa M.,
Ogura N.
Publication year - 1992
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1992.tb00044.x
Subject(s) - fracture toughness , probabilistic logic , reliability (semiconductor) , fracture mechanics , materials science , ceramic , fracture (geology) , sensitivity (control systems) , reliability engineering , structural engineering , composite material , mathematics , engineering , statistics , thermodynamics , power (physics) , physics , electronic engineering
Abstract Data of fracture toughness and fracture stress of ceramics, generally show considerable size effects and scatter. This presents problems for the integrity of structural ceramics. Fracture mechanics test results on Si 3 N 4 and A1 2 O 3 reveal a sensitivity to crack size and the necessity to invoke probabilistic concepts to evaluate their integrity. A new failure criterion is proposed here, based on the existence of a crack‐tip process zone. A probabilistic failure assessment curve is also proposed to quantitatively evaluate reliability.