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Mechanics of Transformation‐Toughening in Brittle Materials
Author(s) -
McMEEKING R. M.,
EVANS A.G.
Publication year - 1982
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.1151-2916.1982.tb10426.x
Subject(s) - materials science , stress intensity factor , brittleness , toughness , composite material , fracture mechanics , fracture toughness , toughening , crack closure , residual stress , diffusionless transformation , stress (linguistics) , transformation (genetics) , crack growth resistance curve , intensity (physics) , martensite , forensic engineering , microstructure , optics , linguistics , philosophy , biochemistry , chemistry , physics , gene , engineering
Particles which undergo a stress‐induced martensitic transformation are known to toughen certain brittle materials. The enhanced toughness can be considered to originate from the residual strain fields which develop following transformation and tend to limit the crack opening. The increased toughness can estimated from the crack‐tip stress‐intensity change induced by the transformation of a volume of material near the crack tip. It is found that the initial zone, prior to crackgrowth, provides no change in stress intensity. As the crack grows, the zone (associated with a positive transformation strain) induces a stress‐intensity reduction that rises to a maximum level after some crack propagation. The influence of particle‐size distribution on the stress‐intensity reduction is also discussed.