Journal
ENGINEERING FRACTURE MECHANICS
Volume 77, Issue 8, Pages 1348-1359Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2010.02.019
Keywords
Fracture mechanics; Microstructure; Dislocations; Viscoplasticity; Nuclear pressure vessel steels; Grain size; Cleavage; Ductile-brittle transition; Brittleness; WC-Co composites; Hardness
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Dislocation viscoplasticity, whether occurring before, during, or after the appearance of cracking, and with energy requirement additional to needed crack surface energy, has proved to be the bane of simplistic strength/energy evaluations applied to the fracturing properties of solid materials. George Irwin, in later years, turned his attention to such crack-effected viscoplasticity consideration in relation to the complex microstructural aspects of fracturing behaviors obtained for nuclear pressure vessel steels. The work is reviewed here with a broader research focus on dislocation plasticity aspects of fracturing behaviors, at ever smaller crack sizes, for a wider range of materials, especially, of relatively greater hardness. (C) 2010 Elsevier Ltd. All rights reserved.
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