Toughening mechanisms of structural ceramics

Toughening mechanisms in polycrystalline ceramics were discussed based on Griffith's energy equilibrium. These mechanisms were classified into three groups: (1) The frontal process-zone toughening mechanism, which is related to the intrinsic fracture energy of a material, and creates a damaged...

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Published inNihon Seramikkusu Kyōkai gakujutsu ronbunshi Vol. 108; no. 6; pp. 611 - 613
Main Authors AWAJI, H, CHOI, S.-M, EBISUDANI, T, JAYASEELAN, D. D
Format Journal Article
LanguageJapanese
Published Tokyo Nippon seramikkusu kyokai 01.06.2000
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Summary:Toughening mechanisms in polycrystalline ceramics were discussed based on Griffith's energy equilibrium. These mechanisms were classified into three groups: (1) The frontal process-zone toughening mechanism, which is related to the intrinsic fracture energy of a material, and creates a damaged zone ahead of the crack tip. This mechanism generates intrinsic fracture toughness in a material. (2) The crack-surface-bridging mechanism, which is caused by stress shielding, resulting from bridging and/or interlocking in a process-zone wake, and creates an extrinsic increase in crack resistance. (3) The macroscopic crack deflection mechanism, in which the crack deflection decreases the energy-release rate and, consequently, the stress-intensity factor at the crack tip, thus apparently enhancing the fracture toughness.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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ISSN:0914-5400
DOI:10.2109/jcersj.108.1258_611