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Residual‐Stress–Defect‐Severity Relationships in Ceramics
Author(s) -
Sung Jason,
Nicholson Patrick S.
Publication year - 1990
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.1151-2916.1990.tb05198.x
Subject(s) - materials science , residual stress , composite material , tetragonal crystal system , sintering , ceramic , agglomerate , fracture (geology) , cubic zirconia , residual , stress relaxation , stress (linguistics) , elastic modulus , relaxation (psychology) , modulus , crystallography , crystal structure , creep , psychology , social psychology , linguistics , chemistry , philosophy , algorithm , computer science
Equivalent‐sized fracture‐origin defects in partially stabilized zirconia ceramics show dissimilar behavior in initiating fracture. It is suggested that the difference of relative defect severity is related to local residual stresses which develop during sintering and cooling and to elastic modulus differences in the case of solid inclusions on external loading. The existence of residual stresses associated with various defect types is demonstrated, and their variation with temperature is explored. The relative severity of α‐alumina defects in tetragonal zirconia varies with temperature, and it is suggested that this is associated with matrix compressive stress relaxation. The residual stress associated with agglomerate defects is temperature independent, and no residual stress is associated with pores.