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Strength of Zirconium Diboride Ceramics After Cyclic Loading or Heating
Author(s) -
STRAUSS ERIC L.,
KIEFER TED F.
Publication year - 1975
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.1151-2916.1975.tb19007.x
Subject(s) - materials science , flexural strength , temperature cycling , zirconium diboride , composite material , ceramic , coating , stress (linguistics) , cycling , thermal , linguistics , philosophy , physics , archaeology , meteorology , history
Strength losses in diboride ceramics resulting from load cycling near ultimate strength and from thermal cycling to 3000°F were investigated. Specimen configurations included notched and unnotched flexural specimens as well as specimens oriented in 3 orthogonal directions with respect to the billet pressing direction. Flexural fatigue testing for 2 to 8 million cycles produced no failures when stress levels were below 80% of flexural control strengths. Static loading of specimens that survived the fatigue test revealed no strength deterioration as a result of stress cycling. Thermal exposure produced an oxide coating; strength reductions caused by thermal cycling could be correlated with the thickness of this coating.