Effects of residual stresses on fracture from controlled surface flaws

Conference · Wed Dec 31 23:00:00 EST 1975 · J. Am. Ceram. Soc.; (United States)

OSTI ID:7290304

Petrovic, J J ^[1]; Dirks, R A; Jacobson, L A; Mendiratta, M G

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1. Metallurgy and Ceramics Research Lab., Wright-Patterson AFB, Dayton, OH

RFracture tests were conducted on surface flawed Si/sub 3/N/sub 4/ bend specimens as function of surface removal. Results show that residual stresses at the Knoop microhardness indentation affect fracture of the controlled surface flaw beneath the indentation. Annealing was found to heal surface flaws and because of this, the relative contribution of residual stresses to the effects of annealing on the critical stress intensity factor in Si/sub 3/N/sub 4/ could not be assessed. (JRD)

• OSTI ID: 7290304
• Journal Information: J. Am. Ceram. Soc.; (United States), Journal Name: J. Am. Ceram. Soc.; (United States) Vol. 59:3-4; ISSN JACTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ANNEALING
DEFECTS
FRACTURE PROPERTIES
HEAT TREATMENTS
KNOOP HARDNESS
MECHANICAL PROPERTIES
NITRIDES
NITROGEN COMPOUNDS
PNICTIDES
RESIDUAL STRESSES
SILICON COMPOUNDS
SILICON NITRIDES
STRESSES