Creep damage development in structural ceramics

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1993.tb05301.x· OSTI ID:6254550

Chan, K S; Page, R A ^[1]

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1. Southwest Research Inst., San Antonio, TX (United States)

Creep rupture of structural ceramics occurs by either the nucleation, growth, and coalescence of grain-boundary cavities throughout the material or the growth of a dominant flaw. Recent experimental results obtained with small-angle neutron scattering (SANS) and stereo imaging strain analysis are reviewed and used to answer a number of critical questions pertaining to both damage mechanisms. The nucleation and growth processes of grain-boundary cavities are examined using the SANS results and pertinent results from other studies. The stochastic nature of cavitation is demonstrated and discussed. Creep-crack growth is described as either a direct mass transport process or a damage zone growth process. New stereo imaging strain results pertinent to the damage zone growth process are presented and used to elucidate the crack growth process and the growth threshold.

• OSTI ID: 6254550
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 76:4; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
CERAMICS
CRACK PROPAGATION
CREEP
DEFECTS
FAILURES
FRACTURE PROPERTIES
GRAIN BOUNDARIES
GRAIN GROWTH
MECHANICAL PROPERTIES
MICROSTRUCTURE
RUPTURES
SCATTERING
SMALL ANGLE SCATTERING
STOCHASTIC PROCESSES