High-temperature bridging in a vitreous bonded alumina

Journal Article · Sat Feb 01 04:00:00 EST 1997 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1997.tb02860.x· OSTI ID:483675

Webb, J E; Jakus, K; Ritter, J E ^[1]

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1. Univ. of Massachusetts, Amherst, MA (United States). Dept. of Mechanical Engineering

The load supported by crack wake bridges was studied in glassy alumina at 1,240 C using short double cantilever beam specimens with a rear notch wedge. Direct observation of fracture surfaces revealed the sizes and shapes of the high-temperature bridges. The bridged area was stochastic in nature but there was a clear trend toward decreased area bridged with increasing crack opening displacement consistent with existing models. Fracture surface observations on specimens without a rear notch were compared to bridge distributions in wedged specimens. Because of the complex bridge morphology the load supported by the bridges cannot be modeled as viscous uniaxial columns.

• Sponsoring Organization: USDOE
• OSTI ID: 483675
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 2 Vol. 80; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
BINDERS
CRACK PROPAGATION
FRACTOGRAPHY
FRACTURE MECHANICS
FRACTURE PROPERTIES
GLASS
MORPHOLOGY
NOTCHES