Stiffness of grain-bridging elements in a monolithic alumina

Journal Article · Thu May 01 00:00:00 EDT 1997 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1997.tb02980.x· OSTI ID:512066

Hay, J C; White, K W ^[1]

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1. Univ. of Houston, TX (United States). Dept. of Mechanical Engineering

The postfracture tensile (PFT) technique isolates the crack wake to characterize the mechanical behavior of the grain-bridging elements as a function of crack-opening displacement. Incorporating the PFT stiffnesses into a Hooke`s law-based model provides insight to the nature of the active bridging mechanism. The conventional model, which presumes to extract prismatic grains from sockets in the mating fracture face, is not consistent with the low wake stiffnesses presented here. In conjunction with fractographic evidence, such low wake stiffnesses suggest the strong influence from other, more compliant, mechanisms such as grain rotation, asperity loading, and ligament bending.

• Sponsoring Organization: USDOE
• OSTI ID: 512066
• Journal Information: Journal of the American Ceramic Society, Vol. 80, Issue 5; Other Information: PBD: May 1997
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
FRACTURE PROPERTIES
FLEXURAL STRENGTH
CRACK PROPAGATION
MATHEMATICAL MODELS
CERAMICS
HYSTERESIS
MICROSTRUCTURE
ELASTICITY