Mechanical properties of partially dense alumina produced from powder compacts

Journal Article · Mon Aug 01 04:00:00 EDT 1994 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1994.tb07105.x· OSTI ID:6988540

Lam, D C.C.; Lange, F F; Evans, A G ^[1]

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1. Univ. of California, Santa Barbara, CA (United States). Materials Dept.

The elastic modulus (E), the critical strain energy release rate (G[sub c]), and the flexural strength ([sigma]) have been determined for two partially dense alumina bodies produced from the same powder but with different initial densities. The mechanical properties were measured for specimens fabricated at four different relative densities. The measured elastic modulus, critical strain energy release rate, and a calculated critical stress intensity factor (K[sub c]) were observed to be linearly related to ([rho] [minus] [rho][sub 0])/(1 [minus] [rho][sub 0]), where [rho] is the current relative density and [rho][sub 0] is the initial relative density of the powder compact. With the observed linear relations for E, G[sub c] (or K[sub c]), and the assumption that the crack length responsible for failure was present in the initial powder compact and shrunk in proportion to the relative density change, a Griffith equation was constructed to estimate the strength at any relative density. This relation was in good agreement with measurements.

• OSTI ID: 6988540
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 77:8; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
COMPACTING
DATA
EXPERIMENTAL DATA
INFORMATION
MECHANICAL PROPERTIES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
POROSITY
YOUNG MODULUS