Biaxial Fracture Behavior of Polycrystalline Alumina

Abstract:

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Fracture behavior under multiaxial stress state of polycrystalline alumina was studied from the view point of an artificial crack propagation and fracture from a natural flaw. The former was studied by mixed-mode fracture toughness tests; asymmetric four-point bending and diametral compression techniques were carried out using precracked and notched specimens. The latter was studied by biaxial fracture tests in compression and torsion loading; multiaxial fracture statistics was applied to the measured fracture envelope. The ratio KIIC/KIC obtained from the biaxial tests was higher than that obtained by the mixed-mode fracture toughness tests. It revealed that the fracture from an artificial flaw does not simulate the fracture from a naturall flaw in polycrystalline ceramics.

Info:

Periodical:

Materials Science Forum (Volumes 475-479)

Main Theme:

Edited by:

Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie

Pages:

1329-1332

DOI:

10.4028/www.scientific.net/MSF.475-479.1329

Citation:

M. Tsukada et al., "Biaxial Fracture Behavior of Polycrystalline Alumina", Materials Science Forum, Vols. 475-479, pp. 1329-1332, 2005

Online since:

January 2005

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Price:

$35.00

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