Biaxial Fracture Behavior of Polycrystalline Alumina

Masayuki Tsukada; Eiichi Sato; Kazuhiko Kuribayashi

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

Paper Titles

Origin, Transformation and Control of the Inner Stress in the Green Bodies Prepared by Ceramic Colloidal Forming Processing
p.1313

Study on Elimination of Surface-Exfoliation and Crack of ZrO₂ Green Body of Gelcasting with Water-Solubility Macromolecule
p.1317

Pretreatment Processing of Gelcast Green Body before Debinding
p.1321

Controllable Forming Technology in Gelcasting
p.1325

Biaxial Fracture Behavior of Polycrystalline Alumina
p.1329

Tensile Properties and Creep Behavior of SiC-Based Fibers under Various Oxygen Partial Pressures
p.1333

Microstructure and Electrode Discharge Machining of TiN/Si₃N₄ Composites
p.1337

Studies of Damage Accumulation in 4H Silicon Carbide by Ion-Channeling Techniques
p.1341

Defects and Ion-Solid Interactions in Silicon Carbide
p.1345

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Biaxial Fracture Behavior of Polycrystalline Alumina

Abstract:

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.