Fracture toughness evaluation of small thin ceramic specimens

Journal Article · Tue Jul 01 04:00:00 EDT 1997 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1997.tb03071.x· OSTI ID:529549

Sherman, D ^[1]

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1. Technion-Israel Inst. of Tech., Haifa (Israel). Dept. of Materials Engineering

A test method to evaluate the fracture toughness, K{sub IC}, of thin, small, precracked ceramic specimens is described. The method is applicable for thin plates, wafers, self-supported layers, etc., especially when a large amount of material is not available for testing. The method consists of bonding a small, thin single-edge notched beam on one side of a metallic beam. A stress-free precrack with a square root singularity is achieved when the assembly is deformed in three-point bending. The fracture toughness of a thin, alumina single-edge precracked beam was evaluated experimentally using this method, and compared with that obtained for similar specimens having a 0.3-mm-wide machined notch. Comparison with previously reported fracture toughness values suggests that even a very sharp machined notch overestimates the evaluated fracture toughness.

• Sponsoring Organization: USDOE
• OSTI ID: 529549
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 7 Vol. 80; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
BENDING
CERAMICS
CORRELATIONS
CRACK PROPAGATION
CRACKS
FRACTURE MECHANICS
FRACTURE PROPERTIES
LAYERS
NOTCHES
STRESSES