Chevron-notched toughness of materials with rising fracture resistance curves

Journal Article · Thu May 01 04:00:00 EDT 1997 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1997.tb02987.x· OSTI ID:512070

Zehnder, A T; Hui, C Y; Rodeghiero, E D ^[1]

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1. Cornell Univ., Ithaca, NY (United States)

The effect of rising resistance curves on the fracture toughness determined from chevron-notched beam tests is estimated via a set of simple numerical calculations. It is shown that for materials with a rising resistance curve, the toughnesses determined by the peak load method and by the work of fracture method are both higher than the initiation toughness, and both depend on the sample size relative to the length over which the resistance curve increases. It is also found that the toughness based on the work of fracture is higher than that based on the peak load. Fracture toughness data obtained from tests of a nickel-alumina composite are discussed in light of the results of the numerical calculation.

• Sponsoring Organization: Department of the Air Force, Washington, DC (United States)
• OSTI ID: 512070
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 5 Vol. 80; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
CALCULATION METHODS
COMPOSITE MATERIALS
FRACTURE PROPERTIES
MECHANICAL TESTS
NICKEL
NOTCHES