Journal Published Online: 01 May 1980
Volume 8, Issue 3

Performance of Chevron-Notch Short Bar Specimen in Determining the Fracture Toughness of Silicon Nitride and Aluminum Oxide

CODEN: JTEVAB

Abstract

Ease of preparation and testing are advantages unique to the chevron-notch specimen used for the determination of the plane strain fracture toughness of extremely brittle materials. During testing, a crack develops at the notch tip and extends stably as the load is increased. For a given specimen and notch configuration, maximum load always occurs at the same relative crack length independent of the material. Fracture toughness is determined from the maximum load with no need for crack length measurement. Chevron notch acuity is relatively unimportant since a crack is produced during specimen loading. In this paper, the authors use their previously determined stress intensity factor relationship for the chevron-notch short bar specimen to examine the performance of that specimen in determining the plane strain fracture toughness of silicon nitride and aluminum oxide.

Author Information

Munz, D
German Aerospace Research Establishment (DFVLR), Cologne, Federal Republic of Germany
Bubsey, RT
National Aeronautics and Space Administration, Lewis Research Center, Strength of Materials Section, Cleveland, Ohio
Shannon, JL
National Aeronautics and Space Administration, Lewis Research Center, Strength of Materials Section, Cleveland, Ohio
Pages: 5
Price: $25.00
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Stock #: JTE10605J
ISSN: 0090-3973
DOI: 10.1520/JTE10605J