NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.
Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.
An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Fracture Toughness of Toughened Silicon Nitride by ASTM C 1421
Published
Author(s)
George D. Quinn, J Swab, M J. Motyka
Abstract
The fracture toughness of a commercial sintered reaction-bonded silicon nitride was measured by the three complementary test methods in ASTM C 1421. Precracks ranged from tiny artificial flaws introduced by Knoop indentation to millimeter long precracks in single-edge precracked beams. Although this material probably has a rising R-curve, the fracture values from the three methods were in good agreement.
Citation
Journal of the American Ceramic Society
Volume
86
Issue
No. 6
Pub Type
Journals
Keywords
ASTM C 1421, chevron notch beam, fracture toughness, reference material, silicon nitride, silicon-edge precracked beam, surface crack in flexure
Quinn, G.
, Swab, J.
and Motyka, M.
(2003),
Fracture Toughness of Toughened Silicon Nitride by ASTM C 1421, Journal of the American Ceramic Society
(Accessed October 10, 2025)