A novel mechanical test has been developed to measure the fracture toughness of the silicon-nitride balls used in modern hybrid bearings important for many defense, space and industrial applications. The ball is compressed diametrally between two hemispherical conforming dies, which causes the ball’s equator to bulge, generating a tensile hoop stress. Under applied load, a precrack placed at the equator grows. To calculate the ball’s fracture toughness at crack instability, finite element calculations of the applied stress field and an analytical solution for the stress intensity factor are used in the “two point plus semiellipse” method. The new technique appears more accurate than the indentation technique used to measure the toughness of ceramics.
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World Tribology Congress III
September 12–16, 2005
Washington, D.C., USA
Conference Sponsors:
- Tribology Division
ISBN:
0-7918-4202-9
PROCEEDINGS PAPER
A Novel Test Method to Measure the Fracture Toughness of Ceramic Balls Used in Bearings
Michael O’Brien
Michael O’Brien
The Aerospace Corporation, Los Angeles, CA
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Michael O’Brien
The Aerospace Corporation, Los Angeles, CA
Paper No:
WTC2005-64189, pp. 173-174; 2 pages
Published Online:
November 17, 2008
Citation
O’Brien, M. "A Novel Test Method to Measure the Fracture Toughness of Ceramic Balls Used in Bearings." Proceedings of the World Tribology Congress III. World Tribology Congress III, Volume 2. Washington, D.C., USA. September 12–16, 2005. pp. 173-174. ASME. https://doi.org/10.1115/WTC2005-64189
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