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Search Publications by: George D. Quinn (Assoc)

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Displaying 76 - 100 of 124

Machining Damage Cracks: How to Find and Characterize Them by Fractography

January 1, 2003
Author(s)
George D. Quinn, L K. Ives, S Jahanmir
Subsurface machining cracks may control strength and performance of finished ceramics. Previously, machining cracks had been though to be difficult or impossible to detect and characterize, especially in toughened ceramics with interlocking grain

Mechanical Testing for Ceramics

January 1, 2003
Author(s)
George D. Quinn
This article describes (briefly) the common tests used for strength testing of ceramics.

Weibull Strength Scaling for Standardized Rectangular Flexure Specimens

January 1, 2003
Author(s)
George D. Quinn
Formulas for the effective volumes and effective surfaces for rectangular bars loaded in flexure are reviewed. The ratio of strengths from any two configurations, such as 3-point flexural to 4-point, is independent of whether the flaws are volume or

Effect of Loading Rate Upon Conventional Ceramic Microindentation Hardness

June 1, 2002
Author(s)
George D. Quinn, P J. Patel, Isabel K. Lloyd
Dynamic micro-indentation hardness was evaluated for a steel, sintered silicon carbide, and an aluminum oxynitride. There was negligible effect upon Vickers hardness when loading rate was varied by almost three orders of magnitude.

The Fracture Toughness Round Robins in VAMAS: What We Have Learned

January 1, 2002
Author(s)
George D. Quinn
Over the last thirteen years the Versailles Advanced Materials and Standards (VAMAS) project has conducted five full fledged, international round robins on ceramic fracture toughness characterization. As many as forty laboratories have done thousands of

Comparisons of Calculated and Measured Flaw Sizes

October 1, 2001
Author(s)
George D. Quinn, J Swab
Fracture mechanics often is applied in fractographic analyses in order to verigy that the correct feature has been identified as the fracture origin. This step has been codified in ASTM Standard C1322-96, Standard Practice for the Characterization of

Fractographic Analysis of Machining Cracks in Silicon Nitride Rods and Bars

October 1, 2001
Author(s)
George D. Quinn, L K. Ives, S Jahanmir, P Koshy
A new fixture for flexural strength testing was used to evaluate the effects of machining on the flexural strength of a toughened sintered reaction-bonded silicon nitride. Different grinding procedures had various effects upon the flexure strength

Using X-Ray Topography to Study Fracture of Single-Crystal Ceramics

October 1, 2001
Author(s)
David R. Black, Robert S. Polvani, George D. Quinn
X-ray topography provides a unique view of the surfaces of single-crystal samples, both before and after fracture. The diffraction topograph, which is sensitive to local strain and/or crystallographic orientation, can be used to inspect samples prior to

Standard Reference Material 2100: Fracture Toughness of Ceramics

June 1, 2001
Author(s)
George D. Quinn, K Xu, R J. Gettings, J A. Salem, J Swab
New Standard Reference Material (SRM) 2100 is the first reference material in the world for the property fracture toughness for any class material. The SRM is for ceramic fracture toughness and may be used with any ceramic fracture toughness test method
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