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Search Publications by: George D. Quinn (Assoc)

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Displaying 51 - 75 of 124

Machining Cracks in Finished Ceramics

May 16, 2005
Author(s)
George D. Quinn, L K. Ives, S Jahanmir
Well prepared strength test specimens and components break from a material s inherent flaws and machining damage has no effect on strength. On the other hand, grinding can create machining flaws that control strength and limit the performance of finished

Fracture Mirrors in a Nanoscale 3Y-TZP

March 1, 2004
Author(s)
George D. Quinn, J Eichler, U Eisele, J Rodel
The strengths of fine microstructural scale yttria stabilized rectangular bars and circular disks were measured by four-point flexure and by flat ball (piston) on three ball methods. Fracture mirror sizes were measured and correlated to the strengths

Machining Cracks Revealed by Fractography

August 28, 2003
Author(s)
George D. Quinn, L K. Ives, S Jahanmir
Fractography detected and characterized the nature and size of strength limiting rods and bars in a sintered reaction bonder silicon nitride that was ground by a variety of procedures.

Fracture Toughness of Toughened Silicon Nitride by ASTM C 1421

June 1, 2003
Author(s)
George D. Quinn, J Swab, M J. Motyka
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

Cracking and the Indentation Size Effect for Knoop Hardness of Glasses

March 1, 2003
Author(s)
George D. Quinn, P Green, K Xu
The Knoop Hardness of five glasses as measured over a wide range of indentation loads. Hardness decreased with increasing load in accordance with the classic indentation size effect (ISE). At moderate loads, cracking dramatically altered the indentation