Improved Bar Impact Tests Using A Photonic Doppler Velocimeter




Bless, S. J.
Tolman, J.
Levinson, S.
Nguyen, J.

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Bar impact tests, using the techniques described elsewhere in this symposium, were used to measure compressive and tensile strengths of borosilicate glass, soda lime glass, and a glass ceramic. The glass ceramic was 25% crystalline spinel, furnished by Corning Inc. There are two measures of compressive strength: the peak stress that can be transmitted in unconfined compression, and the >steady state> strength. For borosilicate glass and soda lime glass, these values were similar, being about 1.8 and 1.5 GPa, respectively. The glass ceramic (25% spinel) was almost 50% stronger. Tensile failure in the glass and glass ceramic takes places via surface flaws, and thus tensile strength is an extrinsic, as opposed to intrinsic property.


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S. J. Bless, J. Tolman, S. Levinson, and J. Nguyen. AIP Conference Proceedings 1195, 615 (Dec., 2009); doi: 10.1063/1.3295213