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Tensile Fracture Strength of ST Cut Quartz
RAYTHEON CO LEXINGTON MA
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This paper discusses research made on the basic tensile fracture strength of quartz. It has been over 10 years since a value for the fracture strength of quartz approx. 14,000 psi was published and this number should be re-evaluated in light of the progress made in the technology of growing and polishing quartz. The major emphasis in this study was to compare the fracture strength of discs made out of four different types of quartz. These were natural growth and three synthetic grades optical, premium Q, and electronic. Since fracture strength often depends on surface finish, two different sample polishing techniques were used. The electro-mechanical Q of many of the quartz discs was also measured using infrared absorption techniques. The test method used for fracturing was the biaxial flexure test.
APPROVED FOR PUBLIC RELEASE