14 September 2011 ZERODUR: new results on bending strength and stress corrosion
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Abstract
ZERODUR® strength data and information are required for the design of structures, which will be subject to mechanical loads throughout their lifetime or at least during some periods thereof such as lightweight mirrors for space telescopes. Comparison of data acquired twenty years ago with recent ones show astonishing reproducibility. An influence of the specimen preparation process on the width of the breakage stress distribution generally leading to higher values has been observed. New data are available for diamond grain D25 fine ground surface condition. The stress corrosion coefficient, an important parameter needed to calculate the long time behavior of structures subject to tensile stress in their surface has been determined from breakage data sets obtained with different stress load increase rates. Conditioning of ZERODUR® specimen with stress free storage under varying humidity and humidity exposure times has shown no influence on strength.
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Peter Hartmann, "ZERODUR: new results on bending strength and stress corrosion", Proc. SPIE 8146, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts V, 81460P (14 September 2011); doi: 10.1117/12.893303; https://doi.org/10.1117/12.893303
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