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Mechanical properties of silicate glasses exposed to a low-Earth orbitThe effects of a 5.8 year exposure to low earth orbit environment upon the mechanical properties of commercial optical fused silica, low iron soda-lime-silica, Pyrex 7740, Vycor 7913, BK-7, and the glass ceramic Zerodur were examined. Mechanical testing employed the ASTM-F-394 piston on 3-ball method in a liquid nitrogen environment. Samples were exposed on the Long Duration Exposure Facility (LDEF) in two locations. Impacts were observed on all specimens except Vycor. Weibull analysis as well as a standard statistical evaluation were conducted. The Weibull analysis revealed no differences between control samples and the two exposed samples. We thus concluded that radiation components of the Earth orbital environment did not degrade the mechanical strength of the samples examined within the limits of experimental error. The upper bound of strength degradation for meteorite impacted samples based upon statistical analysis and observation was 50 percent.
Document ID
19920015602
Document Type
Conference Paper
Authors
Wiedlocher, David E. (Vanderbilt Univ. Nashville, TN., United States)
Tucker, Dennis S. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Nichols, Ron (NASA Marshall Space Flight Center Huntsville, AL, United States)
Kinser, Donald L. (Vanderbilt Univ. Nashville, TN., United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1992
Publication Information
Publication: NASA. Langley Research Center, LDEF: 69 Months in Space. First Post-Retrieval Symposium, Part 2
Subject Category
NONMETALLIC MATERIALS
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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