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Measuring Mechanical Properties Of Optical GlassesReport discusses mechanical tests measuring parameters of strength and fracture mechanics of optical glasses. To obtain required tables of mechanical properties of each glass of interest, both initial-strength and delayed-fracture techniques used. Modulus of rupture measured by well-known four-point bending method. Initial bending strength measured by lesser-known double-ring method, in which disk of glass supported on one face near edge by larger ring and pressed on its other face by smaller concentric ring. Method maximizes stress near center, making it more likely specimen fractures there, and thereby suppresses edge effects. Data from tests used to predict reliabilities and lifetimes of glass optical components of several proposed spaceborne instruments.
Document ID
19890000365
Document Type
Other - NASA Tech Brief
Authors
Tucker, Dennis S. (University of Alabama)
Nichols, Ronald L. (University of Alabama)
Date Acquired
August 14, 2013
Publication Date
July 1, 1989
Publication Information
Publication: NASA Tech Briefs
Volume: 13
Issue: 7
ISSN: 0145-319X
Subject Category
MATERIALS
Report/Patent Number
MFS-27206
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.