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Mechanical Properties of ZnSe for the FEANICS ModuleMechanical and physical properties of ZnSe windows to be used with the FEANICS (Flow Enclosure Accommodating Novel Investigations in Combustion of Solids) experiments were measured in order to determine design allowables. In addition, the literature on crack growth properties was summarized. The average Young's modulus, Poisson's ratio, equibiaxial fracture strength, flaw size, grain size, Knoop hardness, Vicker's hardness, and branching constant were 74.3 +/- 0.1 GPa, 0.31, 57.8 +/- 6.5 MPa, 21 4 mm, 43 +/- 9 micron, 0.97 +/- 0.02 GPa, 0.97 +/- 0.02 GPa, and 1.0 +/- 0.1 MPam(exp 0.5), respectively. The properties of current ZnSe made by chemical vapor deposition are in good agreement with those measured in the 1970's. The hardness of CVD ZnSe windows is about one twentieth of the sapphire window being replaced, and about one-sixth of that of window glass. Thus the ZnSe window must be handled with great care. The large grain size relative to the inherent crack size implies the need to use single crystal crack growth properties in the design process. In order to determine the local failure stresses in one of the test specimens, a solution for the stresses between the support ring and the edge of a circular plate load between concentric rings was derived.
Document ID
20060051712
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Salem, Jon
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2006
Subject Category
Metals And Metallic Materials
Meeting Information
Meeting: 2006 Electromagnetic Windows Symposium
Location: San Diego, CA
Country: United States
Start Date: May 1, 2006
End Date: May 4, 2006
Funding Number(s)
WBS: WBS 155-01-03-03
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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