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Proceedings Paper

Thermal stress in a glass/metal bond with PR 1578 adhesive
Author(s): Eugene Huang
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Paper Abstract

PR 1578 adhesive is often used for bonding a glass mirror to its mounting flexures (Invar or Aluminum) when the mirror assembly is designed to operate in a low temperature environment PR 1578 is used because it has high strength and remains elastic at low temperature. Several tests conducted at Itek, however, show that the thermal stress induced in the bond may cause fracture of the glass near the bond at cryogenic temperawre. This paper examines the reason of fracture and the effects of flexure material, adhesive thickness, and size of bonding. A finite element model is developed for simulating the bonding of flexure, adhesive, and glass. Temperature dependent material properties are used in the analysis. Good correlation between the analysis and the test is obtained.

Paper Details

Date Published: 1 October 1990
PDF: 7 pages
Proc. SPIE 1303, Advances in Optical Structure Systems, (1 October 1990); doi: 10.1117/12.21497
Show Author Affiliations
Eugene Huang, Litton Itek Optical Systems (United States)

Published in SPIE Proceedings Vol. 1303:
Advances in Optical Structure Systems
John A. Breakwell; Victor L. Genberg; Gary C. Krumweide, Editor(s)

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