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Proceedings Paper

Design/analysis of the JWST ISIM bonded joints for survivability at cryogenic temperatures
Author(s): Andrew Bartoszyk; John Johnston; Charles Kaprielian; Jonathan Kuhn; Cengiz Kunt; Benjamin Rodini; Daniel Young
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Paper Abstract

A major design and analysis challenge for the JWST ISIM structure is thermal survivability of metal/composite adhesively bonded joints at the cryogenic temperature of 30K (-405°F). Current bonded joint concepts include internal invar plug fittings, external saddle titanium/invar fittings and composite gusset/clip joints all bonded to hybrid composite tubes (75mm square) made with M55J/954-6 and T300/954-6 prepregs. Analytical experience and design work done on metal/composite bonded joints at temperatures below that of liquid nitrogen are limited and important analysis tools, material properties, and failure criteria for composites at cryogenic temperatures are sparse in the literature. Increasing this challenge is the difficulty in testing for these required tools and properties at cryogenic temperatures. To gain confidence in analyzing and designing the ISIM joints, a comprehensive joint development test program has been planned and is currently running. The test program is designed to produce required analytical tools and develop a composite failure criterion for bonded joint strengths at cryogenic temperatures. Finite element analysis is used to design simple test coupons that simulate anticipated stress states in the flight joints; subsequently, the test results are used to correlate the analysis technique for the final design of the bonded joints. In this work, we present an overview of the analysis and test methodology, current results, and working joint designs based on developed techniques and properties.

Paper Details

Date Published: 19 August 2005
PDF: 10 pages
Proc. SPIE 5868, Optical Materials and Structures Technologies II, 58680K (19 August 2005);
Show Author Affiliations
Andrew Bartoszyk, Swales Aerospace (United States)
John Johnston, NASA Goddard Space Flight Ctr. (United States)
Charles Kaprielian, Swales Aerospace (United States)
Jonathan Kuhn, NASA Goddard Space Flight Ctr. (United States)
Cengiz Kunt, Swales Aerospace (United States)
Benjamin Rodini, Swales Aerospace (United States)
Daniel Young, Swales Aerospace (United States)

Published in SPIE Proceedings Vol. 5868:
Optical Materials and Structures Technologies II
William A. Goodman, Editor(s)

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