Design/analysis of the JWST ISIM bonded joints for survivability at cryogenic temperatures

Andrew Bartoszyk; John Johnston; Charles Kaprielian; Jonathan Kuhn; Cengiz Kunt; Benjamin Rodini; Daniel Young

doi:10.1117/12.619011

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19 August 2005 Design/analysis of the JWST ISIM bonded joints for survivability at cryogenic temperatures

Andrew Bartoszyk, John Johnston, Charles Kaprielian, Jonathan Kuhn, Cengiz Kunt, Benjamin Rodini, Daniel Young

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Proceedings Volume 5868, Optical Materials and Structures Technologies II; 58680K (2005) https://doi.org/10.1117/12.619011
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

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.

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Andrew Bartoszyk, John Johnston, Charles Kaprielian, Jonathan Kuhn, Cengiz Kunt, Benjamin Rodini, and Daniel Young "Design/analysis of the JWST ISIM bonded joints for survivability at cryogenic temperatures", Proc. SPIE 5868, Optical Materials and Structures Technologies II, 58680K (19 August 2005); https://doi.org/10.1117/12.619011

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