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High Strain Composites for Space Applications: Challenges of Fabricating Long Deployable-Stowable Booms

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Title: High Strain Composites for Space Applications: Challenges of Fabricating Long Deployable-Stowable Booms

Authors: Craig S. Hazelton, Brian Sanders, Anan Takroori, Zach McConnel

DOI: 10.33599/nasampe/c.24.0336

Abstract: High-strain composites (HSC) enable stowable structural members for large space applications, such as solar sails, or laser accelerated light sails, however the long lengths (30 m, [100 ft]) required present tremendous fabrication challenges. The main issue is inconsistency in geometry in the form of bowing, arching, and twist of linear booms. This application requires specially designed thin layups that achieve very large strain limits to allow packaging the booms in small volumes to fit into standard launch vehicles. Due to cost constraints, stainless steel molds (large part to mold CTE mismatch) are used instead of low CTE metal or composite and an out-of-autoclave process is developed with custom equipment built in-house to control of mold and oven movement as well as airflow and thermal gradients. In general, the technique proves to reduce inconsistencies in part geometry. In particular, the process was found to work very well with 7m booms, but geometric issues flare during scale up to the 30m length. Both the thin laminate and the long length amplify issues that create the problematic geometry. Preform distortion, thermal expansion mismatch, mold and oven movement, bagging stack up, fiber wetting and all lead to issues with dimensional and geometric consistency. To achieve the desired part consistency in 30 m booms, special techniques are used to apply the preform to the mold to eliminate distortion that can create uneven residual stresses. The catalyzed epoxy novolac matrix limited options for changing the cure profile, however long dwells at sub-curing temperature reduce problems. Furthermore, a special bagging stack technique was developed to balance resin distribution through the thin laminate. Finally, adequate fiber wetting is addressed by finding a compatible carbon fiber and finish (there is a limited selection due to very thin fabric required for HSC’s) through trial and error.

References: [1] Zachary McConnel, Brian Sanders, Anan Takroori, Craig Hazelton, Jim Pearson, Carlos Diaz, Ashley Benson, Test of a Full-Scale Quadrant for the 1,653m2 Solar Cruiser Sail, 6th International Symposium on Space Sailing (ISSS 2023), New York, USA, 5-9 June 2023. [2] Les Johnson, F. Curran, R. Dissly, A. Heaton, Dana Turse, The Solar Cruiser Mission: Demonstrating Large Solar Sails for Deep Space Missions, December 2020, https://www.researchgate.net/publication/347079622 (accessed 03.02.23) [3] L. Herbeck, M. Eiden, M. Leipold, C. Sickinger, and W. Unckenbold, “Development and Test of Deployable Lightweight CFRP-Booms for a Solar Sail,” presented at European Conference on Spacecraft Structures, Materials and Mechanical Testing, 29 Nov - 1 Dec, 2000 at ESTEC, Noordwijk, The Netherlands. [4] Stephen W. Tsai, Sangwook Sihn and Ran Y. Kim, THIN PLY COMPOSITES, 46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics & Materials Conference, 18 - 21 April 2005, Austin, Texas [5] Joshua E. Salazar and Juan M. Fernandez, “Experimental Characterization of the Dimensional Stability of Deployable Composite Booms During Stowage,” Paper No. AIAA 2021-0195 Presented at AIAA Scitech Forum 2021. [6] Kevin Cox, Kameron Medina, An Investigation of Inner Flange Buckling Demonstrating Large Solar Sails for Deep Space Missions, December 2020, https://www.researchgate.net/publication/347079622 (accessed 03.02.23) in Furlable Composite Booms, November 2018, DOI:10.12783/asc33/26162, American Society for Composites 2018 [7] Lee Nguyen, Kamron Medina, Zachary McConnel and Mark S. Lake, SOLAR CRUISER TRAC BOOM DEVELOPMENT, Published Online:19 Jan 2023 https://doi.org/10.2514/6.2023-1507 [8] C. Leclerc, Sergio Pellegrino, ULTRA-THIN COMPOSITE DEPLOYABLE BOOMS, published 2017, Engineering, Materials Science [9] Tom Murphey, J. Banik,“Triangular Rollable and Collapsible Boom”, U.S. Patent 7895795 B1, filed on 22 October 2007 and published on 1 March 2011 [10] Tom Murphey, Dana Turse, D. E., Larry Adams, ""TRAC Boom Structural Mechanics”, 4th AIAA Spacecraft Structures Conference, AIAA SciTech 2017 Forum, Grapevine, TX, 9-13 Jan. 2017 [11] D.W. Radford and T.S. Rennick, DETERMINATION OF MANUFACTURING DISTORTION IN LAMINATED COMPOSITE COMPONENTS, Composite Materials, Manufacture and Structures Laboratory, Mechanical Engineering, Colorado State University, Fort Collins, Colorado 80523-1374

Conference: CAMX 2024 | San Diego CA

Publication Date: 2024/9/9

SKU: TP24-0000000336

Pages: 10

Price: $20.00

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