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Viability of 3 D Woven Carbon Cloth and Advanced Carbon-Carbon Ribs for Adaptive Deployable Entry Placement Technology (ADEPT) for Future NASA MissionsThis paper describes aerothermodynamic and thermal structural testing that demonstrate the viability of three dimensional woven carbon cloth and advanced carbon-carbon (ACC) ribs for use in the Adaptive Deployable Entry Placement Technology (ADEPT). ADEPT is an umbrella-like entry system that is folded for stowage in the launch vehicle's shroud and deployed prior to reaching the atmeopheric interface. A key feature of the ADEPT concept is a lower ballistic coefficient for delivery of a given payload than seen with conventional, rigid body entry systems. The benefits that accrue from the lower ballistic coefficient incllude factor-of-ten reductions of deceleration forces and entry heating. The former enables consideration of new classes of scientific instruments for solar system exploration while the latter enables the design of a more efficient thermal protection system. The carbon cloth base lined for ADEPT has a dual use in that it serves as the thermal protection system and as the "skin" that transfers aerdynamic deceleration loads to its umbrella-like substructure. Arcjet testing described in this paper was conducted for some of the higher heating conditions for a future Venus mission using the ADEPT concept, thereby showing that the carbon cloth can perform in a relevant entry environment. Recently completed the thermal structural testing of the cloth attached to a representative ACC rib design is also described. Finally, this paper describes a preliminary engineering level code, based on the arcjet data, that can be used to estimate cloth thickness for future ADEPT missions and to predict carbon cloth performance in future arcjet tests.
Document ID
20140007375
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Venkatapathy, Ethiraj
(NASA Ames Research Center Moffett Field, CA United States)
Arnold, James O.
(NASA Ames Research Center Moffett Field, CA, United States)
Peterson, K. H.
(Engineering Research and Consulting, Inc. Mountain View, CA, United States)
Blosser, M. L.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
June 13, 2014
Publication Date
June 24, 2013
Subject Category
Composite Materials
Report/Patent Number
ARC-E-DAA-TN9793
Meeting Information
Meeting: National Space and Missiles Materials Symposium
Location: Bellevue, WA
Country: United States
Start Date: June 24, 2013
End Date: June 28, 2013
Sponsors: National Space and Missiles Materials
Funding Number(s)
CONTRACT_GRANT: NNA10DE12C
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
ADEPT
Entry
3D Woven
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