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Interactive design of large end rings on stiffened conical shells using compositesDesign study methods and results for a composite reinforced base ring for the conical aeroshell structure of the planetary lander vehicle for Project Viking, an unmanned mission to Mars, are presented. The aeroshell is a ring and stringer-stiffened conical shell structure having a half angle of 70 degrees with a large base ring mounted at the outer edge of the cone and a large pay-load ring in the interior with many smaller rings spaced along the inside shell surface. The purpose of the structure is to develop the aerodynamic drag required to decelerate the lander in the Mars atmosphere to facilitiate a soft landing. The design of a shell structure of this complexity requires the use of the latest technology available in a large general-purpose shell buckling program. The large general-purpose non-linear shell buckling program (BOSOR 2) which was used for this purpose is described.
Document ID
19740049748
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Davis, R. C.
Cooper, P. A.
(NASA Langley Research Center Hampton, Va., United States)
Date Acquired
August 7, 2013
Publication Date
May 1, 1974
Subject Category
Structural Mechanics
Accession Number
74A32498
Distribution Limits
Public
Copyright
Other

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