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Record Details

Record 59 of 38619
Geometrically Nonlinear Finite Element Analysis of a Composite Space Reflector
Author and Affiliation:
Lee, Kee-Joo(Maryland Univ., Dept. of Aerospace Engineering, College Park, MD United States)
Leet, Sung W.(Maryland Univ., Dept. of Aerospace Engineering, College Park, MD United States)
Clark, Greg(NASA Goddard Space Flight Center, Greenbelt, MD United States)
Broduer, Steve [Technical Monitor]
Abstract: Lightweight aerospace structures, such as low areal density composite space reflectors, are highly flexible and may undergo large deflection under applied loading, especially during the launch phase. Accordingly, geometrically nonlinear analysis that takes into account the effect of finite rotation may be needed to determine the deformed shape for a clearance check and the stress and strain state to ensure structural integrity. In this study, deformation of the space reflector is determined under static conditions using a geometrically nonlinear solid shell finite element model. For the solid shell element formulation, the kinematics of deformation is described by six variables that are purely vector components. Because rotational angles are not used, this approach is free of the limitations of small angle increments. This also allows easy connections between substructures and large load increments with respect to the conventional shell formulation using rotational parameters. Geometrically nonlinear analyses were carried out for three cases of static point loads applied at selected points. A chart shows results for a case when the load is applied at the center point of the reflector dish. The computed results capture the nonlinear behavior of the composite reflector as the applied load increases. Also, they are in good agreement with the data obtained by experiments.
Publication Date: Jan 23, 2001
Document ID:
20010089227
(Acquired Sep 28, 2001)
Subject Category: COMPOSITE MATERIALS
Document Type: Preprint
Meeting Information: FEMCI Workshop 2001: Innovative FEM Solutions to Challenging Problems; 16-17 May 2001; Greenbelt, MD; United States
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: LARGE SPACE STRUCTURES; ELASTIC DEFORMATION; NONLINEAR SYSTEMS; COMPUTERIZED SIMULATION; FINITE ELEMENT METHOD; STRESS-STRAIN RELATIONSHIPS; PARABOLIC REFLECTORS
Availability Source: Other Sources
Availability Notes: Abstract Only
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