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A three-node C deg element for analysis of laminated composite sandwich shellsA three-node flat shell element with C deg rotation fields has been developed for analysis of arbitrary composite shells. The element may consist of any number of orthotropic layers, each layer having different material properties and angular orientation. The formulation includes coupling between bending and extension, which is essential for analysis of unsymmetric laminates. Shearing deflections are included, since laminated and sandwich construction frequently results in shear stiffness much smaller than bending stiffness. Formulation of the element is straightforward, and calculation of its stiffness matrix is simple and fast. Convergence of solutions with mesh refinement is uniform for both thin and thick shells and is insensitive to element shape, although not as rapid as some other elements that lack one or more capabilities of the newly developed element. An experimental verification of the shall element is reported in the appendix.
Document ID
19890017842
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Martin, C. Wayne (NASA Ames Research Center Moffett Field, CA, United States)
Lung, S. F. (NASA Ames Research Center Moffett Field, CA, United States)
Gupta, K. K. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 6, 2013
Publication Date
June 1, 1989
Subject Category
Structural Mechanics
Report/Patent Number
H-1479
NAS 1.15:4125
NASA-TM-4125
Accession Number
89N27213
Funding Number(s)
PROJECT: RTOP 533-02-51
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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