Accession Number : ADA308015

Title :   A Three-Node C Element for Analysis of Laminated Composite Sandwich Shells.

Descriptive Note : Technical memo.,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER

Personal Author(s) : Martin, C. W. ; Lung, S. F. ; Gupta, K. K.

PDF Url : ADA308015

Report Date : JUN 1989

Pagination or Media Count : 16

Abstract : A three-node fiat 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 shell element is reported in the appendix.

Descriptors :   *LAMINATES, *SANDWICH CONSTRUCTION, SHEAR PROPERTIES, ANGLES, FINITE ELEMENT ANALYSIS, STIFFNESS, FIBER REINFORCED COMPOSITES, DEFLECTION, ORIENTATION(DIRECTION), COMPOSITE STRUCTURES, GRAPHITE, BENDING, SHELLS(STRUCTURAL FORMS), MESH.

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE