Accession Number : ADA301799

Title :   A Refined Shear Deformation Theory for the Analysis of Laminated Plates.

Descriptive Note : Contract rept.,

Corporate Author : VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF ENGINEERING SCIEN CE AND MECHANICS

Personal Author(s) : Reddy, J. N.

PDF Url : ADA301799

Report Date : JAN 1986

Pagination or Media Count : 37

Abstract : A refined, third-order plate theory that accounts for the transverse shear deformation is presented, the Navier solutions are derived, and its finite element models are developed. The theory does not require the shear correction factors of the first-order shear deformation theory because the transverse shear stresses are represented parabolically in the present theory. A mixed finite element model that uses independent approximations of the displacements and moment resultants, and a displacement model that uses only displacements as degrees of freedom are developed. The mixed model uses C(0) elements for all variables and the displacement models use C(1) elements for the transverse deflection and C(0) elements for other displacements. Numerical results are presented to show the thickness effect on the deflections, and the accuracy of the present theory in predicting the transverse stresses. A comparison of the results obtained using the finite element models of the present theory with the experimental and the three-dimensional elasticity theory shows that the present theory is more accurate than the first-order shear deformation plate theory. (MM)

Descriptors :   *LAMINATES, *DEFORMATION, *SHEAR STRESSES, MATHEMATICAL MODELS, THICKNESS, COMPOSITE MATERIALS, FINITE ELEMENT ANALYSIS, COMPARISON, STIFFNESS, DISPLACEMENT, ELASTIC PROPERTIES, MODULUS OF ELASTICITY, DEFLECTION, BENDING, MESH, DEGREES OF FREEDOM, PLATES, APPROXIMATION(MATHEMATICS), BOUNDARY VALUE PROBLEMS, NAVIER STOKES EQUATIONS, TRANSVERSE.

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE