Accession Number : ADA300637

Title :   Comparison of Composite Rotor Blade Models: A Coupled-Beam Analysis and an MSC/NASTRAN Finite-Element Model.

Descriptive Note : Technical memo.,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER

Personal Author(s) : Hodges, Robert V. ; Nixon, Mark W. ; Rehfield, Lawrence W.

PDF Url : ADA300637

Report Date : MAR 1987

Pagination or Media Count : 16

Abstract : A methodology was developed for the structural analysis of composite rotor blades.This coupled-beam analysis is relatively simple to use compared with alternative analysis techniques. The beam analysis was developed for thin-wall single-cell rotor structures and includes the effects of elastic coupling. This paper demonstrates the effectiveness of the new composite-beam analysis method through comparison of results of the coupled-beam analysis with those of an established baseline analysis technique. The baseline analysis is an MSC/NASTRAN finite-element model built up from anisotropic shell elements. Deformations are compared for three linear static load cases of centrifugal force at design rotor speed, applied torque, and lift for an ideal rotor in hover. A D-spar designed to twist under axial loading is the subject of the analysis. Results indicate the coupled-beam analysis is well within engineering accuracy.

Descriptors :   *STRUCTURAL ANALYSIS, *COMPOSITE STRUCTURES, *ROTOR BLADES(ROTARY WINGS), VELOCITY, STRESS STRAIN RELATIONS, MATHEMATICAL MODELS, COUPLING(INTERACTION), FINITE ELEMENT ANALYSIS, STATIC LOADS, STRUCTURAL MECHANICS, COMPARISON, BEAMS(STRUCTURAL), DEFORMATION, MODULUS OF ELASTICITY, ACCURACY, SHELLS(STRUCTURAL FORMS), SHEAR STRESSES, TORQUE, TORSION, AXIAL LOADS, HOVERING, GRAPHITE EPOXY COMPOSITES, TWIST(MOTION), BENDING MOMENTS, THIN WALLS, CENTRIFUGAL FORCE.

Subject Categories : Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE