Journal ArticleDOI
Formulation and evaluation of an analytical model for composite box-beams
Edward C. Smith,Inderjit Chopra +1 more
TLDR
In this article, a direct method for determining the effective elastic stiffnesses and deformation behavior of composite box-beam (BB) structures is developed analytically, validated, and demonstrated.Abstract:
A direct method for determining the effective elastic stiffnesses and deformation behavior of composite box-beam (BB) structures is developed analytically, validated, and demonstrated. The BB walls are modeled as orthotropic-ply laminated plates, so that the elastic properties vary both through the thickness and around the BB contour; deformation is described in terms of extension, bending, twisting, shearing, and torsion-related out-of-plane warping. Numerical results for several BB configurations are presented in tables and graphs and compared with experimental data and FEM computations (Stemple and Lee, 1989): good general agreement is obtained for cross-ply, antisymmetric, and symmetric layups, except for symmetric layups with ply orientation angles theta greater than 30 deg. Both out-of-plane warping and transverse shear coupling are found to have significant effects on BB elastic response.read more
Citations
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Journal ArticleDOI
VABS: A new concept for composite rotor blade cross-sectional modeling
Journal ArticleDOI
Theory of anisotropic thin-walled closed-cross-section beams
TL;DR: In this paper, a variationally and asymptotically consistent theory is developed in order to derive the governing equations of anisotropic thin-walled beams with closed sections.
Rotorcraft Aerodynamics Models for a Comprehensive Analysis
TL;DR: In this paper, a force balance method for calculating section loads of a bearingless rotor rotor was proposed, and the results were compared with the results from a full-scale wind tunnel test.
References
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Book
The Theory of Thin Walled Bars
TL;DR: A detailed exposition of the various facets of thin walled bar theory, including torsion and flexure, bars with open and closed cross sections, nonlinear theory with application to buckling, and rigid-plastic theory of open-and closed bars is given in this article.
Journal ArticleDOI
Thin-walled composite beams under bending, torsional, and extensional loads
TL;DR: In this paper, symmetric and antisymmetric layup graphite-epoxy composite beams with thin-walled rectangular cross sections are fabricated using an autoclave molding technique and tested under bending, torsional, and extensional loads.
Book
Introduction to the theory of thin-walled structures
TL;DR: This book introduces designers to the theoretical aspects of the behaviour of thin-walled structures, and then shows how some codes of practice have incorporated this theory and modified it to be more digestible in a design office.
Journal ArticleDOI
A Beam Theory for Anisotropic Materials
TL;DR: In this paper, the beam theory derived from variational principles is based on the sole kinematic assumption that each section is infinitely rigid in its own plane, but free to warp out of plane.