Publisher : The Korean Society for Aeronautical & Space Sciences
DOI : 10.5139/IJASS.2003.4.1.009
Title & Authors
A Study on Assessment of Composite Couplings for Helicopter Rotor Blades with Multi-cell Sections Jung, Sung-Nam; Park, Il-Ju; Shi, Eui-Sup; Chopra, Inderjit;
In this work, a closed-form analysis is performed for the structural response of coupled composite blades with multi-cell sections. The analytical model includes the effects of shell wall thickness, transverse shear, torsion warping and constrained warping. The mixed beam approach based on Reissner's semi-complementary energy functional is used to derive the beam force-displacement relations. The theory is validated against experimental test data and other analytical results for coupled composite beams and blades with single-cell box-sections and two-cell airfoils. Correlation of the present method with experimental results and detailed finite element results is found to be very good.
Mansfield, E. H., "The Stiffness of a Two-Cell Anisotropic Tube," Aeronautical Quarterly, May 1981, pp. 338-353.
Volovoi, V. V., and Hodges, D. H., "Single- and Double-Celled Composite Thin-Walled Beams," Proceedings of the 41st Structures, Structural Dynamics, and Materials Conference, Atlanta, GA, Apr. 3-6, 2000, AIAA Paper 2000-1537.
Badir, A. M, "Analysis of Two-Cell Composite Beams," Proceedings of the 36th Structures, Structural Dynamics, and Materials Conference, New Orleans, LA, Apr. 10-12, 1995, pp. 419-424.
Chandra, R., and Chopra, I., "Coupled Composite Rotor Blades under Bending and Torsional Loads," AHS Specialists Meeting on Rotorcrqft Structures, Williamsburg, Virginia, Oct. 28-31, 1991.
Jung, S. N., Nagaraj , V. T., and Chopra, I., "Refined Structural Model for Thin- and Thick- Walled Composite Rotor Blades," AlAA Journal, Vol. 40, No. 1, Jan. 2002, pp. 105-116.
Gjelsvik, A., The Theory of Thin Walled Bars, John Wiley & Sons, Inc., 1981.
Chandra, R., and Chopra, I., "Structural Response of Composite Beams and Blades with Elastic Couplings," Composites Engineering, Vol. 2, Nos. 5-7, 1992, pp. 347-374.