Vol. 2, No. 4, 2007

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Stress analysis of composite cylindrical shells with an elliptical cutout

Erkan Oterkus, Erdogan Madenci and Michael P. Nemeth

Vol. 2 (2007), No. 4, 695–727

A special-purpose, semianalytical solution method for determining the stress and deformation fields in a thin, laminated-composite cylindrical shell with an elliptical cutout is presented. The analysis includes the effects of cutout size, shape, and orientation; nonuniform wall thickness; oval cross-sectional eccentricity; and loading conditions. The loading conditions include uniform tension, uniform torsion, and pure bending. The analysis approach is based on the principle of stationary potential energy and uses Lagrange multipliers to relax the kinematic admissibility requirements on the displacement representations through the use of idealized elastic edge restraints. Specifying appropriate stiffness values for the elastic extensional and rotational edge restraints (springs) allows the imposition of the kinematic boundary conditions in an indirect manner, which enables the use of a broader set of functions for representing the displacement fields. Selected results of parametric studies are presented for several geometric parameters that demonstrate that this analysis approach is a powerful means for developing design criteria for laminated-composite shells.

cylindrical, composite, cutout, stress
Received: 3 February 2006
Revised: 16 September 2006
Accepted: 29 November 2006
Published: 1 June 2007
Erkan Oterkus
Department of Aerospace and Mechanical Engineering
The University of Arizona
Tucson, AZ 85721
United States
Erdogan Madenci
Department of Aerospace and Mechanical Engineering
The University of Arizona
Tucson, AZ 85721
United States
Michael P. Nemeth
Structural Mechanics and Concepts Branch
NASA Langley Research Center
Hampton, VA 23681
United States