Stresses Around Holes in Stiffened Composite Panels Using Laurent-Series and Finite Element Methods.
ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MASS
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This paper deals with an analytical determination of the stress field around a symmetrically placed hole whose shape is one of a circle or an ellipse. The hole is in an orthotropic panel strip whose edges are reinforced with stiffeners of similar orthotropic material. The panel is subjected to tension at the remote ends. The stresses have been calculated using both a Laurent-series expansion in complex potentials and a finite-element approach using a simple quadrilateral element. The accuracy of the finite element approach was checked against the Laurent-series method and was found to be extremely satisfactory for obtaining profiles of stress variation from the vicinity of the hole to the stiffener edge. Curves showing the influence of the edge stiffening on the stresses are shown for a variety of parameters.
- Laminates and Composite Materials