A PARAMETRIC STUDY ON THE EFFECT OF ELLIPTICAL CUTOUTS FOR BUCKLING BEHAVIOR OF COMPOSITE PLATES UNDER NON-UNIFORM EDGE LOADS
THE SOLUTION FOR THE BUCKLING PROBLEMS OF COMPOSITES LAMINATES IS USUALLY BASED ON THE ASSUMPTIONS THAT THESE PANELS ARE SUBJECTED TO UNIFORM EDGES LOADS WITHOUT ANY DISCONTINUITY OR DAMAGES. NEVERTHELESS, IN PRACTICE THE PANELS ARE PROVIDED WITH VARIOUS SIZED OPENINGS SUBJECTED TO NON-UNIFORM EDGE LOADS. HENCE IN THIS WORK, A FINITE ELEMENTS ANALYSIS IS CARRIED OUT TO STUDY THE BUCKLING BEHAVIOUR OF COMPOSITE LAMINATES WITH VARIOUS SIZED ELLIPTICAL OPENINGS UNDER NON-UNIFORM EDGE LOADS. IN THESE FE FORMULATIONS, THE PANELS IS DISCRETISED BY ADOPTING 9-NODED HETEROSIS ELEMENT BY INCORPORATING THE EFFECT OF SHEAR DEFORMATION AND ROTARY INERTIA. THE CORRECTNESS OF THE FORMULATION IS VALIDATED BY CORRELATING THE RESULTS WITH AVAILABLE LITERATURE. THE INFLUENCE OF DIFFERENT SIZED ELLIPTICAL CUTOUTS ON THE BUCKLING BEHAVIOUR IS INVESTIGATED UNDER COMPRESSIVE AND TENSILE TYPES OF NON-UNIFORM IN-PLANE EDGE LOADS. THE EFFECTS OF VARIOUS PARAMETERS SUCH AS CUTOUT SIZES, PLY-ORIENTATION, ELLIPSE-ORIENTATION, BOUNDARY CONDITION AND PANEL THICKNESS IS INCLUDED IN THIS WORK. IT IS OBSERVED FROM THIS WORKS THAT THE ELLIPTICAL VERTICAL CUTOUT HAVE HIGHER BUCKLING RESISTANCE AS COMPARED TO THAT OF ELLIPTICAL HORIZONTAL CUTOUTS.
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