STRESS ANALYSIS OF LAMINATED COMPOSITE AND SANDWICH BEAMS USING A NOVEL SHEAR AND NORMAL DEFORMATION THEORY
Keywords:SHEAR DEFORMATION, TRANSVERSE FLEXIBILITY, LAMINATED THICK BEAM, SANDWICH BEAM, TRANSVERSE SHEAR STRESS.
A NOVEL NORMAL AND SHEAR DEFORMATION THEORY (NSDT) FOR ANALYSIS OF LAMINATED COMPOSITE AND SANDWICH BEAMS, TAKING INTO ACCOUNT SHEAR DEFORMATION AS WELL AS NORMAL DEFORMATION, IS PRESENTED WITH INCORPORATION OF SHEAR DEFORMATION AND TRANSVERSE FLEXIBILLITY. A GENERALIZED DISPLACEMENT-BASED REFINED FORMULATION IS DEVELOPED WITH INCLUSION OF VARIOUS WARPING FUNCTIONS IN TERMS OF THICKNESS COORDINATES TO REPRESENT SHEAR AND NORMAL DEFORMATION EFFECTS. THESE EFFECTS BECOME PRONOUNCED IN THICK LAMINATED BEAMS AND PARTICULARLY IN SANDWICH BEAMS WITH TRANSVERSELY FLEXIBLE CORE. PRESENT FORMULATION SATISFIES THE SHEAR STRESS FREE SURFACE CONDITIONS AT THE TOP AND BOTTOM SURFACES OF THE BEAM WITH REALISTIC THROUGH-THE-THICKNESS VARIATION OF TRANSVERSE SHEAR STRESSES. THE OBJECTIVE OF THE PAPER IS TO INVESTIGATE THE FLEXURAL BEHAVIOR OF THICK LAMINATED AND SANDWICH BEAMS UNDER PLANE STRESS CONDITIONS USING A NEW NORMAL AND SHEAR DEFORMATION THEORY.
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