IMPROVED TRANSVERSE SHEAR STRESSES IN COMPOSITE FINITE ELEMENTS BASED ON FIRST ORDER SHEAR DEFORMATION THEORY

A method for calculating improved transverse shear stresses in laminated composite plates, which bases on the Þrst-order shear deformation theory is developed. In contrast to many recently established methods, either higher-order lamination theories or layerwise theories, it is easily applicable to Þnite elements, since only C0-continuity is necessary and the numerical e¤ort is low. The basic idea is to calculate the transverse shear stresses directly from the transverse shear forces by neglecting the inßuence of the membrane forces and assuming two cylindrical bending modes. Shear correction factors are no longer required, since the transverse shear sti¤nesses are also provided. Numerical examples for symmetric cross-ply and antisymmetric angle-ply laminates show the superiority of the method against using shear correction factors. Furthermore, results obtained with MSC/NASTRAN, which uses a similar but simpliÞed approach, are surpassed