DYNAMIC LOADING CAPACITY OF STIFFENED DELAMINATED PLATES

The dynamic response and loading capacity of the stiffened delaminated penetration composite plates werestudied by finite element method. Using the first-order shear deformation theory derives a formula of element stiffness andmass matrices for the composite laminated plate and beam. A damping model is deduced by using Rayleigh damping modeltogether with Adams’strain energy method (MSE) . A delaminated constrained model and a virtual interface element arealso developed to avoid the overlap and penetration phenomenon between the upper and lower sub-laminates at the delaminated region. The failure analysis method for the stiffened delaminated plates under dynamic load is established by Tsai’sfailure criterion and corresponding reduced stiffness role. By some numerical examples , the effects of frequency of dynamicload , delamination depth , stiffener location and reduction of structure stiffness during the failure process upon dynamic behavior of the delaminated composite laminates are discussed. The method and conclusions would be useful for compositestructures designers.