Buckl ing and postbuckl ing response analysis of the doubly2curve composite shell by nonl inear FEM

According to the finite element package ABAQUS , the buckling and postbuckling response of the doubly2curved composite shell under t ransverse loads was obtained by using the nonlinear finite element method. A
progressive failure model based on the Tsai2Wu failure criterion was int roduced in the finite element procedure to predict the initial failure and the progressive failure process. The effect of geomet ric parameters on the buckling and postbuckling response has been discussed in detail . The buckling and postbuckling of doubly2curved composite shells with stiffeners subjected to combined loads were simulated. The result s indicate that the shear load is helpful to the increase of the buckling loads.