Evaluation of a progressive failure analysis of unstiffened and stiffened composite panels

摘要

Progressive failure analysis of laminated composite unstiffened and stiffened panels has been carried out in the present investigation. The laminated panels under transverse static loadings in linear and elastic range have been investigated using finite element method. In the finite element analysis of stiffened panels, eight noded isoparametric quadratic elements in association with the three noded curved beam elements has been considered and first order shear deformation theory utilised. An iterative method has been adopted using the various failure theories to predict the first ply failure load. After the first ply failure, the stiffness of failed lamina has been totally discarded from the laminate and remained laminae are considered for further analysis. The progressive failure analysis using Tsai-Wu failure criterion has been implemented into a general-purpose finite element code to predict the failure loading from initial to final stage.