Progressive failure analysis of laminated composite plates by finite element method

The progressive failure analysis of laminated composite plates under transverse static loading has been carried out in linear and elastic range. The laminated composite plate has been modeled using eight noded isoparametric plate bending elements. The first order-shear deformation theory has been applied and a shear correction factor is used. After the failure of the weakest ply, the stiffness is reduced by either fiber failure or matrix failure. The stiffness of failed lamina has been totally discarded and other existing laminae are considered to remain unchanged after the weakest ply failure. The strength of the laminate at the same point is evaluated again to see if the laminate can carry additional load. This ply-by-ply analysis progresses until the ultimate strength of the laminate is reached. The results in terms of first-ply failure load obtained in the present investigation have been compared with those available in published literature. A parametric study has been done on the progressive failure analysis.