An efficient postbuckling analysis technique for composite stiffened curved panels

Several efficient techniques are presented for the postbuckling analysis of composite stiffened structures in this paper. Some aerospace structures allow local buckling in order to increase structural efficiency. This idea may be a very effective design concept, but it takes a great deal of time in structural design. Due to its geometrical and material nonlinearity, the postbuckling analysis process requires a long computational time. In this report, to reduce the computational time, efficient analysis techniques are proposed. A change in the element type used, separation of the linear response region, and the termination of the analysis after ultimate failure of the structure were applied to the analysis. As a result, about 80% of the computational time was reduced with high accuracy.