Determination of Critical Width of Multiple Delamination in Laminated Composite Plate Under Buckling Load

摘要

In order to investigate the effects of multiple delaminations' width on the buckling loads of the simply supported woven steel-reinforced thermoplastic-laminated composite plates, having the strip and lateral delamination regions between each layers, 3-D finite elements models have been established. The critical delamination representing the maximum delamination sizes and tolerate value in a structure without decreasing compressive strength has been obtained from the evalution of the buckling analyses. There are four layers and two different delamination shapes, vertical and horizontal, in models. The orientation angles of the fibers have been choosen as [0°]4, [15/-15°]_s, [15/-15°]_2, [30/-30°]_s, [30/-30°]_2, [45°]_4 and [45/-45°]_s. Firstly, the harmony between theoretical and finite element solutions' results of the plate without delamination has been shown. Then, the buckling loads have been determined for each model having different delamination width. There is no important decrease in buckling loads until certain values of delamination width exactly. For the symmetrical and antisymmetrical cases the obtained results show that the changing ratios are the same for each angle. By comparing orientation angle, it can be said that the values and changing ratios of the buckling loads of high-value orientation angles are higher than the low values.