Crippling Failure and Experimental Verification of Composite Material Hat-Stringer

A finite element model is developed to investigate the failure mode of fiber-reinforced composite panel with different stiffener configurations during compressive loading. Tsai-Hill criteria is employed to predict the failure load of the specimen using ABAUQS, which shows a good agreement with the experimental data. Adding width of top layer to the hat-shape stiffener can increase the failure load and buckling resistance of the specimen studied by FEM and experiment method due to the increase of stiffness. Therefore, the additional reinforcing layer inside the stiffener can be beneficial for increasing the load capacity of stiffened panels. The analysis method mentioned above can provide support for the design and analysis of composite stringer.