Debonding Failure Mechanism of Composite Stiffened Plate Under Compression Load

The progressive failure model of composite stiffeners was established by using the commercial finite element software ABAQUS. Puck criterion was used to determine the failure of composite materials, and the material properties were exponentially attenuated according to the failure mode. The secondary stress criterion and B-K criterion are used to determine the initial and final failure of the interface. Then, the compression failure process of composite stiffened plate was simulated, and the effectiveness of the model was verified by experiments. On this basis, the failure mechanism of debonding is analyzed. Debonding begins at the intersection of the flexural nodal line ( or anti-nodal line) and the free edge of the lower edge of the rib, and the inducing factor is torque (or transverse bending moment).