Interface damage analysis of composite hat-stiffened panels

Abstract

In order to reveal the mechanism of interfacial debonding damage of composite hat-stiffened panel, an eight-point bending model of single stiffened structure was designed. The finite element analysis was carried out by using the cohesive element to simulate debonding damage of interface between skin and rib. The deformation, interface stress and structural damage of the eight-point bending as well as the corresponding stiffened panel under axial compression were analyzed. The results showed that the initial debonding deformation was in good agreement with the interface stress distribution. For the eight-point bending model, although more damage appeared near the loading point due to stress concentration, it had little effect on the accurate prediction of interface damage behavior. The eight-point bending model can be used to evaluate the interface performance of corresponding multi-stiffened-panel during axial compression buckling by accurate simulation and parameter design, and it is helpful for the stiffness matching design of skin and stiffener.