Destruction Process Analysis Of Whole Shaping Laminate With Interface Reinforced

Now, Stiffened composite panels has been used in many fields such as aerospace and machinery. The test indicate that, The separation of interface take place between skin and stiffener, so we can find that the damage of interface is one of the most important Failure way of stiffened composite panels in daily life. It is necessary to reinforce the interface.First, we take an experiment and simulation study on the effect of Z-pin reinforced on the pull-off and shear carrying capacity of fiber placement composite T-joints, we created pull-off and shear model of T-joint specimens. The interface failure was simulated with cohesive zone model, and the effect of Z-pin was simulated with nonlinear springs inserted into the interface. The test and ABAQUS results donate that Z-pin can effectively improved the pull-off and shear carrying capacity of T-joints. And we made a strength analysis model to study the buckling and post-buckling behavior of stiffened composite panels with Z-pin reinforced. The buckling load and post-buckling strength capacity are well predicted. In the model, The interface failure was simulated with cohesive zone model, and the effect of Z-pin was simulated with nonlinear springs inserted into the interface. Parametric studies are conducted to study the effects of diameters, density and insertion angle of Z-pin and stacking sequences on model of failure and ultimate strength of stiffened composite panels with Z-pin reinforced are obtained. The study results donated that we can effectively improve the ultimate strength with improving diameters, density and insertion angle. And it is not important for the model of failure.