Damage evolution of z-pin reinforced composite T-joint based on simplified bridging traction model

Z-pinned composite T-joint is reinforced by inserting thin metal or composite rods through the skin-flange section during manufacturing. Its mechanical properties are improved by bridging traction of Z-pin. ABAQUS software was used to build 3D numerical models of unpinned and z-pin reinforced T-joints. Based on cohesive zone approach, a new simplified bridging traction model of pins was developed to model the reinforcing process of Z-pins. The damage evolutions of unpinned and Z-pinned T-joints were respectively simulated. The tensile ultimate strength and total damage dissipation energy were calculated. And load-displacement curves and dissipation energy-displacement curves of unpinned and Z-pinned composite joints were compared. They agree with the results from references. It is shown that the ultimate load and displacement of Z-pinned joints are respectively 66% and 304% higher than their unpinned ones. At the beginning of damage, the slopes of load-displacement curves seem to be similar before the unpinned one fractured first. During fracture process, absorption energy of Z-pin reinforced T-joint is about 13.74 times more than that of unpinned one.