钛合金点阵夹芯结构弯曲性能

Response of 3D printing pyramid lattice structure under three-point bending were studied. Progressive damage during the loading process was detected with crack observation instrument. The results reflect that the main damage zone is in the middle of the specimen, where the maximum bending moment is located. The sudden drop of the load occurs with the buckling of the truss. The scanning electron microscope(SEM) is used to observe the fracture morphology which proves that the panels and trusses failed by bending. Finite element model with rigid nodes were established using ABAQUS. Damage location, damage propagation, peak load and failure modes are obtained, which corresponds with the test results. The effects of different unit numbers in width were investigated. It indicates that with more unit cells in width, the effects of the boundary are weakened, resulting in improvement of the load bearing capacity.