Parametric modeling method for design and bending failure analysis of graded lattice structures

The graded lattice structures have advantages in optimizing structure. In this paper, a parametric modeling method of graded lattice structure is proposed. The continuum damage model is used to evaluate the failure load of the structures. In this paper, two types of graded lattice structure are built by parametric modeling method: the cell-size-changed graded lattice structure (the densities of the structures are constant) and the bar-width-changed graded lattice structure (the masses of the structures are constant). The failure loads of the structures under three-point bending load are investigated. The results show that the smaller middle cell improves the bending failure load of the cell-size-changed graded lattice structures up to 52%, and the wider sandwich bar in the middle of the structure improves the bending failure load of the Bar-width-changed graded lattice structures up to 31%. Meanwhile, the graded parameter of the structures will influence the failure mode of the structures.