Mechanical property of lattice truss material in sandwich panel including strut flexural deformation

Lattice truss materials are usually assumed to be stretching dominated neglecting the bending resistance of struts. In this paper, bending resistance of struts is considered for lattice truss sandwich panels. The mechanical behaviors are not only decided by the relative density of the lattice and the strut inclination, but also the slenderness ratio of the strut. For stout and hierarchical struts, the slenderness ratio turns to smaller, and the shear force and the bending moment are comparable to the strut axial force. Compared with the stretching dominated theory, the stiffness of the lattice material should be improved while the strength reduced, which has been proved to be more consistent with experimental results.