A numerical study on curved additive manufactured BCC lattice structures: low velocity impact behaviour
摘要
Nowadays use of sandwich structures in structural design is increasing, especially in transportation engineering fields, such as aeronautical and automotive. Sandwich structures are characterized by two thin layers (skins) with a thick, but light, core in the middle, for increased stiffness to bending. The improvement of additive manufacturing techniques opens the door to adopting lattice structures, very light and geometrically complex structures based on a repetitive element, as cores of sandwich structures. The advantages offered by these structures are related to the possibility to variate the structural behaviour by changing geometrical factors such as the array configuration, the unit cell shape or topology, and the relative density. The research presented in this paper is aimed at studying low velocity impact behaviour on curved additive manufactured body-centred cubic (BCC) lattice structures. These structures are characterized by a length L of 10 mm and are numerically designed by modifying the core unit cell topology. Starting from a linear configuration, sine-waved struts were introduced along the main diagonals of the cube, with a wavelength of