The present application relates to a stopping device, a moving mechanism and an aircraft. The moving mechanism is connected to a stationary structure of the aircraft so as to allow the moving mechanism to move relative to the stationary structure. The stopping device includes a first stopper provided at the moving mechanism and a second stopper provided at the stationary structure, and is configured such that when a drive connection structure of the moving mechanism fails, the first stopper is adapted to abut against the second stopper to limit the moving range of the moving mechanism. At least one of the first stopper and the second stopper includes a buffer region made by modifying its meso-structure and thus has a reduced density to thereby be adapted to reduce a dynamic load generated when the first stopper collides with the second stopper.

An energy absorbing structure and method of making thereof is disclosed. The energy absorbing structure comprises an energy absorbing lattice structure having an irregular, but not random, lattice pattern. The irregular lattice pattern of the energy absorbing lattice structure may be a Voronoi cell pattern, which may be derived from a bovid skull horncore morphology. Other lattice patterns may be used, such as two-dimensional tessellations forming a distribution of asymmetric polygons or three-dimensional tessellations to form a distribution of asymmetric polyhedral shapes. The energy absorbing structure may further comprise one or more substrates to one or more sides of the energy absorbing lattice structure. The energy absorbing structure may be formed through additive manufacturing and has a variety of applications including, but not limited to, helmet liners, protective gear, shoe soles, packaging material, vehicle panels, or phone cases.

A part including a porous structure including cellular pores and formed at least in part by the periodic repetition of a basic pattern, each cellular pore being delimited by a wall, made of a metal or a polymer, having a parietal porosity greater than 5% and including parietal pores with a mean size less than the mean size of the cellular pores.