Novel three-dimensional chiral negative Poisson ratio multi-cell energy absorption structure

Abstract

The invention discloses a novel three-dimensional chiral negative Poisson ratio multi-cell energy absorption structure. The structure comprises a plurality of energy absorption layers which are stacked in sequence, wherein the energy absorption layer comprises a plurality of hexagonal chiral structure unit cells; each hexagonal chiral structure unit cell comprises a central circular ring, first tosixth connecting rods; the rotation directions of the hexagonal chiral structure unit cells in the energy absorption layer are the same, and the first to sixth connecting rods of the adjacent hexagonal chiral structure unit cells are correspondingly connected to form an array; the hexagonal chiral structure unit cells of the adjacent energy absorption layers are in one-to-one correspondence and opposite in rotation direction, and interlayer spiral supporting structures are arranged between the hexagonal chiral structure unit cells corresponding to the adjacent energy absorption layers. By means of stacking of the micro structures, elastic displacement of the structure before reaching the yield limit is improved to a great extent, initial impact force is absorbed by means of large displacement, residual impact is absorbed by means of large counter force, and the structure has great advantages in absorption of centralized, repeated and small-magnitude impact energy.

Description

technical field [0001] The invention relates to the field of negative Poisson's ratio multicellular energy-absorbing structures, in particular to a novel three-dimensional chiral negative Poisson's ratio multicellular energy-absorbing structure. Background technique [0002] At present, there are many types of energy-absorbing structures used in practical engineering. From the perspective of energy-absorbing principles, there are mainly two forms of energy-absorbing plastic deformation and elastic deformation. Although they can play a good role in protection in the industry, they are both There are certain flaws. [0003] Plastic deformation energy-absorbing devices, such as energy-absorbing boxes in automobile bumpers, anti-collision partitions in protective walls of important facilities, and drop impact energy-absorbing devices at the bottom of aircraft, are basically tubular or honeycomb two-dimensional structures. This type of structure mainly uses the plastic crushing ...

AI Technical Summary

Problems solved by technology

However, due to the limited elastic deformation range of the elastic structure, it is not suitable for energy absorption of large load impacts, and is prone to damage and failure

And the energy absorption mode of the structure is single, which cannot effectively absorb the non-uniform impact energy

Images