Lattice structure and its unit structure, lattice sandwich structure

Abstract

The invention relates to a lattice structure and its unit structure, and a lattice sandwich structure. The unit structure includes a first base, a second base, and a connecting rod connecting the first base and the second base; the angle between the connecting rod and the horizontal plane is set to θ, 40 °≤θ≤50°, wherein: the length of the connecting rod is L, the width of the cross-section of the connecting rod along the vertical plane perpendicular to the central axis is W, and the connecting rod is along the vertical plane perpendicular to the central axis. The thickness of the straight cross-section is T, and T≤W, 0.1≤W / L≤0.15. The plastic strain of the unit structure of the present invention is small, the adjustment of the energy absorption curve can be realized through the design of the parameters of the unit structure, and the unit structure can be restored to deformation by the action of an external force, and can be reused, thereby expanding the splicing of the lattice unit. The application range of lattice structure and lattice sandwich structure.

Description

technical field [0001] The invention relates to the technical field of energy-absorbing materials, in particular to a lattice structure and its unit structure, and a lattice sandwich structure. Background technique [0002] Energy-absorbing materials are widely used in personnel protection, building shock absorption, impact resistance of automobiles and aircraft, and protection of precision parts. Traditional energy-absorbing materials include square thin-walled beams, bellows, honeycomb structure materials, egg-box structure materials, foam metal materials, lattice materials, etc. [0003] Among them, the square thin-walled beam has a simple structure and strong energy absorption capacity, and is widely used in the collision energy absorption of automobiles. Such as figure 1 As shown, when subjected to an impact load, the square thin-walled beam undergoes lateral buckling, causing the metal material to undergo plastic deformation, thereby absorbing the impact force. The ...

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Problems solved by technology

The stress-strain curve of the tetrahedral lattice material after compression is as follows image 3 shown, from image 3 It can be seen that since the stress of the structure is always greater than 0, during the compression process, the structure is always only the stable structure of the initial structure. When subjected to a huge impact load, the structure will undergo a large plastic deformation, and its impact resistance will be extremely low. big drop

[0007] Therefore, although square thin-walled energy-absorbing beams, egg-box structural materials, foam metal materials, and lattice materials all have good energy-absorbing properties, they also have the defects of irreversible deformation and difficult preparation, which greatly limit energy-absorbing properties. Material range and repeatability

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