Three-dimensional negative Poisson's ratio structure, additive manufacturing method, 3D printer and application

Abstract

The invention belongs to the technical field of metamaterial structures, and discloses a three-dimensional negative Poisson's ratio structure, an additive manufacturing method, a 3D printer and an application, and the isotropic three-dimensional negative Poisson's ratio structure is obtained by arraying a plurality of basic unit bodies. Each unit body is provided with a hollow inner concave body and six connecting bridges; eight vertexes of the hollow inner concave body are in the shape of a triangular bearing table in three directions respectively, and the middles of the six inner concave surfaces are in the shape of a square bearing table; and one ends of the six connecting bridges are connected with the square bearing table in the middles of the inner concave surfaces, and the other ends extend out of the hollow inner concave bodies. The three-dimensional negative Poisson's ratio structure with the isotropic height in each direction is highly symmetrical in each direction, does not show mechanical property difference due to different directions, has the characteristics of isotropic height in each direction and good multi-working-condition penetration resistance, and can show a negative Poisson's ratio effect in each direction.

Description

technical field [0001] The invention belongs to the technical field of metamaterial structures, and in particular relates to a three-dimensional negative Poisson's ratio structure, an additive manufacturing method, a 3D printer and applications. Background technique [0002] At present, with the continuous improvement of the running speed of the vehicle, people put forward higher requirements for its driving safety. Especially in terms of passive safety design, as the last safety barrier of the vehicle, it plays a very critical role in ensuring the safety of the occupants in the event of a collision accident in the vehicle. However, the crash conditions are very complex, such as high-speed compression, shearing and penetration, etc. Especially in the case of high speed and heavy load, the crashworthiness of the vehicle body structure is the most important performance related to its passive safety. In addition, while considering the safety design, its own lightweight level c...

AI Technical Summary

Problems solved by technology

[0004] Through the above analysis, the existing problems and defects of the existing technology are: most of the existing negative Poisson’s ratio cellular lattice structures can only show the negative Poisson’s ratio effect in two directions, that is, the two-dimensional plane, and a small part of the three-dimensional Even if the negative Poisson's ratio structure can show a three-dimensional negative Poisson's ratio, it is difficult to achieve the best anti-penetration performance in all directions, and it is difficult to apply to complex and changeable penetration conditions.

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