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Negative poisson ratio structural component based on inner sunken hexagonal unit

A technology of negative Poisson's ratio and structural components, which is applied in the field of negative Poisson's ratio structural components based on concave hexagonal elements, can solve the problem of insufficient lateral stiffness and strength of three-dimensional structures, and cannot meet the energy absorption requirements of energy-absorbing boxes, etc. problems, to achieve good energy absorption characteristics, technical means are simple and easy to implement, and the effect of improving energy absorption efficiency

Pending Publication Date: 2018-05-29
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent 201611222807 discloses an energy-absorbing box filled with a negative Poisson’s ratio structure inside, but the unit cell in this patent is formed by connecting two concave hexagons at the vertical cell wall, so that the expanded three-dimensional Insufficient lateral rigidity and strength of the structure cannot meet the energy absorption requirements of the energy-absorbing box in an offset collision

Method used

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  • Negative poisson ratio structural component based on inner sunken hexagonal unit
  • Negative poisson ratio structural component based on inner sunken hexagonal unit
  • Negative poisson ratio structural component based on inner sunken hexagonal unit

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preparation example Construction

[0025] The preparation material of the supporting cell arm and the bending rib is metal, plastic, foam, ceramic or composite material.

[0026] The supporting cell arms and bending ribs are made by stamping, extrusion or 3D printing.

[0027] The present invention also provides an energy-absorbing box prepared by a negative Poisson's ratio structural part based on a concave hexagonal multicellular unit, including a metal shell, a negative Poisson's ratio structural core and a rear mounting plate, and a negative Poisson's ratio structure The inner core is composed of negative Poisson's ratio structural parts, which are arranged inside the metal shell, and the rear mounting plate is fixedly connected with the longitudinal beam of the vehicle.

Embodiment 1

[0030] A negative Poisson's ratio structural component based on concave hexagonal multicellular units, including multiple unit cell structures; as image 3 The unit cell structure is composed of two concave hexagons, the concave hexagons are left and right symmetrical dovetail shapes, the left and right two equal-length vertical sides are supporting cell arms 301, the length is H, and the left and right four equal-length hypotenuses is the bending rib 302, the length is L, the angle between the supporting cell arm and the bending rib is θ and θ2·Cosθ·L. Two hexagons are arranged orthogonally and intersect at two concave corner vertices, thus forming a complete unit cell structure.

[0031] Multiple unit cell structures are connected to each other by sharing a support cell arm in two horizontal directions, so as to extend in the horizontal direction to form a continuous unit layer. In the vertical direction, multiple unit layers are connected to each other by sharing curved ri...

Embodiment 2

[0037] Figure 7 An energy-absorbing box based on the negative Poisson's ratio structure of the concave hexagonal unit of the present invention is shown. Including the metal shell 701 of the energy-absorbing box, the inner core 702 of the negative Poisson's ratio structure and the rear mounting plate 703, one end of the metal shell 701 is fixedly connected with the automobile anti-collision beam, the other end is fixedly connected with the rear mounting plate 703, and the rear mounting plate 703 is connected with the rear mounting plate 703 The car stringer is fixed. The metal shell is a hollow box filled with a negative Poisson's ratio inner core 702 .

[0038]The metal shell 701 is stamped and formed from a 1.2 mm thick aluminum plate, and is welded by spot welding technology into a rectangular cuboid energy-absorbing box structure, with dimensions of 170 mm in length, 80 mm in width, and 100 mm in height. The two end faces of the metal shell 701 are provided with flanging...

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Abstract

The invention discloses a negative poisson ratio structural component based on an inner sunken hexagonal multi-cell unit. The negative poisson ratio structural component comprises a plurality of unitcell structures, each of the unit cell structures consists of two inner sunken hexagons, the inner sunken hexagons are in a left-right symmetric dovetail shape, and every two inner sunken hexagons arearranged in an orthogonal mode and intersect at two concave angle apexes to form a complete unit cell structure; the multiple unit cell structures are connected with each other horizontally in both directions by sharing one support cell arm, and are extended in the horizontal direction to form a continuous unit layer; and a plurality of unit layers are connected with each other in the vertical direction by sharing curved ribs to form a multi-layered cross-aligned inner sunken honeycomb-shaped three-dimensional negative poisson ratio structure. According to the negative poisson ratio structural component based on the inner sunken hexagonal multi-cell unit, a significant negative poisson ratio effect is achieved, higher elastic modulus, shear modulus and storage modulus can be generated when loaded, better rebound toughness and fracture resistance are achieved and improved with the enhancement of the negative poisson ratio effect.

Description

technical field [0001] The invention relates to a negative Poisson's ratio structural component, in particular to a negative Poisson's ratio structural component based on a concave hexagonal unit. Background technique [0002] The concept of Poisson's ratio was first discovered and proposed by the French scientist Poisson (Simon Denis Poisson), which means that when the material is subjected to unidirectional tension or compression, the material is elongated (or shortened) along the load direction. Shortening (or elongation) deformation occurs in the direction perpendicular to the load. The negative value of the ratio of the strain ε in the vertical direction to the strain ε in the load direction is called the Poisson's ratio of the material. Denote Poisson's ratio by μ, then [0003] For most materials, it is generally accepted that if it is stretched (compressed) in one direction, it will shrink (expand) in transverse cross-section, as figure 1 As shown, so the Poisso...

Claims

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Application Information

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IPC IPC(8): B60R19/34
CPCB60R19/34Y02T90/00
Inventor 王陶王良模王亚进江怡李振陈刚
Owner NANJING UNIV OF SCI & TECH
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