Three-dimensional structure with negative Poisson's ratio characteristic and combination method thereof

A three-dimensional structure and unique technology, applied in bumpers, vehicle parts, vehicle safety arrangements, etc., can solve problems such as poor axial stability and poor energy absorption effect, and achieve convenient manufacturing, stable structure, and strong impact resistance. Effect

Active Publication Date: 2021-10-22
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structure of the traditional automotive energy-absorbing box is still a thin-walled square tube and a thin-walled round tube. The thin-walled tube can only absorb energy in one direction, and the energy-absorbing effect is poor, and the axial stability is poor during the impact process.

Method used

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  • Three-dimensional structure with negative Poisson's ratio characteristic and combination method thereof
  • Three-dimensional structure with negative Poisson's ratio characteristic and combination method thereof
  • Three-dimensional structure with negative Poisson's ratio characteristic and combination method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Such as figure 1 As shown, a three-dimensional structure with negative Poisson's ratio characteristics in this embodiment includes a plurality of three-dimensional structural units, and the three-dimensional structural units include a horizontally arranged tetrachiral structural unit and two torsion structures with the same size and structure unit; the torsional structural unit includes an upper cross bar, a lower cross bar, two upper slant bars, and two lower slant bars. The two ends of the rod are respectively connected to one ends of the two upward slanting rods, the two ends of the lower cross bar are respectively connected to one ends of the two downward slanting rods, and the other ends of the two upward slanting rods are respectively connected to the other ends of the two downward slanting rods. The horizontal projections of the two upward slanting rods and the two downward slanting rods coincide with each other, and the horizontal projections of the upper horizo...

Embodiment 2

[0070] Such as Figure 4 with Figure 5 As shown, the lengths of the four connecting rods of the tetrachiral structural unit are all b (mm), and the length of the plane connecting the connecting rod and the connecting block is t (mm); the inner diameter of the ring is r (mm); the tetrachiral structure The thickness of the unit is 2t (mm).

[0071] Such as figure 2 with image 3 As shown, the length of the upper cross bar and the lower cross bar of the torsion structural unit is L1 (mm), and the thickness is t (mm); the length of the upper inclined bar and the lower inclined bar is L2 (mm), and the height of the connecting block is 2t (mm), the width is t (mm), and the horizontal projection of the upper cross bar and the upper slant bar forms an included angle φ, and in the present embodiment, φ is 45°.

[0072] The three-dimensional structural unit can be obtained by combining the tetrachiral structural unit and the torsion structural unit in the modeling software. The ca...

Embodiment 3

[0091] Such as Figure 4 with Figure 5 As shown, the lengths of the four connecting rods of the tetrachiral structural unit are all b (mm), and the length of the plane connecting the connecting rod and the connecting block is t (mm); the inner diameter of the ring is r (mm); the tetrachiral structure The thickness of the unit is 2t (mm).

[0092] Such as figure 2 with image 3 As shown, the length of the upper cross bar and the lower cross bar of the torsion structural unit is L1 (mm), and the thickness is t (mm); the length of the upper inclined bar and the lower inclined bar is L2 (mm), and the height of the connecting block is 2t (mm), the width is t (mm), and the horizontal projection of the upper cross bar and the upper slant bar forms an included angle φ, and in the present embodiment, φ is 5°.

[0093] The three-dimensional structural unit can be obtained by combining the tetrachiral structural unit and the torsion structural unit in the modeling software. The cal...

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Abstract

The invention relates to a three-dimensional structure with a negative Poisson's ratio characteristic, which comprises a plurality of three-dimensional structure units. Each three-dimensional structure unit comprises a four-chiral structure unit and two torsion structure units; the torsion structure unit comprises an upper cross rod, a lower cross rod, an upper inclined rod and a lower inclined rod, the upper cross rod is connected with the upper inclined rod, the lower cross rod is connected with the lower inclined rod, the upper inclined rod is connected with the lower inclined rod, the horizontal projection of the upper inclined rod coincides with the horizontal projection of the lower inclined rod, and an included angle phi is formed by the horizontal projection of the upper cross rod and the horizontal projection of the upper inclined rod; the two torsion structure units are perpendicular to each other; the four-chiral structure unit comprises a circular ring and a connecting rod; one end of the connecting rod is tangent to the circular ring, and the other end of the connecting rod is connected with the connecting point of the upper inclined rod and the lower inclined rod. The invention further relates to a combination method of the three-dimensional structure with the negative Poisson's ratio characteristic. The structure is stable, can achieve the negative Poisson's ratio characteristic in multiple directions, and belongs to the field of automobile safety equipment.

Description

technical field [0001] The invention relates to the field of automobile safety equipment, in particular to a three-dimensional structure with negative Poisson's ratio characteristics and a combination method thereof. Background technique [0002] Over the years, many structures with negative Poisson's ratio properties have been developed, such as star-shaped negative Poisson's ratio structures, arrow-shaped negative Poisson's ratio structures, bow-tie Poisson's ratio structures, and chiral structures. Due to the unique properties of negative Poisson's ratio materials, which are different from ordinary materials, the shear modulus, notch resistance, fracture resistance and rebound toughness of materials have been significantly improved. The application of negative Poisson's ratio materials involves many fields. When negative Poisson's ratio materials are used to manufacture sandwich panels, they expand outward when bent to absorb more energy, which greatly improves the safety...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60R19/02
CPCB60R19/023B60R2019/026Y02T90/00
Inventor 李方义陈修杰苏良
Owner GUANGZHOU UNIVERSITY
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