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Automobile bumper using gradient foamed aluminum

A technology of automobile bumper and aluminum foam, applied in the direction of bumper, etc., can solve the problems of poor collision ability and low strength of pure foam aluminum, and achieve the effect of improving anti-collision performance, high strength and strong energy absorption capacity

Pending Publication Date: 2021-11-19
CIVIL AVIATION UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low strength of pure foamed aluminum, the collision ability is not good

Method used

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  • Automobile bumper using gradient foamed aluminum
  • Automobile bumper using gradient foamed aluminum
  • Automobile bumper using gradient foamed aluminum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A car bumper using gradient aluminum foam, such as figure 1 As shown, it includes a bumper shell 1 made of plastic, a buffer energy-absorbing layer 2 and a bumper frame 3 , and the buffer energy-absorbing layer 2 is fixedly connected to the bumper shell 1 and the bumper frame 3 respectively. The buffer energy-absorbing layer 2 includes a composition gradient composite foam material layer 4 and a density gradient aluminum foam filling tube 5. The composition gradient composite foam material layer is made by adding a pore-forming agent by powder metallurgy, and consists of an outer aluminum foam block 6 and an inner foam aluminum block. 16 and the middle carbon nanotube reinforced aluminum foam matrix composite material 7, the inner and outer aluminum foam density is 1.08g / cm 3 , the corresponding porosity is 60%, the carbon nanotube mass fraction of the intermediate carbon nanotube reinforced aluminum foam matrix composite material is 2.5wt.%, and the porosity is the sam...

Embodiment 2

[0055] In this embodiment, the buffer energy-absorbing layer includes a functional gradient composite foam material layer and a density gradient aluminum foam filling pipe. The composition gradient composite foam material layer is made by adding a pore-forming agent by powder metallurgy, and consists of an outer aluminum foam block and an inner foam aluminum block. It is composed of carbon nanotube reinforced aluminum foam matrix composite material in the middle, and the density of aluminum foam on the outside and inside is 0.54g / cm 3, the corresponding porosity is 80%, the mass fraction of carbon nanotubes in the carbon nanotube reinforced aluminum foam matrix composite material is 2wt.%, and the porosity is 60%. The density gradient aluminum foam filling tube is made of 4 layers of density gradient aluminum foam with a porosity of 40-80% in situ filling an aluminum alloy thin-walled tube with a wall thickness of 1.5mm. The density gradually increases towards the direction of ...

Embodiment 3

[0058] In this embodiment, the buffer energy-absorbing layer includes a functional gradient composite foam material layer and a density gradient aluminum foam filling pipe. One layer of carbon nanotube reinforced aluminum foam matrix composite material and two inner layers of foamed aluminum blocks; along the direction close to the body, the density of the outer two layers of foamed aluminum is 0.54g / cm 3 , 1.08g / cm 3 , the corresponding porosity is 80% and 60%, respectively, the mass fraction of carbon nanotubes in the three-layer carbon nanotube reinforced aluminum foam matrix composite material is 2wt.%, the porosity is 60%, 40%, 60%, respectively, and the inner two layers The density of aluminum foam is 1.08g / cm 3 , 0.54g / cm 3 , corresponding to porosity of 60% and 80%, respectively. The density gradient aluminum foam filling tube is made of 4 layers of density gradient aluminum foam with a porosity of 40-80% in situ filling an aluminum alloy thin-walled tube with a wal...

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Abstract

The invention relates to the field of automobiles and particularly relates to an automobile bumper using gradient foamed aluminum. The automobile bumper comprises a bumper shell, a buffer energy absorption layer and a bumper framework, wherein the buffer energy absorption layer comprises a composite foam material layer and a foamed aluminum filling pipe; the composite foam material layer comprises an outer side pure foam aluminum layer, a carbon nano tube reinforced foam aluminum matrix composite material layer and an inner side pure foam aluminum layer which are sequentially arranged in the direction close to a vehicle body; and the foamed aluminum filling pipe is composed of a foamed aluminum in-situ filling thin-wall aluminum alloy pipe with the density changing in a gradient mode. The buffer energy absorption layer is made of a component gradient composite foam material composed of a pure foam aluminum layer and a carbon nano tube reinforced foam aluminum matrix composite layer, good buffering and energy-absorbing capacity is provided through layer-by-layer crushing, and anti-collision performance of the bumper structure is effectively improved; meanwhile, the foamed aluminum filling pipe can provide higher energy absorption capacity and stability under oblique impact at a high impact speed, impact force borne by the automobile during collision is reduced, and safety of people and the automobile is protected to the maximum extent.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to an automobile bumper using gradient aluminum foam. Background technique [0002] Aluminum foam is a new type of porous metal material. Its spatial structure characteristics make it have the characteristics of both metal and foam. Compared with traditional metal materials, aluminum foam is light in weight, high in specific strength and specific stiffness, and has good impact energy absorption. capacity and damping performance, etc. At the same time, because of its microstructure different from that of solid materials, it has many incomparable characteristics of solid materials, such as cushioning and energy absorption, electromagnetic shielding, noise reduction and sound insulation, etc. The composite foam prepared by adding carbon nanotubes to aluminum foam can give full play to the characteristics of high specific strength and high specific modulus of carbon nanotubes in the reinforc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60R19/22
CPCB60R19/22Y02T10/40
Inventor 杨旭东冯晓琳成莹邹田春
Owner CIVIL AVIATION UNIV OF CHINA
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