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Energy-absorbing box based on three-dimensional structure core of concave polyhedron with negative Poisson's ratio

A negative Poisson's ratio and three-dimensional structure technology, applied in the field of energy-absorbing boxes, can solve problems such as insufficient compression, insufficient deformation stability, and uncontrollable pedestrian injuries, etc., to achieve improved energy absorption effects, save maintenance costs, and good pedestrian protection performance Effect

Active Publication Date: 2022-04-19
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of energy-absorbing box filled with fiber-reinforced composite materials has problems such as insufficient deformation stability, insufficient compression, and uncontrollable damage to pedestrians in the event of a car collision.

Method used

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  • Energy-absorbing box based on three-dimensional structure core of concave polyhedron with negative Poisson's ratio
  • Energy-absorbing box based on three-dimensional structure core of concave polyhedron with negative Poisson's ratio
  • Energy-absorbing box based on three-dimensional structure core of concave polyhedron with negative Poisson's ratio

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Effect test

Embodiment 1

[0024] combine figure 1 with figure 2 , an energy-absorbing box based on a concave polyhedral negative Poisson's ratio three-dimensional inner core, including a front mounting plate 1, a rear mounting plate 2, an energy-absorbing box body 3 and a concave polyhedron negative Poisson filled in the inner cavity of the box than the three-dimensional structure inner core4. The energy-absorbing box body 3 is formed by cold stamping of a high-strength alloy steel plate with a thickness of 1.2 mm. At the same time, it is welded by spot welding technology to form a closed thin-walled box structure with a rectangular cross-section. The length of the box body is 160 mm, and the width and height of the section are respectively 280mm and 280mm. The box body 3 of the energy-absorbing box is provided with two concave crush grooves 301 at the trisector of the axial length. The crush grooves 301 run along the surface of the box body 3. The width of the two crush grooves 301 is the same as 6...

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Abstract

The invention discloses an energy-absorbing box based on a three-dimensional structure inner core of a concave polyhedron with negative Poisson's ratio. The box body and the three-dimensional inner core of the concave polyhedral negative Poisson's ratio structure filled in the inner cavity of the box; the inner core is formed by arranging and connecting multiple concave polyhedral negative Poisson's ratio unit cell structures in a three-dimensional direction. The energy-absorbing box of the present invention combines the negative Poisson's ratio three-dimensional structure, so that the energy-absorbing box has a negative Poisson's ratio and stiffness enhancement characteristics in the impact direction, which can simultaneously improve the energy-absorbing effect under multiple working conditions, and improve the performance of the vehicle. crash safety performance.

Description

technical field [0001] The invention relates to the field of crashworthiness design of automobile structures, in particular to an energy-absorbing box based on a three-dimensional structure inner core of a concave polyhedron with negative Poisson's ratio. Background technique [0002] The front bumper system of a car is the most important part of the passive safety design of a car. Its purpose is to achieve the following functions in the event of a frontal collision: When a car-person accident occurs, the system should minimize the impact force to eliminate the impact on the legs of pedestrians. And knee injuries; in the event of a car-car or car-thing accident, the system can control the deformation of the parts as much as possible in a smaller area to protect the remaining important parts and reduce follow-up maintenance costs. The energy-absorbing box is an important energy-absorbing part of the car's front bumper system, which is located between the bumper beam and the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60R19/34
Inventor 王陶陆嘉伟王良模陈刚
Owner NANJING UNIV OF SCI & TECH
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