Variable-thickness-gradient negative poisson ratio automobile buffering and energy-absorbing structure and optimization method thereof

A negative Poisson's ratio, energy-absorbing structure technology, applied in design optimization/simulation, special data processing applications, instruments, etc.

Active Publication Date: 2017-10-10
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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Problems solved by technology

[0004] Aiming at the deficiencies in the design process of the existing automotive buffer energy-absorbing structure, the present invention proposes a variable-thickness gradient negative Poisson's ratio automotive buffer energy-absorbing structure and its optimization method

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  • Variable-thickness-gradient negative poisson ratio automobile buffering and energy-absorbing structure and optimization method thereof

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Embodiment Construction

[0055] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0056] Such as figure 1 As shown, the present invention discloses a vehicle buffer energy-absorbing structure with variable thickness and gradient negative Poisson's ratio. The structures are all composed of three-dimensional concave hexagonal unit cell arrays.

[0057] The automobile cushioning energy-absorbing structure is arranged between the outer skin of the automobile bumper and the bumper beam, and is fixed on the automobile bumper beam through the installation card hole.

[0058] Such as figure 2 As shown, the thickness of the unit cells in the first to third layers of negative Poisson’s ratio structures is distributed in a regular gradient, and the ratio of the thickness of the unit cells in the second layer of negative Poisson’s ratio structures to that of the first layer of negative Poisson’s ratio structures is The preset first grad...

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Abstract

The invention discloses a variable-thickness-gradient negative poisson ratio automobile buffering and energy-absorbing structure and an optimization method thereof. The automobile buffering and energy-absorbing structure is formed by a variable-thickness-gradient negative poisson ratio structure, and the negative poisson ratio structure is formed by three-dimensional inwardly-sunken hexagon unit-cells in an array mode; in the longitudinal direction of an automobile, and three layers of unit-cells are distributed, the thickness gradients among the layers are different; and the variable-thickness-gradient negative poisson ratio automobile buffering and energy-absorbing structure is located between a bumper outer skin and a bumper cross beam, and mounted on the automobile bumper cross beam through mounting clamping holes, and mainly when the automobile is collided, the variable-thickness-gradient negative poisson ratio automobile buffering and energy-absorbing structure plays the role of energy absorbing and buffering. The invention further discloses a design method of the automobile buffering and energy-absorbing structure of the variable-thickness-gradient negative poisson ratio structure, the variable-thickness-gradient distribution character of the negative poisson ratio structure can be designed according to design objectives and requirements through a multi-subject and multi-objective cooperative optimization method, and the positive effects on protection to legs of goers outside the automobile and the crashworthiness of an automobile body are achieved.

Description

technical field [0001] The invention relates to the field of passive safety of automobiles, in particular to an automobile buffer energy-absorbing structure with variable thickness gradient and negative Poisson's ratio and an optimization method thereof. Background technique [0002] Modern automobiles are developing in the direction of informatization, intelligence, and refinement, and the detailed design of some automobiles is becoming more and more important. In order to reduce the impact damage to the car body in the event of a frontal collision, the buffer energy-absorbing structure of the car is used in the car bumper system. As more and more attention is paid to pedestrian safety, the energy-absorbing structure has been given the important task of reducing pedestrian injuries, so the energy-absorbing structure originally made of foam has been difficult to meet the protection requirements for pedestrians. [0003] In order to make the buffer energy-absorbing structure...

Claims

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Application Information

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IPC IPC(8): B60R19/18G06F17/50
CPCB60R19/18G06F30/23G06F2119/06Y02T10/40
Inventor 王春燕王崴崴赵万忠
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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