Composite material negative Poisson's ratio structure energy absorption box and design method thereof

Abstract

The invention discloses a composite material negative Poisson's ratio structure energy absorption box and a design method thereof. The method includes compounding and filling a metal negative Poisson's ratio structure and a non-metal matrix material in an energy absorption box body; establishing a self-adaptive parameterized model of the composite material negative Poisson's ratio structure energy absorption box; changing the porosity of the matrix material and the thickness of the negative Poisson's ratio structure to carry out finite element analysis on the whole energy absorption box and the inner core thereof; carrying out design variable sampling by utilizing an optimal Latin hypercube sampling technology; establishing an approximate model between a design variable and an optimization target by using a double-response method; and performing multi-objective optimization design by applying a second-generation non-dominated genetic sorting genetic algorithm to obtain the high-robustness energy absorption box. The specific energy absorption of the energy absorption box is improved, the peak collision impact force of the energy absorption box is reduced, and the front collision passive safety performance of an automobile is greatly improved.

Description

technical field [0001] The invention relates to the technical field of automobile safety, in particular to an energy-absorbing box with a composite material negative Poisson's ratio structure and a design method thereof. Background technique [0002] As an energy absorbing part, the energy absorbing box is generally installed between the front beam of the front bumper and the longitudinal beam of the vehicle body, and is connected with the two parts. In a vehicle collision accident, on the one hand, the energy-absorbing box can absorb the collision energy of the front part of the car bumper and the front beam, absorb energy through collapse and deformation, and reduce the damage caused by the collision to the front of the car body; on the other hand, As a mechanical part, the crash box can transmit the collision force from the front to the longitudinal beam of the body structure, thereby dispersing the concentrated force and improving the passive safety performance of the ve...

AI Technical Summary

Problems solved by technology

[0003] Due to the unreasonable design and the limitations of traditional materials, the energy absorbed and transferred by the traditional energy-absorbing box in the frontal collision of the car is insufficient, and the energy absorption cannot be maximized.

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