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Research on Energy-Absorption Ability of Foam Aluminum and Its Application in Automotive Bumper

Author: LiuChunMeng
Tutor: ZhaoGuiFan
School: Harbin Institute of Technology
Course: Vehicle Engineering
Keywords: Aluminum foam Bumper LS-DYNA Energy absorption
CLC: U465
Type: Master's thesis
Year: 2011
Downloads: 278
Quote: 0
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Abstract


With the rapid development of automobile industry, the number of cars in urban road more and more, it also brings traffic safety issues. In order to minimize road car in the city after the collision occurred in low maintenance costs, car bumpers on a collision course should have good energy absorption effect. In this paper, LS-DYNA new functional materials studied energy absorption of aluminum foam discussed in automotive bumper energy absorbing cushioning effect, and aluminum foam filled tubes bumper and the general energy-absorbing bumpers compared the effects of . This article identifies the evaluation criteria bumper collision, and according to the standard bumper collision energy absorbing characteristics were evaluated. According to the structural characteristics of aluminum foam, the establishment of aluminum foams with different densities finite element model for the impact of the use of LS-DYNA simulation, aluminum foams with different densities of impact energy absorption curves and curves are compared with experimental data to verify the finite element model and the simulation accuracy. Simulation results show that aluminum foam is a good energy-absorbing material, the absorption efficiency can reach 70%, and a density of 0.56g/cm ~ 3 relative to other aluminum foam density aluminum foam has superior energy absorption effect and mitigate the impact of the results. The text of the aluminum foam filled tubes and ordinary hollow tube in the axial compression energy absorption during a comparative analysis showed that the absorption of aluminum foam filled tubes can be better than ordinary hollow tube. Discussed under different conditions of aluminum foam filled tubes energy absorption effect, carried out with different thickness and different cross-sectional shapes, different fill tube materials, different lengths of aluminum foam filled tubes filled energy absorbing effect of a comparative analysis, obtained relatively better absorption of aluminum foam filled tubes parameters. Identified in the application of automotive bumper aluminum foam filled tubes parameters, the parameter with LS-DYNA aluminum foam filled tubes under the hollow tube and the general conduct comparative analysis of the energy-absorbing characteristics. Compared the application of rectangular aluminum foam filled tubes and the general round hollow tubes of energy absorbing bumper results showed that under the same weight aluminum foam filled tubes than ordinary hollow tube bumper bumper maximum energy absorption improved by 71%. In this paper, energy absorption of aluminum foam as the main research content, proved aluminum foam filled tubes in energy absorbing bumpers and weight effects on both a significant advantage for the aluminum foam in automotive bumpers provide a basis for the application for the design of better energy absorption effect of the bumper to provide a reference.

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