A self-adaptive energy absorber for improved pedestrian safety and low-speed damage requirements

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A self-adaptive energy absorber for improved pedestrian safety and low-speed damage requirements

Wu, James / Altenhof, William / Bhattacharjee, Sudip / Sundararajan, Srinivasan / Magliaro, John

Bumper performance under low-speed impacts and pedestrian-to-vehicle impacts are regulated in the United States by Regulation Part 581 and ECE 127/GTR 9, respectively. These regulations possess a contradictory set of requirements. An ideal bumper structure should be stiff for the former scenario while exhibiting a softer response for the latter. Several energyabsorbing structures capable of passively adapting their mechanical responses were investigated using finite element modelling with complementary validation tests. The preferred structure consisted of a rectangular array of trapezoidal cells which buckle under single-cell impacts while resisting lateral deformation and increasing the structural stiffness under large-area impacts. A geometric study of this dissipater demonstrated the potential to increase total energy absorption by 37.3% by adding crossbars between adjacent cells. Additionally, a parametric study identified the upper cell angle and the ratio between wall thicknesses as critical parameters to consider when tailoring the mechanical response.

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Dokumentinformationen

Titel :

A self-adaptive energy absorber for improved pedestrian safety and low-speed damage requirements

Beteiligte:

Wu, James (Autor:in) / Altenhof, William (Autor:in) / Bhattacharjee, Sudip (Autor:in) / Sundararajan, Srinivasan (Autor:in) / Magliaro, John (Autor:in)

Erschienen in:

International Journal of Crashworthiness ; 25 , 1 ; 74-94

Erscheinungsdatum :

2020-01-02

Format / Umfang :

21 pages

ISSN :

1358-8265 , 1754-2111

DOI :

https://doi.org/10.1080/13588265.2018.1524546

Medientyp :

Aufsatz (Zeitschrift)