Offset impact behaviour of bumper beam–longitudinal systems: numerical simulations

Abstract

The paper presents the results from numerical simulations of bumper beam-longitudinal systems subjected to 40% offset impact loading. Numerical simulations were carried out with the non-linear finite element code LS-DYNA, searching for an efficient, numerically robust and accurate representation of the observed system behaviour. A comparative study of an industrial-like modelling procedure and another procedure incorporating a user-defined material model has been performed. In the latter procedure, the material model consists of state-of-the-art anisotropic plasticity, an isotropic strain and a strain-rate hardening rule as well as some ductile fracture criteria. Both shell and solid elements were utilized in discretizing the bumper beam-longitudinal set-up. Numerical crash results revealed good agreement with the experiments with respect to overall deformation mode and energy dissipation. The simulations were capable of giving relatively accurate prediction of the collapse mode found in the experimental tests, except for the bumper beam-longitudinal system with AA7003-T1 longitudinals. Sensitivity studies were performed considering both physical and numerical parameters. The physical parameters were strain-rate effects and the heat-affected zone, whereas the numerical parameter considered was adaptive meshing.

A Study of the Deflections of Metal Road Guardrail Elements

“…Th e research by Kokkula et al (2006) presents the results of numerical simulations of bumper beam systems, the important structures of an automobile that provide passenger protection from front and rear collisions. Th is investigation explores bumper beamlongitudinal systems that are subjected to 40% off set impact loading.…”

Correlations between Axial and Oblique Loaded Column

“…Automotive structures are designed to sustain impact loading in diverse crash directions such as frontal, lateral and rear impact. Above all crash events, frontal collision was identified as the most common accidents on the road and gives rise to high portion of death [1][2]. Thus, it is vital to have an efficient energy absorbing structure on the front side of an automobile.…”

Evaluation of constitutive models for textured aluminium alloys using plane-strain tension and shear tests

“…For structural analysis of extruded aluminium alloy components, e.g. in FE simulation of formability, plastic forming and crashworthiness, constitutive models accounting for the plastic anisotropy have been used in several studies [9][10][11][12][13][14]. Over the years, many phenomenological yield criteria have been proposed, attempting to represent the plastic anisotropy observed in metals and alloys, e.g.…”