Optimization of an O-EEA-energy absorber for a pedestrian protection loadcase of a vehicle front structure with HyperStudy and LS-DYNA

Nowadays the automotive industry is confronted with constantly growing demands in the field of pedestrian protection. A typical loadcase for a vehicle is the lower-leg loadcase. In such a test a testing-impactor resembling a human leg consisting of lower leg (tibia), upper leg (femur), knee-joint and surrounding tissue is accelerated on a vehicle front-structure. The structure then has to fulfill certain criteria concerning bending angle and shear displacement in the knee joint as well as deceleration of the whole impactor. To fulfill these criteria independent of the car's design energy absorption elements (e.g. foam inserts or plastic materials) are applied between bumper crossbeam and fascia. In the scope of this lecture a freely available FE-model of a car has to be converted into a condensed model of the front structure and then tested for it's applicability for an optimization. Afterward the O-EEA energy-absorber of the Novelis Deutschland GmbH which is already established in the market shall be optimized for the lower leg loadcase with Altairs HyperStudy software regarding several variables while meeting different production-orientated restrictions. Furthermore this task requires linking HyperStudy with a Linux-Cluster as well as LS-DYNA.

The Author

Alexander Froloff
Group Leader Crash Simulation
Ingenieurbüro Huß und Feickert
Im Kohlruß 1-3
65835 Liederbach, Germany