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The bumper absorber is the part located behind the decorative
plastic bumper which takes up energy generated during collision. The whole front-end module (i.e. bumper energy absorber, air guides and overmolded car fender- and bumper skirt- air grilles) protect all mechanical components behind it. The technology
and material selection used in the manufacturing of the rear bumper shock absorber have also a significant impact on the pedestrian protection in case of a collision.
Renault was looking for a light, less rigid plastic solution to have parts more favorable to the pedestrian NCAP crash tests (low speed 30 km/h). From the experience of our foam experts in Knauf Industries Automotive division, and also from other industries, we immediately could recommend the
expanded polypropylene (EPP) which is shock-absorbent and extremely light at the same time. The closed-cell expanded material is widely known for its successful application in
passive safety systems. Based on the complexity of the parts, our R&D defined the appropriate characteristics of the material needed for this
specific program.
Current Trends in Bumper Design for Pedestrian Impact
New vehicle bumper design for pedestrian protection during Impact