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Exploring an Alternate Material for Lower Bumper Stiffener

Shreyas S. Kashyap, R. Rajashekhar, Arun K. Murthy


This paper is intended to explore an alternate material for the lower bumper stiffener that is used as a countermeasure for the pedestrian protection during the car–pedestrian impact incident. The material that is currently used is the ethylene propylene diene monomer (EPDM) in polypropylene (PP) composite. Due to various disadvantages of this material, there is a need to explore an alternate material that satisfies the pedestrian lower leg impact criteria. Another material that has a better response than the EPDM–PP material is the GF-PA6 composite material which is found superior for this application but has some mechanical disadvantages. Hence there was a need to explore an alternate material for the lower bumper stiffener. The scope of this paper is to explore an alternate material which is cost-effective and at the same time possesses required mechanical properties to satisfy the pedestrian lower leg impact conditions. Many materials were identified based on the required conditions from the selection of material knowledge and a few were shortlisted. The best material was selected by the materials experts to carry out further analysis. This project will try to prove that the decided material is the best choice for the lower bumper stiffener.

Keywords: ACL, GTR, lower bumper stiffener, lower leg impactor, MCL, NCAP, PCL, pedestrian protection, tibia moments

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