Design of Bumper Beam Structure for Pedestrian Protection and Low Speed Bumper Impact(ECE-R42).

The biggest challenge in vehicle BIW design today is to make a light, cost effective and energy absorbing structure. With the increasing competition as well as increasing customer awareness, today’s vehicle has to satisfy several aesthetic and functional requirements besides the mandatory regulatory requirements. Working on global platform is challenging in order to comply with both pedestrian protection and low speed bumper impact (ECE-R42) and, at the same time, to meet the styling intent of reducing the front overhang. Pedestrian lower leg compliance demands space between bumper member and bumper: a condition that reduces the space available for energy absorption during low speed impact (ECE-R42). Therefore, reduction in front overhang poses a problem in meeting both the requirements with limited space. This paper outlines vehicle case study in order to optimize the design of Bumper Beam structure, for complying with regulatory requirements while satisfying the styling intent. Various combinations of sections have been checked in simulations for evaluating strength, weight and cost. Research has also been done on material and thickness variations to reach an improved structure. The paper throws light on the various combinations of bumper beam structures such as pipes and sheet metal structures to prevent investment in costly process technologies such as hot forming or usage of advanced high strength steels. The result showcases a balance in cost, weight and strength for Bumper Beam.