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Load Distribution by Rear Bumper Beam in FMVSS 301R Test Protocol

Article of Honda R&D Technical Review Vol.32 No.1


In the present research, technology was established for compliance with Federal Motor Vehicle Safety Standard (FMVSS) 301R, which is a US regulation addressing rear-end collisions. The FMVSS 301R test procedure is an offset impact test using a deformable impact barrier. In offset impact tests, there is a large difference in load input between left and right frames, and there is less deformation in the non-collision-side frame, meaning the side that does not impact with the barrier. Attention was therefore focused on the rear bumper beam, and steps were taken to increase the energy absorption of the non-collision-side frame by having the load from the barrier transferred equally to both frames. The rear bumper beam was structured so that the load input from impact with the barrier would become symmetrical. The stretch bending manufacturing method was used for practical implementation of this concept, and the beam was shaped so that it could be located within the design space of mass-production vehicle. Verification was conducted using a prototype that supposed mass production, demonstrating that the difference in input between the left and right frames, which formerly was large, could be reduced and a more nearly symmetrical load distribution achieved.


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Author (organization or company)

Atsushi HASEGAWA(Automobile Center)、Takayuki FUJII(Automobile Center)、Norikazu MATSUURA(Automobile Center)、Tomohiro SHIMIZU(BENTELER Automotive K.K.)、Yusuke MIURA(SOLIZE Engineering Corporation)

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