Responses of the flexible legform impactor in car impacts

Takahashi, Yukou; Imaizumi, Iwao; Asanuma, Hiroyuki; Ikeda, Miwako

Affiliations

¹Honda R&D Co., Ltd. Automobile R&D Center in Japan

Abstract and keywords

The goal of this study was to clarify how well the impact responses of the human lower limb are represented by the Flexible Legform Impactor (FlexPLI) in terms of injury measure time histories in car impacts to obtain insight into the applicability and limitation of the legform. 18 simplified vehicle models were employed to run impact simulations at 40 km/h and compare injury measure time histories between human and FlexPLI FE models. Additional impact simulations were conducted in the same impact conditions to identify factors for the difference in the magnitude of the secondary peak of the tibia bending moment identified in the comparisons. The effects of the upper body, the material characteristics of the bone and the mass distribution between the bone and the flesh/skin were individually investigated. The results of the additional simulations showed that the mass distribution between the bone and the flesh/skin most significantly contributed to the difference in the secondary peak of the tibia bending moment, while the other two factors showed a smaller contribution compared to the mass distribution.

Keywords: Pedestrians, FlexPLI, Human FE Model, Tibia Bending Moment, Secondary Peak

Links

URL: http://www.ircobi.org/downloads/irc13/pdf_files/93.pdf

Cited Works (4)

Year	Entry
2009	Konosu A, Issiki T, Takahashi Y. Evaluation of the validity of the tibia fracture assessment using the upper tibia acceleration employed in the TRL legform impactor. In: Proceedings of the 2009 International IRCOBI Conference on the Biomechanics of Impact. September 9-11, 2009; York, UK.251-267.
2012	Takahashi Y, Ikeda M, Imaizumi I, Kikuchi Y, Takeishi S. Validation of pedestrian lower limb injury assessment using subsystem impactors. In: Proceedings of the 2012 International IRCOBI Conference on the Biomechanics of Injury. September 12-14, 2012; Dublin, Ireland.304-315.
2007	Konosu A, Issiki T, Tanahashi M, Suzuki H. Development of a biofidelic flexible pedestrian legform impactor type GT (Flex-GT). In: Proceedings of the 20th International Technical Conference on the Enhanced Safety of Vehicles (ESV). June 18-21, 2007; Lyon, France.
2001	Takahashi Y, Kikuchi Y. Biofidelity of test devices and validity of injury criteria for evaluating knee injuries to pedestrians. In: Proceedings of the 17th International Technical Conference on the Enhanced Safety of Vehicles (ESV). June 4-7, 2001; Amsterdam, The Netherlands.

Cited By (2)

Year	Entry
2015	Isshiki T, Konosu A, Takahashi Y. Analysis of the causes of differences in impact responses between a human lower limb and the flexible pedestrian legform impactor under low and high bumper vehicle impact situations. In: Proceedings of the 2015 International IRCOBI Conference on the Biomechanics of Injury. September 9-11, 2015; Lyon, France.401-413.
2016	Takahashi Y, Asanuma H, Imaizumi I. Effectiveness of a test procedure for pedestrian lower limb protection in pedestrians of various sizes. In: Proceedings of the 2016 International IRCOBI Conference on the Biomechanics of Injury. September 14-16, 2016; Malaga, Spain.800-812.