Development of a finite element model for Flex-PLI

Kikuchi, Yuji; Takahashi, Yukou; Mori, Fumie

Affiliations

³PSG

Abstract

A finite Element (FE) model of the next-generation flexible pedestrian leg-form impactor (Flex-PLI) developed by the Japan Automobile Manufacturers Association (JAMA) and Japan Automobile Research Institute (JARI) was developed in this study. The Flex-PLI is intended to be used in evaluating safety of car front structures against the lower limbs of pedestrians. A 3D geometry of each part was reproduced in PAM-CRASHTM based on drawings of the Flex-PLI. For material characterization, the stress-strain characteristics were determined from the results of the material tests on each individual component, with the strain rate dependency of the material taken into account. The results of the dynamic 3-point bending test for the thigh and leg and the dynamic 4-point bending test for the knee joint performed by JARI were used to validate the model. The validation results showed that the computer simulation results for the force-deflection response of the thigh and leg as well as the moment-angle response of the knee joint agreed well with the test results. Impact tests against vehicles at 40 km/h were reproduced using the model, and the results were compared with the test results. The results of the comparison showed that the kinematics of the Flex-PLI could be reproduced by the computer simulation. It was also found that the bending moment of the thigh and leg as well as the elongation of the ligament cables of the knee joint could be accurately reproduced.

Links

URL: http://www-nrd.nhtsa.dot.gov/pdf/esv/esv19/05-0287-W.pdf

Cited Works (5)

Year	Entry
1998	EEVC Working Group 17 Report: Improved Test Methods to Evaluate Pedestrian Protection Afforded by Passenger Cars. European Enhanced Vehicle-Safety Committee (EEVC); 1998.
2003	Konosu A, Tanahashi M. Development of a biofidelic flexible pedestrian legform impactor. Stapp Car Crash J. 2003;47:459-472. SAE 2003-22-0020.
2001	Konosu A, Ishikawa H, Tanahashi M. Reconsideration of injury criteria for pedestrian subsystem legform test: problems of rigid legform impactor. In: Proceedings of the 17th International Technical Conference on the Enhanced Safety of Vehicles (ESV). June 4-7, 2001; Amsterdam, The Netherlands.
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.
1999	Matsui Y, Ishikawa H, Sasaki A, Kajzer J, Schroeder G. Impact response and biofidelity of pedestrian legform impactors. In: Proceedings of the 1999 International IRCOBI Conference on the Biomechanics of Impact. September 23-24, 1999; Sitges, Spain.343-354.

Cited By (1)

Year	Entry
2007	Issiki T, Konosu A, Tanahashi M. Development of an FE biofidelic flexible pedestrian leg-form impactor (Flex-GT-prototype) model. In: Proceedings of the 20th International Technical Conference on the Enhanced Safety of Vehicles (ESV). June 18-21, 2007; Lyon, France.