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Finite Element Modeling of Structural Foam and Head Impact Interaction with Vehicle Upper Interior
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English
Abstract
This paper first describes an experimental analytical approach and numerical procedures used to establish crushable foam material constants needed in finite element (FE) analysis. Dynamic compressive stress-strain data of a 2 pcf Dytherm foam, provided by ARCO Chemical, is used to determine the material parameters which appears in the foam constitutive equation. A finite element model simulating a 15 mph spherical headform impact with a foam sample 6 in. x 6 in. x 1 in. fixed against a rigid plate is developed. The predicted force-deflection characteristic is validated against test data to characterize the initial loading and final unloading stiffnesses of the foam during impact.
Finite element modeling and analysis of 15 mph spherical headform impact with component sections of upper interior structures of a passenger compartment is presented. The FE model validations are carried out through very good correlations of the predicted headform responses to those obtained from laboratory tests of spherical headform impact with vehicle components in unpadded and padded configurations. Such techniques can demonstrate the capacity of a well-defined model to help predict headform responses and the effect of adding foam padding and structural design changes on so called Head Injury Criteria (HIC). It is concluded in this paper that the application of finite element technique to head impact design issues has great potential for understanding structural design attributes and their effect on HIC measurements.
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Authors
Citation
Barbat, S. and Prasad, P., "Finite Element Modeling of Structural Foam and Head Impact Interaction with Vehicle Upper Interior," SAE Technical Paper 950885, 1995, https://doi.org/10.4271/950885.Also In
Advances in Occupant Protection Technologies for the Mid-Nineties
Number: SP-1077; Published: 1995-02-01
Number: SP-1077; Published: 1995-02-01
References
- Evans, F. G. Lebow, M. Lissner, H. R. “Experimental Studies on the Relation Between Acceleration and Intracranial Pressure Changes in Man,” Surgery, Gynecology, and Obstetrics 113 329 338 1960
- Prasad, P. Mertz, H. J. “The Position of The United State Delegation to the ISO Working Group 6 on the Use of HIC in the Automotive Environment,” 29th Stapp Car Crash Conf. Proc. SAE Paper Number 851246 1985
- Monk, M. W. Sullivan, L. K. “Energy Absorption Material Selection Methodology For Head/A-Pillar,” Stapp Car Crash Conf. Proc. SAE Paper Number 861887 October 1986
- DiMasi, F. P. Volpe National Transportation Systems Center “Three Dimensional Finite Element Modeling of Head Impacts With Vehicle Upper Interiors.” Technical Memorandum No. TSC-HS-876-4 Washington, D. C. U. S. Department of Transportation September 1988
- DiMasi, F. Eppinger, R. H. Gabler H. C., III Marcus, J. H. “Simulated Head Impacts With Upper Interior Structures Using Rigid and Anatomic Brain Model,” Auto and Traffic Safety, U.S. DOT 1 1 Summer 1991
- PAM - CRASH Manual Engineering System International France
- Krieg, R. D. “A Simple Constitutive Description For Soils and Crushable Foam,” Sandia National Laboratories Albuguergue, New Mexico 1972
- Ramanujam, N. N. Daniel, R. P. Hultman, R. W. “Preliminary Free - Motion Headform Testing of Vehicle Upper Interior Surfaces,” SAE Paper Number 911216 May 1991
- Nightingale, R.W. McElhaney, J. H. Richardson, W. J. Best, T. M. myers, B. S. “A Summary of Head and neck Impact Injury Biomechanics.” Second World conference on Injury Control Atlanta, Georgia May 1993