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Effects of Unloading and Strain Rate on Headform Impact Simulation
Technical Paper
2004-01-0738
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The current paper presents improvements of a previous single-degree-of-freedom lumped parameter model with a nonlinear spring that could be used for preliminary design of headform impact safety countermeasures for normal impact with negligible headform rotation.
The unloading taking place along the elastic path has been dispensed with and a parabolic unloading path may yield more realistic force-deformation and deceleration-time behaviors when compared with test results. The effects of the modified unloading behavior on HIC(d) are illustrated with examples. Additionally, a new velocity-dependent yield force criterion is adopted for the spring element to represent strain rate sensitive countermeasures. It is observed that inclusion of strain rate effect can either increase or decrease predicted HIC(d) when compared with using only quasi-static yield force.
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Citation
Deb, A., Biswas, U., and Chou, C., "Effects of Unloading and Strain Rate on Headform Impact Simulation," SAE Technical Paper 2004-01-0738, 2004, https://doi.org/10.4271/2004-01-0738.Also In
Safety Test Methodology, and Accelerated Testing and Vehicle Reliability
Number: SP-1879; Published: 2004-03-08
Number: SP-1879; Published: 2004-03-08
References
- Deb A. Chou C.C. Barbat S.D. “An analytical study of headform impact protection space for a rigid target” SAE Paper No. 2000-01-0608
- Deb A. Chou C.C. “Headform impact safety design through simulation and testing” SAE Paper No. 2003-01-1386
- Deb A. Ali T. “A lumped paramter-based approach for simulation of headform impact with countermeasures” International Journal of Impact Engineering
- Chou C.C. Nyquist G.W. “Analytical studies of the Head Injury Criterion (HIC)” SAE Paper No. 740082
- U.S. Department of Transportation, NHTSA 1995 “Laboratory test procedure for FMVSS 201” TP-201UU-00, Safety Assurance OVSC Washington, DC