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Material Model for Helmet Pads

[+] Author Affiliations
Timothy G. Zhang, Sikhanda S. Satapathy

US Army Research Laboratory, Aberdeen Proving Ground, MD

Paper No. IMECE2017-71528, pp. V003T04A042; 8 pages
  • ASME 2017 International Mechanical Engineering Congress and Exposition
  • Volume 3: Biomedical and Biotechnology Engineering
  • Tampa, Florida, USA, November 3–9, 2017
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5836-3


Quasi-static compression and dynamic impact experiments were conducted on comfort and stiff foam material used in the helmet pads. The time histories of displacement and total force applied to the foam were measured, from which the engineering stress-strain curves were calculated. At high rate, the material did not reach equilibrium and the calculated stress-strain curves may not represent the actual stress-strain response. Numerical models were developed in LS-DYNA to calibrate a material model for the comfort and stiff foams. The rate-dependent foam material response was captured reasonably well in the model.



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