Evaluation of Safety of Helmets Using a Featureless Hybrid III Headform

The authors discuss a proposed new design procedure, including simulation testing, for head impact protection for vulnerable road users, such as pedestrians and riders of two-wheeled vehicles. The new procedure would mount a helmet on a featureless Hybrid III headform. In accordance with US vehicle safety standard FMVSS 201, the headform would assess upper interior head impact safety. During testing, a 6 m/s (13.5 mph) impact velocity was used when the helmet-headform system struck a rigid target to determine a helmet's effectiveness as a countermeasure for severe head injury risk minimization. Testing results are measured by Head Injury Criterion (HIC) with a helmet efficacy judging threshold limit (HICd) of 1,000 applied. A validated LS-DYNA model aids in demonstrating the proposed procedure, with a helmet model of a protective energy-absorbing foam padding of a given thickness bonded to the inner surface of a General Electric plastic-based shell. Rigid surface impact simulation results show an acceptable sample HICd value, and acceptable helmet safety design, is possible if the shell is 3-4 mm thick and the foam padding is suitably strong and minimally 35-40 mm thick.

  • Availability:
  • Authors:
    • Deb, A
    • Biswas, U
    • Ruan, J
    • Gupta, N K
  • Publication Date: 2006


  • English

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  • Accession Number: 01045388
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 14 2007 11:44AM