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Porcine As a Training Module for Head and Neck Microvascular Reconstruction
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Implications of head and neck restraint test repeatability for specification improvement.

John P Patalak1,2,3, Matthew G Harper3, Joel D Stitzel1,2

  • 1a Wake Forest University School of Medicine , Winston-Salem , North Carolina.

Traffic Injury Prevention
|July 23, 2019
PubMed
Summary

Implementing standardized test setup constraints significantly improves the repeatability of head and neck restraint system (HNR) evaluations using the SFI 38.1 protocol. This enhanced consistency is crucial for accurately assessing safety device performance in motorsports.

Keywords:
Head and neck restraintNASCARdriver restraintmotorsportseat belt

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Area of Science:

  • Biomechanics and Motorsports Safety Engineering
  • Impact dynamics and injury prevention

Background:

  • National Association for Stock Car Auto Racing (NASCAR) mandates Head and Neck Restraint Systems (HNRs) compliant with SFI Foundation, Inc. (SFI) 38.1 since 2005.
  • HNRs are designed to mitigate neck loads and head kinematics during frontal impacts.
  • The SFI 38.1 specification provides a standardized dynamic sled test procedure for HNR evaluation.

Purpose of the Study:

  • To evaluate the repeatability of the existing SFI 38.1 sled test setup.
  • To investigate the influence of a polyester seat belt restraint system on HNR test outcomes.

Main Methods:

  • Conducted eight sled tests adhering to the SFI 38.1 protocol, incorporating additional setup constraints.
  • Performed four 0° frontal and four 30° right frontal (RF) oblique tests.
  • Utilized nylon SFI 16.1 seat belts for the first three tests and polyester SFI 16.6 for the fourth in each orientation; analyzed a secondary dataset (Lab B Data).

Main Results:

  • Two datasets from the SFI 38.1 protocol showed high variability in anthropomorphic test device (ATD) responses.
  • Tests with added setup constraints demonstrated significantly lower coefficients of variation (CVs) for ATD data (3.3% for 0° and 2.9% for 30° RF).
  • Lab B data and polyester seat belt tests exhibited higher CVs (22.9-24.5% and 5.3-6.2%, respectively), indicating less repeatability without constraints.

Conclusions:

  • The SFI 38.1 test protocol, with added common test setup constraints, yields a repeatable process for HNR performance evaluation within a single laboratory.
  • Polyester webbing seat belts appear to have a lesser impact on ATD neck responses compared to the variability introduced by test setup freedom within the current specification.
  • Implementing additional test setup constraints enhances the repeatability of ATD responses for HNR evaluations.