The chin bar of a motorcycle helmet protects the rider from facial and head injuries. To evaluate the protective performance of chin bars against head injuries from facial impacts, an explicit finite element method was used to simulate the Snell Memorial Foundation test and a proposed drop test. The maximum acceleration and Head Injury Criterion (HIC) were employed to assess the impact-absorbing capability of the chin bar. The results showed that the proposed approach should be more practical than the Snell test, and provided more information for improving the chin bar design to protect against head injuries. The shell stiffness was important in determining the protective ability of the chin bar, but a chin bar with only an outer shell and comfort foam offered inadequate protection. An energy-absorbing liner was essential to increase the protective performance of the chin bar and the liner density should be denser than that used in the cranial portion of the helmet. For the chin bar with energy-absorbing liner, a shell design that is less stiff would provide better protection. [S0148-0731(00)01206-1]
Head Injury in Facial Impact—A Finite Element Analysis of Helmet Chin Bar Performance
Contributed by the Bioengineering Division for publication in the JOURNAL OF BIOMECHANICAL ENGINEERING. Manuscript received by the Bioengineering Division April 28, 1999; revised manuscript received July 10, 2000. Associate Technical Editor: M. L. Hull.
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Chang , C., Chang , L., Chang, G., Huang, S., and Wang, C. (July 10, 2000). "Head Injury in Facial Impact—A Finite Element Analysis of Helmet Chin Bar Performance ." ASME. J Biomech Eng. December 2000; 122(6): 640–646. https://doi.org/10.1115/1.1318905
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