Expert in Helmets

Related Papers and Presentations

Effectiveness of Current and Alternative Helmet Materials in the Prevention of Head and Neck Injuries as Measured by Biomechnical Parameters, 19th Annual Workship on Human Subjects for Biomechanical Research

Head and Neck impacts in motorcycle accidents remain a significant problem for helmeted riders and result in over 400 severe injuries and fatalities annually. Helmeted head impacts in other accidents contribute countless more.

Our impression is that little has been done in the past fifteen years to ensure that helmets provide the level of head/neck protection needed to preclude crtical injury in forseeable, and relatively minor, impacts.

Therefore, the purpose of this paper is to:

1) Examine the effectiveness of current and alternative materials in preventing the occurence of critical injuries to the neck during a head impact, and

2) Identify modifications in helmet design and current testing standards which would significantly improve the level of protection provided against crtical injury in a helmeted head impact.

Finite Element Analysis of Bicycle Helmet, 10th International Conference on Biomedical Engineering

Bicycle helmets are widely used as safety devices, especially among children. The construction of these safety devices was, until recently, unregulated and the certification of these devices depended upon several different standards such as ASTM, ANSI and SNELL. These standards describe a series of qualifications a helmet must satisfy in order to be certified. Improvements in helmet design can be determined early in the development stage through the use of finite element studies. This will result in safer helmets that are tested over the entire helmet and range of feasible orientations. The present study was designed to examine the level of protection at various impact locations and the effects of altering geometry and material. The finite element technique was used because of its capability to simulate irregular geometry and conduct parametric study.

Bicycle Helmet Roll-Off Prevention Design and Testing


Current requirements for bicycle helmet retention testing do not specify representative chin strap tension requirements. The nominal chin strap adjustment characteristics when the bicycle helmet is in use would affect the roll-off performance under impact loading conditions to the rear of the helmet. A standardized method of measuring chin strap looseness was established and used. Quasi-static testing of alternative chin strap designs was conducted to establish their elongation properties. A dynamic impact utilizing a Hybrid III head form and a pendulum was created and used to evaluate the effects of alternative retention system design under controlled impact conditions. An alternative design was compared with a baseline system under dynamic impact loading. During dynamic tests the bicycle helmet retention system allowed the helmet to rotate forward exposing the Hybrid III head to ground contact. Conversely under the same chin strap slack the alternative helmet was retained and did not allow head contact with the ground. Thus, a standardized test method to measure bicycle helmet retention system slack and a dynamic helmet retention test procedure is described and demonstrated.


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