Impact performance criteria employed in the evaluation of protective headgear often consider the temporal characteristics of the translational acceleration induced in the helmeted headform during impact. These implicit criteria may appear as limits on the time during which the test headform acceleration is allowed to exceed certain values, or may be inherent in the pass/fail criterion itself.The present study examines the significance of time as a parameter in the prediction of head injury likelihood or severity. It is shown that since the temporal characteristic of the acceleration waveform is simply a reflection of the mechanical characteristics of the headform/helmet assembly it bears only a trivial relation to the input forcing function and thus is generally uncorrelatable to head injury severity.It is concluded therefore that an upper limit on translational acceleration alone, though not without certain restrictions, constitute a sufficient criterion for evaluating helmet performance. The use of a time related parameter is shown to be unsupportable and can lead to unnecessarily complex criteria and inferior helmet performance. This paper was formerly presented at the AGARD AMP Specialists Meeting, Cologne, Germany, April 26–28, 1982.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    The Influence of Time Duration as a Failure Criterion in Helmet Evaluation


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    1982 SAE International Off-Highway and Powerplant Congress and Exposition ; 1982



    Publication date :

    1982-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    The influence of time duration as a failure criterion in helmet evaluation

    Newman,J.A. / Biokinet.and Assoc.,Ottawa,CA | Automotive engineering | 1982


    A fuzzy failure criterion in student evaluation

    Nambudiripad, K. M. B. / Menon, D. / Pavan Kumar, N. V. et al. | British Library Conference Proceedings | 1998


    HELMET AND HELMET SYSTEM

    CHEN HAORAN / DING EU-WEN | European Patent Office | 2020

    Free access

    HELMET AND HELMET SYSTEM

    CHEN HAORAN / DING EU-WEN | European Patent Office | 2017

    Free access

    HELMET SUPPORT ASSEMBLY, AND HELMET

    HAMZAOUI ELIÈS | European Patent Office | 2024

    Free access