In vehicle–cyclist collisions, the head of cyclists impacts frequently against the windshield and the A-pillar of the vehicle. Accident analyses show that the head injury risk is high in impacts with stiff A-pillars. In this research, the head protection with cyclist helmets in impacts against the A-pillar was investigated from experiments and finite element (FE) analyses. The headform impact tests were conducted using the pedestrian headform with and without a cyclist helmet. In the A-pillar impact at 35 km/h, the HIC reduced substantially from without helmet (4815) to with helmet (3000) though it was far above the injury acceptance level (1000). The head protection by helmets in impacts against A-pillars might be limited because of high impact velocities of the head and A-pillar stiffness. The FE simulations of the headform impacts indicated that the helmet liner deformed locally and bottomed-out in the A-pillar impacts, whereas the A-pillar deformation was small. In the FE analysis of a human head model with a capping helmet, the skull fracture did not occur but the brain strain was large. From a simple model of the head acceleration in the A-pillar impact, it was shown that the helmet liner has little effect on the HIC, whereas a deforming A-pillar with a force level of 5–7 kN could reduce the HIC of the head with helmets less than 1500.


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    Title :

    Head protection with cyclist helmet in impact against vehicle A-pillar


    Contributors:
    Mizuno, Koji (author) / Ito, Daisuke (author) / Oida, Keiji (author) / Kobayashi, Goichi (author) / Han, Yong (author)

    Published in:

    Publication date :

    2017-05-04


    Size :

    10 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Cyclist Head Protection with Helmet in Impact against A-pillar

    Ito, Daisuke / Oida, Keiji / Kobayashi, Goich et al. | British Library Online Contents | 2015


    CYCLIST PROTECTION DEVICE OF VEHICLE

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    Free access

    CYCLIST PROTECTION DEVICE OF VEHICLE

    NAGASAWA ISAMU / KONDO TAKAO | European Patent Office | 2017

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    CYCLIST PROTECTION DEVICE OF VEHICLE

    NAGASAWA ISAMU / KONDO TAKAO | European Patent Office | 2017

    Free access

    CYCLIST PROTECTION DEVICE OF VEHICLE

    NAGASAWA ISAMU / KONDO TAKAO | European Patent Office | 2017

    Free access