An approximate analytical solution for stress distribution in the rectangular lens of a glass headlamp due to static and impact loading is presented. Both low mass/high velocity and high mass/low velocity impact data and the resulting failure modes are discussed. Generally, glass headlamp lenses break either due to Hertz stress (front surface under high localized tension), or due to flexural stress (back surface under tension due to bending), or the combination of two. Failure due to flexural stress is illustrated by a star-crack, while that due to Hertz stress is illustrated by a Hertzian cone or “bullet hole” in the lens.The failure mode during low mass/high velocity impact is predominantly Hertzian while that during high mass/low velocity impact is flexural for lenses 0.120″ to 0.150′ thick. No significant differences are observed in the impact resistance of standard and light-weight lenses in this thickness range.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Failure Modes During Static and Impact Loading of Light-Weight Rectangular Glass Headlamps


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    5th International Exposition on Vehicular Structural Mechanics ; 1984



    Publication date :

    1984-04-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Failure Modes During Static and Impact Loading of Light-Weight Rectangular Glass Headlamps

    Gulati,S.T. / Cole,H.R. / Corning Glass Works,Research and Development Lab.,US | Automotive engineering | 1984



    Interchangeability of Automotive Headlamps - Rectangular?

    Hemion, Roger H. | SAE Technical Papers | 1974


    Logo Light Headlamps

    KIM SEON WOO | European Patent Office | 2025

    Free access

    Motorcycle Headlamps

    SAE Technical Papers | 2010