A Comparison of Some Elastic Properties of Tire Cords

Abstract

Additional information concerning the elastic properties of tire cords is needed since the present criteria involving breaking strength and elongation are considered insufficient to enable prediction of tire cord performance. The elastic behavior of Nylon, of rayon, and of unstretched and stretched cotton tire cords are compared with respect to their rates of elongation during measurement of the stress‐strain curves and their elongation under static loads at various temperatures between 25° and 200°C. Elongations under the influence of cyclic loads are shown for cotton and rayon cords, and an apparatus for determining mechanical hysteresis of tire cords during cyclic loading is described. The temperature and moisture content of the cord are shown to have considerable effect upon its elastic properties.