Abstract
The strength of tire fabrics, which largely determines tire carcass strength, is dependent not only upon the average strength of the tire cords of which the fabric is made but also upon their uniformity. The degree of uniformity can be meas ured by the coefficient of variation of strength and of elongation, but such data do not, by themselves, show directly the influence of tire cord uniformity on fabric strength. Various methods of estimating the effective strength of tire cord are discussed. A formula is presented which permits a simple calculation of the effec tive cord strength from the coefficient of variation of cord strength. The various methods show a satisfactory degree of correlation. The effective cord strength of several rayon and cotton tire cords has been calculated.
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