Characterization of Cord Fatigue in Tires

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Abstract
Fatigue in tire cords causes a linear loss of cord tensile strength with mileage and an increased fiber torsional stiffness. The loss in cord strength is centered mainly in the flex zone. The loss of cord strength stems from broken filaments and from a small loss of fiber strength throughout the tire. The lowered fiber strength is attributed to a lowered D.P., and does not appear to be connected with the broken filaments observed in the flex zone. The cause of the broken filaments has not been resolved. However, studies show that it is not due to abrasion or heat degradation. It was found possible to duplicate tire fatigue characteristics in the laboratory by causing cords to go through an extension-compression cycle approximately equivalent to the one in tires. Under these conditions, the Goodrich disk-type tester showed the same relative rate of strength loss for rayon and cotton cords as was found in a passenger tire fleet test.

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