STP694

    Bias Passenger Tires: Effect of Construction on the Cord Deformation and Temperature Rise During Rolling

    Published: Jan 1979


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    Abstract

    The effect of carcass construction on the cord deformation and temperature rise in tire during rolling is poorly understood. In order to establish the effects of changes in ply construction, number of plies, crown angle, and cord construction, we analyzed the cord deformation and temperature rise in a set of tires where these carcass construction characteristics were systematically varied. Other tire design variables were maintained constant including the polyethylene terephthalate yarn from which the cords were constructed. Four tires of each type were subjected to (a) an increasing speed-constant load test, and (b) an increasing load-constant speed test which were carried out on a laboratory testing wheel.

    By means of an analytical procedure described in detail, we determined the temperature profiles in the tire cross section, the maximum temperature in tire, and the deformation amplitudes of the tire cords. The results of increasing speed and increasing load tests show that the tire which runs coolest at high speeds does not necessarily do so under high loads and vice versa. Cord deformation analysis showed that at high load the cords are subjected to significant compression which is detrimental because the fatigue resistance of polymeric cords in compression is very low. The cords removed from failed section of the tire (sidewall) show distinct kink bands which confirm the results of the deformation analysis.

    Keywords:

    tire construction, cord deformation, bias tire, temperature rise, heat generation


    Author Information:

    Prevorsek, DC
    Senior scientist, customer technical engineer, senior research engineer, and senior research chemist, Chemical Research Center, Allied Chemical Corp., Morristown, N.J.

    Beringer, CW
    Senior scientist, customer technical engineer, senior research engineer, and senior research chemist, Chemical Research Center, Allied Chemical Corp., Morristown, N.J.

    Kwon, YD
    Senior scientist, customer technical engineer, senior research engineer, and senior research chemist, Chemical Research Center, Allied Chemical Corp., Morristown, N.J.

    Sharma, RK
    Senior scientist, customer technical engineer, senior research engineer, and senior research chemist, Chemical Research Center, Allied Chemical Corp., Morristown, N.J.


    Paper ID: STP36957S

    Committee/Subcommittee: D13.19

    DOI: 10.1520/STP36957S


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