STP793: Influence of Tread Wear Irregularity on Wet Friction Performance of Tires

    Williams, AR
    Manager, Tyre Evaluation, Tyre Technical Division and group leader, Engineering and Property Testing, Indoor Tyre Testing Department, Dunlop Limited, Fort Dunlop, Birmingham,

    Evans, MS
    Manager, Tyre Evaluation, Tyre Technical Division and group leader, Engineering and Property Testing, Indoor Tyre Testing Department, Dunlop Limited, Fort Dunlop, Birmingham,

    Pages: 24    Published: Jan 1983


    Abstract

    The reduction in wet skidding resistance with reduced tire tread pattern depth on road surfaces possessing low macrotexture is well understood. With the dominance of radial tire construction, with its inherently higher abrasion resistance, automobile tires are often observed to be removed from the vehicle in an irregularly worn condition rather than the regularly worn condition that has been the subject of previous work. This paper describes tire measurements using indoor and outdoor test facilities for a range of tires that includes the most common irregularly worn conditions: those of two-shoulder and one-shoulder wear, center wear, and the increasingly less observed uniform wear. The correlation between test methods is discussed and observed differences in tire friction characteristics with wear type explained. The stability of the vehicle under low friction conditions is an additional factor in the accident mode situation; the influence on vehicle stability due to irregular tire wear and that provoked by changing the position of part-worn tires on the vehicle is also discussed.

    Keywords:

    tires, wet skidding resistance, tread wear, vehicle stability, tire testing methodology, road surfaces


    Paper ID: STP28517S

    Committee/Subcommittee: F09.20

    DOI: 10.1520/STP28517S


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