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    Wear Transition Surfaces for Long-Term Wear Effects

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    Tribologists tend to present friction and wear data as tabulations of values for specific ranges of test conditions. The conditions generally involve short test durations and express system loads in terms of applied forces. The designer, on the other hand, is concerned with stress levels and component durability, in particular time to failure. Because machine components are frequently exposed to cyclic stress conditions, fatigue effects cannot be ignored, especially in non-metallic materials containing residual flaw populations. Wear maps and transition diagrams are emerging as a convenient means of summarizing and presenting wear data in a form useful to designers. An extension of one of the diagrams to incorporate the effects of time on wear response is proposed and discussed.


    transition diagrams, wear maps, fatigue, wear modes, silicon nitride, whisker composite

    Author Information:

    Yust, CS
    Senior Research Staff Member, Oak Ridge National Laboratory, Oak Ridge, TN

    Committee/Subcommittee: G02.30

    DOI: 10.1520/STP17663S