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    A Mathematical Technique for Comparing Shear Stability in Bench Tests and Service

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    Viscosity decrease as a function of the duration of mechanical shearing is described by a mathematical model. Applicability of the model to several different types of service is demonstrated. For automobile engine oil service that shows a viscosity decrease initially, followed by a gradual viscosity increase, the model offers a means of separating the viscosity decrease term from the total viscosity change. The model provides a rational method of comparing shearing in bench tests with shearing in service. It also offers a means for detailed comparisons of the shear stability of different lubricants in a given service.

    Author Information:

    Rein, SW
    Texaco Inc.,

    Randall, NP
    Texaco Inc.,

    Marshall, HT
    Texaco Inc.,

    Lewis, BJ
    Texaco Inc.,

    Committee/Subcommittee: D02.B0

    DOI: 10.1520/STP32382S