ASTM WK75434

    Revision of D7891 - 15 Standard Test Method for Shear Testing of Powders Using the Freeman Technology FT4 Powder Rheometer Shear Cell

    (What is a Work Item?)

    Active Standard: D7891 - 15

    Developed by Subcommittee: D18.24 | Committee D18 | Contact Staff Manager



    WK75434


    Keywords

    effective angle of friction; effective yield locus; flowability; flow function; Freeman Technology, FT4 Powder Rheometer; internal friction angle; powder; rotational shear cell; unconfined yield strength; wall friction; wall friction angle;;

    Rationale

    Revision reflects persuasive amendments submitted as Negatives and Comments from sub-committee ballot D18 20-02. 1. Scope 1.1 This method covers the apparatus and procedures for measuring the incipient failure properties of a powder as a function of the normal stress for a given level of consolidation. The method also allows the further determination of the unconfined yield strength, internal friction angles, cohesion, flow function, major principal stress and wall friction angle (with the appropriate wall coupon fitted to the correct accessory). 1.2 The parameters generated during this test are most commonly used to assist with the design of storage hoppers and bins using industry standard calculations and procedures. They can also provide relative classification or comparison of the flow behavior of different powders or different batches of the same powder if similar stress and shear regimes are encountered within the processing equipment.

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    Work Item Status

    Date Initiated:
    01-11-2021

    Technical Contact:
    Jamie Clayton

    Item:
    015

    Ballot:
    D18 (21-05)

    Status:
    Negative Votes Need Resolution