Work Item
ASTM WK75434
Revision of D7891-15 Standard Test Method for Shear Testing of Powders Using the Freeman Technology FT4 Powder Rheometer Shear Cell
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.
Work Item Status
Date Initiated: 01-11-2021
Technical Contact: Ben Freireich
Item: 026
Ballot: D18 (21-02)
Status: Will Reballot Item
Item: 015
Ballot: D18 (21-05)
Status: Will Reballot Item
Item: 014
Ballot: D18 (22-01)
Status: Negative Votes Need Resolution