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Leading Trade Fair for Powder & Bulk Solids Processing and Analytics

30.08. - 01.09.2022 // Nuremberg, Germany

New Date: POWTECH 2022 from 30 August - 01 September 2022

+++ The entries in the exhibitor & product database correspond to the registration status for POWTECH 2019. +++

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Exhibitors & Products POWTECH 2019
Zoom Image LOGO_The Automated Shear Cell modules for the FT4 Powder Rheometer

The Automated Shear Cell modules for the FT4 Powder Rheometer

LOGO_The Automated Shear Cell modules for the FT4 Powder Rheometer

The Automated Shear Cell modules for the FT4 Powder Rheometer

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The Automated Shear Cell modules for the FT4 Powder Rheometer allow assessment of powders in terms of shear strength. Using a shear cell on the high-specification FT4 platform enables the automatic generation of accurate and reproducible shear information. This is in addition to bulk properties data and the comprehensive flowability data provided by a standard FT4 measurement (in accordance with ASTM Standard D7891).

A range of shear cell options is available to suit different sample sizes and applications:

  • 85ml powder volume using 48 mm diameter shear head
  • 10ml powder volume using 24 mm diameter shear head
  • 1ml powder volume using 24 mm diameter shear head

Fully automated testing

Each shear cell is delivered with a library of testing programs in which the following stages are fully automated:

  • The standard conditioning cycle that prepares the sample for testing
  • A 'pre-shear' stage during which the powder bed is sheared to maximize the major principal stress
  • A single series of tests at a particular pre-consolidation stress, which may be sufficient for powder characterization. For example, a powder may be pre-consolidated to 10 kPa and then sheared at 9, 6 and 3 kPa, with pre-consolidation to 10 kPa between each test
  • More comprehensive, multi-stage testing to produce a range of yield loci corresponding to different pre-consolidation stress levels. Usually a given sample will be suitable for repeated shear testing to obtain the required set of yield loci. In this case the entire evaluation is automated.

Parameters derived from shear testing:

  • Yield loci – shear strength vs normal applied stress
  • Cohesion – shear strength at yield when normal stress is zero
  • Internal angle of friction
  • Unconfined yield strength or compression strength
  • Major principal stress
  • Flow function (the plot of unconfined yield stress versus major principal stress) Particular benefits of the Freeman shear cells:
  • Relatively low cost – being an FT4 accessory
  • Pre-conditioning of sample to obtain a homogenous powder bed
  • Fully automated shear testing and data analysis
  • Ability to evaluate non-consolidated powders
  • 1 ml minimum sample size

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