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Freeman Technology has added a uniaxial powder tester to the FT4 powder rheometer, extending the system’s ability to measure properties that directly correlate with a powder’s in-process behaviour.

Uniaxial testing is said to complement the FT4’s existing test methodologies for shear, bulk and dynamic powder measurement.

Freeman said it is a simple and direct method of measuring unconfined yield strength, a parameter related to cohesivity.

Previously the use of the technique has been inhibited by the difficulties inherent in repeatably producing a uniformly packed and consolidated powder column for testing.

As a result, unconfirmed yield strength data are routinely derived from shear testing, a less direct but practical alternative.

Freeman Technology has developed an accessory that, in combination with a well-defined consolidation methodology, produces a homogeneous, uniform powder column for testing.

Measuring the normal stress required to fracture the column directly identifies the unconfined yield strength.

Comparative tests show that the new solution produces data closely comparable to those derived from shear test data, but offers improved repeatability.

Uniaxial testing is not suitable for powders with very low cohesive strength, but is a quick and intuitive method for measuring unconfined yield strength of more cohesive materials.

It is said to complement rotational shear testing, which in contrast requires less sample, can be used for less cohesive materials and is essential for measuring wall friction data in support of material of construction choice.

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