The New Uniaxial Powder Tester from Freeman Technology
The Uniaxial Powder Tester (UPT) from Freeman Technology is a unique stand-alone uniaxial shear tester for simple, sensitive and cost-efficient powder characterisation. The instrument delivers repeatable and reliable measurements, providing a robust, cost-effective alternative to traditional powder testing techniques.
Uniaxial testing first involves the construction of a consolidated powder column. This is then removed from its confining sleeve before being fractured through the application of a vertical stress, directly measuring the uniaxial Unconfined Yield Strength (uUYS). This technique can therefore be used to assess and rank the flowability of powders.
Cohesive powders have relatively strong inter-particulate forces, which encourage the particles to stick together rather than moving easily relative to one another. By contrast, in free-flowing powders, the tensile forces between particles tend to be much weaker.
Uniaxial testing is a direct and reliable method for measuring uUYS (σc) and Flow Function of powders.
The UPT is available in either a manual or an advanced version. Both deliver the same data with high repeatability, whilst the advanced version also offers the advantage of increased levels of automation and reduced operator input.
The uniaxial Unconfined Yield Strength (uUYS) is a measurement of stress required to break or fail a previously consolidated, unconfined column of powder. The uUYS is similar to the Unconfined Yield Strength (UYS), a parameter derived from biaxial shear testers, but it should be noted that due to the different consolidation and failure protocols of the uniaxial and biaxial testers, it does not always follow that values for uUYS are identical to values of UYS.
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