Ajax Attrition Shear Cell

Natural shear bands of the order of 5-10 particle diameters form between stagnant and flowing regions of powder beds.  This can lead to size reduction through unwanted attrition.  The attrition shear cell, manufactured by Ajax, consists of an annular gap with gripping rings at the base, within which a narrow powder bed is created.  The cell lid, also containing gripping rings, is placed on top of the powder bed and prevented from rotation by a stopper arm as the base is rotated.  Since the bed is gripped at the top and bottom, it is sheared.  The normal stress can be increased by adding weights to the lid or reduced by adding a counterbalance to a pulley attached to the lid.  Strain is controlled by varying the degree of rotation.  Attrition is determined by sieve analysis, which when completed for a range of stresses and strains leads to a relationship of attrition to prevailing shear conditions for the given powder.

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