(211b) Impact of Different Shear Rates of Ring Shear Tester (RST) On Unconfined Yield Strength Conference: AIChE Annual MeetingYear: 2010Proceeding: 2010 AIChE Annual MeetingGroup: Particle Technology ForumSession: Characterization and Measurement in Powder Processing Time: Tuesday, November 9, 2010 - 8:49am-9:08am Authors: Han, T., The Dow Chemical Company Dhodapkar, S., The Dow Chemical Company Jacob, K., The Dow Chemical Company Gong, T., Solids Processing, Engineering Sciences Abstract: Shear testers are used to measure the flow properties of particulate solids. It has been reported in the literature that the different shear rates have no significant impact on shear test results. Therefore, it has been widely accepted that the shear rates during shear tests should be kept between 1 and 2 mm/min. This work applied the different shear rates (0.375, 1.5 and 6 mm/min) with Ring Shear Tester (RST) on 4 different particulate solids (one is soft and sticky, one is soft but non-sticky, one is non-soft but sticky, and one is non-soft and non-sticky). The results show that the different shear rates had no significant impact on the instantaneous shear test results. However, the different shear rates did have a significant impact on 2-hour time consolidation shear test results.