![]() ![]() The best method to determine time dependent shear effects is to run constant shear rate or shear stress measurements over an appropriate range of experimental conditions of time of shear and rate of deformation. ![]() ![]() Actually this probably occurs more frequently than one would suspect. For example, if we have a fluid in a Brookfield viscometer and monitor the torque as the spindle rotates at a constant rpm, the torque will begin to decrease as the spindle continues to rotate, eventually reaching a steady state value torque or shear stress value.Īt certain shear rates, rheopexy can occur whereby the viscosity at a constant shear rate will increase with time of shear. Many fluids and soft solids are thixotropic, meaning that at a constant rate of deformation, the viscosity is a decreasing function of time of shear. ![]()
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