Question

What is the characteristic variation shown by the thixotropic fluids in their shear stress vs. rate of shear strain graph?

(a) shear stress increases with increase in rate of shear strain

(b) shear stress decreases with increase in rate of shear strain

(c) shear stress shows variation only after a definite shear stress is reached

(d) shear stress has decreasing constant and then variation relationship with rate of shear strain

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I need to ask this question from Viscosity topic in portion Properties of Fluids of Fluid Mechanics

Answer 1

Correct option is (c) shear stress shows variation only after a definite shear stress is reached

Easy explanation: Thixotropic fluid show a Non-Newtonian variation for shear stress vs. rate of shear strain graph after a characteristic limiting value of shear stress is reached.