18. The flow of a 12% suspension of bentonite clay in the studied range of loads is described by the Bingham equation for a viscoplastic body. Plot the suspension flow curve, calculate the ultimate shear stress and its plastic viscosity according to the following experimental data:
Р, N/m2 20 25 30 35 40
Strain rate y, s–1 250 480 710 940 1100

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