1. Based on the data below, plot the relative strain γ versus time τ under the action of a constant shear stress P on it, as well as after its removal (P=0). Determine which composite rheological model corresponds to these dependencies, and calculate the value of the modulus of elasticity E and viscosity η of the body.

Lead
P=1.3*107 N/m2
τ, c γ *103
0.01 1.85
10 2.12
20 2.40
30 2.68
50 3.23
70 3.78
P=0
70 1.93
100 1.93
130 1.93

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