Figure 1.

Plots of the dimensionless pressure P* against λ_a based on equations (8.22) and (8.30) for the Gent model (8.32) with G=97.2, η=1.1 and λ_z=1.2: (a) for q*=0,1,5,10,20; (b) for e*=0,0.2,0.35,0.5,0.65. In each case, the uppermost curve corresponds to the purely elastic case and the value of P* decreases as the magnitude of the field measure, q* or e*, increases.