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Figure 1 F shear stress, t = force/area shear strain, g = angular deflection g A Small angle approximations: sin g ~ g tan g ~ g thus, strain = y/x shear modulus: viscosity: Figure 2 Figure 3 Figure 4 r d slope, m angular velocity = wr thickness, d = mr shear strain = wr/mr = w/m Rube Goldberg (1883-1970) Figure 5 Low strain, low strain rate Hookian behavior Figure 6 High strain, high strain rate Hysteresis Figure 7 Gt/Go = 1 purely elastic material lack of linearity implies multiple time constants Figure 7 At low strain/strain rate slime dominated by elastic Modulus, G’ Figure 9 Key figure: slime undergoes solid to liquid transition at critical stress healing healing Figures 10, 11 Yield stress and flow stress increase with strain rate… slope = viscosity …but ratio remains constant. Figure 12 after long healing after short healing Figure 14 time course of healing process liquifying here solidiifying here