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The principle of simple-shear rheometry for the measurements of viscoelastic shear properties. Shear stress is given by the ratio of the shear force F to the sample area A, whereas shear strain is defined as the ratio of the displacement x to the gap size d. According to the theory of linear viscoelasticity, the elastic shear modulus (G’) and dynamic viscosity (η’) of the sample can then be quantified as a function of frequency, up to 250 Hz.
