The Society of Rheology Nomenclature（社会流变学的术语）.pdf

TABLE I. The Society of Rheology nomenclature for steady simple shear. Quantity Symbol S.I. units CGS units Direction of flow x or x m cm 1 Direction of velocity gradient x or y m cm 2 Neutral direction x or z m cm 3 Shear stress σ Pa dyn cm–2 Shear strain γ – – –1 –1 Shear rate γ s s Viscosity η Pa s P (poise) First normal stress function N 1 Pa dyn cm–2 Second normal stress function N2 Pa dyn cm–2 2 2 –2 First normal stress coefficient Ψ1 Pa s dyn s cm 2 2 –2 Second normal stress coefficient Ψ2 Pa s dyn s cm Limiting viscosity at zero shear rate η0 Pa s P Limiting viscosity at infinite shear rate η∞ Pa s P Viscosity of solvent or of continuous ηs Pa