Creep Ringing in Rheometry or How to Deal with Oft-discarded Data in Step Stress Tests!
نویسندگان
چکیده
Introduction Inertial effects are ubiquitous and unavoidable in stress-controlled rheometry. Many readers of this Bulletin will have seen the kind of phenomena shown in the experimental data of Figure 1. If the fluid is sufficiently viscoelastic, inertio-elastic 'ringing' events (i.e. damped oscillations) are observed in the angular displacement measured at the start of a creep test, as a result of the coupling of instrument inertia and sample elasticity. Even if the fluid is a simple viscous Newtonian fluid one may have noticed that the initial strain response of any real creep test is always quadratic in time, rather than the simple linear
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