Correction method for rheological test data of coaxial cylinder rheometer

Abstract

The invention discloses a correction method for rheological test data of a coaxial cylinder rheometer. The correction method specifically comprises the following steps: putting a sample to be tested into a coaxial cylinder rheometer test system; carrying out a test under a set mode, and acquiring data; introducing an angle acceleration correction item for shear stress to calculate real shear stress at the boundary of a corrected coaxial cylinder measurement clamp and apparent viscosity of a corrected material. The correction method has the beneficial effects that by introducing a torque correction item and considering torque consumption of a system inertia (a motor rotor inertia and a measurement clamp inertia), deviations of the rheological data acquired by the conventional rheometer can be corrected, and the rheological property of a medium to be tested can be recognized more accurately.

Description

technical field [0001] The invention relates to a coaxial cylinder rheometer, in particular to a correction method for the rheological test data of the coaxial cylinder rheometer. Background technique [0002] Rotational rheometer is an important tool for rheological measurement, and its accurate measurement will provide a series of reliable basic data for the research on the rheological properties of materials in the industrial and scientific research fields. The rotational rheological measurement is to collect the motion parameters at the boundary of the measurement gap through the rotational rheometer acquisition system, and convert the corresponding rheological parameters (stress, shear rate, strain, etc.) according to the mechanical response relationship between the motion parameters and the rheological parameters. etc.) indirect measurement methods. [0003] At present, most rotational rheometers use the response relationship between the motion parameters and the rheo...

AI Technical Summary

Problems solved by technology

However, for the unsteady state process caused by the change of shear rate (stress) during the transient process of the rotational rheometer from static start to the set shear rate or shear stress, the response relationship of the steady state process is still used to Unable to obtain accurate rheological parameters

At the same time, subject to the existing mechanical level, the rheometer motor inertia, fixture inertia and instrument response will aggravate the unsteady flow during start-up and measurement

Especially in the rheological test process of non-Newtonian fluids (such as viscoelastic and thixotropic fluids) that are very sensitive to shear history, inaccurate rheological data during the initial start-up and measurement process will greatly affect the researcher's understanding of the rheological properties of the material. judge

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