A high shear rate flow vertical superposition oscillatory rheological test method and device
A technology of vertical stacking, testing devices, applied in the direction of measuring devices, flow characteristics, instruments, etc.
Active Publication Date: 2016-11-09
HUNAN UNIV OF TECH
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The above-mentioned invention realizes the test of dynamic rheological behavior under high shear rate. However, the above-mentioned invention is a rheological test method of high-shear rate flow parallel superimposed oscillation. During the test, the material density changes with time, and the mainstream field There is a coupling effect between the superimposed flow field
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[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. However, the scope of protection of the present invention should not be regarded as limited to the following specific embodiments. For those of ordinary skill in the art, without departing from the basic premise of the present invention, some simple deduction or equivalent replacements can be made, and these equivalent replacements will still be considered within the protection scope of the present invention .
[0021] The core structure of the inventive testing device is composed of a plunger 1, a material cylinder 2 and a core rotor 6, and the material 4 is housed in the material cylinder. The space enclosed by the barrel 2 and the core rotor 6 is the annular slot die 3 . A heating device is installed on the barrel 2, and closed-loop control is performed according to the temperature value measured by the temperature sensor 7 to ensure that the materia...
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The invention relates to a high shear rate flowing vertically accumulative oscillatory rheology test method and a high shear strength flowing vertical accumulative oscillatory rheology device, The method is characterized in that material in a material barrel passes through a circular seam type die under the extruding of a plunger to form a main flow field with high shear strength, and according to the speed of the plunger, the pressure gradient of a complete development flowing area, the shape of the die, the interface size of the plunger and the like, the values of the shear stress and the shear rate of the main flow field are obtained via calculation; material in a gap of the die is driven via the movement of the oscillatory motion of a die core rotor to generate a vertically accumulative oscillatory flow field, the value of the shear stress and the shear strain and the shear rate of the accumulative oscillatory flow field are obtained via calculation according to the torsional moment and oscillation frequency of the die core rotor, the size of the material barrel, the size of the die core rotor and the like, and further the functions of various material are obtained; a heater is mounted on the material barrel and used for ensuring that a material flow is at a constant temperature in an experiment process. The method and device can be used for characterizing the viscoelasticity and the micro structure of the material at the high shear rate, inspect the constitutive equation of the material at high shear rate, and guide forming processing.
Description
technical field [0001] The invention relates to a high shear rate flow vertically superimposed oscillation rheological test method and device. Background technique [0002] Currently, current commercial rheometers are unable to study the dynamic rheological behavior of materials at high shear rates. The study of rheological behavior at high shear rate can only be done with the help of capillary rheometer, and dynamic rheological behavior cannot be studied. The instruments used in dynamic rheological testing are mainly rotational rheometers, which are limited to low shear rates, which are quite different from the actual molding process and cannot meet the needs of actual production. [0003] The Chinese patent application number CN200510033364 introduces a polymer capillary sinusoidal pulsation extrusion rheometer, which can measure the rheological behavior of a polymer in a capillary under the action of sinusoidal pulsation. The Chinese patent with the application number C...
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IPC IPC(8): G01N11/14
Inventor 李祥刚刘跃军
Owner HUNAN UNIV OF TECH