High shear rate flowing vertically accumulative oscillatory rheology test method and device

A test method, technology of vertical stacking, applied in the direction of measuring devices, flow characteristics, instruments, etc.

Active Publication Date: 2014-05-28
HUNAN UNIV OF TECH
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  • Abstract
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Problems solved by technology

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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  • High shear rate flowing vertically accumulative oscillatory rheology test method and device

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Embodiment Construction

[0020] The present invention will be further described below with reference to the drawings and embodiments. However, the protection scope 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 concept of the present invention, several simple deductions or equivalent substitutions can be made, and these equivalent substitutions will still be regarded as falling within the protection scope of the present invention .

[0021] The core structure of the invented testing device is composed of a plunger 1, a barrel 2 and a core rotor 6, and the barrel contains a material 4. 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 to perform closed-loop control according to the temperature value measured by the temperature sensor 7 to ensure the constant temperature of the material flo...

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Abstract

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 method and a device for testing vertical superimposed oscillating rheology of high shear rate flow. Background technique [0002] At present, the current commercial rheometers cannot study the dynamic rheological behavior of materials under high shear rates. The research of high shear rate rheological behavior can only rely on the capillary rheometer, not the dynamic rheological behavior. The instrument used for dynamic rheology test is mainly a rotary rheometer, which is limited to low shear rate, which is quite different from the actual molding process, and cannot meet the needs of actual production. [0003] The Chinese patent with application number CN200510033364 introduces a polymer capillary sinusoidal pulsation extrusion rheometer, which can measure the rheological behavior of polymer in the capillary under the action of sinusoidal pulsation. The Chinese patent with application number CN200820210912 introduces a method and...

Claims

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Application Information

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IPC IPC(8): G01N11/14
Inventor 李祥刚刘跃军
Owner HUNAN UNIV OF TECH
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