CN103822852B - A kind of high-rate of shear flowing longitudinal stack vibration rheology method of testing and device - Google Patents
A kind of high-rate of shear flowing longitudinal stack vibration rheology method of testing and device Download PDFInfo
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- CN103822852B CN103822852B CN201410076542.7A CN201410076542A CN103822852B CN 103822852 B CN103822852 B CN 103822852B CN 201410076542 A CN201410076542 A CN 201410076542A CN 103822852 B CN103822852 B CN 103822852B
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- 238000000518 rheometry Methods 0.000 title claims abstract description 13
- 238000010998 test method Methods 0.000 title abstract description 8
- 230000010355 oscillation Effects 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000009423 ventilation Methods 0.000 claims abstract description 13
- 230000001052 transient effect Effects 0.000 claims abstract description 6
- 238000012360 testing method Methods 0.000 claims description 41
- 238000012937 correction Methods 0.000 claims description 18
- 230000000694 effects Effects 0.000 claims description 13
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000003534 oscillatory effect Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
- 238000009434 installation Methods 0.000 claims 1
- 238000010008 shearing Methods 0.000 claims 1
- 238000012545 processing Methods 0.000 abstract description 2
- 238000007689 inspection Methods 0.000 abstract 1
- 230000008569 process Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 239000002131 composite material Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Abstract
The present invention relates to a kind of high-rate of shear flowing longitudinal stack vibration rheology method of testing and device.It is characterized in that the material in barrel under the extruding of plunger, by ring-crack ventilation mouth die, form the main flow field of high-rate of shear, according to velocity of plunger, the barometric gradient of fully developed flow region, Oral incision, plunger interface dimensions etc., be calculated the value of main flow field shear stress and shear rate；The material between mouth die gap is driven to produce longitudinal stack oscillating flow field by the oscillating movement of core rod rotor, moment of torsion according to core rod rotor and frequency of oscillation, and the size etc. of barrel and core rod rotor, it is calculated the value of shear stress, shear strain and the shear rate in superimposed oscillation flow field, obtain various Transient networks further；Heater is installed, it is ensured that stream constant temperature in experimentation on barrel.The method and device can be used for characterizing viscoplasticity and the microstructure of material under high-rate of shear, and under inspection high-rate of shear, the constitutive equation of material, instructs processing and forming.
Description
Technical field
The present invention relates to a kind of high-rate of shear flowing longitudinal stack vibration rheology method of testing and device.
Background technology
At present, current business-like flow graph cannot study the dynamic rheological behavior of material under high-rate of shear.The research of high-rate of shear rheological behaviour can only be by capillary rheometer, it is impossible to research trends rheological behaviour.Rheological behavior instrument is mainly rotational rheometer, is limited to low shear rate, differs bigger with actual molding process, it is impossible to meet the needs of actual production.
A kind of polymer capillary sinuous pulsation squeezing rheometer of the Introduction To Cn Patent of Application No. CN200510033364, it can measure rheological behaviour in capillary for the polymer under sinuous pulsation effect.The Introduction To Cn Patent of Application No. CN200820210912 a kind of rheological behavior of polymer composite material method of testing and device thereof, it can truly measure extrusion molding process under physical field invigoration effect for the polymer composites, Process of Capillary Extrusion, the rheological behaviour of process of injection molding, moreover it is possible to the rheological behaviour of measurement polymer composites when processing conditions and parameter press specific program change.The Introduction To Cn Patent of Application No. CN 201110391282 a kind of straight-line oscillation type annulus extrusion rheometer, annulus between center bar and barrel constitutes test chamber, flowable testing sample chamber outflow after tested under the squeezing action of squeezing rod stopper rod in barrel, center bar makees straight-line oscillation along center line.Foregoing invention achieves the test of dynamic rheological behavior under high-rate of shear, but, foregoing invention is the rheometer test method of the parallel superimposed oscillation of high-rate of shear flowing, in test process, material density changes in time, and main flow field exists coupling with superposing between flow field.
In longitudinal stack vibration rheometer test, main flow field can be ignored with the coupling superposing between flow field.Current longitudinal stack rheometer test is with flow field based on the flow field of the rotary motion generation of rotational rheometer rotor, in the direction being perpendicular to main flow field, superimposed oscillation.Due to reasons such as centrifugal force, pole-climbing effects, the shear rate that the flow graph main flow field energy of this structure reaches is generally less than 10s-1, much smaller than the shear rate in a lot of molding process.
Content of the invention
It is an object of the invention to provide a kind of high-rate of shear flowing longitudinal stack vibration rheology method of testing and device.Can control the value of the shear rate (or shear strain) in main flow field and superimposed oscillation flow field, test obtains the value of the shear stress in main flow field and superimposed oscillation flow field, it is possible to be calculated various Transient networks further.The maximum shear speed that flow graph main flow field energy reaches is 105s-1, range of shear rate can be measured and cover overwhelming majority molding process.The various Transient networks obtaining, may be used for characterizing viscoplasticity and the microstructure of material under high-rate of shear, it is also possible to for checking the constitutive equation of material under high-rate of shear, instruct the improvement of contour machining equipment and technique.This method of testing and device achieve the unstable state rheometer test under high-rate of shear, overcome traditional rotational rheometer and can only carry out rheometer test at low shear rates, and capillary rheometer can be only used for the defect of stable state rheometer test.
The device that the present invention provides, specifically includes that plunger；Drive the electric motor and controller system of plunger motion；Barrel and temperature control system thereof；Core rod rotor；Drive the electric motor and controller system of core rod rotor motion；Circumferential weld fully developed flow region axial pressure gradient tests system；Core rod rotor circumference Torque Measuring System；Software systems.
Heater is installed on barrel and realizes closed-loop control, it is ensured that stream constant temperature in experimentation.After barrel reaches the temperature setting, test material is added barrel, and waits temperature of charge to be stable at design temperature.The control system control motor driving the motor of plunger presses setting speed motion, the stream in motor pushing sliding cylinder extrusion barrel, by ring-crack ventilation mouth die, forms the main flow field of high-rate of shear.The fully developed flow region axial pressure gradient of circumferential weld fully developed flow region axial pressure gradient test system and test.It according to velocity of plunger, the barometric gradient of fully developed flow region, Oral incision, plunger interface dimensions etc., is calculated the value of main flow field shear stress and shear rate.Driving its control system control motor of motor of core rod rotor motion by setting oscillating waveform, motor drives the motion of ring-crack ventilation mouth die core rod rotor oscillating, and open one's mouth material between die slot gap of core rod rotor banding produces longitudinal stack oscillating flow field.The circumferential moment of torsion of core rod rotor circumference Torque Measuring System test wrapper slit die core rotor.Moment of torsion according to core rod rotor and frequency of oscillation, and the size etc. of barrel and core rod rotor, be calculated the value of shear stress, shear strain and the shear rate in superimposed oscillation flow field, it is possible to be calculated various Transient networks further.
The data that the value of the barometric gradient of fully developed flow region can record according to the pressure sensor being placed in porch, annulus, calculated in conjunction with annular gap size.In this case, the rotor using different length is needed to carry out end correction.
The data that the value of the barometric gradient of fully developed flow region records also dependent on the pressure sensor of fully developed flow region in being placed in annulus, are calculated in conjunction with annular gap size.In this case, it is not necessary to carry out end correction.
The torque sensor of the Torque Measuring System of core rod rotor may be mounted at motor and rotor junction.In this case, when calculating the shear stress in superimposed oscillation flow field, need to use the rotor of different length to carry out end correction, and carry out the rotary inertia correction that no load test carries out rotor.
Also can divide the rotor into part and the part without end effect of end effect, the torque sensor of the Torque Measuring System of core rod rotor is placed between this two parts, and the moment of torsion in the middle of core rod rotor without end effect part only tested by such torque sensor.In this case, when calculating the shear stress in superimposed oscillation flow field, it is not necessary to carry out end correction, but be intended to carry out the rotary inertia correction that no load test carries out rotor.
The waveform of core rod rotor oscillating can be controlled, can be sine wave, sawtooth pattern ripple, square wave or random wave etc., also can be the above-mentioned waveform of uniform rotation superposition, the uniform rotation of rotor is also seen as a kind of special oscillation mode, i.e. uniform rotation superposition amplitude and frequency is the vibration of zero.The shape of core rod rotor can be but not limited to cylinder.
Device involved in the present invention, can reach but be not limited to following test scope and precision: main flow field shear rate adjustable extent is 10-2 ~ 105s-1, the frequency-adjustable scope of oscillatory shear component is 10-3Hz~102Hz, < 1 μ rad, < 1 μ Nm, temperature range is room temperature ~ 400 ° C, temperature stability < 0.1 ° of C of +/-to moment of torsion resolution ratio to angular displacement resolution ratio.
Brief description
Fig. 1 is the test device schematic diagram of the present invention.
Fig. 2 is the schematic diagram that pressure sensor described in the embodiment of the present invention is placed in ring-crack ventilation mouth die porch.
Fig. 3 is the schematic diagram that pressure sensor described in the embodiment of the present invention is placed in fully developed flow region.
Fig. 4 is the schematic diagram that torque sensor described in the embodiment of the present invention is arranged on motor and rotor junction.
Fig. 5 is the schematic diagram that torque sensor is arranged between core rod rotor two parts.
Description of reference numerals: the 1st, plunger；2nd, barrel；3rd, ring-crack ventilation mouth die；4th, material；5th, fully developed flow region；6th, core rod rotor；7th, temperature sensor；8th, it is placed in the pressure sensor of ring-crack ventilation mouth die porch；9th, it is placed in the pressure sensor of fully developed flow region；10th, it is arranged on the torque sensor of motor and rotor junction；11st, it is arranged on the torque sensor between core rod rotor two parts.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described.But protection scope of the present invention must not believe that and is confined to following detailed description of the invention.For person of an ordinary skill in the technical field, under the basic premise without departing from present inventive concept, can also make some simple deductions or equivalent, these equivalents still will be considered within protection scope of the present invention.
The core texture of the test device of invention is made up of plunger the 1st, barrel 2 and core rod rotor 6, and barrel is built with material 4.The space that barrel 2 and core rod rotor 6 surround jointly is ring-crack ventilation mouth die 3.Heater is installed on barrel 2, carries out closed-loop control according to the temperature value that temperature sensor 7 records, it is ensured that stream constant temperature in experimentation.After barrel 2 reaches the temperature setting, test material 4 is added barrel, and waits material 4 temperature stabilization in design temperature.The control system control motor driving the motor of plunger presses setting speed motion, the stream in motor pushing sliding cylinder extrusion barrel, by ring-crack ventilation mouth die 3, forms the main flow field of high-rate of shear.Ring-crack ventilation mouth die 3 is segmented into three parts, and inlet region is unstable with outlet area stream, has end effect, and mid portion is fully developed flow region 5.The fully developed flow region axial pressure gradient of circumferential weld fully developed flow region axial pressure gradient test system and test.It according to velocity of plunger, the barometric gradient of fully developed flow region, Oral incision, plunger interface dimensions etc., is calculated the value of main flow field shear stress and shear rate.Driving the control system control motor of motor 11 of core rod rotor motion by setting oscillating waveform, motor drives core rod rotor 6 oscillating movement, and core rod rotor 6 drives the material between mouth die gap to produce longitudinal stack oscillating flow field.The circumferential moment of torsion of core rod rotor circumference Torque Measuring System test wrapper slit die core rotor.Moment of torsion according to core rod rotor 6 and frequency of oscillation, and the size etc. of barrel 2 and core rod rotor 6, be calculated the value of shear stress, shear strain and the shear rate in superimposed oscillation flow field, it is possible to be calculated various Transient networks further.
Circumferential weld fully developed flow region axial pressure gradient can test, according to the pressure sensor 8 being placed in ring-crack ventilation mouth die porch, the force value obtaining, and is calculated in conjunction with annular gap size.This situation first only with a pressure sensor, needs the rotor using different length to carry out end correction.
Circumferential weld fully developed flow region axial pressure gradient also can test, according to the pressure sensor 9 being placed in fully developed flow region, the force value obtaining, and is calculated in conjunction with annular gap size.In this case two pressure sensors are at least needed, it is not necessary to carry out end correction.
The Torque Measuring System of core rod rotor 6 can use the torque sensor 10 being arranged on motor and rotor junction.In this case, when calculating the shear stress in superimposed oscillation flow field, need to use the rotor of different length to carry out end correction, and carry out the rotary inertia correction that no load test carries out rotor.
The Torque Measuring System of core rod rotor 6 also can use the torque sensor 12 being arranged between core rod rotor two parts.Dividing the rotor into part and the part without end effect of end effect, the torque sensor of the Torque Measuring System of core rod rotor 6 is placed between this two parts, and the moment of torsion in the middle of core rod rotor 6 without end effect part only tested by such torque sensor.In this case, when calculating the shear stress in superimposed oscillation flow field, it is not necessary to carry out end correction, but be intended to carry out the rotary inertia correction that no load test carries out rotor.
The waveform of core rod rotor 6 vibration can be controlled, can be sine wave, sawtooth pattern ripple, square wave or random wave etc., also can be the above-mentioned waveform of uniform rotation superposition, the uniform rotation of rotor is also seen as a kind of special oscillation mode, i.e. uniform rotation superposition amplitude and frequency is the vibration of zero.The shape of core rod rotor can be but not limited to cylinder.
Device involved in the present invention, can reach but be not limited to following test scope and precision: main flow field shear rate adjustable extent is 10-2 ~ 105s-1, the frequency-adjustable scope of oscillatory shear component is 10-3Hz~102Hz, < 1 μ rad, < 1 μ Nm, temperature range is room temperature ~ 400 ° C, temperature stability < 0.1 ° of C of +/-to moment of torsion resolution ratio to angular displacement resolution ratio.
Claims (8)
1. a high-rate of shear flowing longitudinal stack vibration rheological measurement device, it is characterised in that specifically include that plunger；Drive
The electric motor and controller system of plunger motion；Barrel and temperature control system thereof；Core rod rotor；Drive the electricity of core rod rotor motion
Machine and control system thereof；Circumferential weld fully developed flow region axial pressure gradient tests system；The circumferential torsion-testing system of core rod rotor
System；Software systems；
The space that barrel and core rod rotor surround jointly is ring-crack ventilation mouth die；
Described circumferential weld fully developed flow region axial pressure gradient test system includes pressure sensor and/or the ring of fully developed flow region
Pressure sensor at shape slot entrance；
Described core rod rotor circumference Torque Measuring System includes being arranged on torque sensor and/or the installation of motor and core rod rotor junction
Core rod rotor have end effect part and without part two parts of end effect between torque sensor；
Described temperature control system includes heater and the temperature sensor being arranged on barrel.
2. high-rate of shear flowing longitudinal stack vibration rheological measurement device as claimed in claim 1, it is characterised in that: core rod turns
Sub is cylindrically shaped.
3. the test of the high-rate of shear flowing longitudinal stack vibration rheological measurement device as described in claim 1～2 any one
Method, it is characterised in that:
Material in barrel, under the extruding of plunger, by ring-crack ventilation mouth die, forms the main flow field of high-rate of shear, according to plunger speed
Degree, the barometric gradient of fully developed flow region, Oral incision, plunger interface dimensions, be calculated main flow field shear stress and cut
The value of cutting speed rate；The material between mouth die gap is driven to produce longitudinal stack vibration by the oscillating movement of ring-crack ventilation mouth die core rod rotor
Flow field, the moment of torsion according to core rod rotor and frequency of oscillation, and the size of barrel and core rod rotor, be calculated superimposed oscillation stream
The value of the shear stress of field, shear strain and shear rate, it is possible to be calculated various Transient networks further；Pacify on barrel
Dress heater, it is ensured that stream constant temperature in experimentation；
The torsion-testing of described core rod rotor is installed torque sensor by motor and rotor junction and is recorded；Calculate superimposed oscillation flow field
During shear stress, need the rotor using different length to carry out end correction, and carry out the rotary inertia that no load test carries out rotor
Correction；
Or the moment of torsion in the middle of core rod rotor without end effect part only tested by described torque sensor；Calculate the shearing in superimposed oscillation flow field
During stress, it is not necessary to carry out end correction, but be intended to carry out the rotary inertia correction that no load test carries out rotor.
4. the method for testing of high-rate of shear flowing longitudinal stack vibration rheological measurement device as claimed in claim 3, its feature exists
In: the value of the barometric gradient of fully developed flow region is that basis is placed in the data that the pressure sensor of porch, annulus records,
It is calculated in conjunction with annular gap size, and need the rotor using different length to carry out end correction.
5. the method for testing of high-rate of shear flowing longitudinal stack vibration rheological measurement device as claimed in claim 3, its feature exists
In: the value of the barometric gradient of fully developed flow region is that the pressure sensor of fully developed flow region in basis is placed in annulus is surveyed
The data obtaining, are calculated in conjunction with annular gap size, it is not necessary to carry out end correction.
6. the method for testing of high-rate of shear flowing longitudinal stack vibration rheological measurement device as claimed in claim 3, its feature exists
In: accurately control movement velocity and the run duration of plunger；Heater and temperature sensor are installed, to barrel temperature on barrel
Degree carries out closed-loop control.
7. the method for testing of high-rate of shear flowing longitudinal stack vibration rheological measurement device as claimed in claim 3, its feature exists
In: the waveform of core rod rotor oscillating is controlled, and is sine wave, sawtooth pattern ripple, square wave or random wave, or uniform rotation superposition
Above-mentioned waveform, the uniform rotation of rotor is also seen as a kind of special oscillation mode, i.e. uniform rotation superposition amplitude and frequency
It is the vibration of zero.
8. the method for testing of high-rate of shear flowing longitudinal stack vibration rheological measurement device as claimed in claim 3, its feature exists
In: main flow field shear rate adjustable extent is 10-2～105s-1, the frequency-adjustable scope of oscillatory shear component is 10- 3Hz～102Hz, < 1 μ rad, < 1 μ Nm, temperature range is room temperature～400 DEG C to moment of torsion resolution ratio to angular displacement resolution ratio, temperature
Stability < +/-0.1 DEG C.
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| CN108709828B (en) * | 2018-03-30 | 2023-09-29 | 四川大学 | Rotary extrusion processing rheometer capable of simultaneously measuring polymer pressure and/or shear rheology and rheometry method |
| CN110361297A (en) * | 2018-05-11 | 2019-10-22 | 廊坊立邦涂料有限公司 | A kind of rheometer |
| CN108918347B (en) * | 2018-05-20 | 2019-04-30 | 东北石油大学 | Shear the method to oil-water emulsion process interface free energy contribution in quantitatively characterizing flow field |
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| CN110595947A (en) * | 2019-08-14 | 2019-12-20 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Method for testing vibration rheological property of cement mortar |
| CN111982751A (en) * | 2020-08-10 | 2020-11-24 | 清华大学 | Method for analyzing shear thickening characteristic of cement-based material |
| CN112179809B (en) * | 2020-09-18 | 2021-12-10 | 清华大学 | Method and system for obtaining wall surface slip curve based on parallel plate rheological test |
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