CN206362626U - A kind of high polymer dehumidification point device for accurately measuring - Google Patents
A kind of high polymer dehumidification point device for accurately measuring Download PDFInfo
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- CN206362626U CN206362626U CN201621334846.XU CN201621334846U CN206362626U CN 206362626 U CN206362626 U CN 206362626U CN 201621334846 U CN201621334846 U CN 201621334846U CN 206362626 U CN206362626 U CN 206362626U
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Abstract
The utility model is related to a kind of high polymer dehumidification point device for accurately measuring, including TT＆C system and the interior Material Testing Machine provided with loading system, described loading system includes material and loads test chamber and compensated cavity, high-precision differential pressure pick-up is installed between two chambers, provided with upper in material loading test chamber, lower clamp, wherein upper fixture is connected with force snesor, lower clamp is connected to one and loaded from material in the connecting rod that test chamber bottom end seal is passed, the lower end of connecting rod is connected with a synchronization transmission structure, a compensation bar is penetrated from the bottom end seal of compensated cavity, the bottom body of rod for compensating bar is connected with synchronization transmission structure and the motor-driven crossbeam of the testing of materials simultaneously, the motor-driven crossbeam of the testing of materials can be moved up and down under TT＆C system control.It is of the present utility model simple in construction, easy to operate, one directional tensile test is carried out available for the high polymer such as solid propellant sample, the measurement demand of high polymer key mechanics performance parameter is met.
Description
Technical field
The utility model belongs to composite material test engineering device technique field, is related to a kind of high polymer dehumidification point and accurately measures dress
Put, can carrying out the test of the high polymer dehumidification point mechanical property parameters such as solid propellant with this device, there is provided the mechanics of high polymer
The foundation that performance quality judges.
Background technology
High polymer refers to the HMW for repeating to be formed by connecting by covalent bond by many identicals, simple construction unit
Compound, is widely used in including in the Material Field including hard-core technology.For example as the important composition of solid propellant rocket
Partial solid propellant is made up of polymeric matrix and scattered solid packing therein, belongs to a kind of high polymer, and it is both hair
The energy of motivation, is the structural material of engine again, and the quality of its performance and the stability that solid engines work are closely bound up.
When high polymer body is produced deformation by external force effect, relative motion occurs for polymer particles intergranular, and then in bonding
Stress is produced between adhesive surface between agent and filler., will between partial filler particle and adhesive when stress is sufficiently large
There is bond damage, or adhesive destruction is occurring at solid particle, so that vacuum hole is produced inside propellant, and
And can further reduce the bond energy between adhesive and filler, this microeffect is " dehumidification ".As " dehumidification " phenomenon adds
Vacuum aperture sizes inside play, high polymer tend to further increase, when reaching certain degree (several microns), will play
The effect of micro- destruction, produces crackle in adhesive, ultimately results in high polymer body and is broken.
Volumetric expansion can occur for high polymer while generation due to " dehumidification ", therefore by testing the volumetric expansion of high polymer
It can accurately judge that " dehumidification " starts stress, the strain produced.For the technology such as with regard to foregoing solid propellant, to long-term
Solid propellant dehumidification point mechanical property parameters are tested under storage requirement, can be the structural integrity for judging solid propellant
Property provide foundation, can be with the state of Scientific evaluation solid propellant and life-span, for solid propellant rocket quasi-instrument facility
Performance Evaluation and lengthen the life significant.Current this area does not carry out still accurate to the high polymer such as solid propellant dehumidification point
Measurement apparatus and standard, it is impossible in real time, accurately test " dehumidification " stress (σ), strain (ε) and body of the high polymer in drawing process
The physical parameters such as product change (Δ V).
Utility model content
The problem of the purpose of this utility model is to have prior art solve there is provided one kind it is simple in construction, behaviour
Work is convenient, can meet accurate to the high polymer dehumidification point of the measurement demand of the high polymer key mechanics performance parameter such as solid propellant
Measurement apparatus.
To realize that the technical solution that above goal of the invention is used is as described below.
A kind of high polymer dehumidification point device for accurately measuring, including TT＆C system and Material Testing Machine, in Material Testing Machine
Provided with loading system, there is described loading system material to load peace between test chamber and compensated cavity two chambers, two chambers
Equipped with high-precision differential pressure pick-up, the upper fixture and lower folder for being provided with test chamber and being used for clamping high polymer sample are loaded in material
Tool, wherein upper fixture and be arranged on material loading test chamber upper top force snesor be connected, lower clamp be connected to one along erect
Loaded to from material in the connecting rod that passes of test chamber bottom end seal, one of the lower end of connecting rod and a secondary synchronization transmission structure
Driving end connect, vertically sealed from the bottom of compensated cavity and penetrate a compensation bar, compensate bar the bottom body of rod simultaneously with it is synchronous
Another driving end of drive mechanism and a Material Testing Machine are moved crossbeam and are connected, and the motor-driven crossbeam of the testing of materials can be in observing and controlling
Moved up and down under system control.
In above-mentioned high polymer dehumidification point device for accurately measuring, material loading test chamber and compensated cavity are closed chamber,
It is that dynamic sealing is combined between material loading test chamber and connecting rod and between compensated cavity and compensation bar, it is ensured that two chambers
Sealing effectiveness.
In above-mentioned high polymer dehumidification point device for accurately measuring, being provided with compensated cavity is used to adjust compensated cavity cavity volume
Micrometer, adjusts the cavity volume of compensated cavity so that test chamber and compensated cavity cavity volume phase by turn micrometer in work
Deng.
In above-mentioned high polymer dehumidification point device for accurately measuring, the cross-sectional area of connecting rod and the cross-sectional area of compensation bar
Respectively S1 and S2, and S1=S2.
In above-mentioned high polymer dehumidification point device for accurately measuring, synchronization transmission structure, should using the drive mechanism of flexible connection
The drive mechanism of flexible connection has a switching crossbeam laterally set, and a cross pass is respectively provided with the two ends of switching crossbeam
Bearings, constitute two driving ends of synchronization transmission structure, and connecting rod and compensation bar pass through cross oscillating bearing and transmission respectively
Two driving ends of structure are connected.
Design of the present utility model comes from Clapyron Equation：PV=nRT, when temperature, gaseous mass are constant, envelope
Close in container the pressure of gas and gas volume inversely.When carrying out specific high polymer sample one directional tensile test,
Sample is fixed in the upper lower clamp in closed material loading test chamber, when the motor-driven crossbeam of the testing of materials provides displacement load
Afterwards, volume of sample is expanded with the axial tension of connecting rod, and material can be caused to load gas volume change in test chamber, and then
Cause intracavitary air pressure change, the functional relation that intracavitary air pressure changes with volume of sample is set up according to this relation；By in material
Pressure difference between high-precision differential pressure pick-up, measurement two chambers is installed between loading test and compensated cavity；And then by surveying
The situation of change of air pressure in material loading test chamber is measured, the Volume Changes of sample are calculated, so as to realize sample stress σ, answer
Measured while becoming ε, tri- physical parameters of change in volume Δ V, strain-stress and strain-Volume Changes are drawn on this basis
Curve, realizes the collection and processing of sensor signal and the control of Material Testing Machine by TT＆C system again afterwards, and with it is upper
Machine software is communicated and shown by display module, is finally reached and the high polymer sample dehumidification point such as solid propellant is accurately surveyed
The purpose of amount.
The utility model has an advantageous effect in that：
(1) the utility model proposes high polymer dehumidification point device for accurately measuring can reach 1%~2% overall measurement
Precision, measurement apparatus uses gas expansion meter principle, and high polymer volume of sample is realized indirectly by measuring gas medium pressure
Measurement.Because volume of sample is less than the volume of testing of materials intracavity gas medium, and own vol change value is limited, because
This, volume of sample change can only cause the small change of gas medium air pressure in test chamber.The utility model passes through rational public
Formula is derived, and the dynamic measurement of chamber absolute pressure is avoided as far as possible, and introduces other measurement parameters for being easier to realize, using high accuracy
Absolute pressure sensor is measured to chamber initial static air pressure, using high-precision differential pressure pick-up realize test chamber and reference cavity it
Between differential pressure high-acruracy survey, pass through rational backoff algorithm so that swell increment phase of the differential pressure variable quantity only with high polymer sample
Close, so as to immediately arrive at high polymer volume of sample variable quantity.
(2) the utility model proposes high polymer dehumidification point device for accurately measuring use and be made up of compensated cavity and compensation bar
Special atmospheric pressure compensating module, is compensated using compensation bar and reference cavity to air pressure change caused by connecting rod displacement, is excluded
Influence of the connecting rod displacement to air pressure change, the change of differential pressure pick-up registration is only to be sent out by sample in sample drawing process
Raw " dehumidification " phenomenon is that volumetric expansion is caused, so as to reduce volume of sample measured deviation.
(3) the utility model proposes high polymer dehumidification point device for accurately measuring pass through to process and prepare high-precision dynamic sealing knot
Structure realizes the constant mass control of test chamber in-vivo medium, it is ensured that test device chamber in-vivo measurement mass of medium is constant, realizes examination
The high-acruracy survey of sample Volume Changes.
(4) the utility model proposes high polymer dehumidification point device for accurately measuring can be used for studying, evaluate, judging that solid is pushed away
Enter " dehumidification " performance of the high polymers such as agent under simple tension stress, can be contour to solid propellant poly- according to the performance
The mechanical property quality of thing carries out rational judgment, so that guidance is provided to the high polymer such as solid propellant formula development, to judge
The structural intergrities of the high polymers such as solid propellant provides foundation, the state of the high polymer such as Scientific evaluation solid propellant and life-span
In terms of it is significant, high polymer class field of compound material have advance, have a extensive future, economic benefit is good
It is good.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model Material Testing Machine and loading system part.
Fig. 2 is the cross-sectional view of material loading test chamber and compensated cavity.
Fig. 3 is the global design scheme block diagram of the utility model TT＆C system.
Fig. 4 is the fundamental diagram of TT＆C system structure of the present utility model.
The title of each numeral mark is respectively in accompanying drawing：1- force snesors, 2- upper fixtures, 3- samples, 4- differential pressures are passed
Sensor, 5- lower clamps, 6- materials loading test chamber, 7- compensated cavities, 8- connecting rods, 9- compensation bars, 10- Material Testing Machine
Dynamic crossbeam, 11- Material Testing Machine, 12- micrometers, 13- synchronization transmission structures, 14-O type circles, 15- poly (methyl methacrylate) plates,
16- cross oscillating bearings, 17- switching crossbeams.
Embodiment
It is described in the utility model including TT＆C system and Material Testing Machine 11 referring to accompanying drawing, in Material Testing Machine 11
Provided with loading system, for carrying out the one directional tensile test of high polymer sample 3 and realizing the measurement of major parameter.Material Testing Machine and
The structure of loading system is as shown in figure 1, wherein loading system includes material loading 7 two working chambers of test chamber 6 and compensated cavity
Room, the high-precision differential pressure pick-up 4 that the high-acruracy survey that can realize gas medium pressure is provided between two chambers is (poor
The measurement range of pressure sensor 4 is 0~± 3KPa, and measurement accuracy is ± 0.2%FS)；Provided with use in material loading test chamber 6
In the force snesor 1 and upper fixture 2 and lower clamp 5 for clamping high polymer sample 3 of measurement axial tension, wherein with upper folder
The force snesors 1 of the connection of tool 2 are arranged on the top that material loads test chamber 6, and high polymer sample 3 is placed in test chamber, by it is upper,
Lower clamp 2,5 is fixed；The upper end of connecting rod 8, which is vertically sealed, to be penetrated in material loading test chamber 6 and is connected with lower clamp 5, even
The lower end of extension bar 8 is connected with a driving end of synchronization transmission structure 13；Vertically sealed from the bottom of compensated cavity 7 and penetrate one
Bar 9 is compensated, the bottom body of rod of compensation bar 9 is connected on another driving end of synchronization transmission structure 13, compensates the extension of bar 9
Also it is connected simultaneously with the motor-driven crossbeam of the testing of materials of Material Testing Machine bottom 10, by the motor-driven crossbeam 10 of the testing of materials in observing and controlling system
System control is lower to provide the displacement load that connecting rod moves up and down.
In the utility model structure, material loading test chamber 6 and compensated cavity 7 are by the close of 2Cr13 stainless steel materials
The chamber closed, material loading test chamber 6 ensures two chambers with compensation bar 9 with connecting rod 8 and compensated cavity 7 using dynamic sealing
Sealing effectiveness, it is desirable to material load ensure in test chamber 6 clamping sample 3 upper and lower fixture 2,5 can non-resistance freely move
It is dynamic.The cross-sectional structure of two chambers is as shown in Fig. 2 the upper lid of chamber uses poly (methyl methacrylate) plate 15, and is carried out by O-ring 14
Sealing, realizes two chambers interior visualization, is easy to observe in test sample deformation situation.
In the utility model structure, compensated cavity 7 and the compensation composition atmospheric pressure compensating module of bar 9 can be carried out to the displacement of connecting rod 8
Compensation, excludes influence of the displacement of connecting rod 8 to air pressure change, and the cross-sectional area of connecting rod 8 is S1, compensates the transversal of bar 9
Face area is S2, S1=S2.Micrometer 12 is provided with using movable sealing structure on compensated cavity 7；Pass through thousand points of turn in work
The cavity volume of the adjustable compensation chamber 7 of chi 12 so that material loading test chamber 6 is equal with the cavity volume of compensated cavity 7.Micrometer
12 regulation compensated cavity 7 cavity volume scopes are 0mm3~1000mm3, resolution ratio is 0.5mm3.Only when the two cavity volume is equal
When and high polymer sample 3 occur before " dehumidification " phenomenon (when i.e. the volume of high polymer sample 3 is not inflated), and in connecting rod 8 and
Bar 9 is compensated while under situation of movement, the registration of differential pressure pick-up 4 just can guarantee that constantization, and the displacement of connecting rod 8 is entered so as to reach
Row compensates to exclude influence of the displacement of connecting rod 8 to air pressure change.In process of the test, if the registration of differential pressure pick-up 4 changes,
I.e. caused by the volumetric expansion of high polymer sample 3.
In the utility model structure, connecting rod 8 and compensation bar 9 are connected by the synchronization transmission structure 13 laterally set, are examined
Considering needs to keep connecting rod 8 in drawing process and compensates the perpendicularity of the axial direction of bar 9, it is to avoid the influence of side force, Synchronous Transmission knot
Structure 13 therefore the drive mechanism for using flexible connection, the drive mechanism of the flexible connection have a switching crossbeam laterally set
17, a cross oscillating bearing 16 is respectively provided with the two ends of switching crossbeam, two driving ends of synchronization transmission structure, connection are constituted
Bar 8 and compensation bar 9 are connected by cross oscillating bearing 16 with synchronization transmission structure 13 (switching crossbeam 17), it is ensured that in drawing process
Vertical stress and it is synchronized with the movement.
The operation principle of TT＆C system structure of the present utility model is as shown in Figure 4.It is by material testing machine control module, bag
Containing the composition such as test module, data acquisition module and host computer processing module including each road sensor.Material testing machine control
Module is standard electric minor universal testing machine control module, interior to be provided with material testing machine control device, for realizing high polymer sample
Simple tension, communicated between material testing machine control device and host computer by RS-232 serial ports, PC control software
Send control of the control instruction realization to Material Testing Machine, including parameter setting (rate of extension, stretching travel), operation, stopping
Deng instruction.Measurement module mainly includes various kinds of sensors, for realizing the measurement of each physical quantity and the output of measurement signal.
According to the actual measurement needs of measurement apparatus, sensor 1 in addition to differential pressure pick-up 4, force snesor outside, may also include absolute pressure sensing
Device, temperature sensor and displacement transducer etc., sensor are powered by linear power supply is unified, and output signal is converged through signal converting module
Collection.Differential pressure pick-up 4 is used for the differential pressure change for measuring material loading test chamber 6 and compensated cavity 7, and force snesor 1, which is used to measure, to be tried
Pulling force in sample drawing process, absolute pressure sensor is used for the inner chamber air pressure pressure for monitoring reference cavity and test chamber, temperature sensor
It then can be used for the change of monitoring measuring environment temperature.Data acquisition module includes data collecting card, for realizing that sensor is exported
The collection of signal, transmits to rear end host computer and is handled, upper computer software is calculated gathered data, obtains the body of sample
Product changing value, realizes propellant sample stress, strain, the synchro measure of three physical quantitys of Volume Changes, and then drafting is strained-answered
Power and strain-Volume Changes curve, are shown by display, complete the accurate measurement of high polymer dehumidification point.
Test process of the present utility model is as follows：
1st, experiment prepares
A) prepared by high polymer sample：High polymer sample 3 use Type B dumbbell specimen, sample prepare and deposit according to
The section of GJB770B-2005 methods 413.1 5.1 requires to carry out.
B) experimental condition：
Experiment is carried out under normal temperature and pressure environment, according to code requirement, and test temperature is ± 2 DEG C of 25 DEG C (or 20 DEG C)；Draw
Stretch speed 500mm/min, 100mm/min, 20mm/min, 2mm/min, 0.5mm/min.
2nd, device is calibrated：
A) measurement apparatus air-tight test.Ensure that measurement apparatus is air tight, airtight sexual satisfaction test requirements document.
B) measurement apparatus replica test.Ensure that measurement apparatus has good repeatability, disclosure satisfy that test requirements document.
C) volume leveling is tested.Micrometer is provided with using movable sealing structure on compensated cavity, adjusted by turn micrometer
Compensated cavity cavity volume so that test chamber and compensated cavity cavity volume are equal.
D) measurement apparatus rating test.The accuracy of confirmatory measurement measurement device result.
3rd, test procedure：
A) temperature-controlling system is adjusted, sample constant temperature at least 40min can be tested.
B) checkout facility device, reaches suitable working condition, the regulation motor-driven crossbeam 10 of the testing of materials is suitable
Position, it is desirable to which times clip position is appropriate in test chamber 6 when sample 3 is tested.
C) initial volume of high polymer sample 3 is measured.
D) measure ground atmosphere measuring and record.
E) area in three sections in upper, middle and lower in sample parallel-segment is measured, its minimum value is taken as experiment initial cross sectional
Product, and measurement data is input in upper computer software.
F) it is elastic appropriate by the good sample 3 of constant temperature on fixture, make the longitudinal axis and upper and lower fixture 2,5 of sample 3
The line of centres is overlapped, and prevents deviation pulling force and sample distortion.
G) leakage test chamber, fixed stretch rod and the motor-driven crossbeam of the testing of materials.
H) testing machine parameter is set, starts testing machine, is tested, data acquisition is carried out with depositing by data collecting system
Storage, upper computer software calculated gathered data, obtains the volume changes value of sample, realize propellant sample stress, strain,
The synchro measure of three physical quantitys of Volume Changes, draws strain-stress and strain-Volume Changes curve, passes through display module
Display.
Claims (5)
1. a kind of high polymer dehumidification point device for accurately measuring, including TT＆C system and Material Testing Machine (11), in Material Testing Machine
(11) loading system is provided with, it is characterised in that：There is described loading system material to load test chamber (6) and compensated cavity (7)
High-precision differential pressure pick-up (4) is installed, being provided with material loading test chamber (6) is used between two chambers, two chambers
The upper fixture (2) and lower clamp (5) of high polymer sample (3) are clamped, wherein upper fixture (2) is with being arranged on material loading test chamber
(6) force snesor (1) of upper top be connected, lower clamp (5) be connected to one vertically from material loading test chamber (6) bottom it is close
Seal in the connecting rod (8) passed, the lower end of connecting rod (8) is connected with a driving end of a secondary synchronization transmission structure (13), from
The bottom of compensated cavity (7), which is vertically sealed, penetrates a compensation bar (9), and the bottom body of rod of compensation bar (9) is while and Synchronous Transmission
Another driving end of structure (13) and a Material Testing Machine are moved crossbeam (10) and are connected, the motor-driven crossbeam of the testing of materials (10)
It can be moved up and down under TT＆C system control.
2. high polymer dehumidification point device for accurately measuring according to claim 1, it is characterised in that：Material loads test chamber
(6) and compensated cavity (7) is closed chamber, between material loading test chamber (6) and connecting rod (8) and compensated cavity (7) and
It is that dynamic sealing is combined between compensation bar (9).
3. high polymer dehumidification point device for accurately measuring according to claim 1, it is characterised in that：Set on compensated cavity (7)
There is the micrometer (12) for adjusting compensated cavity (7) cavity volume.
4. high polymer dehumidification point device for accurately measuring according to claim 1, it is characterised in that：Connecting rod (8) it is transversal
The cross-sectional area of face area and compensation bar (9) is respectively S1 and S2, and S1=S2.
5. high polymer dehumidification point device for accurately measuring according to claim 1, it is characterised in that：Synchronization transmission structure (13)
Using the drive mechanism of flexible connection, the drive mechanism of the flexible connection has a switching crossbeam (17) laterally set,
The two ends of switching crossbeam (17) are respectively provided with a cross oscillating bearing (16), constitute two driving ends of synchronization transmission structure, even
Extension bar (8) and compensation bar (9) are connected by cross oscillating bearing with two driving ends of drive mechanism respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621334846.XU CN206362626U (en) | 2016-12-07 | 2016-12-07 | A kind of high polymer dehumidification point device for accurately measuring |
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| CN201621334846.XU CN206362626U (en) | 2016-12-07 | 2016-12-07 | A kind of high polymer dehumidification point device for accurately measuring |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109813600A (en) * | 2019-02-01 | 2019-05-28 | 中国人民解放军国防科技大学 | In-situ stretching-based method for determining dehumidification point of particle-reinforced composite material |
| CN110567815A (en) * | 2019-09-24 | 2019-12-13 | 中国科学院武汉岩土力学研究所 | precision measurement test device and method for Poisson's ratio of shallow soft sediment |
| CN111198131A (en) * | 2019-12-04 | 2020-05-26 | 西安航天三沃机电设备有限责任公司 | Measuring device and measuring method for volume expansion characteristic of material under tensile load |
-
2016
- 2016-12-07 CN CN201621334846.XU patent/CN206362626U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109813600A (en) * | 2019-02-01 | 2019-05-28 | 中国人民解放军国防科技大学 | In-situ stretching-based method for determining dehumidification point of particle-reinforced composite material |
| CN110567815A (en) * | 2019-09-24 | 2019-12-13 | 中国科学院武汉岩土力学研究所 | precision measurement test device and method for Poisson's ratio of shallow soft sediment |
| CN111198131A (en) * | 2019-12-04 | 2020-05-26 | 西安航天三沃机电设备有限责任公司 | Measuring device and measuring method for volume expansion characteristic of material under tensile load |
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