CN106323772A - Gripping device for testing pull-power property of low intensity hydrogel - Google Patents
Gripping device for testing pull-power property of low intensity hydrogel Download PDFInfo
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- CN106323772A CN106323772A CN201610640439.XA CN201610640439A CN106323772A CN 106323772 A CN106323772 A CN 106323772A CN 201610640439 A CN201610640439 A CN 201610640439A CN 106323772 A CN106323772 A CN 106323772A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention belongs to the technical field of functional macromolecule and experimental mechanics, and provides a gripping device for testing pull-power property of low intensity hydrogel. The device includes a dumbbell shaped mould, a gripping device A applied to a reciprocally moving testing machine and accessories thereof, or includes a dumbbell shaped mould, a gripping device B applied to a reciprocally moving testing machine and accessories thereof; different gripping devices correspond to different accessories. The reciprocally moving testing machine applies static, dynamic load to hydrogel samples, and finishes curve measurement for power and displacement. The present invention has the effects and benefits that the pull provided by the gripping device when pulling to the gripping head of hydrogel samples, replaces in the original method the adhesive force of using glue, whose main component is cyanoacrylate, to stick the hydrogel sample on the gripping device. The present invention enhances the measurement accuracy for the pull-power property of low intensity hydrogel. The device has strong controllability, operates conveniently and fast, and is simple for production and promotion.
Description
Art
The invention belongs to functional high molecule material and Experimental Mechanics technical field, relate to the mechanical property of hydrogel, especially
Relate to a kind of clamping device testing low-intensity hydrogel tensile mechanical properties and method.
Background technology
Hydrogel is the polymer that a class has three-dimensional net structure, can absorb large quantity of moisture and swelling in water, and
Can continue to after swelling keep its original structure to be not dissolved.By to the physicochemical property of hydrogel and biological characteristics
Carry out careful design, make hydrogel have biocompatibility, bioadhesive, biological degradability and controlled mechanical property and medicine
Thing slow release characteristic, it is possible to altitude simulation natural extracellular matrix environment in vitro, vital movement and the tissue regeneration to cell
Cheng Jinhang Reasonable Regulation And Control.In recent years, hydrogel has been applied to the many aspects of biomedical sector, some low-intensity hydrogels
Clinical medicine it has been successfully applied to (such as corneal graft, viscosity replacement therapy treatment osteoarthritis such as hyaluronic acid gel
Deng), the reconstruction of cardiac valve, nerve etc. it is mainly used at present in field of tissue engineering technology.These hydrogels are in use
It is required for accurately measuring its mechanical property to guarantee that it adapts with physiological mechanical environment.Hot strength is the important of hydrogel
Mechanical property parameters, the stretching experiment method of current hydrogel is primarily adapted for use in the ultra-drawn hydrogel of high intensity of modification, will
Hydrogel uses stretching clamp grab tensile after being fabricated to the hydrogel sample of regular shape.And mechanical property more weak (stretching and
Compressive strength is respectively less than 1MPa) hydrogel, owing to intensity is relatively low, chucking power is crossed conference and is caused hydrogel sample to destroy；Clamping
When power is too small, owing to the coefficient of friction of hydrogel is little and hydrogel easily oozes out moisture and increases hydrogel specimen surface lubrication, stretching
Time hydrogel sample easily depart from from clamping device, so being difficult to be formed effectively clamping.A kind of current conventional method is to use
Hydrogel sample is bonded on fixture by the glue being mainly composed of cyanoacrylate, for guaranteeing between hydrogel sample and fixture
It is in close contact, needs before general test to apply precompression.Firstly, since cyanoacrylate glue smear layer thickness, it is at water
In gel sample, length of penetration is all difficult to predict and control, and easily causes bonding part stress raisers, destroys from bonding part；Its
Secondary, during with tool sharpening hydrogel sample, cut and small wound can be formed at cutting surfaces, to low-intensity hydrogel
Speech, these surface defects can directly affect the verity of mechanics the performance test results.Additionally, all need fixture before and after testing every time
Being carried out removing cyanoacrylate (typically requiring use organic solvent), technique is loaded down with trivial details, time-consuming, laborious.
Summary of the invention
In order to overcome the deficiency of existing low-intensity hydrogel stretching experiment method, the present invention provides a kind of test low-intensity
The clamping device of hydrogel tensile mechanical properties and method, the present invention utilizes homemade dumbbell shape mould to be prepared as by hydrogel mute
The hydrogel sample of bell type, then with the holder hydrogel sample corresponding with dumbbell shape mould, accurately test hydrogel sample
Hot strength, the present invention may be used for testing the creep of hydrogel and the lax mechanical property of stretching, reduces due to cyanoacrylate
Acid esters glue connects the problem of stress concentration caused and makes the surface defect problem of hydrogel sample formation of cutter, convenient, fast,
Easily operation.The clamping device of present invention design and method are also applied for the stretching mechanical property testing of high intensity hydrogel.
In order to achieve the above object, the technical scheme is that
A kind of clamping device testing low-intensity hydrogel tensile mechanical properties includes homemade dumbbell shape mould, applies
Move back and forth the fixture A on testing machine and appurtenances, or include dumbbell shape mould, apply on reciprocating motion testing machine
Fixture B and appurtenances, the appurtenances difference that fixture difference is corresponding.
Described dumbbell shape mould is divided into upper, middle and lower three part, two halves mould symmetry fasten, with bolt, two halves mould is solid
It is scheduled on together, becomes revolution shape, use polyethylene film back cover, hydrogel is injected molding in it.
The cylinder that middle part is hollow of described dumbbell shape mould, 67 times of its a length of interior diameter.Act on thing
The borderline self balancing force system in the body two ends power system of zero (i.e. make a concerted effort be all with resultant moment) away from active region, two ends (apart from long-range
Size in this local action district) middle part produce stress, can regard as simple tension produce the homogeneous state of stress.Long
Footpath ratio is more than 6 times, it becomes possible to ensures Uniform Tension, the most so can guarantee that the pulling force suffered by intermediate parallel length position is uniform
Pulling force, and to occur in the likelihood ratio of centre relatively big at tension failure position, reaches the requirement of standard tensile test.To rectificate in theory
Footpath ratio is the bigger the better, but in view of the deformation of hydrogel, length is the longest, and the cross-sectional area after deformation differs with original cross-sectional area
The biggest, the error caused is the most increasing, and therefore the scope of draw ratio is advisable in 67.
Described dumbbell shape mould upstream is made up of top and bottom, and bottom is funnel type, and top is the cylinder of hollow.
The interior diameter of described dumbbell shape mould upstream top hollow circular cylinder is in the middle part of dumbbell shape mould the 2 of cylindrical interior diameter
Be advisable for 3 times, too small, stretching time hydrogel sample easily slide from fixture or depart from, excessive, may make hydrogel two ends with in
Between to compare gap excessive at position, cause in use middle part to be easily destroyed.Described dumbbell shape mould upstream top
The thickness of hollow circular cylinder is 1.5 2 times of cylindrical interior diameter in the middle part of dumbbell shape mould and is advisable, too small then upper end circle
The very thin thickness of cylinder, is easily deformed during stretching, from fixture depart from, excessive, can produce equally hydrogel two ends with in
Between position compare the problem that gap is excessive, cause in use middle part to be easily destroyed.
The height of described dumbbell shape mould upstream bottom funnel is the interior diameter of hollow circular cylinder in the middle part of dumbbell shape mould
1.5 2 times be advisable, the gradient of too low then funnel is the most slow, easily forms stress and concentrates, too high, can lengthen hydrogel sample
Length, strengthens experimental error.Funnel type bottom is connected with transition arcs with the one end in the middle part of dumbbell shape mould, and funnel type bottom is with mute
Bell mould top connects.In order to ensure there is one section of smooth changeover portion, it is to avoid stress is concentrated, and the radius of described transition arcs is
It is advisable for 12 times of cylindrical interior diameter in the middle part of dumbbell shape mould, if ratio is too small, then can not be connected or radian with radian
Peaceful slow, still can produce problem of stress concentration, if ratio is excessive, cause dumbbell shape mould long, length is the longest, after deformation
Cross-sectional area differ the biggest with original cross-sectional area, the error caused is the most increasing, simultaneously also wastes material.
The bottom of described dumbbell shape mould is full symmetric with top.
If fixture is fixture A, described clamping device includes dumbbell shape mould, moving beam 1, upper fixture joint 2, pin
Nail 3, fixture A, hydrogel sample 5, lower clamp joint 7 and workbench 8；Described fixture A includes upper end-fixture A 4 and lower end folder
Tool A 6.
Described upper fixture joint 2 is the middle part hollow circular cylinder with pin-and-hole, is fixed on the shifting moving back and forth testing machine
Below dynamic crossbeam 1；Described upper end-fixture A 4 is fastened by two hemihedrism, includes upper and lower two parts after fastening, and top is Intermediate Gray
Having the hollow circular cylinder of pin-and-hole, top is connected by pin 3 is fixing with upper fixture joint 2, bottom and the top of dumbbell shape mould
Form fit.Described lower clamp joint 7 is the middle part hollow circular cylinder with pin-and-hole, is fixed on the work moving back and forth testing machine
In station 8；Described lower end fixture A 6 is fastened by two hemihedrism, includes upper and lower two parts after fastening, and bottom is middle with pin
The hollow circular cylinder in hole, bottom is connected by pin 3 is fixing with lower clamp joint 7, and top is joined with dumbbell shape mould lower shape
Close.Fixture is chimeric with lower clamp joint 7 with the upper fixture joint 2 on moving beam for convenience, clamp strap pin-and-hole end outer directly
Footpath size is than the little 1mm of inner diameter size of upper fixture joint 2.Described hydrogel sample 5 is by the dumbbell shape of three-dimensional revolving body
Mould pours and forms, and hydrogel sample 5 passes through bottom and the top fixed clamp of lower end fixture A 6 of upper end-fixture A 4.
If fixture is fixture B, described clamping device includes dumbbell shape mould, moving beam 1, upper fixture joint 2, pin
Nail 3, hydrogel sample 5, lower clamp joint 7, workbench 8, stretching clamp 9, bolt 10, movable intermediate plate 11, upper end-fixture B 12,
Lower end fixture B 13.Described fixture B includes upper end-fixture B 12, lower end fixture B 13.
Described upper fixture joint 2 is the middle part hollow circular cylinder with pin-and-hole, is fixed on the shifting moving back and forth testing machine
Below dynamic crossbeam 1；Described stretching clamp 9 is made up of upper and lower two parts, and top is the solid cylinder with pin-and-hole, and top leads to
Crossing that pin 3 is fixing with upper fixture joint 2 to be connected, bottom is made up of, by swivel bolt 10 up time bolt 10 and activity intermediate plate 11
Pin and rotating counterclockwise, can control moving forward and backward of movable intermediate plate 11, reaches the compression to clamping article and unclamps.Institute
Upper end-fixture B 12 stated is fastened by two hemihedrism, includes upper and lower two parts after fastening, and top is a flat board, top and stretching
Fixture 9 is clamped and connected, and bottom coordinates with the shaped upper part of dumbbell shape mould.Described lower clamp joint 7 is that middle part is with pin-and-hole
Hollow circular cylinder, be fixed on move back and forth testing machine workbench 8 on；Described lower end fixture B 13 is by two hemihedrism buttons
Close, include after fastening that upper and lower two parts, top coordinate with dumbbell shape mould lower shape, bottom is a flat board, bottom with draw
Stretching fixture 9 to be clamped and connected, stretching clamp 9 is connected by pin 3 is fixing with lower clamp joint 7.Described hydrogel sample 5 is by three
The dumbbell shape mould of dimension revolving body pours and forms, and hydrogel sample 5 passes through bottom and the lower end fixture B 13 of upper end-fixture B 12
Top fixed clamp.
Because low-intensity hydrogel main component is water (up to 95%), makes the dumbbell shape mould of hydrogel sample and enter
Fixture A and the material of fixture B that row stretching experiment uses have first had to corrosion resistance requirement；Secondly, some hydrogel needs heat
Processing preparation, temperature is generally about 95 DEG C, and the material of selection to have the fusing point of more than 300 DEG C, and makes hydrogel sample
The thermal coefficient of expansion of dumbbell shape mould is less than 30E-6/K just can ignore experimental error；Additionally, the stretching of low-intensity hydrogel is strong
Degree is generally less than 1MPa, in order to reduce experimental error, hot strength more than the 100MPa to be reached of fixture A and fixture B.
The making of dumbbell shape mould and fixture finished surface to reach certain smooth degree, mould inner surface roughness Ra
Value is below 10 μm, it is ensured that making hydrogel sample completely, is tried one's best with carrying out the smooth surface of hydrogel sample during stretching experiment
Reduce the experimental error that hydrogel specimen surface integrity degree brings.The portion being connected with reciprocating motion testing machine of fixture A and fixture B
The size of position sets according to the size of reciprocating motion testing machine used.Comprehensive requirements above, it is possible to use alloy type material etc. are made
Make dumbbell shape mould and fixture.
Use above-mentioned hot strength test experiments clamping device to carry out the experimental technique of hydrogel static stretch, specifically include
Following steps:
Step one, makes hydrogel sample 5
In order to increase the integrity degree on hydrogel sample 5 surface, reduce the surface defect caused when peeling off mould, first by two halves
The oil that the inner surface brush last layer of mould is very thin, forms one layer of oil film the thinnest, increases lubrication, and oil film thickness gets over Bao Yuehao, then
Two halves mould symmetry is fastened, seals bottom with polyethylene film, the hole on the tablet outside both mold ends is inserted into
Bolt is tightened fixing, becomes an entirety, within it injects the hydrogel solution prepared, by hydrogel sample after standing molding
Take out, first retain the oils and fats of hydrogel specimen surface, so can avoid the dehydration of hydrogel specimen surface in experimentation and hard
Change, it is also possible to the probability damage that hydrogel specimen surface is caused by minimizing fixture or other article, hydrogel when testing
The oils and fats of two ends head retaining part is wiped, it is to avoid during stretching, hydrogel sample two ends retaining part excessively lubricates from fixture sliding
Go out.
Step 2, installs hydrogel sample 5
1) if using fixture A, first hydrogel sample 5 upper end is enclosed within the bottom of upper end-fixture A4, upper end-fixture A4 top
It is connected, with adhesive tape by upper end-fixture A4 by pin 3 is fixing with the upper fixture joint 2 moved back and forth on testing machine moving beam 1
The position of clamping hydrogel sample 5 is fixed, and the force value tested by testing machine resets, and gets rid of the shadow of hydrogel sample self gravitation
Ring.Hydrogel sample 5 lower end is enclosed within the top of lower end fixture A6, allows hydrogel sample 5 and lower end fixture A6 be kept upright shape
State, the mobile moving beam 1 moving back and forth testing machine is until the lower section of lower end fixture A6 is positioned at reciprocating motion testing machine workbench 8
On lower clamp joint 7 above at 2cm, then with less speed controlling cross beam movement, when pin-and-hole and the lower end of lower clamp joint 7
When the pin-and-hole of fixture A6 is completely superposed, insert pin 3, with adhesive tape, the position of lower end fixture A6 clamping hydrogel sample 5 fixed,
Now hydrogel sample installation.
2) if using fixture B, the most respectively by stretching clamp 9 by pin 3 and the upper fixture joint 2 moving back and forth testing machine
Fix with lower clamp joint 7 and be connected.Hydrogel sample 5 upper end is enclosed within the bottom of upper end-fixture B 12, with adhesive tape, upper end is pressed from both sides
Tool B 12 clamps the position of hydrogel sample 5 and fixes, and the retaining part of stretching clamp 9 is put on the top of upper end-fixture B 12, logical
Crossing the bolt 10 that turns clockwise makes movable intermediate plate 11 compress the top of upper end-fixture B 12, and the force value tested by testing machine resets,
Get rid of the impact of hydrogel sample self gravitation.Hydrogel sample 5 lower end is enclosed within the top of lower end fixture B 13, will with adhesive tape
The position that lower end fixture B 13 clamps hydrogel sample 5 is fixed, and allows hydrogel sample 5 and lower end fixture B 13 be kept upright shape
State, the mobile moving beam 1 moving back and forth testing machine is until the lower section of lower end fixture B 13 is positioned at and is connected with lower clamp joint 7
Above stretching clamp 9 at 2cm, then with less speed controlling cross beam movement, until the bottom of lower end fixture B 13 enters stretching
The retaining part of fixture 9, makes movable intermediate plate 11 compress the bottom of lower end fixture B 13, in order to really by the bolt 10 that turns clockwise
When protecting experiment, the direction of pulling force is mutually perpendicular to the cross section of hydrogel sample, the top upper surface of upper end-fixture B 12 and lower end
The lower, underside face of fixture B 13 to be fitted completely with stretching clamp 9, so can guarantee that the top upper surface of upper end-fixture B 12
Parallel with the lower, underside face of lower end fixture B 13, pulling force during experiment is vertical with hydrogel sample cross, reduces experiment by mistake
Difference.Now hydrogel sample installation.
Step 3, starts and moves back and forth testing machine, uses displacement control mode, carries out stretching experiment, make hydrogel sample 5
Producing stretcher strain, until destroying, recording power, displacement curve simultaneously.
Step 4, if continuing experiment, locking moves back and forth testing machine, takes off fixture and clear up hydrogel sample, according still further to
Above-mentioned steps is tested again.If experiment terminate, close move back and forth testing machine take off fixture and clear up hydrogel sample and
Fixture, closes computer.
The invention has the beneficial effects as follows, with the dumbbell shape Mold Making dumbbell shape hydrogel sample of standard of design, and
Devising the fixture coordinated with dumbbell shape hydrogel sample, when utilizing stretching, hydrogel sample two ends clamping head is provided by fixture
Pulling force replace original drawing process using the glue being mainly composed of cyanoacrylate be bonded to by hydrogel sample
Cohesive force on fixture, provides the most feasible stretching experiment method for low-intensity hydrogel；It also avoid due to cyano group third
Olefin(e) acid ester gum connects the problem of stress concentration caused and makes, with cutter, the surface defect problem that hydrogel sample is formed, and improves low
The accuracy of intensity hydrogel stretching mechanical property testing.Apparatus of the present invention and method is applied widely, controllability is strong, operation just
Victory, is applicable to the stretching experiment of low-intensity hydrogel, it is also possible to for the lax mechanical property of creep and stretching testing hydrogel
Energy.Clamping device of the present invention is with low cost, it is simple to produces and promotes.
Accompanying drawing explanation
Fig. 1 is hydrogel sample and fixture A profile；
Fig. 2 is hydrogel sample and fixture B profile；
Fig. 3 is the profile of dumbbell shape mould；
Fig. 4 is the three dimensional structure schematic diagram of fixture A；
Fig. 5 is the three dimensional structure schematic diagram of fixture B；
In figure: 1 moving beam；Fixture joint on 2；3 pins；4 upper end-fixture A；5 hydrogel samples；6 lower end fixture A；7
Lower clamp joint；8 workbench；9 stretching clamps；10 bolts；11 movable intermediate plates；12 upper end-fixture B；13 lower end fixture B.
Detailed description of the invention
The present invention will be further described below in conjunction with the accompanying drawings.
A kind of clamping device testing low-intensity hydrogel tensile mechanical properties, this clamping device includes homemade dumbbell shape
Mould, fixture A and appurtenances, or include dumbbell shape mould, fixture B and appurtenances；In view of cost factor, described
Dumbbell shape mould, fixture A and fixture B make of aluminium alloy.
Described dumbbell shape mould two halves mould symmetry fastens and forms, as shown in the profile of Fig. 3 dumbbell shape mould, described
The upper and lower two-part both sides of two halves mould of dumbbell shape mould have the pertusate flat board of Intermediate Gray, two halves mould is symmetrical
It is inserted into bolt at hole after fastening to tighten, fixing mould.The middle part of dumbbell shape mould is hollow circular cylinder, its a length of interior directly
6 times of footpath；Described dumbbell shape mould upstream is made up of the bottom of top and funnel type, and top is hollow circular cylinder；Described
Bottom is connected with dumbbell shape mould upstream top, and bottom is connected with transition arcs with the one end in the middle part of dumbbell shape mould；Described mistake
Crossing the radius of arc is in the middle part of dumbbell shape mould the 1.5 of cylinder interior diameter；Described dumbbell shape mould upstream top hollow circuit cylinder
The interior diameter of body is 2 times of cylindrical interior diameter in the middle part of dumbbell shape mould；Described dumbbell shape mould upstream top hollow circle
The thickness of cylinder is 2 times of cylindrical interior diameter in the middle part of dumbbell shape mould；Described dumbbell shape mould upstream bottom funnel
It it is highly 1.5 times of the interior diameter of hollow circular cylinder in the middle part of dumbbell shape mould；The bottom of described dumbbell shape mould is complete with top
Holohedral symmetry；
If fixture is fixture A, as Figure 1 and Figure 4, described upper fixture joint 2 and lower clamp joint 7 are middle part
With the hollow circular cylinder of pin-and-hole, upper fixture joint 2 is fixed on below the moving beam 1 moving back and forth testing machine, and lower clamp connects
7 are fixed on workbench 8；Described upper end-fixture A4 top is the middle hollow circular cylinder with pin-and-hole, and pin is passed through on top
Nail 3 is fixing with upper fixture joint 2 to be connected, and bottom coordinates with the shaped upper part of dumbbell shape mould.Described fixture A 6 bottom, lower end
For centre with the hollow circular cylinder of pin-and-hole, bottom is fixing with lower clamp joint 7 to be connected, top and the bottom shape of dumbbell shape mould
Shape coordinates.Described hydrogel sample 5 is poured by dumbbell shape mould and forms, the hydrogel sample 5 bottom by upper end-fixture A 4
Top fixed clamp with lower end fixture A 6.
If fixture is fixture B, as shown in Fig. 2, Fig. 5, described upper fixture joint 2 and lower clamp joint 7 are middle part
With the hollow circular cylinder of pin-and-hole, upper fixture joint 2 is fixed on below the moving beam 1 moving back and forth testing machine, and lower clamp connects
7 are fixed on workbench 8；Described stretching clamp 9 is made up of upper and lower two parts, and top is the solid cylinder with pin-and-hole
Body, is fixed by pin 3 be connected with upper fixture joint 2 and lower clamp joint 7, and bottom is made up of bolt 10 and movable intermediate plate 11,
By advance or the retrogressing of swivel bolt 10 control activity intermediate plate 11；Described upper end-fixture B 12 and lower end fixture B 13 are by two
Hemihedrism fastens, and all includes upper and lower two parts after fastening；The top of described upper end-fixture B 12 clamps with stretching clamp 9 bottom
Connecting, bottom coordinates with the shaped upper part of dumbbell shape mould；Under the top of described lower end fixture B 13 and dumbbell shape mould
Portion's form fit, bottom is clamped and connected with stretching clamp 9 bottom；Described hydrogel sample 5 is poured by dumbbell shape mould and forms,
By bottom and the top fixed clamp of lower end fixture B 13 of upper end-fixture B 12.
Low-intensity hydrogel static stretch experimental technique:
Step one, makes hydrogel sample: in order to increase the integrity degree of hydrogel specimen surface, reduces and makes when peeling off mould
The surface defect become, first by oil very thin for the inner surface brush last layer of two halves mould, forms one layer of oil film the thinnest, increases profit
Sliding, oil film thickness gets over Bao Yuehao, then two halves mould symmetry is fastened, and seals bottom with polyethylene film, outside both mold ends
Tablet on hole be inserted into bolt and tighten fixing, become an entirety, within it inject the hydrogel solution prepared,
After standing molding, hydrogel sample is taken out, first retain the oils and fats of hydrogel specimen surface, so can avoid water in experimentation
The dehydration of gel specimen surface and hardening, it is also possible to the probability that hydrogel specimen surface is caused by minimizing fixture or other article
Damage, when testing wipes the oils and fats of hydrogel two ends head retaining part, it is to avoid hydrogel sample two ends clamping during stretching
Position excessively lubricates and skids off from fixture.
Step 2, installs hydrogel sample
1) if using fixture A, first hydrogel sample 5 upper end is enclosed within the bottom of upper end-fixture A4, upper end-fixture A4 top
It is connected, with adhesive tape by upper end-fixture A4 by pin 3 is fixing with the upper fixture joint 2 moved back and forth on testing machine moving beam 1
The position of clamping hydrogel sample 5 is fixed, and the force value tested by testing machine resets, and gets rid of the shadow of hydrogel sample self gravitation
Ring.Hydrogel sample 5 lower end is enclosed within the top of lower end fixture A6, allows hydrogel sample 5 and lower end fixture A6 be kept upright shape
State, the mobile moving beam 1 moving back and forth testing machine is until the lower section of lower end fixture A6 is positioned at reciprocating motion testing machine workbench 8
On lower clamp joint 7 above at 2cm, then with less speed controlling cross beam movement, when pin-and-hole and the lower end of lower clamp joint 7
When the pin-and-hole of fixture A6 is completely superposed, insert pin 3, with adhesive tape, the position of lower end fixture A6 clamping hydrogel sample 5 fixed,
Now hydrogel sample installation.
2) if using fixture B, the most respectively by stretching clamp 9 by pin 3 and the upper fixture joint 2 moving back and forth testing machine
Fix with lower clamp joint 7 and be connected.Hydrogel sample 5 upper end is enclosed within the bottom of upper end-fixture B 12, with adhesive tape, upper end is pressed from both sides
Tool B 12 clamps the position of hydrogel sample 5 and fixes, and the retaining part of stretching clamp 9 is put on the top of upper end-fixture B 12, logical
Crossing the bolt 10 that turns clockwise makes movable intermediate plate 11 compress the top of upper end-fixture B 12, and the force value tested by testing machine resets,
Get rid of the impact of hydrogel sample self gravitation.Hydrogel sample 5 lower end is enclosed within the top of lower end fixture B 13, will with adhesive tape
The position that lower end fixture B 13 clamps hydrogel sample 5 is fixed, and allows hydrogel sample 5 and lower end fixture B 13 be kept upright shape
State, the mobile moving beam 1 moving back and forth testing machine is until the lower section of lower end fixture B 13 is positioned at and is connected with lower clamp joint 7
Above stretching clamp 9 at 2cm, then with less speed controlling cross beam movement, until the bottom of lower end fixture B 13 enters stretching
The retaining part of fixture 9, makes movable intermediate plate 11 compress the bottom of lower end fixture B 13, in order to really by the bolt 10 that turns clockwise
When protecting experiment, the direction of pulling force is mutually perpendicular to the cross section of hydrogel sample, the top upper surface of upper end-fixture B 12 and lower end
The lower, underside face of fixture B 13 to be fitted completely with stretching clamp 9, so can guarantee that the top upper surface of upper end-fixture B 12
Parallel with the lower, underside face of lower end fixture B 13, pulling force during experiment is vertical with hydrogel sample cross, reduces experiment by mistake
Difference.Now hydrogel sample installation.
Step 3, starts reciprocating motion testing machine, uses displacement control mode, carries out stretching experiment, makes sample produce and draws
Stretching deformation, until destroying, recording power, displacement curve.
Step 4, if continuing experiment, locking moves back and forth testing machine, takes off fixture and clear up hydrogel sample, according still further to
Above-mentioned steps is tested.If experiment terminates, close reciprocating motion testing machine and take off fixture and clear up hydrogel sample and fixture,
Close computer.
Claims (6)
1. the clamping device testing low-intensity hydrogel tensile mechanical properties, it is characterised in that this clamping device includes certainly
Dumbbell shape mould, fixture A and the appurtenances of system, or include dumbbell shape mould, fixture B and appurtenances；
Described described dumbbell shape mould is used for making hydrogel sample (5), two halves mould symmetry fasten, be divided into after fastening
Three parts under in, inject molding in it by hydrogel after back cover；
The middle part of described dumbbell shape mould is hollow circular cylinder, 67 times of its a length of interior diameter, it is ensured that intermediate parallel is long
Degree pulling force suffered by position is uniform tension；Described dumbbell shape mould upstream is made up of the bottom of top and funnel type, top
For hollow circular cylinder, described one end, bottom is connected with dumbbell shape mould upstream top, in the middle part of the other end and dumbbell shape mould
One end connects with transition arcs；The radius of described transition arcs is 12 times of cylinder interior diameter in the middle part of dumbbell shape mould, it is to avoid
Stress is concentrated；The interior diameter of described dumbbell shape mould upstream top hollow circular cylinder is cylindrical interior in the middle part of dumbbell shape mould
23 times of diameter, the thickness of top hollow circular cylinder is 1.5 2 times of cylindrical interior diameter in the middle part of dumbbell shape mould；Institute
Height is the interior diameter of hollow circular cylinder in the middle part of dumbbell shape mould 1.5 2 times of the dumbbell shape mould upstream bottom funnel stated；
The bottom of described dumbbell shape mould is full symmetric with top；
If fixture is fixture A, described clamping device includes dumbbell shape mould, moving beam (1), upper fixture joint (2), pin
Nail (3), fixture A, hydrogel sample (5), lower clamp joint (7) and workbench (8)；Described fixture A includes upper end-fixture A
And lower end fixture A (6) (4)；
Described upper fixture joint (2) and lower clamp joint (7) are the middle part hollow circular cylinder with pin-and-hole, upper fixture joint
(2) being fixed on moving beam (1) lower section of reciprocating motion testing machine, lower clamp joint (7) is fixed on workbench (8)；Described
Upper end-fixture A (4) fastened by two hemihedrism, include upper and lower two parts after fastening, top is the hollow circular cylinder with pin-and-hole,
Top is connected by pin (3) and upper fixture joint (2) are fixing, and match clamping with the top of dumbbell shape mould in bottom；Described
Lower end fixture A (6) fastened by two hemihedrism, include upper and lower two parts after fastening, bottom is the hollow circular cylinder with pin-and-hole,
Bottom is connected by pin (3) and lower clamp joint (7) are fixing, and match clamping with dumbbell shape mould bottom on top；Described
Hydrogel sample (5) is poured by dumbbell shape mould and forms, and hydrogel sample (5) passes through upper end-fixture A (4) and lower end fixture A (6)
Fixed clamp；
If fixture is fixture B, described clamping device includes dumbbell shape mould, moving beam (1), upper fixture joint (2), pin
Nail (3), hydrogel sample (5), lower clamp joint (7), workbench (8), stretching clamp (9), bolt (10), movable intermediate plate
(11), upper end-fixture B (12), lower end fixture B (13)；Described fixture B includes upper end-fixture B (12), lower end fixture B (13)；
Described upper fixture joint (2) and lower clamp joint (7) are the hollow circular cylinder with pin-and-hole, upper fixture joint (2)
Being fixed on moving beam (1) lower section, lower clamp joint (7) is fixed on workbench (8)；Described stretching clamp (9) is by up and down
Two parts form, and top is the solid cylinder with pin-and-hole, respectively by pin (3) and upper fixture joint (2) and lower clamp
Joint (7) is fixing to be connected, and bottom is made up of, by swivel bolt (10) control activity intermediate plate bolt (10) and movable intermediate plate (11)
(11) advance or retrogressing；Described upper end-fixture B (12) and lower end fixture B (13) are fastened by two hemihedrism, all wrap after fastening
Include upper and lower two parts；The top of described upper end-fixture B (12) is clamped and connected with stretching clamp (9), bottom and dumbbell shape mould
Match clamping on top；Match clamping, bottom and stretching with dumbbell shape mould bottom on the top of described lower end fixture B (13)
Fixture (9) is clamped and connected；Described hydrogel sample (5) is poured by dumbbell shape mould and forms, by upper end-fixture B (12) and under
End fixture B (13) fixed clamp.
A kind of clamping device testing low-intensity hydrogel tensile mechanical properties the most according to claim 1, its feature exists
In, described dumbbell shape mould, fixture A, fixture B the fusing point of corrosion resistant material more than 300 DEG C.
A kind of clamping device testing low-intensity hydrogel tensile mechanical properties the most according to claim 1 and 2, its feature
Being, the thermal coefficient of expansion of described dumbbell shape mould is less than 30E-6/K；Dumbbell shape mould inner surface roughness Ra value is 10
Below μm.
A kind of clamping device testing low-intensity hydrogel tensile mechanical properties the most according to claim 1 and 2, its feature
Being, described fixture A, the hot strength of fixture B are at more than 100MPa.
A kind of clamping device testing low-intensity hydrogel tensile mechanical properties the most according to claim 3, its feature exists
In, described fixture A, the hot strength of fixture B are at more than 100MPa.
6. the method using the arbitrary described clamping device test low-intensity hydrogel tensile mechanical properties of claim 1-5, its
It is characterised by, comprises the following steps:
Step one, makes hydrogel sample (5)
First by the inner surface brush last layer oil film of two halves mould, then two halves mould symmetry is fastened, after polyethylene film back cover
Form dumbbell shape mould, the hydrogel solution prepared is injected in dumbbell shape mould, by water after hydrogel solution standing molding
Gel sample (5) takes out, and wipes the oils and fats of hydrogel sample (5) two ends retaining part；
Step 2, installs hydrogel sample (5)
1) if using fixture A, first hydrogel sample (5) upper end is fixed on the bottom of upper end-fixture A (4), upper end-fixture A (4)
Top is fixing with upper fixture joint (2) to be connected, and the force value tested by testing machine resets；Again hydrogel sample (5) lower end is fixed
Be kept upright in fixture A (6) top, lower end, hydrogel sample (5) and lower end fixture A (6) state, mobile moving beam (1) when
When the pin-and-hole of the pin-and-hole of lower clamp joint (7) and lower end fixture A (6) is completely superposed, inserting pin (3), hydrogel sample (5) is pacified
Install into；
2) if using fixture B, respectively stretching clamp (9) is fixedly connected on upper fixture joint (2) and lower clamp joint (7)；
Hydrogel sample (5) upper end is fixed on the bottom of upper end-fixture B (12), and stretching clamp is put on the top of upper end-fixture B (12)
(9) retaining part, it is ensured that the two is fitted completely, swivel bolt (10) makes movable intermediate plate (11) compress upper end-fixture B (12)
Top, the force value tested by testing machine resets, and gets rid of the impact of sample self gravitation；Hydrogel sample (5) lower end is fixed on
Are kept upright shape in the top of lower end fixture B (13), it is ensured that the two is fitted completely, hydrogel sample (5) and lower end fixture B (13)
State, the bottom of mobile moving beam (1) to lower end fixture B (13) enters the retaining part of stretching clamp (9), swivel bolt (10)
Movable intermediate plate (11) is made to compress the bottom of lower end fixture B (13), hydrogel sample (5) installation；
Step 3, starts and moves back and forth testing machine, uses displacement control mode, carries out stretching experiment, make hydrogel sample (5) produce
Raw stretcher strain, until destroying, records power, displacement curve simultaneously；
Step 4, if continuing experiment, locking moves back and forth testing machine, takes off fixture and clear up sample, entering according still further to above-mentioned steps
Row is tested again；If experiment terminates, close reciprocating motion testing machine and take off fixture and clear up sample and fixture, close computer.
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| CN201610640439.XA CN106323772A (en) | 2016-08-05 | 2016-08-05 | Gripping device for testing pull-power property of low intensity hydrogel |
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|---|---|---|---|
| CN201610640439.XA CN106323772A (en) | 2016-08-05 | 2016-08-05 | Gripping device for testing pull-power property of low intensity hydrogel |
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