CN110501217A - A kind of creep compression clamp - Google Patents
A kind of creep compression clamp Download PDFInfo
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- CN110501217A CN110501217A CN201910913177.3A CN201910913177A CN110501217A CN 110501217 A CN110501217 A CN 110501217A CN 201910913177 A CN201910913177 A CN 201910913177A CN 110501217 A CN110501217 A CN 110501217A
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- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 238000012669 compression test Methods 0.000 claims description 6
- 238000005452 bending Methods 0.000 claims description 3
- 230000002028 premature Effects 0.000 claims description 3
- 238000011900 installation process Methods 0.000 abstract description 4
- 238000010998 test method Methods 0.000 abstract description 3
- 230000032683 aging Effects 0.000 description 8
- 230000035882 stress Effects 0.000 description 8
- 238000009434 installation Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
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- 238000005070 sampling Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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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
- G01N3/02—Details
- G01N3/04—Chucks
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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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
- G01N2203/0019—Compressive
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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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0071—Creep
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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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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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
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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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
- G01N2203/025—Geometry of the test
- G01N2203/0252—Monoaxial, i.e. the forces being applied along a single axis of the specimen
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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
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0266—Cylindrical specimens
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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
- G01N2203/0423—Chucks, fixtures, jaws, holders or anvils using screws
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Abstract
The present invention provides a kind of creep compression clamps, including commutator, commutator includes upper holder block and lower lock block, the bottom surface of upper holder block and the top surface of lower lock block are respectively arranged with the upper lower Positioning holes of the triangular prism shape protruded into for sample end, the position of the corresponding above lower Positioning holes of upper lower lock block side wall, which is respectively arranged with to be equipped with out of the external fastener hole up and down for penetrating through supreme lower Positioning holes, upper and lower fastener hole, holds out against component along sample transverse direction abutting sample.Present invention optimizes the sample depth of parallelisms with compression clamp center during the installation process, it is ensured that sample in compression process to neutrality, reduce the difference of left and right deflection, improve test accuracy.Proof stress range is expanded, ensure that the repeatability, integrality and the safety of operation of test data.Test procedure is simplified, test period is saved, greatly reduces the usage amount of sample and the access times of machine, be more energy-saving and environmentally friendly.
Description
Technical field
The present invention relates to creep test equipment, especially a kind of creep compression clamp.
Background technique
With the rapid development of China's industry, creep age forming technology is also constantly improving, creep age forming skill
Art is the main forming technique of the large-scale siding such as aircraft, rocket, is carrying out actual creep age forming to materials such as aluminium alloys
Before, generally creep age forming emulation can be carried out with finite element software, most suitable practical forming is determined by software emulation
Scheme.And before carrying out creep age forming emulation to material, the croop property of material is tested, the most commonly used is creeps
Material to be tested is processed into sample by testing machine, by specimen clamping between the up-down stretch bar of creep testing machine, is being set
Creep ageing temperature in creep stretching or compression test are carried out to sample, to obtain the stretching or compression creep amount of sample, into
And the creep curve of material is obtained, to be supplied to creep age forming simulation model, and when eventually for instructing actual creep
Effect forming.
When existing creep testing machine carries out creep compression test to sample, generally tested using bar samples, stick
Shape sample both ends are provided with external screw thread, and the connection type of bar samples both ends and compression clamp is that direct or indirect screw thread revolves
It connects, a kind of creep compression test device as disclosed in Chinese patent 201910244627.4, sample upper end and upper holder block screw thread
Connection, lower end are threadedly coupled with taper locator, and taper locator is positioned by the taper hole on lower lock block, to enhance the centering of sample
Property.Also there can be installation gap when being screwed on due to screw thread, sample still can exist slight in pressurized process
A possibility that double swerve, not good enough to neutrality, the left and right deflection of sample has certain difference, shadow during creep ageing test
Therefore the accuracy for ringing test data needs a kind of better scheme, in the prior art to solve this problem.
Summary of the invention
It is an object of that present invention to provide a kind of creep compression clamps, to solve the problems, such as to propose in background technique.
A kind of creep compression clamp, including hold out against component one, hold out against component two and for being connected to creep testing machine or more
Commutator between connector, the commutator includes upper holder block and lower lock block, along creep test between upper holder block and lower lock block
The draw direction of machine maintains the spacing for installing sample, and the distance values can adjust, when the spacing becomes smaller for pair
Sample provides the operation of creep compression-loaded, for unloading sample when the spacing can become larger；
The bottom surface of the upper holder block is provided with the upper location hole of the triangular prism shape protruded into for sample upper end, the top surface of lower lock block
The lower Positioning holes of the triangular prism shape protruded into for sample lower end, upper location hole and lower Positioning holes are provided with along the stretching of creep testing machine
Bar axial direction is aligned and the two position, profile and size are all the same, and the inner surface of upper location hole and lower Positioning holes is smooth
The inscribed cylinder diameter of surface and the two is greater than the diameter of sample end to be protruded into, so that sample smoothly protrudes into；
The position of the corresponding upper location hole of the upper holder block side wall is provided with from the external upper fastener hole for penetrating through supreme location hole,
The axial line of the upper fastener hole intersects with an incline of upper location hole, be provided in upper fastener hole it is described hold out against component one,
It holds out against axial direction of the component one for along upper fastener hole and pushes against sample upper end outer wall, make sample upper end and upper location hole another two
Side wall is bonded and is formed tangent positional relationship and is locked, and the intersection of the two side walls is the axial line with upper fastener hole
The incline of intersection；
The position that the lower lock block side wall corresponds to lower Positioning holes is provided with the lower fastener hole from external perforation to lower Positioning holes,
The axial line of the lower fastener hole intersects with an incline of lower Positioning holes, be provided in lower fastener hole it is described hold out against component two,
Hold out against component two pushes against sample lower end outer wall for the axial direction along lower fastener hole, makes the two of sample lower end and lower Positioning holes
A side wall is bonded and is formed tangent positional relationship and is locked, and the intersection of the two side walls is the axle center with lower fastener hole
The incline of line intersection；
The axial line of the upper fastener hole and lower fastener hole is located at same flat with the stretch rod axial direction of creep testing machine
In capable plane so that sample upper and lower ends respectively by held out against component one with hold out against component two end push against and respectively and up and down
When location hole is tangent, the sample top and bottom are also located just at same parallel with the stretch rod axial direction of creep testing machine
Plane in, to realize the centering of sample, prevent sample premature bending in creep compression test.
Preferably, the axial line of the upper fastener hole and an incline of upper location hole intersect vertically, the axis of lower fastener hole
Heart line and an incline of lower Positioning holes intersect vertically.
Further, the upper fastener hole and lower fastener hole are tapped threaded hole, it is described hold out against component one with
Holding out against component two is to hold out against component one with externally threaded bolt or screw and hold out against component two respectively in upper fastener hole under
Sample is fastened respectively towards the direction precession close to sample in fastener hole.
Preferably, the depth of the upper location hole and lower Positioning holes is less than or equal to the length of the end of sample to be protruded into,
And the depth of the upper location hole and lower Positioning holes is greater than or equal to the 1/2 of the tip lengths of sample to be protruded into, to guarantee clamping
Firmness, and will not influence connection of the sample up and down at lug with device of extending.
Further, the commutator further include upper guide rod, lower guide rod, the upper stretch rod above upper holder block with
Upper link block, and lower stretch rod and lower connecting block below lower lock block, the upper end of upper stretch rod is for connecting creep examination
The upper binding head of machine is tested, the lower end of upper stretch rod is fixedly connected with upper link block, and the lower end of lower stretch rod is for connecting creep examination
The lower union joint of machine is tested, the upper end of lower stretch rod is fixedly connected with lower connecting block, the upper guide rod company of sequentially passing through from top to bottom
Connect the pilot hole being arranged on block, top board and lower platen, position is threaded through leading of being arranged on upper holder block among the upper guide rod
Xiang Kongzhong, upper guide rod upper end is with the shaft shoulder and the end is fixedly connected with upper link block by nut one, and upper guide rod lower end is worn
Nut two is connected with after crossing the pilot hole on lower lock block；Lower guide rod sequentially pass through from bottom to up lower connecting block, lower platen with it is upper
The pilot hole being arranged on pressing plate, the lower guide rod centre position are threaded through in the pilot hole being arranged on lower lock block, lower guide rod
Upper end is connected with nut three after passing through the pilot hole on upper holder block, lower guide rod lower end with the shaft shoulder and the end by nut four with
Lower connecting block is fixedly connected.Upper holder block and lower lock block can guide rod slides up and down relatively, be used between upper holder block and lower lock block
The spacing of installation sample can manually adjust.
The present invention at least has the advantages that
The present invention by changing the installation way between compression clamp and bar samples, solve during compression creep test by
Installation gap between sample and compression clamp keeps sample poor to neutrality, causes sample or so modified difference away from larger, creep compliance
The problem of measurement accuracy difference, present invention is mainly applied to measure the micro-strain when test of uniaxial compression creep ageing, the present invention
It can solve following problem:
1, the depth of parallelism of the sample during the installation process with compression clamp center is optimized, it is ensured that sample is in compression process
To neutrality, reduces the difference of left and right deflection, the measurement accuracy of micro-strain can be significantly improved.
2, solve causes aging time to be unable to reach test in the case where higher stress is horizontal since sample easily bends
It is required that the problem of, proof stress range is expanded, the integrality of test data is ensure that, provides for scientific research and more fully try
Test result.
3, reduce sample in compression process unstability and bending a possibility that, keep the stability of sample preferable, it is good
It ensure that the safety to test a machine.And the accuracy and favorable repeatability of test measurement data, it avoids using previous compression
The phenomenon that test need to be repeated several times when fixture, simplify test procedure, save test period, greatly reduce sample usage amount and
The access times of machine, are more energy-saving and environmentally friendly.
It, can be by the external screw thread knot at existing bar samples both ends when being tested using creep compression clamp of the invention
Structure is changed to smooth cylindrical-shaped structure, for protruding into upper lower Positioning holes, on the one hand can increase connecing between sample and location hole
Contacting surface product, enhances the clamping firmness of sample, on the other hand can reduce the step of sample is machined to experience needed for finished product, saves people
Work and cost.
Other than objects, features and advantages described above, there are also other objects, features and advantages by the present invention.
Below with reference to figure, the present invention is described in further detail.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the creep compression clamp integral installation structure chart of the preferred embodiment of the present invention；
Fig. 2 is the details enlarged drawing at the creep compression clamp specimen clamping position of the preferred embodiment of the present invention；
Fig. 3 is the internal sectional structure figure at the creep compression clamp specimen clamping position of the preferred embodiment of the present invention；
Fig. 4 be the deflection tested of first group of first time compression creep test that is carried out with existing compression clamp at any time
Between change curve；
Fig. 5 be the deflection tested of first group of second of compression creep test that is carried out with existing compression clamp at any time
Between change curve；
Fig. 6 is that the second group of compression creep test carried out with the creep compression clamp of this hair invention preferred embodiment obtains
Deflection changes over time curve graph；
Fig. 7 is that the third group compression creep test carried out with the creep compression clamp of this hair invention preferred embodiment obtains
Deflection changes over time curve graph.
In figure: 1- upper holder block, the upper location hole of 11-, the upper fastener hole of 12-, the upper guide rod of 13-, 14- upper stretch rod connect on 15-
Connect block, 16- nut one, 17- nut three, 2- lower lock block, 21- lower Positioning holes, fastener hole under 22-, guide rod under 23-, 24- drop-down
Boom, 25- lower connecting block, 26- nut two, 27- nut four, 3- sample, 4- hold out against component one, and 5- holds out against component two.
Specific embodiment
The embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention can be limited according to claim
Fixed and covering multitude of different ways is implemented.
Referring to a kind of creep compression clamp of FIG. 1 to FIG. 3, including holds out against component 1, holds out against component 25 and for connecting
The commutator between head (i.e. upper binding head and lower union joint, be not shown in the figure), commutator packet are vertically connected in creep testing machine
Upper holder block 1 and lower lock block 2 are included, the draw direction between upper holder block and lower lock block along creep testing machine is maintained for installing sample
3 spacing, and the distance values can adjust under the driving of creep testing machine, the spacing can become smaller and be used to provide sample
The operation of creep compression-loaded, spacing can become larger and be used to unload sample 3；In the present embodiment, the upper and lower ends outer wall of sample 3 is arranged
There is external screw thread.
The bottom surface of upper holder block is provided with the upper location hole 11 of the triangular prism shape protruded into for sample upper end, and the top surface of lower lock block is set
The lower Positioning holes 21 of the triangular prism shape protruded into for sample lower end, upper location hole and lower Positioning holes are equipped with along the stretching of creep testing machine
Bar axial direction alignment and the two position, profile and size are all the same, the inner surface of upper location hole and lower Positioning holes is smooth and two
The inscribed circle diameter of person is greater than the diameter of sample end to be protruded into；In the present embodiment, the cross section of upper location hole and lower Positioning holes
It is equilateral triangle.
The position of the corresponding upper location hole of upper holder block side wall is provided with from the external upper fastener hole 12 for penetrating through supreme location hole, institute
The axial line for stating fastener hole intersects with an incline of upper location hole, is provided in upper fastener hole and holds out against component 1, holds out against portion
The end of part one pushes against bar samples upper end outer wall along the axial direction of upper fastener hole, makes the end of thread and upper positioning on bar samples
Hole another two side wall is bonded and is formed tangent positional relationship, and the intersection of the two side walls is the axial line with upper fastener hole
The incline of intersection；
The position that lower lock block side wall corresponds to lower Positioning holes is provided with the lower fastener hole 22 from external perforation to lower Positioning holes, under
The axial line of fastener hole intersects with an incline of lower Positioning holes, is provided in lower fastener hole and holds out against component 25, holds out against component two
End push against bar samples lower end outer wall along the axial direction of lower fastener hole, make the end of thread and lower Positioning holes under bar samples
Two side walls are bonded and are formed tangent positional relationship, and the intersection of the two side walls intersects to be described with the axial line of lower fastener hole
Incline；
In the present embodiment, the axial line of upper fastener hole and lower fastener hole is horizontally disposed and is located at same and creep examination
It tests in the parallel plane of stretch rod axial direction of machine, so that sample upper and lower ends are held out against component one respectively and hold out against component two
When pushing against and is tangent with upper lower Positioning holes respectively, the sample top and bottom are also located just at same and creep testing machine drawing
In the parallel plane of boom axial direction, to realize the centering of sample, prevent sample premature curved in creep compression test
It is bent.
In the present embodiment, the axial line of upper fastener hole and a prismatic surface of upper location hole intersect vertically, with the prismatic surface
Axial line of the opposite incline also with upper fastener hole intersects vertically, the axial line of lower fastener hole and a prismatic surface of lower Positioning holes
It intersects vertically, axial line of the incline opposite with the prismatic surface also with lower fastener hole intersects vertically.
In the present embodiment, the depth of the upper location hole and lower Positioning holes is equal to the length of sample end to be protruded into, to protect
The firmness of clamping is demonstrate,proved, and will not influence the connection at sample or more lug with device of extending.
In the present embodiment, commutator further includes upper guide rod 13, lower guide rod 23, the upper stretch rod above upper holder block
14 with upper link block 15, and lower stretch rod 24 below lower lock block and lower connecting block 25, the upper end of upper stretch rod is used for
The upper binding head of creep testing machine is connected, the lower end of upper stretch rod is fixedly connected with upper link block, and the lower end of lower stretch rod is used for
Connect the lower union joint of creep testing machine, the upper end of lower stretch rod is fixedly connected with lower connecting block, upper guide rod from top to bottom according to
The secondary pilot hole being arranged on upper link block, top board and lower platen, the upper guide rod centre position are threaded through upper holder block
In the pilot hole of upper setting, upper guide rod upper end is with the shaft shoulder and the end is fixedly connected with upper link block by nut 1, on
Guide rod lower end is connected with nut 2 26 after passing through the pilot hole on lower lock block.Lower guide rod sequentially passes through lower connection from bottom to up
The pilot hole being arranged on block, lower platen and top board, the lower guide rod centre position are threaded through the guiding being arranged on lower lock block
Kong Zhong, lower guide rod upper end are connected with nut 3 17 after passing through the pilot hole on upper holder block, lower guide rod lower end with the shaft shoulder and
The end is fixedly connected by nut 4 27 with lower connecting block.Upper holder block and lower lock block can guide rod slides up and down relatively, upper pressure
It can be manually adjusted between block and lower lock block for installing the spacing of sample 3.
In the present embodiment, holds out against component one and hold out against component two and be all made of the bolt with Hexagon hole.
When specimen clamping, sample upper and lower ends are respectively put into the positioning hole up and down of triangular prism shape, up and down the two of sample
After the inner bottom surface of end face and upper lower Positioning holes completely attaches to, the hexagon socket head cap screw in upper and lower fastener hole for locking is screwed, is utilized
Sample both ends are locked at the positioning hole of triangular prism by the locking method of top-closed structure radial force, are completed sample at this time and are changed
Connection to device, because upper and lower two location hole is substantially parallel, and sample not will shake left and right during the installation process with commutator, good
It ensure that the depth of parallelism of sample and compression clamp well, it is asymmetric to reduce sample left and right deformation during compression creep test
Phenomenon keeps test data accuracy higher, and due to ensure that it is good keep the stability of sample preferable neutrality, solve
The problem of sample easily bends in the case where higher stress is horizontal.
During the test, the drive system of creep testing machine transmits the force to up and down pull rod, makes pull rod point up and down
It does not move up and down, compressive stress state needed for sample is realized by commutator, and commutator is by the tensile stress of creep machine
Be converted to the compression of sample.
After sample fixes, the lower section of bar group of extending under installing on sample, bar of extending connects displacement sensor, in real time
The deformation data of sample is measured, in the sample the fixed thermocouple in portion surface, guarantees the temperature of sample and the creep machine of test setting
In-furnace temperature is almost the same.Specific test parameters is set on the computer of control creep machine, test procedure and each step
Data sampling site frequency.
Detailed creep compliance data, including left deformation can be obtained from the PC display screen of creep testing machine after the test
Amount, right deflection, average deformation amount and relative elongation.Wherein left deflection and right deflection change over time the coincidence of curve
Degree is to judge sample deformation uniformity and the important references whether sample bends, if left and right deforms almost the same, explanation
Sample deformation is not bent uniformly and not more substantially, and creep data accuracy at this time is high, can be used as subsequent section's credit
Analysis.
In order to verify creep compression clamp of the invention in sample to the beneficial effect in terms of neutral and stability, the present invention
Using Zhuhai think carefully Tai Jie Electric Appliance Equipment Co., Ltd production SUST-D5 creep testing machine as testing equipment, creep test machine power
Control error precision is ± 3N, and mating auxiliary oven temperature control precision is ± 2 DEG C.On creep compliance whole measurement system includes:
Extend bar group, under extend outside bar group and furnace displacement sensor composition.The creep compliance of sample then passes through during creep ageing
On extend bar group under extend bar group left and right extend bar pass to the displacement sensor outside furnace read.Wherein displacement sensor
For optical grid line displacement sensor, precision is 5 × 10-4mm。
Uniaxial constant stress compression creep timeliness comparative test is carried out with above-mentioned creep testing machine, test is divided into three groups, three groups
Sample used in testing is the identical 2219 aluminium alloy creep sample of state, and sample two used in three groups of tests
End has external screw thread, in which:
First group with existing compression clamp, (the existing compression clamp and Chinese patent 201910244627.4 of selection are public
The structure opened is identical) the identical compression creep test of experimental condition three times, experimental condition are as follows: test temperature are carried out to sample
165 DEG C, heating rate 5 DEG C/min, aging time 9h, stress intensity 120MPa；
Second group carries out identical compression creep test three times, experimental condition to sample with creep compression clamp of the invention
It is identical as first group of experimental condition；
Third group carries out identical compression creep test twice to sample with creep compression clamp of the invention, except answering
Power size is outside 180MPa, remaining experimental condition is identical as second group.
First group of creep compliance tested three times respectively 0.27% (for details, reference can be made to the curve graphs of Fig. 4) of first time, second
The left and right deflection of secondary 0.215% (for details, reference can be made to the curve graphs of Fig. 5), third time 0.259%, first, second and third test is poor
Different respectively 0.022mm, 0.029mm, 0.018mm (left and right difference about 21%, 32%, 18%), but this left and right deflection difference
It is still larger.It can be seen that test repeatability is poor, and test data accuracy is not when carrying out creep test with existing compression clamp
Height causes very big difficulty to the analysis of test data, just can determine that accurately after needing to carry out multiplicating test
Test result；
Second group of left and right deflection difference tested three times (controls and differs 13%-17%) it in 0.011-0.014mm
Between, the dependent variable tested three times changes over time the graphical representation of the substantially available Fig. 6 of curve；
The left and right deflection difference that third group is tested twice (controls and differs 11%-15%) it in 0.013-0.016mm
Between, the dependent variable tested twice changes over time the graphical representation of the substantially available Fig. 7 of curve.
From above data it is found that with second group with third group test for representative creep compression clamp of the invention with it is existing
Compression clamp is compared and is obviously reduced, and experimental data is repeatable high, and the general identical test twice that carries out is that can determine more standard
True test data.
In addition during three groups of tests, inventors have found that existing compression clamp is in sample installation process due to examination
Sample and commutator are that gap connect, after sample installation still can weak vibrations, and the creep compliance very little of creep ageing test measures
It is very accurate, even the left and right deformation of sample also has a significant impact when slight shaking is to creep ageing, it is therefore desirable to test
Personnel ensure the accuracy of data by the depth of parallelism of range estimation sample and compression clamp as far as possible, but the method is to testing crew
Operation requirement is very high, and test result is uncertain big.Therefore the measured creep data precision come out of existing compression clamp
It is not high enough, it can only obtain out rough data area and experimental rules.
And improved compression clamp component of the invention no longer needs testing crew to rely on during installing sample
Range estimation, installation is easy to operate, and test data accuracy is high, can be as accurate as specific value substantially, avoids the repetition of test
Operation, greatly shortens test period, and expand proof stress range, carries out high-precision data analysis for scientific research personnel
Reliable guarantee is provided with theoretical research.The usage amount of sample greatly reduces simultaneously, is effectively saved the usage amount of material and adds
Expenses of labour is used, and energy-saving and environment-friendly theory is met.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of creep compression clamp, which is characterized in that including holding out against component one (4), holding out against component two (5) and for being connected to
Creep testing machine is vertically connected with the commutator between head, and the commutator includes upper holder block (1) and lower lock block (2), upper holder block with
Draw direction between lower lock block along creep testing machine maintains the spacing for installing sample (3), and the distance values can be adjusted
It is whole, for providing the operation of creep compression-loaded to sample when the spacing becomes smaller, for unloading sample when the spacing becomes larger；
The bottom surface of the upper holder block is provided with the upper location hole (11) of the triangular prism shape protruded into for sample upper end, the top surface of lower lock block
The lower Positioning holes (21) of the triangular prism shape protruded into for sample lower end are provided with, upper location hole and lower Positioning holes are along creep testing machine
Stretch rod axial direction is aligned and the two position, profile and size are all the same, and the inner surface of upper location hole and lower Positioning holes is
Smooth surface and the inscribed cylinder diameter of the two are greater than the diameter of sample end to be protruded into, so that sample smoothly protrudes into；
The position of the corresponding upper location hole of the upper holder block side wall is provided with from the external upper fastener hole (12) for penetrating through supreme location hole,
The axial line of the upper fastener hole intersects with an incline of upper location hole, is provided in upper fastener hole and described holds out against component one
(4), it holds out against axial direction of the component one for along upper fastener hole and pushes against sample upper end outer wall, keep sample upper end and upper location hole another
Two side walls are bonded and are formed tangent positional relationship and are locked, and the intersection of the two side walls is the axis with upper fastener hole
The incline of heart line intersection；
The position that the lower lock block side wall corresponds to lower Positioning holes is provided with the lower fastener hole (22) from external perforation to lower Positioning holes,
The axial line of the lower fastener hole intersects with an incline of lower Positioning holes, is provided in lower fastener hole and described holds out against component two
(5), it holds out against axial direction of the component two for along lower fastener hole and pushes against sample lower end outer wall, make sample lower end and lower Positioning holes
Two side walls are bonded and are formed tangent positional relationship and are locked, and the intersection of the two side walls is the axis with lower fastener hole
The incline of heart line intersection；
The upper fastener hole is located at same parallel with the stretch rod axial direction of creep testing machine with the axial line of lower fastener hole
In plane, pushes against with the end for holding out against component two and positioned respectively with upper and lower so that sample upper and lower ends are held out against component one respectively
When hole is tangent, the sample top and bottom are also located just at same parallel with the stretch rod axial direction of creep testing machine put down
In face, to realize the centering of sample, sample premature bending in creep compression test is prevented.
2. a kind of creep compression clamp according to claim 1, which is characterized in that the axial line of the upper fastener hole with it is upper
One incline of location hole intersects vertically, and the axial line of lower fastener hole and an incline of lower Positioning holes intersect vertically.
3. a kind of creep compression clamp according to claim 1, which is characterized in that the upper fastener hole and lower fastener hole are equal
For tapped threaded hole, described to hold out against component one and hold out against component two be to hold out against with externally threaded bolt or screw
Component one with hold out against component two respectively in upper fastener hole and lower fastener hole towards the direction precession close to sample and respectively to sample
It is fastened.
4. a kind of creep compression clamp according to claim 1, which is characterized in that the upper location hole and lower Positioning holes
Depth is less than or equal to the length of the end of sample to be protruded into, and the depth of the upper location hole and lower Positioning holes is greater than or equal to
The 1/2 of the tip lengths of sample to be protruded into, to guarantee the firmness of clamping, and will not influence sample up and down at lug with dress of extending
The connection set.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910913177.3A CN110501217B (en) | 2019-09-25 | 2019-09-25 | Creep compression clamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910913177.3A CN110501217B (en) | 2019-09-25 | 2019-09-25 | Creep compression clamp |
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| CN110501217A true CN110501217A (en) | 2019-11-26 |
| CN110501217B CN110501217B (en) | 2024-03-08 |
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| CN201910913177.3A Active CN110501217B (en) | 2019-09-25 | 2019-09-25 | Creep compression clamp |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111721625A (en) * | 2020-06-05 | 2020-09-29 | 成都先进金属材料产业技术研究院有限公司 | High-speed tensile sample centering device and method |
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| CN110501217B (en) | 2024-03-08 |
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