CN108548716A - A kind of pole test specimen high temperature push-pull fatigue test cramp and test method - Google Patents
A kind of pole test specimen high temperature push-pull fatigue test cramp and test method Download PDFInfo
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- CN108548716A CN108548716A CN201810282908.4A CN201810282908A CN108548716A CN 108548716 A CN108548716 A CN 108548716A CN 201810282908 A CN201810282908 A CN 201810282908A CN 108548716 A CN108548716 A CN 108548716A
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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
- 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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- 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
-
- 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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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
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- Biochemistry (AREA)
- 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 discloses a kind of pole test specimen high temperature push-pull fatigue test cramp and test methods, realize the stretching/compressing fatigue test to pole test specimen under the high temperature conditions.The optical wand end of fatigue machine hydraulic chuck clamp linkage, and be connected with adapter by screw thread, sleeve is directly inserted in adapter；The thread segment lower half portion of test specimen is connect by screw thread with adapter, and top half is connect by screw thread with pressure-bearing disk, is tightened under certain pulling force；Lag bolt is screwed into pressure-bearing disk circumferential direction threaded hole, lower end and sleeve tip contact, eliminates thread pitch.The present invention meets the stable holding of the pole test specimen of sizes, and realizes its being uniaxially stretched under the high temperature conditions, stretching/compressing fatigue.
Description
Technical field
The present invention relates to uniaxial drawing by high temperature/compressions of Metal Material Fatigue performance testing equipment, especially metal material
The design and manufacture field of fatigue test clamper.
Background technology
Aero-engine turbine disk service condition is severe (high temperature, high pressure, high rotating speed etc.), and turbine disk material subjects alternation
Mechanical load and thermal force.Carry out fatigue test of the turbine disk material under complicated extreme operating condition, to study its fatigue behaviour,
It has a very important significance, achievement in research can support the Structural Strength Design and fatigue of advanced aero engine turbine disk material
Life prediction.
To the design of the stretching/compressing fatigue fixture of pole test specimen, there are following prominent questions：(1) how to eliminate test specimen with
The threaded connection gap of fixture, to carry out stretching/compressing fatigue test.(2) how to ensure the uniform of test specimen temperature at the trial
Property, i.e., test specimen main body and part fixture are needed while being placed in high temperature furnace.(3) how to simplify fixture and specimen Design, ensure folder
The versatility and applicability of tool.Existing patent document has been consulted, has not found that above-mentioned two key problem can be solved
Pole test specimen high-temperature clamp, it is therefore necessary to design a kind of drawing by high temperature/repeated compression test fixture suitable for pole test specimen.
Utility model CN 2767993Y devise a kind of fixture of test high temperature tensile property of thin-walled pipe, for testing
The whole tube section sample high temperature tensile properties of thin-wall pipes (wall thickness is less than 2mm).Due to the structure and standard round bar of whole tube section sample
Test specimen has notable difference, causes the patent that pole test specimen can not be clamped, and test specimen is clamped dependent on frictional force, in higher load
Skidding is easy to happen under the conditions of lotus.In addition, the clamping scheme of the patent can not meet the needs for applying compressive load.
Patent of invention CN 200810167020.2 devises a kind of metal thin wall pipe sample axial push-pull fatigue test folder
Tool, the wedge-shaped fixture block that male and fomale(M＆F) is respectively provided with by a pair compresses thin-wall tube test specimen, for testing tube wall tensile and compressive property.The fixture
Design scheme cannot be used for the clamping of standard round bar test specimen, and fixture needs higher processing cost.
It is tired that 104101532 A of patent of invention CN devise a kind of metal thin wall pipe sample high-temperature high pressure water axial push-pull
Labor test fixture.The patent is not suitable for the clamping of standard round bar test specimen equally yet.
Utility model CN200920079962.5 devises a kind of high temperature fatigue test clamp for metal thin wall equal-wall thickness tube.
The patent cannot be satisfied the clamping of standard round bar test specimen, and cannot provide compressive load.
201867334 U of utility model CN devise a kind of Multi-functional extension clamp for material fatigue test.The patent can not
Meet the clamping of standard round bar test specimen, and compressive load cannot be provided.
Utility model CN201420569830.1 devises a kind of axial fatigue performance test fixture.The patent considers
Influence of the gap of test specimen thread segment to fatigue test process, but the screw thread exchanging structure from test specimen to fatigue machine is more, it should
Partial gap does not consider to eliminate, therefore can not carry out stretching/compressing fatigue test.
To sum up, the prior art cannot meet pole test specimen in a high temperauture environment stretching/compressing fatigue test the needs of.
Invention content
Present invention solves the technical problem that being：Overcome the deficiencies of the prior art and provide a kind of high temperature tension and compression of pole test specimen
Fatigue test clamper and test method meet the stretching/compressing fatigue test demand under hollow pole test specimen hot conditions, and press from both sides
Tool can be equally placed under hot environment, ensure the uniformity and stability of test specimen temperature；Clamp structure is relatively easy simultaneously, can
With the fatigue tester suitable for Multiple Type and type.
Technical solution of the invention is：A kind of high temperature push-pull fatigue test cramp of hollow pole test specimen, including：Even
Bar (1), adapter (2), sleeve (3), pressure-bearing disk (4) and lag bolt (5)；One end of connecting rod (1) can be optical wand, be suitable for
Hydraulic fatigue machine grip holder clamps, or is boss with threaded hole, is suitable for electronic universal tester；Adapter (2) passes through screw thread
It is connect with connecting rod (1)；Sleeve (3) is contacted across adapter (2) with connecting rod (1), highly consistent with adapter top half, outer diameter
No more than connecting rod diameter；The lower half portion of pole test specimen (6) one end is threaded into adapter (2), the other half precession pressure-bearing circle
The centre bore of disk (4)；Four lag bolts (5) are screwed into four circumferentially uniformly distributed threaded holes of pressure-bearing disk (4), lag bolt
(5) contact at the top of end and sleeve (3), pressure-bearing disk (4) is jacked up, make pole test specimen (6) one end top half screw thread and
There are certain pulling force between the screw thread of lower half portion, thread pitch is eliminated.
Stretched portion in stretching/compressing fatigue test, pulling force passes to connecting rod (1) by tired machine grip holder, and leads to
It crosses threaded connection and pulling force is transmitted to adapter (2)；Adapter (2) is threadedly coupled biography with the lower half portion of pole test specimen (6) one end
Pulling force is passed, to realize the application of tensile load in stretching/compressing fatigue test.
Compression section in stretching/compressing fatigue test, pressure pass to connecting rod (1) by tired machine grip holder, go forward side by side
By the contact between connecting rod (1) and sleeve (3), pressure is transmitted to sleeve (3)；It is held with 4 lag bolts (5) at the top of sleeve (3)
Portion contacts, to which pressure is transmitted to pressure-bearing disk (4)；Pressure-bearing disk (4) and the top half screw thread of pole test specimen (6) one end connect
Transmission pressure is connect, to realize the application of compressive load in stretching/compressing fatigue test.
Before being tightened due to four circumferentially uniformly distributed lag bolts (5) of pressure-bearing disk (4), stretched in advance using fatigue machine,
Fixture is set to bear certain pulling force, which is no more than the elastic range of pole test specimen (6) material, then tightens four short spiral shells again
Bolt (5), leads between the top half screw thread and lower half portion screw thread of pole test specimen (6) one end that there are certain pulling force, therefore
When the load that pole test specimen (6) is born changes from tensile load to compressive load, when tensile load is less than certain value, pole test specimen
(6) the lower half portion screw thread of one end will be solely subjected to sub-fraction pressure, the upper half that most pressure are connected by pressure-bearing disk (4)
Partial threads are born.It can ensure when load zero crossing to be not in thread pitch in this way, it can be with smooth transition.
The advantages of present invention is compared with existing fatigue test clamper scheme is：
(1) present invention can be used for stretching/compressing fatigue examination of pole test specimen within the temperature range of room temperature to 800 DEG C of high temperature
It tests；
(2) pole jig main body part of the invention can be placed directly in high temperature furnace, ensure that pole test specimen is heated evenly
Stablize；
(3) form of the present invention is simple, easy to process, is applicable to a plurality of types of fatigue testers.
Description of the drawings
Fig. 1 is structural schematic diagram of the present clip when pole test specimen is clamped；
Fig. 2 is the connecting rod schematic diagram of present clip, wherein (a) is outside drawing；(b) it is left view；(c) it is vertical view；
(d) it is right view；
Fig. 3 is the adapter schematic diagram of present clip, wherein (a) is outside drawing；(b) it is left view；(c) it is to overlook
Figure；(d) it is right view；
Fig. 4 is the sleeve schematic diagram of present clip, wherein (a) is outside drawing；(b) it is left view；(c) it is vertical view；
(d) it is right view；
Fig. 5 is the pressure-bearing disk schematic diagram of present clip, wherein (a) is outside drawing；(b) it is left view；(c) it is to overlook
Figure；(d) it is right view；
Fig. 6 is the lag bolt schematic diagram of present clip, wherein (a) is outside drawing；(b) it is left view；(c) it is to overlook
Figure；(d) it is right view；
Fig. 7 is structure of the invention sectional view.
Specific implementation mode
Present invention is generally directed to the high temperature drawingand pressing fatigue fixtures suitable for pole test specimen to be designed.Actually test
When, a whole set of fixture includes two present clips, is divided into upper fixture and lower fixture, the total figure completely installed is shown in Fig. 7.
As shown in Fig. 1,2,3,4,5,6,7, assemble upper and lower fixture respectively first, including connecting rod 1, adapter 2, sleeve 3,
Pressure-bearing disk 4 and lag bolt 5.
The assembling of upper fixture is fixed using fatigue machine hydraulic chuck or bolt and one end of connecting rod 1 is fixed on fatigue machine,
Then adapter 2 and connecting rod 1 are connected through a screw thread；It is connected through a screw thread and pressure-bearing disk 4 is screwed onto 6 one end of pole test specimen approaches
It examines at the top half screw thread of section, sleeve 3 is then inserted in adapter, and by the combination section of pressure-bearing disk 4 and pole test specimen 6
Part is connect by screw thread with adapter, need not tighten pressure-bearing disk 4 at this time.The assembling of upper fixture is completed at this time.
Under installation when fixture, it is necessary first to be threadedly coupled connecting rod 1 with adapter 2, then be inserted in sleeve 3；At this time will
Pressure-bearing disk 4 is screwed onto 6 other end of pole test specimen close at the top half screw thread of examination section, then by connecting rod 1,2 and of adapter
The combiner of sleeve 3 is threadedly coupled by the screw thread of adapter with lower half portion of 6 other end of pole test specimen far from examination section,
Then lag bolt 5 is screwed into respectively in the circumferential threaded hole of two pressure-bearing disks 4, is not necessarily to tighten at this time, complete the group of lower fixture
Dress.After the assembling for completing upper and lower fixture, the connector of connecting rod 1 in lower fixture is fixed on by hydraulic chuck or be bolted tired
On labor machine, the installation of fixture is completed.
It after completing fixture installation, is stretched using fatigue machine, fixture is made to bear certain pulling force, which is no more than circle
The elastic range of 6 material of stick test specimen, the threaded connection stress of pole test specimen 6 and adapter 2, then screws two pressure-bearing circles at this time
Then disk 4 is tightened the circumferential short thread 5 on two pressure-bearing disks 4, is made until disk lower end and 2 upper-end contact of adapter compression
There are opposite pulling force between the top half and lower half portion of 6 both ends thread segment of pole test specimen, that is, eliminate thread pitch.
When stretching/compressing fatigue test carries out, when the load born in pole test specimen 6 changes from tensile load to compressive load, when
When tensile load is less than the pulling force being previously applied, the lower half portion screw thread at 6 both ends of pole test specimen will be solely subjected to sub-fraction pressure,
The top half screw thread that most pressure are connected by pressure-bearing disk 4 is born.When can ensureing load zero crossing so not
It will appear thread pitch, it can be with smooth transition.
Finally, high temperature furnace is closed, including the combiner including pole test specimen 6 and a part of fixture will be heated, until
Installation is complete for this whole set of fixture.
Test method is as follows：
Step 1：Complete the assembling of fixture up and down and on fatigue machine；
Step 2：It is stretched using fatigue machine, fixture is made to bear certain pulling force, which is no more than 6 material of pole test specimen
The elastic range of material, at this time the threaded connection stress of pole test specimen 6 and adapter 2；
Step 3：Two pressure-bearing disks 4 are screwed until disk lower end and 2 upper-end contact of adapter compression, then tighten two
Circumferential short thread 5 on pressure-bearing disk 4, makes between the top half and lower half portion of 6 both ends thread segment of pole test specimen that there are phases
Anti- pulling force, that is, eliminate thread pitch；
Step 4：High temperature furnace is closed, including the combiner including pole test specimen 6 and a part of fixture will be heated, directly
To reaching set temperature and keeping the temperature 1 hour, the temperature of pole test specimen is in uniform state at this time；
Step 5：Operation fatigue machine is arranged experimental condition and starts stretching/compressing fatigue test.Due to pressure-bearing disk 4 weeks
Before being tightened to four uniformly distributed lag bolts 5, is stretched in advance using fatigue machine, so that fixture is born certain pulling force, the pulling force is not
More than the elastic range of 6 material of pole test specimen, four lag bolts 5 are then tightened again, lead to the top half of 6 one end of pole test specimen
The pulling force that there is the elastic range no more than pole material for test between screw thread and lower half portion screw thread, in stretching/compressing fatigue
During experiment, when tensile load is more than the pulling force of the previously given elastic range no more than pole material for test, four
Lag bolt 5 is detached with 3 top of sleeve, and the lower half portion screw thread of only 6 one end of pole test specimen bears tensile load at this time, in pole
When the load that test specimen 6 is born changes from tensile load to compressive load, when tensile load is no more than pole less than previously given
When the pulling force of the elastic range of material for test, four lag bolts 5 are contacted with 3 top of sleeve, the lower half portion of 6 one end of pole test specimen
Screw thread will be not subject to compressive load, and the top half screw thread that all compressive loads are connected by pressure-bearing disk 4 is born, and passes through four
Compressive load is transferred to sleeve 3 by lag bolt 5, then is transferred to connecting rod 1 by sleeve 3.It will not when ensure that load zero crossing
There is thread pitch, it can be with smooth transition.
Stretched portion in stretching/compressing fatigue test, pulling force passes to connecting rod 1 by tired machine grip holder, and passes through
It is threadedly coupled and pulling force is transmitted to adapter 2；Adapter 2 is threadedly coupled with the lower half portion of 6 one end of pole test specimen transmits pulling force, from
And realize the application of tensile load in stretching/compressing fatigue test.
Compression section in stretching/compressing fatigue test, pressure pass to connecting rod 1 by tired machine grip holder, go forward side by side logical
The contact between connecting rod 1 and sleeve 3 is crossed, pressure is transmitted to sleeve 3；3 top of sleeve is contacted with four 5 ends of lag bolt, to
Pressure is transmitted to pressure-bearing disk 4；Pressure-bearing disk 4 is threadedly coupled with the top half of 6 one end of pole test specimen transmits pressure, to real
The application of compressive load in stretching/compressing fatigue test is showed.
Include the combiner including pole test specimen 6 and a part of fixture using high temperature stove heat, examination section temperature is made to protect
It holds at 650 DEG C, carries out high temperature alloy fatigue test, frequency f=0.2Hz, stress ratio R=-1, maximum tension carries during experiment
Lotus is more than 1000MPa, and maximum compression load is more than 1000MPa, adds up to carry out more than 105The fatigue test of secondary cycle, clamp-like
Condition is good, illustrates that present clip disclosure satisfy that the demand of pole test specimen drawing by high temperature/repeated compression test.
From above-mentioned specific implementation process it can be found that present clip can to meet pole test specimen drawing by high temperature/compression tired
The demand of labor experiment.Of course, present clip can be used for the experiment of the stretching/compressing under room temperature.Due to the examination section of testpieces
Surrounding can easily install extensometer without the interference of other fixture parts, carry out the pole test specimen under strain controlling
Drawing by high temperature/repeated compression test.Additionally, when needing to carry out various sizes of pole test specimen stretching/compressing fatigue test,
It only needs to replace corresponding adapter, nothing needs to change a whole set of fixture.
Claims (7)
1. a kind of pole test specimen high temperature push-pull fatigue test cramp, which is characterized in that including：Connecting rod (1), adapter (2), sleeve
(3), pressure-bearing disk (4) and lag bolt (5) and pole test specimen (6)；Adapter (2) is connect by screw thread with connecting rod (1)；Sleeve
(3) it is contacted with connecting rod (1) across adapter (2)；The lower half portion of pole test specimen (6) one end is threaded into adapter (2), separately
The centre bore of half precession pressure-bearing disk (4)；Lag bolt (5) is screwed into pressure-bearing disk (4), lag bolt (5) end with
Contact at the top of sleeve (3), pressure-bearing disk (4) are jacked up.
2. pole test specimen high temperature push-pull fatigue test cramp according to claim 1, it is characterised in that：The pressure-bearing disk
(4) it is contacted at the top of lag bolt (5) end in four circumferentially uniformly distributed threaded holes and sleeve (3), makes pole test specimen (6) end of thread
Top half screw thread and lower half portion screw thread between there are pulling force, eliminate pole test specimen (6) and switching during stretching/compressing
Thread pitch between head (2), pressure-bearing disk (4) and pole test specimen (6).
3. pole test specimen high temperature push-pull fatigue test cramp according to claim 1, it is characterised in that：The pressure-bearing disk
(4) it is tightened under conditions of the pulling force of the elastic range no more than pole material for test, ensures that load is down to after given pulling force,
Load is undertaken by pressure-bearing disk (4) and its four lag bolts (5).
4. pole test specimen high temperature push-pull fatigue test cramp according to claim 1, it is characterised in that：The sleeve (3)
Outer diameter is equal with the outer diameter of pressure-bearing disk (4) and connecting rod (1), bears the compressive load passed over from pole test specimen (6).
5. pole test specimen high temperature push-pull fatigue test cramp according to claim 1, it is characterised in that：The connecting rod (1)
One end be optical wand, be suitable for Hydraulic fatigue machine grip holder clamp；Or be boss with threaded hole, it is suitable for the electronics with high temperature furnace
Universal testing machine.
6. a kind of pole test specimen high temperature repeated tension and compression test method, which is characterized in that include the following steps：
Step 1：Complete the assembling of high temperature push-pull fatigue test cramp and on fatigue machine；
Step 2：It is stretched using fatigue machine, fixture is made to bear certain pulling force, which is no more than pole test specimen (6) material
Elastic range, the threaded connection stress of pole test specimen (6) and adapter (2) at this time；
Step 3：Two pressure-bearing disks (4) are screwed until disk lower end and adapter (2) upper-end contact compression, then tighten two
Circumferential short thread (5) on a pressure-bearing disk (4) makes the top half of pole test specimen (6) both ends thread segment and lower half divide it
Between there are opposite pulling force, that is, eliminate thread pitch；
Step 4：Heating includes the combiner including pole test specimen (6) and a part of fixture being connect with pole test specimen (6),
Until reaching set temperature and keeping the temperature, the temperature of pole test specimen is in uniform state at this time；
Step 5：Operation fatigue machine is arranged experimental condition and starts stretching/compressing fatigue test, since pressure-bearing disk (4) is circumferential
Before four uniformly distributed lag bolts (5) are tightened, is stretched in advance using fatigue machine, so that fixture is born certain pulling force, the pulling force is not
More than the elastic range of pole test specimen (6) material, four lag bolts (5) are then tightened again, lead to the upper of pole test specimen (6) one end
There are certain pulling force between half part screw thread and lower half portion screw thread, therefore the load born in pole test specimen (6) is carried by stretching
When lotus changes to compressive load, when tensile load is less than certain value, the lower half portion screw thread of pole test specimen (6) one end will be solely subjected to
Partial pressure, the top half screw thread that most pressure are connected by pressure-bearing disk (4) are born, when ensureing load zero crossing
Be not in thread pitch, smooth transition.
7. a kind of pole test specimen high temperature repeated tension and compression test method according to claim 6, it is characterised in that：The step
In four, 1 hour is kept the temperature.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810282908.4A CN108548716B (en) | 2018-04-02 | 2018-04-02 | A kind of pole test specimen high temperature push-pull fatigue test cramp and test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810282908.4A CN108548716B (en) | 2018-04-02 | 2018-04-02 | A kind of pole test specimen high temperature push-pull fatigue test cramp and test method |
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| Publication Number | Publication Date |
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| CN108548716A true CN108548716A (en) | 2018-09-18 |
| CN108548716B CN108548716B (en) | 2019-07-30 |
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| CN109374451A (en) * | 2018-11-29 | 2019-02-22 | 西北工业大学 | Fatigue experimental device based on optical fiber sensing technology |
| CN109470468A (en) * | 2018-12-29 | 2019-03-15 | 北京航空航天大学 | A kind of height week composite fatigue test fixture of turbine mortise structure |
| CN109632471A (en) * | 2018-12-22 | 2019-04-16 | 中国计量科学研究院 | A kind of novel pulling force experiment machine fixture |
| CN109870375A (en) * | 2019-03-14 | 2019-06-11 | 华东理工大学 | A kind of low temperature high frequency fatigue test system |
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