CN108548716B - 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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- CN108548716B CN108548716B CN201810282908.4A CN201810282908A CN108548716B CN 108548716 B CN108548716 B CN 108548716B CN 201810282908 A CN201810282908 A CN 201810282908A CN 108548716 B CN108548716 B CN 108548716B
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- test specimen
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- pole test
- high temperature
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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
-
- 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
-
- 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
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 by screw thread with adapter, 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 technique
Aero-engine turbine disk service condition is severe (high temperature, high pressure, high revolving 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, research achievement 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 guarantee the uniform of test specimen temperature when testing
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, guarantee folder
The versatility and applicability of tool.Existing patent document is consulted, discovery can not be able to solve above-mentioned two key problem
Pole test specimen high-temperature clamp, it is therefore necessary to design a kind of drawing by high temperature suitable for pole test specimen/repeated compression test fixture.
Utility model CN 2767993Y devises a kind of fixture for testing 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 can not clamp pole test specimen, 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 compresses thin-wall tube test specimen by the wedge-shaped fixture block that a pair is respectively provided with male and fomale(M&F), 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 devises 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 is unable to satisfy the clamping of standard round bar test specimen, and cannot provide compressive load.
201867334 U of utility model CN devises 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 is not able to satisfy the demand of pole test specimen stretching/compressing fatigue test in a high temperauture environment.
Summary of the invention
Technical problem solved by the present invention is overcoming 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, guarantee the uniformity and stability of test specimen temperature；Clamp structure is relatively easy simultaneously, can
To be suitable for the fatigue tester of Multiple Type and type.
The technical solution of the invention is as follows: a kind of high temperature push-pull fatigue test cramp of hollow pole test specimen, comprising: 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) passes through adapter (2) and contacts 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 at the top of sleeve (3) with 4 lag bolts (5)
Portion's contact, so that 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
Transmitting 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 lower 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 guarantee 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 is 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, guarantee 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.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the present clip when clamping pole test specimen；
Fig. 2 is the connecting rod schematic diagram of present clip, wherein (a) is outside drawing；It (b) is left view；It (c) is top view；
It (d) is right view；
Fig. 3 is the adapter schematic diagram of present clip, wherein (a) is outside drawing；It (b) is left view；It (c) is vertical view
Figure；It (d) is right view；
Fig. 4 is the sleeve schematic diagram of present clip, wherein (a) is outside drawing；It (b) is left view；It (c) is top view；
It (d) is right view；
Fig. 5 is the pressure-bearing disk schematic diagram of present clip, wherein (a) is outside drawing；It (b) is left view；It (c) is vertical view
Figure；It (d) is right view；
Fig. 6 is the lag bolt schematic diagram of present clip, wherein (a) is outside drawing；It (b) is left view；It (c) is vertical view
Figure；It (d) is right view；
Fig. 7 is structure of the invention cross-sectional view.
Specific embodiment
Present invention is generally directed to be suitable for the high temperature drawingand pressing fatigue fixture of 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.
One end of connecting rod 1 is fixed on fatigue machine by the assembling of upper fixture using fatigue machine hydraulic chuck or bolt are fixed,
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, does not need to tighten pressure-bearing disk 4 at this time.The assembling of upper fixture is completed at this time.
When lower fixture is installed, 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 with 6 other end of pole test specimen far from the lower half portion of examination section by the screw thread of adapter,
Then lag bolt 5 is screwed into the circumferential threaded hole of two pressure-bearing disks 4 respectively, at this time without tightening, completes 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 lower 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,
Most pressure are born by the top half screw thread that pressure-bearing disk 4 connects.When can guaranteeing load zero crossing so not
It will appear thread pitch, it can be with smooth transition.
Finally, high temperature furnace is closed, will be heated comprising the combiner including pole test specimen 6 and a part of fixture, until
This whole set of fixture is installed.
Test method is as follows:
Step 1: completing the assembling of fixture up and down and be mounted on fatigue machine；
Step 2: being 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: screwing two pressure-bearing disks 4 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 being closed, will be heated comprising the combiner including pole test specimen 6 and a part of fixture, 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
It 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
There is the pulling force of the elastic range no more than pole material for test between screw thread and lower half portion screw thread, in stretching/compressing fatigue
During test, when tensile load is more than the pulling force of the previously given elastic range no more than pole material for test, four
It is separated at the top of lag bolt 5 and sleeve 3, only the lower half portion screw thread of 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 lower than previously given
When the pulling force of the elastic range of material for test, contacted at the top of four lag bolts 5 and sleeve 3, the lower half portion of 6 one end of pole test specimen
Screw thread will be not subject to compressive load, and all compressive loads are born by the top half screw thread that pressure-bearing disk 4 connects, and pass 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 transmitting pulling force with the lower half portion of 6 one end of pole test specimen, 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, thus
Pressure is transmitted to pressure-bearing disk 4；Pressure-bearing disk 4 is threadedly coupled transmitting pressure with the top half of 6 one end of pole test specimen, thus 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 heating, makes that section temperature is examined 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 test
Lotus is greater than 1000MPa, and maximum compression load is greater than 1000MPa, adds up to carry out more than 105The fatigue test of secondary circulation, clamp-like
Condition is good, illustrates that present clip can satisfy pole test specimen drawing by high temperature/repeated compression test demand.
From above-mentioned specific implementation process it can be found that present clip to can satisfy pole test specimen drawing by high temperature/compression tired
The demand of labor test.Of course, present clip can be used for the test 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 components, 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, no replacement is required a whole set of fixture.
Claims (6)
1. a kind of pole test specimen high temperature push-pull fatigue test cramp characterized by comprising 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) adapter (2) are passed through to contact with connecting rod (1)；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；
It contacts, makes at the top of lag bolt (5) end and sleeve (3) in four circumferentially uniformly distributed threaded holes of the pressure-bearing disk (4)
There are pulling force between the top half screw thread and lower half portion screw thread of pole test specimen (6) end of thread, during eliminating stretching/compressing
Thread pitch between pole test specimen (6) and adapter (2), pressure-bearing disk (4) and pole test specimen (6).
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 tightened under conditions of being no more than the pulling force of elastic range of pole material for test, guarantees that load is down to after given pulling force,
Load is undertaken by pressure-bearing disk (4) and its four lag bolts (5).
3. 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).
4. 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, suitable for the electronics with high temperature furnace
Universal testing machine.
5. a kind of pole test specimen high temperature repeated tension and compression test method, it is characterised in that: use pole test specimen described in claim 1
High temperature push-pull fatigue test cramp, comprising the following steps:
Step 1: it completes the assembling of high temperature push-pull fatigue test cramp and is mounted on fatigue machine；
Step 2: being stretched using fatigue machine, and 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: screwing two pressure-bearing disks (4) 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 connecting 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
It 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 lower than certain value, the lower half portion screw thread of pole test specimen (6) one end will be solely subjected to
Partial pressure, most pressure are born by the top half screw thread that pressure-bearing disk (4) connects, when guaranteeing load zero crossing
It is not in thread pitch, smooth transition.
6. a kind of pole test specimen high temperature repeated tension and compression test method according to claim 5, 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 CN108548716A (en) | 2018-09-18 |
| CN108548716B true CN108548716B (en) | 2019-07-30 |
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| CN109991072B (en) * | 2018-11-28 | 2022-04-12 | 南京航空航天大学 | High-temperature tensile test chuck and testing machine |
| CN109374451A (en) * | 2018-11-29 | 2019-02-22 | 西北工业大学 | Fatigue experimental device based on optical fiber sensing technology |
| 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 |
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| CN109870375B (en) * | 2019-03-14 | 2022-06-24 | 华东理工大学 | Low-temperature high-frequency fatigue test system |
| CN110987651A (en) * | 2019-12-30 | 2020-04-10 | 沈阳航空航天大学 | Nut pressing type low-temperature fatigue device |
| CN111595695A (en) * | 2020-06-04 | 2020-08-28 | 上海交通大学 | Clearance elimination device and method suitable for low-temperature tension-compression fatigue test |
| US11879794B2 (en) * | 2021-01-21 | 2024-01-23 | Illinois Tool Works Inc. | Compression apparatus for automating specimen testing |
| WO2022159673A1 (en) * | 2021-01-21 | 2022-07-28 | Illinois Tool Works Inc. | System, method, and apparatus for automating specimen testing |
| CN113390712B (en) * | 2021-06-02 | 2022-04-05 | 北京航空航天大学 | Impact tensile fatigue test fixture for round bar test piece |
| CN113640106B (en) * | 2021-08-12 | 2022-09-16 | 上海交通大学 | Axial tension-compression high-temperature fatigue test fixture and test method |
| CN115389312B (en) * | 2022-09-15 | 2023-06-27 | 上海航空材料结构检测股份有限公司 | Plate-shaped sample ultra-high temperature low cycle fatigue test clamp, clamping device and test device |
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| CN108548716A (en) | 2018-09-18 |
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