CN104792612B - A kind of high temperature push-pull fatigue test cramp of hollow pole test specimen - Google Patents
A kind of high temperature push-pull fatigue test cramp of hollow pole test specimen Download PDFInfo
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- CN104792612B CN104792612B CN201510232959.2A CN201510232959A CN104792612B CN 104792612 B CN104792612 B CN 104792612B CN 201510232959 A CN201510232959 A CN 201510232959A CN 104792612 B CN104792612 B CN 104792612B
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- test specimen
- hollow pole
- connecting rod
- hollow
- sleeve
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Abstract
The invention discloses the high temperature push-pull fatigue test cramp of a kind of hollow pole test specimen, it is achieved to hollow pole test specimen when hot test internal gas flow cooling, and then can when hot test inside and outside hollow pole test specimen wall form required thermograde；The optical wand end that fatigue machine hydraulic chuck is clamped, and be connected with connecting rod by dormant bolt；Connecting rod and sleeve pass through nut screwing clamping；Test specimen is screwed in test specimen lid, and is together screwed in sleeve, and is withstood by the hollow rod end of connecting rod, eliminates thread pitch；The cooling air-flow come from compressor passes from cooler joint, by bigger hole through sleeve, enters the inner chamber of connecting rod, and and then enter inside hollow circular-tube test specimen, be downwardly into test specimen, and pass through lower clamp and discharge.The present invention meets the stable holding of the hollow pole test specimen of sizes, and it is tired to realize its uniaxial tension under the high temperature conditions, stretching/compressing.
Description
Technical field
The present invention relates to the single shaft drawing by high temperature/compression fatigue of Metal Material Fatigue performance testing equipment, especially metal material
Test fixture manufacture and design field.
Background technology
Aero engine turbine blades service condition is severe (high temperature, high pressure, high rotating speed, exhaust gas corrosion etc.), blade material
Material subjects mechanical load and the thermal force of alternation.Carry out blade material fatigue test under complicated extreme operating condition, to grind
Studying carefully its fatigue behaviour, tool is of great significance.High-pressure turbine blade is mostly hollow air-cooled blade, in blade at present
There is the highest temperature difference in outer wall, causes blade to there is significant thermograde in wall thickness direction.There are some researches show, temperature
The existence of degree gradient changes the micromechanism of damage of the microstructure of blade material, makes blade surface form fold in advance, produces
Stress is concentrated, and makes blade fatigue damage aggravation.The most extremely it is necessary to study blade material high temperature under thermograde tired
Labor performance, achievement in research can support Structural Strength Design and the fatigue life prediction of advanced aero engine turbo blade.
Standard hollow pole test specimen by standard recommendations such as U.S. ASTM E2368-10, ISO 12111:2011 as high temperature
Fatigue test test specimen.While test specimen entirety heats, inside test specimen, logical cooling gas simulates true hollow air-cooled turbine
The inner air cooling of blade, can form preferable thermograde in test specimen wall thickness direction effectively.Now test specimen is carried out
Stretching/compressing fatigue test, then can obtain blade material fatigue behaviour under thermograde.But to hollow pole test specimen
There are two significant problems in the design of stretching/compressing fatigue fixture: how (1) eliminates threadeding of test specimen and fixture
Gap, to carry out stretching/compressing fatigue test；(2) how cooling air flow passage is designed, to cool down inside test specimen, shape
Become thermograde.Consult existing patent documentation, do not find to can solve the problem that the open circles of above-mentioned two key problem
Rod test specimen high-temperature clamp, it is therefore necessary to design a kind of drawing by high temperature/repeated compression test folder being applicable to hollow pole test specimen
Tool.
Utility model CN 2767993Y devises a kind of fixture testing high temperature tensile property of thin-walled pipe, is used for testing thin
The whole tube section sample high temperature tensile properties of wall tube material (wall thickness is less than 2mm).Structure and standard null due to whole tube section sample
Heart pole test specimen has notable difference, causes this patent cannot clamp hollow pole test specimen.Additionally, the clamping side of this patent
Case can not meet the needs applying compressive load.
Patent of invention CN 101358915A devises a kind of axial push-pull fatigue test cramp,
Compress light-wall pipe test specimen by being respectively provided with the wedge shape fixture block of male and fomale(M&F) for a pair, be used for testing tube wall tensile and compressive property.This fixture
Design cannot be used for the clamping of standard hollow pole test specimen, also cannot complete the structure of test specimen wall thickness direction thermograde
Build.
It is tired that patent of invention CN 104101532A devises a kind of metal thin wall pipe sample high-temperature high pressure water axial push-pull
Test fixture.This patent is not suitable for the clamping of standard hollow pole test specimen the most yet, and cannot complete test specimen wall thickness direction
The structure of thermograde.
Utility model CN 201382879Y devises a kind of metal thin-wall uniform thickness tubing high temperature fatigue test clamp.This is special
Profit cannot meet the clamping of standard hollow pole test specimen, and is not provided that compressive load, it is impossible to provides cooling inside test specimen
Air-flow.
Utility model CN 201867334 U devises a kind of multifunctional material fatigue test amplification fixture.This patent cannot
Meet the clamping of standard hollow pole test specimen, and be not provided that compressive load, it is impossible to cooling air-flow is provided inside test specimen.
Utility model CN 204101375 U devises a kind of axial fatigue performance test fixture.This patent is for solid
Pole specimen Design, fixture can not provide cooling air-flow inside test specimen, form thermograde.
To sum up, prior art cannot be used for the clamping of standard hollow pole test specimen, also cannot complete test specimen wall thickness direction temperature
The structure of gradient；It is not provided that compressive load, it is impossible to inside test specimen, provide cooling air-flow simultaneously.
Summary of the invention
Present invention solves the technical problem that and be: overcome the deficiencies in the prior art, it is provided that the high temperature of a kind of hollow pole test specimen draws
Pressure fatigue test clamper, meets hollow pole test specimen stretching/compressing fatigue test demand under thermograde, and can be steady
Clamp holds hollow pole test specimen, can carry out cooling down the fatigue test of air duct simultaneously.
The technical solution of the present invention is: the high temperature push-pull fatigue test cramp of a kind of hollow pole test specimen, including: connect
Head (1), connecting rod (2), sleeve (4), test specimen lid (5), hollow pole test specimen (6) and cooler joint (8)；
The optical wand end of joint (1) is clamped by fatigue machine hydraulic chuck；Joint (1) is by dormant bolt (7) and connecting rod (2)
It is connected；Connecting rod (2) is tightened by nut (3) with sleeve (4)；Hollow pole test specimen (6) is screwed into test specimen lid (5)
In, as being threaded in sleeve (4) entirely through test specimen lid (5), and by the hollow rod end top of connecting rod (2)
Live, eliminate thread pitch；Cooler joint (8) passes sleeve (4), and cold air is passed through the inner chamber of connecting rod (2),
And then enter inside hollow pole test specimen, downwards and discharge, it is achieved and the internal cooling of test specimen, to realize in test specimen wall thickness side
To thermograde.
Stretched portion in stretching/compressing fatigue test, pulling force passes to joint (1) by fatigue machine chuck, and leads to
Cross six dormant bolts (7) and pulling force is passed to connecting rod (2)；Connecting rod (2) and sleeve (4) are by nut (3) spiral shell
Stricture of vagina connects, thus gives sleeve (4) by pulling force transmission；Sleeve (4) is threaded connection and pulling force passes to test specimen lid
(5)；Test specimen lid (5) threadeds transmission pulling force with hollow pole test specimen (6), it is achieved thereby that stretching/compressing is tired
The applying of tensile load in labor test.
Compression section in stretching/compressing fatigue test, pressure passes to joint (1) by fatigue machine chuck, goes forward side by side
By contacting between joint (1) with connecting rod (2), pressure is passed to connecting rod (2)；Connecting rod (2) hollow rod end with
Hollow pole test specimen (6) ends contact, thus pressure is passed to hollow pole test specimen (6), it is achieved thereby that stretching/
The applying of compressive load in repeated compression test.
Described sleeve (4) has an elongated hole, and its size can allow cooling joint (8) unhinderedly through sleeve (4),
And be threadedly coupled on the hollow stem of connecting rod (2)；And the hollow stem of connecting rod (2) contacts with hollow pole test specimen (6),
Thus air-flow enters connecting rod (2) from cooling joint (8), and flow into hollow pole test specimen by hollow stem, it is achieved hollow
The internal gas flow cooling of pole test specimen.
Present invention advantage compared with existing fatigue test clamper scheme is:
(1) to can be used for hollow pole test specimen stretching/compressing within the temperature range of room temperature to high temperature 1000 DEG C tired for the present invention
Labor is tested；
(2) present invention can be that open circles rod test specimen provides cooling air, thus is formed required in test specimen wall thickness direction
Thermograde；
(3) form of the present invention is simple, easy to process, during logical pressure-air cooling test specimen, can effectively reduce folder simultaneously
Tool temperature, heat unnecessary when reducing hot test passes to fatigue machine.
Accompanying drawing explanation
Fig. 1 is the present clip structural representation when clamping hollow pole sample；
Fig. 2 is the joint figure of present clip, and wherein (a) is outside drawing；B () is left view；C () is top view；(d) be
Right view；
Fig. 3 is the connecting rod schematic diagram of present clip；
Fig. 4 is the sleeve schematic diagram of present clip, and wherein (a) is outside drawing；(b) top view；(c) right view；
Fig. 5 is the nut schematic diagram of present clip, wherein (a) outside drawing；(b) left view；(c) top view；D () right side regards
Figure；
Fig. 6 is the test specimen lid schematic diagram of present clip, wherein (a) outside drawing；(b) outside drawing；(c) left view；D () is bowed
View；E () right side regards；
Fig. 7 is the cooler joint schematic diagram of present clip, wherein (a) outside drawing；(b) left view；(c) top view；
Fig. 8 is the hollow pole test specimen schematic diagram of clamping, (a) outside drawing in the present invention；(b) top view；(c) sectional view；
Fig. 9 is that in the present invention, fixture is assembled on fatigue machine the total figure carrying out testing；
Figure 10 is present configuration sectional view.
Detailed description of the invention
The fatigue at high temperature fixture that present invention is generally directed to be applicable to the band cooling duct of hollow pole test specimen is designed.Real
On border during test, a whole set of fixture includes two present clip, is divided into fixture and lower clamp, and the complete total figure installed is shown in
Fig. 9.Assemble upper and lower fixture the most respectively:
As shown in Fig. 1,2,3,4,5,6,7,10, first assemble fixture.The butt end of joint 1 with connecting rod 2 is led to
Cross six dormant bolts 7 connections to tighten, then sleeve 4 is inserted in hollow stem one end of connecting rod 2, it is desirable to lacking of sleeve 4
Mouth just tooth fit little be positioned at connecting rod 2 hollow stem root two, had the most both been possible to prevent unnecessary rotation, simultaneously
Also it is accurately positioned the relative position of connecting rod 2, sleeve 4, facilitates subsequent installation cooler joint 8.Now by nut from
The taper end of connecting rod 2 is inserted in, and is connected with the screwed tight of connecting rod 2 butt end by screw thread, and nut is by tight for the step of sleeve 4
It is pressed on connecting rod 2.Finally the nose circle of test specimen lid 5 is connected with sleeve 4 by screw thread, it is not necessary to tighten.The completeest
Become the assembling of upper fixture.
The structure of lower clamp is identical with the structure of upper fixture, and assembling process is identical, completes the assembling of lower clamp.
After completing the assembling of upper and lower fixture, respectively the joint in upper and lower fixture is put in fatigue machine hydraulic chuck fixture block,
Then clamping fatigue machine fixture block.Complete the installation of fixture.
Hollow pole test specimen in Fig. 8 is screwed in the test specimen lid 5 in upper and lower fixture respectively, now notes open circles
The thread segment of rod test specimen 6 gripping section exceedes test specimen lid 5 reach, makes the sky of hollow pole test specimen 6 end and connecting rod 2
Core bar contacts.Now tighten upper and lower test specimen lid respectively, eliminate thread pitch.Now complete the installation of test specimen.
Such as Fig. 9, the holder part comprising test specimen is put in high temperature furnace.
Drawing compression cooling gas sebific duct from air compressor, sebific duct is connected, with sealing with the cooling gas joint 8 in upper fixture
Ring compresses sebific duct and cooling gas joint 8.
Cooling air-flow sprays from the cooling gas joint of lower clamp after upper fixture hollow pole test specimen lower clamp.
If temperature is too high, should direct air flow out from the cooling gas joint 8 of lower clamp and cool down, prevent high temperature gas flow to other
The damage of instrument.So far the installation of a whole set of fixture.
From above-mentioned specific implementation process it is found that present clip is possible not only to carry out hollow pole test specimen at high temperature carries
The stretching/compressing test of thermograde, it is also possible to meet the demand of solid pole test specimen drawing by high temperature/repeated compression test.
Of course, the stretching/compressing test under present clip can be used for room temperature.Additionally, when off-test test specimen, if
Test specimen ruptures the most completely, is passed through cooling gas, is greatly improved test specimen while now opening high temperature furnace natural cooling test specimen
Cooldown rate, substantially reduces the waiting time of dismounting test specimen.
Claims (3)
1. the high temperature push-pull fatigue test cramp of a hollow pole test specimen, it is characterised in that including: joint (1), company
Bar (2), sleeve (4), test specimen lid (5), hollow pole test specimen (6), dormant bolt (7) and cooler connect
Head (8)；The optical wand end of joint (1) is connected with fatigue machine, and the other end is by six dormant bolts (7) and connecting rod (2)
Butt end be connected；The hollow stem part of connecting rod (2) is inserted in sleeve (4), and connecting rod (2) and sleeve (4) pass through spiral shell
Female (3) are threaded；Hollow pole test specimen (6) threadeds with test specimen lid (5)；Test specimen lid (5) and sleeve (4)
Threaded；The end of hollow pole test specimen (6) is withstood by the hollow stem of connecting rod (2)；Cooler joint (8) is worn
Cross the hole of sleeve (4), threaded with the hollow parts of connecting rod (2)；
Hollow stem in described connecting rod (2) connects with hollow pole test specimen (6), forms the cooling gas of hollow pole test specimen
Circulation road.
Hollow pole test specimen high temperature push-pull fatigue test cramp the most according to claim 1, it is characterised in that: institute
State the end compression of the hollow stem in connecting rod (2) and hollow pole test specimen (6), hollow pole test specimen (6) can be eliminated
And thread pitch between test specimen lid (5), test specimen lid (5) and sleeve (4).
Hollow pole test specimen high temperature push-pull fatigue test cramp the most according to claim 1, it is characterised in that: institute
State sleeve (4) and there is the hole of the external diameter slightly larger than cooling gas joint (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510232959.2A CN104792612B (en) | 2015-05-08 | 2015-05-08 | A kind of high temperature push-pull fatigue test cramp of hollow pole test specimen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510232959.2A CN104792612B (en) | 2015-05-08 | 2015-05-08 | A kind of high temperature push-pull fatigue test cramp of hollow pole test specimen |
Publications (2)
| Publication Number | Publication Date |
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| CN104792612A CN104792612A (en) | 2015-07-22 |
| CN104792612B true CN104792612B (en) | 2016-08-17 |
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| CN106769429A (en) * | 2017-01-20 | 2017-05-31 | 东北大学 | The improved method that a kind of thermal expansion phase transformation instrument drawing by high temperature sample has thermograde |
| CN108267350A (en) * | 2018-03-13 | 2018-07-10 | 北京航空航天大学 | The test block of part drawingand pressing fatigue performance is influenced for studying machining surface integrity |
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| CN105157864B (en) * | 2015-10-13 | 2017-11-10 | 北京航空航天大学 | The measuring method of hollow pole test specimen inner wall temperature |
| CN107543762A (en) * | 2017-07-10 | 2018-01-05 | 国网浙江省电力公司丽水供电公司 | A kind of fatigue experimental device and method for applying evenly load |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5581040A (en) * | 1995-11-01 | 1996-12-03 | Lin; Wei-Hwang | Multi-functional hydraulic grip |
| CN102901675A (en) * | 2012-10-16 | 2013-01-30 | 北京化工大学 | PVT (Process Verification Test) relation testing device for plunger cylinder type polymer |
| CN103278414B (en) * | 2013-05-10 | 2015-04-08 | 沈阳工业大学 | Thermal fatigue testing machine |
| CN204101375U (en) * | 2014-09-29 | 2015-01-14 | 北京理工大学 | Axial fatigue performance test fixture |
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2015
- 2015-05-08 CN CN201510232959.2A patent/CN104792612B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106769429A (en) * | 2017-01-20 | 2017-05-31 | 东北大学 | The improved method that a kind of thermal expansion phase transformation instrument drawing by high temperature sample has thermograde |
| CN108267350A (en) * | 2018-03-13 | 2018-07-10 | 北京航空航天大学 | The test block of part drawingand pressing fatigue performance is influenced for studying machining surface integrity |
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| CN104792612A (en) | 2015-07-22 |
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Effective date of registration: 20200707 Address after: 065500 aviation power science and technology innovation port, emerging industry demonstration zone, Gu'an County, Langfang City, Hebei Province (north side of Jinxiu Avenue and west side of Guotai Road) Patentee after: Langfang Zhichi Power Technology Co., Ltd Address before: 100191 Haidian District, Xueyuan Road, No. 37, Patentee before: BEIHANG University |
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