CN110132739A - A kind of fretting fatigue testing normal load loading device and method - Google Patents
A kind of fretting fatigue testing normal load loading device and method Download PDFInfo
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- CN110132739A CN110132739A CN201910443359.9A CN201910443359A CN110132739A CN 110132739 A CN110132739 A CN 110132739A CN 201910443359 A CN201910443359 A CN 201910443359A CN 110132739 A CN110132739 A CN 110132739A
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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
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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
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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
- G01N2203/0073—Fatigue
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention relates to a kind of fretting fatigue testing normal load loading device and methods.There are two parts to form for the loading device: fixed part and load loading section.It specifically includes: fine motion pad, the first grip block, the second grip block, load cell, load control screw, stop nut, Limit screw, location nut, stop nut, bushing, fixed plate, fixing bolt, inside fixed block, outside fixed block.The present invention, which is realized, carries out fretting fatigue testing on common fatigue tester.
Description
Technical field
The present invention relates to fretting fatigue testing fields, are a kind of micro- to standard specimen progress for laboratory specifically
The loading device and method of normal load in dynamic fatigue test.
Background technique
Tenon coupling structure is widely adopted in aero-engine axial-flow type compressor, turbine and some other dynamic power machine.
Fretting fatigue can accelerate the germinating and extension of the crackle at tenon connection position, the failure of acceleration means.The compressor of aero-engine
Disk and blade titanium alloy manufacture is widely used, and titanium alloy is very sensitive to fretting fatigue.
It, need to be in labs fretting fatigue testing for the fretting fatigue characteristic of research material.Common single shaft fatigue examination
The machine of testing can not apply normal load to standard specimen, therefore cannot be used directly for fretting fatigue testing.Currently, fretting fatigue testing
Carried out by multiaxle fatigue experimental machine or applies normal direction to test specimen by increasing device on single shaft fatigue testing machine
Load carries out test.The device for applying normal force in fretting fatigue testing at present is loaded by hydraulic loaded and loaded ring,
The normal load that hydraulic loaded can apply is bigger, but due to being the left and right sides while loading, even control program
It is difficult to ensure that the normal load of the left and right sides can be in the same size, therefore, test specimen is possible to be influenced to try by additional moment of flexure
Test precision；Although and loaded ring load can overcome the problems, such as this, due to loaded ring, this body structure is too simple, Bu Nengshi
Add very big normal load, and loaded ring is generally without axial restraint, so axial rigidity is smaller.
Summary of the invention
Technology of the invention solves the problems, such as: overcoming the shortcomings of in background technique, provides a kind of fretting fatigue testing normal direction
Load charger and method realize the purpose for carrying out fretting fatigue testing on common fatigue tester.The present invention is comprehensive
The advantages of existing two class device, while capable of applying larger normal load to test specimen, is realized unilateral further through mechanical structure
Load avoids because load asymmetry brings additional moment of flexure to test specimen.
The technology of the present invention solution: a kind of fretting fatigue testing normal load loading device, comprising: test specimen (1), fine motion
Pad (2), the first grip block (3), the second grip block (4), load cell (5), load control screw (6), fixed plate (7), limit
Position screw rod (8), outside fixed block (10), inside fixed block (11), stop nut (12), axle sleeve (13), is consolidated stop nut (9)
Determine screw rod (14) and location nut (15).Outside fixed block (10) and inside fixed block (11) are under bolt effect by entire normal direction
Load charger is fixed on the column of fatigue tester two sides, and inside fixed block (11) is connected and fixed screw rod (14), solid
The corresponding position of fixed board (7) is provided with threaded hole for being connected and fixed screw rod (14).Limit screw is used between the fixed plate (7) of two sides
(8) couple, location nut (15) is mounted on Limit screw (8), is provided with through-hole in the corresponding position of fixed plate (7), is positioned spiral shell
The effect of female (15) is to position to the fixed plate on right side (7), and stop nut (9) and location nut (15) clamp right side together
Fixed plate (7), to achieve the effect that fixed.Second grip block is provided with threaded hole on the right side of (4), by screw by force-measuring sensing
Device (5) is mounted on the second grip block (4).Load control screw (6) passes through the threaded hole on the first grip block (3) right side plate
Afterwards, nut (12) are loosened in installation, are withstood on load cell (5) later.In the first grip block (3) and the second grip block (4)
Corresponding position is provided with through-hole, so that Limit screw (8) passes through, thus, whole device is just capable of fixing in fatigue tester two sides
Column on.Rectangular channel is provided in advance on the left plate and the second grip block (4) of the first grip block (3) for installing fine motion
It pads (2)；In test, fretting fatigue normal load is applied by load control screw (6).In the first grip block (3), the second folder
Increase axle sleeve (13) between plate (4) and Limit screw (8) is held, plays the role of reducing abrasion.
The fretting fatigue normal load loading device can pass through change fine motion pad according to the difference of specific requirements
Geometry, size realize different fine motion pair forms.
The fretting fatigue normal load loading device can be installed to by the standing screw of replacement different length
On the fatigue tester of different model.
A kind of fretting fatigue testing normal load loading method of the present invention, comprising the following steps:
The first step, during the test, fretting fatigue normal force are applied by load control screw (6), load cell
(5) it is fixed on the second grip block (4), by tightening load control screw (6), load control screw (6) can first withstand on dynamometry
On sensor (5), under the action of Limit screw (8), load cell (5) moves downward together with the second grip block (4), directly
Fine motion pad (2) on to the second grip block (4) is contacted with test specimen (1), plays positioning action.The second grip block (4) does not exist later
Movement.
Second step, continue to tighten (6) meeting of load control screw later so that the first grip block (3) integrally move right, try
Fine motion pad (2) on the left of part (1) can be also pressed on test specimen.
Third step continues to tighten load control screw (6), and the fine motion pad (2) of two sides can be compressed with certain load
In the two sides of test specimen (1), achieve the purpose that apply normal load.After reaching expected normal load, stop nut is tightened
(12), it can be realized during the test the reduction for preventing normal load caused by thread looseness.Load cell (5) can be outer
As soon as joining a registration display, the size variation of normal force can be continued to monitor during the experiment.
Advantage is the present invention compared with prior art:
(1) since first fixation does not ensure that pair positioned at two fine motion pads to test specimen on the collet up and down of fatigue tester
Title center makes test specimen be bent by asymmetric load.It is avoided that such case in the present invention, is utilizing load tune
Fine motion pad can symmetrically navigate to the two sides of test specimen automatically during section screw application normal load.
(2) the configuration of the present invention is simple can apply biggish normal load.It is capable of fixing on fatigue tester, it is axial rigid
Degree is big.With wide applicability, the fatigue tester of different model can be used for.
Detailed description of the invention
Fig. 1 is loading device overall structure main view of the present invention；
Fig. 2 is loading device overall structure equal axes axonometric drawing of the present invention；
Fig. 3 is the equal axes axonometric drawing of the first grip block in loading device of the present invention.
Specific embodiment
Invention is described in detail with reference to the accompanying drawings and embodiments.
Firstly, whole device needs to fix by the column of fatigue tester two sides with fatigue tester.
As shown in Figure 1-3, the entire fretting fatigue normal load loading device of the present invention is divided into two parts: fixed part and
Load loading section；
Load loading section includes fine motion pad 2, the first grip block 3, the second grip block 4, load cell 5, load control
Screw 6, stop nut 12 and axle sleeve 13.Fine motion pad 2 can be tested according to different needs and be needed replacing.First grip block, 3 Fig. 3 by
For two pieces of left and right plate by four bar connections, the right side opening of the plate on the left side is fluted for placing fine motion pad 2, the plate on the right
It is provided with tapped through hole and adjusts screw 6 for installed load, load control screw 6 withstands on load cell 5 after passing through tapped through hole
On, load cell 5 is screwed on the right side of the second grip block 4, and the left side of the second grip block 4 is also provided with groove for pacifying
Fill fine motion pad 2.Through-hole is provided on the corresponding position of the first grip block 3 and the second grip block 4, Limit screw 8 is logical across these
Hole is fixed in the fixed plate 7 of two sides, to limit the displacement of load loading section, allowable load loading section is in normal direction side
The direction x movement i.e. in Fig. 1 upwards.
Fixed part is by fixed plate 7, Limit screw 8, stop nut 9, outside fixed block 10, inside fixed block 11, fixation
Screw rod 14 and location nut 15 form.Respectively there are one piece of fixed plate 7 in two sides, and the effect of fixed plate 7 is to support Limit screw 8.According to
Load loading section is supported by Limit screw 8.So Limit screw is mainly in the gravity and test by load loading section
The effect of normal load frictional force caused by contact area, the two power are all the directions y in i.e. Fig. 1 of vertical direction.Institute
With need to check Limit screw 8 by it is curved when intensity.The effect of location nut 15 is positioned to the fixed plate 7 on right side, and spiral shell is limited
Mother 9 and location nut 15 clamp the fixed plate 7 on right side, to play the role of the fixed plate 7 on fixed right side.In the left and right sides
The corresponding position of fixed plate 7 is provided with tapped through hole, and the corresponding position of interior fixed block 11 is equipped with stepped hole for installing standing screw
14, standing screw 14 passes through stepped hole and is assembled in the tapped through hole in fixed plate 7.Finally, 10 He of outside fixed block of two sides
Entire normal load loading device is fixed on the column of fatigue tester two sides by inside fixed block 11 under bolt effect.
It during the test, first will be on the collet up and down of 1 clamping of test specimen to fatigue tester.Load, which is applied through, tightens
Load control screw 6, load control screw 6 can first be withstood on load cell 5, and the second grip block 4 is driven to move downward, until
After the fine motion pad 2 on right side is contacted with test specimen 1, the second grip block 4 is no longer moved, and plays the effect of positioning.It then proceedes to tighten load
Lotus adjusts screw 6, and under the action of screw thread, the first grip block 3 can be moved right, until the fine motion pad 2 in left side is also pressed on examination
On part 1, continue to tighten load control nut 6, the fine motion pad 2 of two sides can be pressed on test specimen two with the normal load of a certain numerical value
Side.After size needed for reaching test in normal load, stop nut 12 is tightened.Load cell 5 external connection, one display,
The size of normal load can be monitored.Stop nut 12 can ensure that normal direction will not be led to because of thread looseness during the test
The reduction of load.
To reduce the abrasion between the first grip block 3, the second grip block 4 and Limit screw 8, in the first grip block 3 and the
Increase axle sleeve 13 between the through-hole and Limit screw 8 of two grip blocks 4.
After the end of the test, stop nut 12 is first unclamped, then unscrews load control screw 6,5 external connection of load cell is shown
Show that device registration is reduced to after 0, continues to unclamp load control screw 6, the first grip block 3 can move downward, in the first grip block 3
After moving downward a distance, just there are enough spaces to take out test specimen.
Non-elaborated part of the present invention belongs to techniques well known.
The above, part specific embodiment only of the present invention, but scope of protection of the present invention is not limited thereto, appoints
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of, should all cover by what those skilled in the art
Within protection scope of the present invention.
Claims (4)
1. a kind of fretting fatigue testing normal load loading device characterized by comprising test specimen (1), fine motion pad (2), first
Grip block (3), the second grip block (4), load cell (5), load control screw (6), fixed plate (7), Limit screw (8),
Stop nut (9), outside fixed block (10), inside fixed block (11), stop nut (12), axle sleeve (13), standing screw (14)
With location nut (15)；Outside fixed block (10) and inside fixed block (11), which load entire normal load under bolt effect, to be filled
It sets and is fixed on the column of fatigue tester two sides, inside fixed block (11) is connected and fixed screw rod (14), pair in fixed plate (7)
Position is answered to be provided with threaded hole for being connected and fixed screw rod (14)；Coupled between the fixed plate (7) of two sides with Limit screw (8), it is fixed
Position nut (15) is mounted on Limit screw (8), is provided with through-hole, the work of location nut (15) in the corresponding position of fixed plate (7)
Be give the fixed plate on right side (7) positioning, and stop nut (9) and location nut (15) clamp together on the right side of fixed plate (7),
It is fixed to achieve the effect that；Second grip block is provided with threaded hole on the right side of (4), is installed load cell (5) by screw
On the second grip block (4)；After load control screw (6) passes through the threaded hole on the first grip block (3) right side plate, install locking
Nut (12) is withstood on later on load cell (5)；It is provided in the corresponding position of the first grip block (3) and the second grip block (4)
Through-hole, so that Limit screw (8) passes through, thus, whole device is just capable of fixing on the column of fatigue tester two sides；?
Rectangular channel is provided on the left plate and the second grip block (4) of first grip block (3) in advance for installing fine motion pad (2)；It is testing
In, fretting fatigue normal load is applied by load control screw (6), in the first grip block (3), the second grip block (4) and limit
Increase axle sleeve (13) between position screw rod (8), plays the role of reducing abrasion.
2. a kind of fretting fatigue testing normal load loading device according to claim 1, it is characterised in that: according to specific
The difference of demand, by changing the geometry of fine motion pad, size realizes different fine motion pair forms.
3. a kind of fretting fatigue testing normal load loading device according to claim 1, it is characterised in that: pass through replacement
The standing screw of different length, is installed on the fatigue tester of different model.
4. a kind of fretting fatigue testing normal load loading method, which comprises the following steps:
The first step, during the test, fretting fatigue normal force are applied by load control screw (6), and load cell (5) is solid
It is scheduled on the second grip block (4), by tightening load control screw (6), load control screw (6) can first withstand on load cell
(5) on, under the action of Limit screw (8), load cell (5) moves downward together with the second grip block (4), until second
Fine motion pad (2) on grip block (4) is contacted with test specimen (1), plays positioning action, and the second grip block (4) no longer moves later；
Second step continues to tighten load control screw (6) and the first grip block (3) is integrally moved right, on the left of test specimen (1)
Fine motion pad (2) can be also pressed on test specimen；
Third step continues to tighten load control screw (6), and the fine motion pad (2) of two sides can be pressed on examination with certain load
The two sides of part (1) achieve the purpose that apply normal load；After reaching expected normal load, stop nut (12), energy are tightened
Enough to realize the reduction for preventing normal load caused by thread looseness during the test, load cell (5) can be external connection one
Registration display can continue to monitor the size variation of normal force during the experiment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910443359.9A CN110132739B (en) | 2019-05-24 | 2019-05-24 | Micro fatigue test normal load loading device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910443359.9A CN110132739B (en) | 2019-05-24 | 2019-05-24 | Micro fatigue test normal load loading device and method |
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| CN110132739A true CN110132739A (en) | 2019-08-16 |
| CN110132739B CN110132739B (en) | 2020-12-29 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110702544A (en) * | 2019-10-15 | 2020-01-17 | 常州达姆斯检测技术有限公司 | Fatigue detection device with reinforcing rib parts on surface |
| CN111650063A (en) * | 2020-07-02 | 2020-09-11 | 天津科技大学 | Normal load loading device based on single-shaft fatigue testing machine |
| CN113092290A (en) * | 2021-03-26 | 2021-07-09 | 太原理工大学 | External prestress reinforced concrete beam fatigue test device and method |
| CN114199487A (en) * | 2021-12-07 | 2022-03-18 | 中国第一汽车股份有限公司 | Motor shell vibration fatigue test device and test method |
| CN115076205A (en) * | 2022-06-22 | 2022-09-20 | 东方电气风电股份有限公司 | Novel bolt anti-loosening method applied to oil immersion environment of wind generating set |
| CN115266312A (en) * | 2022-09-14 | 2022-11-01 | 浙江工业大学 | Micro-motion fatigue transverse loading device based on different testing machine types |
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| CN111650063A (en) * | 2020-07-02 | 2020-09-11 | 天津科技大学 | Normal load loading device based on single-shaft fatigue testing machine |
| CN113092290A (en) * | 2021-03-26 | 2021-07-09 | 太原理工大学 | External prestress reinforced concrete beam fatigue test device and method |
| CN114199487A (en) * | 2021-12-07 | 2022-03-18 | 中国第一汽车股份有限公司 | Motor shell vibration fatigue test device and test method |
| CN115076205A (en) * | 2022-06-22 | 2022-09-20 | 东方电气风电股份有限公司 | Novel bolt anti-loosening method applied to oil immersion environment of wind generating set |
| CN115266312A (en) * | 2022-09-14 | 2022-11-01 | 浙江工业大学 | Micro-motion fatigue transverse loading device based on different testing machine types |
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