CN106840927B - The compound fretting fatigue testing equipment of tension-torsion and test method - Google Patents
The compound fretting fatigue testing equipment of tension-torsion and test method Download PDFInfo
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- CN106840927B CN106840927B CN201611197415.8A CN201611197415A CN106840927B CN 106840927 B CN106840927 B CN 106840927B CN 201611197415 A CN201611197415 A CN 201611197415A CN 106840927 B CN106840927 B CN 106840927B
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- 238000009661 fatigue test Methods 0.000 title claims abstract description 19
- 238000010998 test method Methods 0.000 title claims abstract description 8
- 150000001875 compounds Chemical class 0.000 title abstract description 17
- 238000011068 loading method Methods 0.000 claims abstract description 21
- 230000008878 coupling Effects 0.000 claims abstract description 5
- 238000010168 coupling process Methods 0.000 claims abstract description 5
- 238000005859 coupling reaction Methods 0.000 claims abstract description 5
- 238000012360 testing method Methods 0.000 claims description 23
- 238000005259 measurement Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 9
- 239000002131 composite material Substances 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 230000008676 import Effects 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims 1
- 238000002474 experimental method Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
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- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/38—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by electromagnetic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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Abstract
The invention discloses the compound fretting fatigue testing equipment of tension-torsion and test methods, the compound fretting fatigue testing equipment of the tension-torsion includes mounting ring, radial positioning device, loading device, power device and the image collecting device for acquiring sample axis radial direction image, and each radial positioning device and sample axis contact position are provided with three-dimension sensor；Loading device includes sleeve, and annular convex platform is provided in the middle part of sleeve, and bottom margin offers at least three arc grooves, and spaced set has grip block in sleeve, and each grip block passes through in the threaded hole that the stud being fixedly installed thereon is installed on sleeve；After placing upper ball in the arc groove of sleeve, the lower end of sleeve is placed in accommodating groove, fixed plate is fixedly connected by shaft coupling with worm screw；Power device includes motor, and the turbine being arranged on the output shaft of motor is engaged with worm screw；An angle acquisition device for rotation angle when acquiring sample shaft experiment is provided on annular convex platform.
Description
Technical field
The invention belongs to wheel shafts to be interference fitted testing fatigue field, and in particular to a kind of compound fretting fatigue testing of tension-torsion is set
Standby and test method.
Background technique
Fretting fatigue refers between the contact surfaces of two contact workpieces due to mechanical oscillation, fatigue load, electric and magnetic oscillation or heat
The relative displacement for the minimum amplitude (micron dimension) that circulation etc. occurs under alternate load effects, thus bring high stress concentrations with
And the fatigue behaviour of abrasion.
Fretting fatigue is widely present in each industrial circle such as machinery industry, railway, nuclear power, aerospace, bridge, ship
Immovable fitting component in, harm is very serious and extremely fearful, and has become many key components and parts failures
The main reason for, such as: the connectors such as rivet interlacement, threaded connection, pin shaft connection, spline fitted, tongue and groove fit, wheel shaft interference
Cooperation, wirerope, high altitude wire etc., these fatigue phenomenons are all since some position of connector is lost by fretting fatigue
Effect.
Fretting fatigue presses the loading method of sample, can be divided into that tension and compression, tension-torsion be compound and three kinds of basic models of bending, for
The fretting fatigue form of point contact, test contact model can be horizontal cylinder or vertical cylinder；For the fine motion of line contact
Tired form, test contact model can be horizontal cylinder or plane.
Currently, the research of fretting fatigue is concentrated mainly on tension and compression mode, ground in the world about the fretting fatigue of hub material
Study carefully and be also all limited only to tension and compression mode, horizontal (normal direction) load is applied to two sides fine motion pad in fretting fatigue testing, so that two
Side fine motion pad and sample keep press-fit (tight fit), this mode are tested at present to the device is complicated, test result compared with
Difference, sample is easy to happen parameter buckling phenomenon during the loading process, and strain displacement measure of the change is more difficult during test.
Summary of the invention
For above-mentioned deficiency in the prior art, the compound fretting fatigue testing equipment of tension-torsion provided by the invention and test side
Method can realize stretching and and torsion test in test, while to sample axis.
In order to achieve the above object of the invention, the technical solution adopted by the present invention are as follows:
In one embodiment of the invention, a kind of compound fretting fatigue testing equipment of tension-torsion is provided comprising mounting ring,
At least three radial positioning devices for being equidistantly mounted in mounting ring, being positioned for the radial direction to sample axis, for pressing from both sides
It holds sample shaft end portion, carry out the loading device of tension-torsion composite testing and for providing the power device of power to loading device；Phase
The image collecting device for being acquired to sample axis radial direction image, Mei Gejing are provided between adjacent two radial positioning devices
Positioning device and sample axis contact position are provided with three-dimension sensor；
Loading device includes sleeve, and annular convex platform is provided in the middle part of sleeve, and bottom margin offers at least three arcs
Shape slot, the angle between line and sleeve lateral wall between the deepest point and the arc groove center of circle of arc groove is less than 90 °；In sleeve etc.
Spacing is provided at least three pieces for clamping sample shaft end portion and arc-shaped grip block, and each grip block by fixing thereon
The stud of setting is installed in the threaded hole on sleeve；
After placing upper ball in the arc groove of sleeve, the lower end of sleeve is placed in accommodating groove, the internal diameter of accommodating groove is big
In sleeve and the consitutional outer diameter of ball；Accommodating groove is placed in fixed plate, and by being connected and fixed plate and annular convex platform
Bolt sleeve is fixed in fixed plate；Fixed plate is fixedly connected by shaft coupling with worm screw；Power device includes motor,
The turbine being arranged on the output shaft of motor is engaged with worm screw；
An angle acquisition device for rotation angle when acquiring sample shaft experiment, angle acquisition are provided on annular convex platform
Device includes the supporting block being fixed on annular convex platform and is set to supporting block upper end and is tightly attached to the arc panel of sleeve outer surface；
Arc groove is offered on arc panel, and several graduation marks are provided on the arc panel of arc groove upper end；Clamping is placed in arc groove
In the measurement axis in the mounting hole of sample axis, the free end for measuring axis is provided with the pointer of instruction rotation angle；It is set in supporting block
One is equipped with for acquiring the image acquisition device of pointer rotational case；Image collecting device, three-dimension sensor, image acquisition device and electricity
Motivation is connect with control module.
In another embodiment of the present invention, a kind of test method of compound fretting fatigue testing equipment of tension-torsion is provided,
Method includes the following steps:
A, the mounting hole to match with the measurement shaft diameter is respectively processed respectively at the both ends of sample axis；
B, sample axis is passed through into radial positioning device, and its both ends is placed among several grip blocks in sleeve, adjusted
Section stud is in close contact all grip blocks and sample axis, while the measurement axis of angle acquisition device being anchored in mounting hole；
C, the screw rod for adjusting radial positioning device makes all fine motion blocks clamp sample axis, until pressure sensor acquires
Pressure value reach the clamping force of setting；
D, the information for applying preset tension-torsion combined load is issued to motor by control module, motor drives load
Device stretches the sample axis, ball discontinuity and drive sample axis to make rotating motion；
E, during relative motion occurs with fine motion block when sample axis rotates, the three-dimension sensor contacted with sample axis is real
When measure normal force and frictional force, and send to control module；
F, starting image collecting device, image acquisition device moment acquire sample axis while control module control motor
Rotate the amplitude of deformation of angle and sample axis；
G, the picture for the embodiment rotational steps and sample axis that control module feeds back image collecting device and image acquisition device
Displacement Analysis software is imported, the rotation angle of sample axis and the amplitude of deformation of sample axis are obtained.
The invention has the benefit that loading device is when being stretched power, due to the uniqueness of its internal ball position
It can be decomposed into vertical direction and lateral power by power by setting, and under Lateral Force, ball band moving sleeve revolves
Turn, and then sample axis is driven to do slight rotation, to reach tension-torsion composite testing.
While sample axis rotates, the measurement axis being fixed on sample axis also and then rotates, and measures the pointer and arc on axis
Graduation mark on shape plate matches and realizes the display of the final angle of measurement axis rotation；In addition, image acquisition device can be to finger
The dynamic rotary of needle carries out Image Acquisition, and the data of the image combination image acquisition device of acquisition can achieve to measurement
The dynamic rotary process of axis is analyzed.
Detailed description of the invention
Fig. 1 is that mounting ring, radial positioning device and the loading device of the compound fretting fatigue testing equipment of tension-torsion are assembled in one
It rises and clamps the top view after sample axis.
Fig. 2 is the cross-sectional view along the direction Fig. 1 middle line A-A.
Fig. 3 is the loading device of the compound fretting fatigue testing equipment of tension-torsion and the structural representation that power device fits together
Figure.
Fig. 4 is that angle acquisition device is mounted on the perspective view on the annular convex platform of sleeve.
Wherein, 1, radial positioning device；11, screw rod；12, mounting blocks；13, support plate；14, guide rail；15, sliding block；16, micro-
Motion block；2, mounting ring；3, sample axis；4, loading device；41, sleeve；411, axis is measured；412, annular convex platform；42, grip block；
43, supporting block；431, graduation mark；432, arc groove；44, fixed plate；45, shaft coupling；46, worm screw；47, ball；48, stud；
5, power device；51, motor；52, turbine.
Specific embodiment
A specific embodiment of the invention is described below, in order to facilitate understanding by those skilled in the art this hair
It is bright, it should be apparent that the present invention is not limited to the ranges of specific embodiment, for those skilled in the art,
As long as various change is in the spirit and scope of the present invention that the attached claims limit and determine, these variations are aobvious and easy
See, all are using the innovation and creation of present inventive concept in the column of protection.
Mounting ring 2, the radial positioning device 1 of the compound fretting fatigue testing equipment of tension-torsion are shown with reference to Fig. 1 and Fig. 3, Fig. 1
The top view after clamping sample axis 3 is fitted together with loading device 4, Fig. 3 shows the compound fretting fatigue testing of tension-torsion and sets
The structural schematic diagram that standby loading device 4 and power device 5 fits together.
As shown in figures 1 and 3, the compound fretting fatigue testing equipment of the tension-torsion includes mounting ring 2, at least three equidistant peaces
The radial positioning device 1 positioned in mounting ring 2, for the radial direction to sample axis 3, for clamp 3 end of sample axis,
Carry out the loading device 4 of tension-torsion composite testing and for providing the power device 5 of power to loading device 4；Two neighboring radial direction
The image collecting device for being acquired to the radial image of sample axis 3, each radial positioning dress are provided between positioning device 1
It sets 1 and 3 contact position of sample axis is provided with three-dimension sensor.
When implementation, radial positioning device 1 is preferably equally spacedly installed in mounting ring 2, it is multiple into radial positioning device 1
Selection sample axis 3 can be made to be uniformly distributed in the clamping force being radially subject to, make sample axis 3 the process of load be not in ginseng
Number buckling phenomenon, test repeatability are good.
All radial positioning devices 1 are installed in mounting ring 2, are greatly reduced the number of components of testing equipment, are made
It is simpler to obtain entire testing equipment, it is light, and the spatial position for the adjustment radial positioning device 1 that can be convenient, it is suitable for
The sample axis of various length.
As shown in figure 3, loading device 4 includes sleeve 41, the middle part of sleeve 41 is provided with annular convex platform 412, bottom sides
Edge offers at least three arc grooves 432, the line between 432 center of circle of deepest point and arc groove of arc groove 432 and sleeve 41
Angle between side wall is less than 90 °；The setting of above-mentioned angle can be such that power suffered by ball 47 is not located on straight line,
The power can be broken down into horizontal and vertical component in this way, and such ball 47 is under lateral component effect, band moving sleeve 41
It makes rotating motion.
Spaced set has at least three pieces to be used to clamp 3 end of sample axis and arc-shaped grip block 42 in sleeve 41, often
A grip block 42 passes through the stud 48 being fixedly installed thereon and is installed in the threaded hole on sleeve 41；Multiple grip blocks 42 are set
It sets, when applying drawing force to sample axis 3,3 stress of sample axis can be made relatively uniform, thus the accuracy of guarantee test, separately
Its outer sample axis that can be applicable to different-diameter.
After placing upper ball 47 in the arc groove 432 of sleeve 41, the lower end of sleeve 41 is placed in accommodating groove, accommodating groove
Internal diameter slightly larger than sleeve 41 and the consitutional outer diameter of ball 47, when design, preferably the internal diameter of accommodating groove than sleeve 41 with
The 47 big 0.2cm of consitutional outer diameter of ball；The design of above-mentioned size can not press in accommodating groove certain to avoid ball 47
Rule sliding, to improve the accuracy for rotating angle acquisition to sample axis 3 below.
Accommodating groove is placed in fixed plate 44, and the bolt by being connected and fixed plate 44 and annular convex platform 412 is by sleeve 41
It is fixed in fixed plate 44；Fixed plate 44 is fixedly connected by shaft coupling 45 with worm screw 46；Power device 5 includes motor 51,
The turbine 52 being arranged on the output shaft of motor 51 is engaged with worm screw 46.
As shown in figure 4, being provided with one on annular convex platform 412 for acquiring the angle of rotation angle when sample axis 3 is tested
Collector, angle acquisition device include the supporting block 43 being fixed on annular convex platform 412 and are set to 43 upper end of supporting block and are close to
Arc panel in 41 outer surface of sleeve.
Arc groove 432 is offered on arc panel, and several graduation marks 431 are provided on the arc panel of 432 upper end of arc groove；Arc
The measurement axis 411 being installed in the mounting hole of sample axis 3 is placed in shape slot 432, the free end of measurement axis 411 is provided with instruction
Rotate the pointer of angle；One is provided in supporting block 43 for acquiring the image acquisition device of pointer rotational case.
While sample axis 3 rotates, the measurement axis 411 being fixed on sample axis 3 also and then rotates, and measures the pointer on axis
The display of the final angle of measurement axis rotation is matched and realized with the graduation mark 431 on arc panel；In addition, image acquisition device energy
Enough dynamic rotaries to pointer carry out Image Acquisition.
Image collecting device, three-dimension sensor, image acquisition device and motor 51 are connect with control module.Image Acquisition
The data of the image combination image acquisition device of device acquisition, which can achieve, analyzes the dynamic rotary process of measurement axis.
As shown in Fig. 2, radial positioning device 1 includes screw rod 11 and the mounting blocks 12 being respectively and fixedly installed in mounting ring 2
With support plate 13, two guide rails 14 are provided in support plate 13, the sliding block 15 that can be slid along is installed on guide rail 14；Sliding block 15
Connecting rod on be provided with a fine motion block 16, three-dimension sensor is installed between fine motion block 16 and sample axis 3；Screw rod 11 passes through peace
The end of dress block 12 and mounting ring 2 is fixed in support plate 13, is provided with one and control module between support plate 13 and screw rod 11
The pressure sensor of connection.
Three-dimension sensor measures the normal force and frictional force that sample axis 3 is subject to during the test in real time, and send to control
Molding block, control module obtain sample axis 3 variation of coefficient of friction and fretting fatigue service life under different operating conditions by analysis；
When implementation, the depth of the preferred accommodating groove of this programme is equal to annular convex platform 412 to being installed on ball 47 in arc groove 432
The distance of minimum point.Setting can be to avoid in tension test axis in this way, and accommodating groove relative sleeve 41 moves, and torsion is caused to test
Inaccuracy.
Image collecting device and image acquisition device select high-speed camera, and high-speed camera improves the image of acquisition
Quality.
So far, the description to the compound fretting fatigue testing equipment of tension-torsion is completed, it is then tired to the compound fine motion of tension-torsion below
The test method of labor testing equipment is described in detail:
The test method of the compound fretting fatigue testing equipment of the tension-torsion the following steps are included:
A, the mounting hole to match with measurement 411 diameter of axis is respectively processed respectively at the both ends of sample axis 3；
B, sample axis 3 is passed through into radial positioning device 1, and its both ends is placed in several grip blocks 42 in sleeve 41
Between, adjusting stud 48 is in close contact all grip blocks 42 with sample axis 3, while the measurement axis 411 of angle acquisition device being fastened
In in mounting hole；
C, the screw rod 11 for adjusting radial positioning device 1 makes all fine motion blocks 16 clamp sample axis 3, until pressure sensing
The pressure value of device acquisition reaches the clamping force of setting；
D, the information for applying preset tension-torsion combined load is issued to motor 51 by control module, motor 51 drives
4 tensile sample axis 3 of loading device, 47 discontinuity of ball and drive sample axis 3 to make rotating motion；
E, during relative motion occurs with fine motion block 16 when sample axis 3 rotates, the three-dimensional sensing that is contacted with sample axis 3
Device measures normal force and frictional force in real time, and send to control module；
F, starting image collecting device, image acquisition device moment acquire sample axis while control module control motor 51
3 rotation angle and the amplitude of deformation of sample axis 3；
G, the deformation for the embodiment rotational steps and sample axis 3 that control module feeds back image collecting device and image acquisition device
The picture of situation imports Displacement Analysis software, obtains the rotation angle of sample axis 3 and the amplitude of deformation of sample axis 3.
In conclusion the testing equipment can facilitate simulation fine motion point contact (horizontal cylinder/vertical cylinder), line contact (water
Flat round column/plane) form contact model fretting fatigue carry out normal direction load, the method Xiang Zaihe of setting can be reached well,
Range on probation is wide, easy to operate, and test result is accurate, reliable.
Although being described in detail in conjunction with attached drawing to a specific embodiment of the invention, should not be construed as special to this
The restriction of the protection scope of benefit.In range described by claims, those skilled in the art are without creative work
The various modifications and deformation that can make still belong to the protection scope of this patent.
Claims (3)
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| CN201611197415.8A CN106840927B (en) | 2016-12-22 | 2016-12-22 | The compound fretting fatigue testing equipment of tension-torsion and test method |
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| CN108088746A (en) * | 2017-12-19 | 2018-05-29 | 江苏师范大学 | A kind of metal tension and torsion deformation mechanics and characteristics of Acoustic Emission test and analysis method |
| CN108195672A (en) * | 2017-12-19 | 2018-06-22 | 江苏师范大学 | A kind of material tension-torsion bursting stress and the Forecasting Methodology in failure mechanics direction |
| CN109827857B (en) * | 2019-03-22 | 2020-10-23 | 北京理工大学 | Multi-parameter multi-axis fretting fatigue test device and method |
| CN111847084B (en) * | 2019-04-24 | 2022-07-05 | 拓卡奔马机电科技有限公司 | Spread cloth machine exhibition limit device with adjustable |
| CN110261222A (en) * | 2019-06-12 | 2019-09-20 | 江苏广宇建设集团有限公司 | Multi-shaft stretching creep test device and its test method |
| CN114608979A (en) * | 2022-03-22 | 2022-06-10 | 西南交通大学 | A bending-torsional composite high-temperature fretting fatigue test device |
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