CN110231235A - The experimental provision and experimental method of the two-way alternating bending of steel wire in a kind of test high and low temperature environment - Google Patents
The experimental provision and experimental method of the two-way alternating bending of steel wire in a kind of test high and low temperature environment Download PDFInfo
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- 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
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- 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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- G01N2203/025—Geometry of the test
- G01N2203/0252—Monoaxial, i.e. the forces being applied along a single axis of the specimen
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- G01N2203/026—Specifications of the specimen
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- G01N2203/028—One dimensional, e.g. filaments, wires, ropes or cables
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Abstract
The invention discloses the experimental provisions and experimental method of the two-way alternating bending of steel wire in a kind of test high and low temperature environment, belong to steel wire bent fatigue test technology field.The present invention is in the two-way repeated bending performance test experiments of steel wire, using new loading method.The fatigue tester loaded using axial push-pull is controlled, the loading method to be pumped using cylinder by the quantitative accurate of displacement, realizes steel wire alternating bending deformation load.And the experimental provision that steel wire bent deformation is realized in special cooperation tension and compression load is devised, the bending apparatus is simple for structure, and size is exquisite, and the space tracking of bending deformation is small, is adapted to be mounted in the narrow cavity of high and low temperature environment case and uses.New loading method is used cooperatively with the bending apparatus specially designed, can be realized steel wire double-deformation under the conditions of high and low temperature environment, alternately and repeatedly, the performance test of 90 degree of bending.
Description
Technical field
The present invention relates to steel wire bent fatigue test technology fields, and in particular to steel wire is double in a kind of test high and low temperature environment
To the experimental provision and experimental method of alternating bending.
Background technique
Existing metal material alternating bending test method follows GB/T 238-2002.Clear stipulaties room temperature in method
The experiment content of the two-way alternating bending of silk material, bend test equipment therefor are as shown in Figure 1 under environment.Its test philosophy are as follows: make to fill
The bend arm set is in vertical position, sample is inserted by driving lever hole, sample lower end is clamped with fixture block, and makes sample perpendicular to circle
Pillar support axis；When bend test, by sample free end 90-degree bent in the bending circular arc plane of predetermined radius, starting is returned to
Position, then 90-degree bent round about, return again to initial position, by this alternating, carry out continuously and alternating bending examination incessantly
It tests.The loading device that the test uses is relatively large sized, and the bending circular arc plane that steel wire is swung repeatedly, needs larger
Running space.Its loading method does not also have the condition of addition high and low temperature environment device.So not with existing apparatus and method
It is able to achieve the two-way repeated bending performance test of silk material in high and low temperature environment.
Summary of the invention
The purpose of the present invention is to provide it is a kind of test high and low temperature environment in the two-way alternating bending of steel wire experimental provision and
Experimental method, the method for the present invention loading method is steady, and Bit andits control is accurate, and bending deformation apparatus structure is exquisite.Loading method with
Deformation device matching, can effectively save experiment running space, and steel wire is two-way suitable for narrow space inside high and low temperature environment case
Alternating bending test uses.
To achieve the above object, scheme of the present invention is as follows:
The experimental provision of the two-way alternating bending of steel wire in a kind of test high and low temperature environment, including axial fatigue machine, height
Low temperature environment chamber and bending apparatus；The high-low-temperature environmental testing case is set to the crossbeam and workbench of fatigue tester
Between, for proposing the temperature environment that is for experiment；The bending apparatus is set in high-low-temperature environmental testing case；Wherein:
The bending apparatus includes testing microscope carrier and pressure head, and diametrically position is machined with square on the test microscope carrier upper surface
Shape groove；The top of the test microscope carrier is separated out two supporting tables being oppositely arranged by the rectangle groove；
The pressure head is for applying the component of load in bending apparatus, and replaceable fixed dress is installed at the middle part of pressure head
It sets, fixed device can apply load to steel wire test, and steel wire is pulled to occur bending and deformation upward or downward respectively；The pressure head is
Cylindrical-shaped structure, axis is perpendicular to the bottom surface of rectangle groove, and the lower part of pressure head is protruded into rectangle groove；The steel wire test
Level is fixed, and the center of steel wire is fixed in the fixed device, and two branch on test microscope carrier are protruded at the both ends of steel wire test
It supports in platform, two mantle fiber structures of setting limit sliding up and down for steel wire test in supporting table.
The test microscope carrier is cylindrical-shaped structure, is made of steel alloy, and the bottom center position of microscope carrier is equipped with internal thread hole,
Microscope carrier is connect by internal thread hole with load chain A, and load chain A is connected on the pedestal of fatigue tester.
The top of the pressure head sets external screw thread, and pressure head is connect by external screw thread with load chain B, loads chain B and fatigue test
The force snesor of machine is connected, and pressure head can move along the vertical direction under the action of fatigue tester loading force；The pressure head
Bottom end face is designed as arcuate structure.The load chain A and the load chain B pull rod that include multiple length different, each pull rod it
Between be connected by screw thread, length is adjustable.
The mantle fiber structure and the test microscope carrier are separate structure, mantle fiber structure be it is cylindric, be provided with along its axis
Threaded hole of steel, mantle fiber structure are being designed as concave curved surface 402 towards an end face of rectangle groove side.
It is provided with bearing groove on the inner sidewall of two supporting tables of the test microscope carrier, after mantle fiber structure is placed in bearing groove,
It is fixed by hold-down bolt from top.
It is respectively opened on the upper surface of each supporting table there are two the threaded hole being connected with bearing groove, hold-down bolt is threaded into
It is connected to behind hole in mantle fiber structure, further tightens bolt, realize fixation of the mantle fiber structure in bearing groove.
Kidney slot is provided in the middle part of the pressure head, fixed device is put in the kidney slot, and fixed device has different size,
Corresponding to various sizes of steel wire sample；The center of the fixed device is provided with loading hole, the curvature and steel wire sample of loading hole
Unanimously.
Rectangular straight slot is opened up on the fixed device along the vertical direction, the upper and lower surface of rectangular straight slot is respectively provided with a right angle
Triangular bump, two right angles of convex block end are oppositely arranged and form loading hole in the center of the fixed device.
The experimental method of the two-way alternating bending of steel wire in the test high and low temperature environment carried out using the experimental provision, including
Following steps:
(A) installation environment case and bending apparatus:
Environmental cabinet is first placed between fatigue tester crossbeam and work top, then bending apparatus is put into environmental cabinet chamber
Internal portion；Then the sensor and load chain link of pressure head and testing machine is good, then moving beam adjusts cylinder and transports up and down
Dynamic lab space；
(B) steel wire sample is installed, and specifically comprises the following steps (b1)-(b4):
(b1) the fixation device and mantle fiber with specified specification wire adapted are selected；
(b2) in the loading hole that steel wire sample levels are passed through to microscope carrier or so bearing groove and pressure head；
(b3) mantle fiber is installed into the bearing groove of microscope carrier two sides, mantle fiber position is adjusted, to ensure the bending gauge length L of sample0,
Then mantle fiber is fixed with housing pin；
(b4) install the fixation device in the middle part of pressure head: the loading hole at fixed device center will be fitted close with steel wire surface,
To guarantee contact circular arc area when applying load；The angle of fixing groove loading hole and side want centering to install, competence exertion school
It tests steel wire bent degree and prevents steel wire from lateral action occurs.
(C) implement load, specifically comprise the following steps (c1)-(c4):
(c1) testing machine current load is reset, shift value is biased to zero, is set as displacement control mode；(c2) it works out
Loading procedure selects displacement for control command, and setting load deflection value is ± D, and D value is equal to L0/2；Given loading speed, load
Rate is usually no more than 5mm/min, and gauge length can suitably advance the speed greatly, but be not easy too fast, it is ensured that experimentation can be steady
It carries out；Loaded contact analysis generally uses triangular wave；Fatigue tester can more easily be arranged the time, load, be displaced, follow simultaneously
The all inferior data acquisition conditions of ring, can finally obtain detailed experimentation and result data；
(c3) start fatigue tester, cylinder operation applies load to sample, and the central point in sample levels direction is being drawn
Under the action of power or pressure, steel wire is driven to do regular movement up and down with pressure head, steel wire central point moves to the upper of displacement
When lower peak-to-valley value, 90 degree of bendings upward or downward occur for steel wire, and loading action is run repeatedly alternatively up and down, until sample occurs
Damage or fracture, experiment stop；
(c4) steel wire motion state and steel wire surface deformed part can be observed by environmental cabinet observation window in experimentation
Whether position has local damage, can stop experiment at any time or protect trigger when steel wire fracture to order by requirement of experiment
It enables, it is automatic to terminate experiment, terminate loading procedure.
(D) experimental result is handled: after (d1) load stops, removal sample checks sample damage state, and confirmatory sample reaches
Satisfied load requirement, experimental result are effective；(d2) collected experimental data is arranged, 90 degree of the two-way alternating bending of steel wire is provided
Effective number of inversion because one cycle includes commutating twice, which is twice of circulating cycle time numerical value.
Design Mechanism of the present invention is as follows:
The present invention designs for test philosophy and the high and low temperature environment requirement of 90 degree of the two-way alternating bending of steel wire and is suitble to height
Loading method and loading device under the conditions of warm environmental experiment, realize high and low temperature environment in steel wire it is positive and negative it is two-way, alternately and repeatedly, it is curved
Bent 90 degree of test process simultaneously can obtain effective test result.
Loading method: loading method of the invention with existing to stir deformation method entirely different；In axially loaded fatigue
Environmental cabinet is equipped between testing machine crossbeam and table top, environmental cabinet can provide the high and low temperature environment of needs；It is filled inside environmental cabinet
With the steel wire bent frock clamp specially designed, steel wire sample levels are placed into toolholder central axis position；On sample axis
Central point chain link is loaded by the sensor in pressure head and fatigue machine vertical direction；Load chain between pressure head and crossbeam is high
Degree can be adjusted by moving beam；The cylinder of control fatigue machine pumps, and applies as load power to sample
Load lotus；Fatigue tester can apply drawing-compressive load, band by pressure head using the range ability for accurately controlling cylinder
Dynamic steel wire occur up and down reciprocatingly, two way alternate, the movement for being bent 90 degree, achieve the purpose that make steel wire that quantitatively bending deformation occur；
Meanwhile the program control of closed loop is realized on fatigue tester by the force snesor, displacement sensor and controller of load chain link
System, data relevant obtaining between load, displacement etc. are timely to circulation cycle in loading procedure, can provide for deformation process analysis
Beneficial reference.
Deformation principle: using the center position on steel wire sample length direction when the present invention tests, by loading chain
Pressure head applies stretching and compressive load respectively；Cylinder moves a certain distance in the stretching direction, makes 90 degree of steel wire bent, actuation
Cylinder reversely moves certain distance along compression direction again, makes 90 degree of steel wire back-flexing；So continuous iterative cycles movement, makes steel wire
In vertical plane, tension compression bidirectional alternate repetition occurs and is bent 90 degree of deformations, until off-test when steel wire is damaged or is broken.Position
The move distance for moving control is calculated according to the travel paths that steel wire deforms.The movement road of 90 degree of alternating bending of tension and compression above and below steel wire
Diameter is two triangles symmetrical above and below, and the common edge that two triangles are overlapped is exactly the initial position of steel wire installation, common edge
Side length be fixed as the gauge length L of steel wire0.When the shift value D of cylinder one-way movement reaches the half of gauge length, steel wire is just
90 degree of bending.
Bending apparatus: the present invention devises the deformation device for steel wire bent, which can adapt to quantitative tension and compression and add
It carries, realizes 90 degree of alternating bendings of steel wire stable and continuous.Apparatus structure is succinct, and size is small and exquisite, and experiment running space can limit
In environmental cabinet box house size allowed band, and sample installing and dismounting is easy to operate.
It advantages of the present invention and has the beneficial effect that:
1, different from the loading method of current standard methods (GB/T 238-2002), the present invention is made using fatigue tester
The axial push-pull loading method that dynamic cylinder moves back and forth, control steel wire bent deformation, realize steel wire double-deformation, alternately and repeatedly, it is curved
Bent 90 degree of performance test；
2, the present invention specially devises bending deformation device, which is suitable for using under the conditions of high and low temperature environment, device
Critical component can facilitate exchange according to the specification of steel wire sample；
3, the component mantle fiber in the bending deformation device that the present invention designs can adjust load gauge length, and mantle fiber and steel wire deform
Cambered surface is designed as on the inside of contact face；
4, in bending apparatus of the present invention, the fixed device of pressure head center portion be designed as it is split type, various sizes of fixed device its
The curvature of loading hole is identical as sample specification, and the side angle of loading hole upper and lower side is designed as 90 degree.
Detailed description of the invention
Fig. 1 is equipment therefor structural schematic diagram in existing metal material alternating bending test (GB/T 238-2002).
Fig. 2 is that bending apparatus structure is shown in the experimental provision of the two-way alternating bending of steel wire in present invention test high and low temperature environment
It is intended to (perspective view).
Fig. 3 is that bending apparatus structure is shown in the experimental provision of the two-way alternating bending of steel wire in present invention test high and low temperature environment
It is intended to (profilograph).
Fig. 4 is stage structure schematic diagram in bending apparatus of the present invention.
Fig. 5 is pressure head structure schematic diagram in bending apparatus of the present invention.
Fig. 6 is mantle fiber structural schematic diagram in bending apparatus of the present invention.
Fig. 7 is fixture structure schematic diagram in bending apparatus of the present invention.
In figure: 100- tests microscope carrier；101- rectangle groove；102- supporting table；103- bearing groove；104- internal thread hole；
200- pressure head；201- fixes device；202- kidney slot；203- loading hole；204- convex block；300- steel wire test；400- mantle fiber knot
Structure；401- threaded hole of steel；402- inner concave arc surface.
Specific embodiment
The present invention is described in detail below in conjunction with attached drawing.
The present invention is to test the experimental provision and experimental method of the two-way alternating bending of steel wire in high and low temperature environment, the experiment
The overall structure of device is as Figure 2-3.The experimental provision includes axial fatigue machine, high-low-temperature environmental testing case and bending
Device；The high-low-temperature environmental testing case is set between the crossbeam of fatigue tester and workbench, is for experiment for mentioning
Temperature environment；The bending apparatus is set in high-low-temperature environmental testing case.Wherein, axial fatigue machine is U.S.'s Instron
Fatigue machine, model: INSTRON8852.
The bending apparatus includes testing microscope carrier 100 and pressure head 200, and diametrically position adds on the test microscope carrier upper surface
Work has rectangle groove 101；The top of the test microscope carrier is separated out two supporting tables being oppositely arranged by the rectangle groove
102；The pressure head is for applying the component of load in bending apparatus, and replaceable fixation device 201 is installed at the middle part of pressure head,
Fixed device can apply load to steel wire test 300, and steel wire is pulled to occur bending and deformation upward or downward respectively；The pressure head is
The bottom end face of cylindrical-shaped structure, pressure head is designed as arcuate structure.Bottom surface of its axis perpendicular to rectangle groove 101, and pressure head
Lower part protrude into rectangle groove；The steel wire test level is fixed, and the center of steel wire is fixed in the fixed device 201,
The both ends of steel wire test are protruded into two supporting tables 102 on test microscope carrier, and two mantle fiber structures 400 of setting limit in supporting table
Steel wire test slides up and down.The difficult point of metal alternating bending is two way alternate to be realized, bending, continuous to deform, core
It is to realize from upper and lower both direction while apply load, could commutates steady.The pressure head center portion installs replaceable fixing groove,
Its is compact-sized, and gap is adjustable, can apply load from steel wire upper and lower surface, steel wire is pulled to occur respectively to upper and lower both direction
Bending deformation.The curved head of pressure head lower end is to aim at the reserved design of compression of metals, and single compressive deformation is relatively simple mistake
Journey, this covering device can also be used to carry out the quantitative test of compression of metals.
The test microscope carrier 100 is cylindrical-shaped structure, is made of steel alloy, as shown in Figure 4.The microscope carrier made by steel alloy
For the critical component for carrying bending deformation, small in size, rigidity is big, and bearing capacity is strong.The bottom center position of microscope carrier is equipped with interior
Threaded hole 104, microscope carrier are connect by internal thread hole with load chain A, and load chain A is connected on the pedestal of fatigue tester.
The top of the pressure head sets external screw thread, and pressure head is connect by external screw thread with load chain B, loads chain B and fatigue test
The force snesor of machine is connected, and pressure head can move along the vertical direction under the action of fatigue tester loading force；The load chain A
With the load chain B pull rod that include multiple length different, it is connected between each pull rod by screw thread, load chain A and load chain B long
Spend it is adjustable, to guarantee that the sample in microscope carrier is in the uniform temperature zone of environmental cabinet.
Bearing groove 103, the upper surface of each supporting table 102 are provided on the inner sidewall of two supporting tables of the test microscope carrier
On respectively open there are two the threaded hole that is connected with bearing groove, the mantle fiber structure 400 is tied with the test microscope carrier 100 to be seperated
Structure, as shown in fig. 6, mantle fiber structure be it is cylindric, after mantle fiber structure 400 is placed in bearing groove 103, hold-down bolt is threaded into hole
After be connected in mantle fiber structure, further tighten bolt, realize fixation of the mantle fiber structure in bearing groove.The mantle fiber structure
400 are provided with threaded hole of steel 401 along its axis, and mantle fiber structure is being designed as concave curved surface towards an end face of rectangle groove side
402.Mantle fiber structure is devised in the bearing groove at left and right sides of microscope carrier, which may be implemented continuously adjusting for gauge length, and prevent
The only left and right play of steel wire.One side end face inner surface of mantle fiber is made as concave curved surface, it is therefore an objective to for increasing and steel wire
Contact surface avoids steel wire surface from being damaged to mitigate contact stress.
Kidney slot 202 is provided in the middle part of the pressure head, fixed device 201 is put in the kidney slot 202, as shown in Figure 5.
Fixed device has different size, is convenient for changing, and corresponds to various sizes of steel wire sample；As shown in fig. 7, the fixed device
Rectangular straight slot is opened up on 201 along the vertical direction, the upper and lower surface of rectangular straight slot is respectively provided with a right angled triangle convex block, convex block two
A right angle end is oppositely arranged and forms loading hole 203, the curvature and steel wire of loading hole 203 in the center of the fixed device
Sample is consistent, it is therefore an objective to which the state for keeping steel wire loaded is similar to the stress of room temperature routine test, and contacts surface damage
It is minimum.The design of right angled triangle convex block above and below loading hole makes the side angle of loading hole upper and lower side be designed as 90 degree, inclined-plane
Designed for preventing steel wire generation from swinging in the front-back direction, while it can observe and verify an angle of 90 degrees.
The test of the two-way alternating bending of steel wire in high and low temperature environment is carried out using above-mentioned apparatus, test process includes following step
It is rapid:
(A) installation environment case and bending apparatus:
Environmental cabinet is first placed between fatigue tester crossbeam and work top, then bending apparatus is put into environmental cabinet chamber
Internal portion；Then the sensor and load chain link of pressure head and testing machine is good, then moving beam adjusts cylinder and transports up and down
Dynamic lab space；
(B) steel wire sample is installed, and specifically comprises the following steps (b1)-(b4):
(b1) the fixation device and mantle fiber with specified specification wire adapted are selected；
(b2) in the loading hole that steel wire sample levels are passed through to microscope carrier or so bearing groove and pressure head；
(b3) mantle fiber is installed into the bearing groove of microscope carrier two sides, mantle fiber position is adjusted, to ensure the bending gauge length L of sample0,
Then mantle fiber is fixed with housing pin；
(b4) install the fixation device in the middle part of pressure head: the loading hole at fixed device center will be fitted close with steel wire surface,
To guarantee contact circular arc area when applying load；The angle of fixing groove loading hole and side want centering to install, competence exertion school
It tests steel wire bent degree and prevents steel wire from lateral action occurs.
(C) implement load, specifically comprise the following steps (c1)-(c4):
(c1) testing machine current load is reset, shift value is biased to zero, is set as displacement control mode；(c2) it works out
Loading procedure selects displacement for control command, and setting load deflection value is ± D, and D value is equal to L0/2；Given loading speed, load
Rate is usually no more than 5mm/min, and gauge length can suitably advance the speed greatly, but be not easy too fast, it is ensured that experimentation can be steady
It carries out；Loaded contact analysis generally uses triangular wave；Fatigue tester can more easily be arranged the time, load, be displaced, follow simultaneously
The all inferior data acquisition conditions of ring, can finally obtain detailed experimentation and result data；
(c3) start fatigue tester, cylinder operation applies load to sample, and the central point in sample levels direction is being drawn
Under the action of power or pressure, steel wire is driven to do regular movement up and down with pressure head, steel wire central point moves to the upper of displacement
When lower peak-to-valley value, 90 degree of bendings upward or downward occur for steel wire, and loading action is run repeatedly alternatively up and down, until sample occurs
Damage or fracture, experiment stop；
(c4) steel wire motion state and steel wire surface deformed part can be observed by environmental cabinet observation window in experimentation
Whether position has local damage, can stop experiment at any time or protect trigger when steel wire fracture to order by requirement of experiment
It enables, it is automatic to terminate experiment, terminate loading procedure.
(D) experimental result is handled:
(d1) after load stops, removal sample checks sample damage state, and confirmatory sample reaches satisfied load requirement,
Experimental result is effective；(d2) collected experimental data is arranged, effective number of inversion of 90 degree of the two-way alternating bending of steel wire is provided,
Because one cycle includes commutating twice, which is twice of circulating cycle time numerical value.It can also further analyze
Load, displacement with circulation cycle it is timely between changing rule.
The design advantage of the program: (1) loading method for generating bending deformation using tension and compression campaign is novel, fatigue tester
Bit andits control it is accurate, closed loop program control keep experimental implementation convenient, the experimental data of acquisition is full and accurate；(2) loading device
It is simple for structure, it is small in size, it is suitble to limited lab space, is readily placed at narrow environmental cabinet inside cavity, is able to achieve height
The performance test of warm environment；(3) loading structure considers the cooperation of different size sample, devises the crucial portion convenient for exchanging
Part can be completed the bending property test of plurality of specifications steel wire, be applied and compared just in engineering by the replacement of small size parts
Benefit.
Claims (10)
1. the experimental provision of the two-way alternating bending of steel wire in a kind of test high and low temperature environment, it is characterised in that: the experimental provision packet
Include axial fatigue machine, high-low-temperature environmental testing case and bending apparatus；The high-low-temperature environmental testing case is set to tired examination
It tests between the crossbeam of machine and workbench, for proposing the temperature environment that is for experiment；The bending apparatus is tried set on high and low temperature environment
In tryoff；Wherein:
The bending apparatus includes testing microscope carrier and pressure head, and diametrically position is machined with rectangle ditch on the test microscope carrier upper surface
Slot；The top of the test microscope carrier is separated out two supporting tables being oppositely arranged by the rectangle groove；
The pressure head is for applying the component of load in bending apparatus, and replaceable fixation device is installed at the middle part of pressure head, Gu
Load can be applied to steel wire test by determining device, and steel wire is pulled to occur bending and deformation upward or downward respectively；The pressure head is cylinder
Shape structure, axis is perpendicular to the bottom surface of rectangle groove, and the lower part of pressure head is protruded into rectangle groove；The steel wire test is horizontal
Fixed, the center of steel wire is fixed in the fixed device, and two supporting tables on test microscope carrier are protruded at the both ends of steel wire test
Interior, two mantle fiber structures of setting limit sliding up and down for steel wire test in supporting table.
2. the experimental provision of the two-way alternating bending of steel wire, feature exist in test high and low temperature environment according to claim 1
In: the test microscope carrier is cylindrical-shaped structure, is made of steel alloy, and the bottom center position of microscope carrier is equipped with internal thread hole, microscope carrier
It is connect by internal thread hole with load chain A, load chain A is connected on the pedestal of fatigue tester.
3. the experimental provision of the two-way alternating bending of steel wire, feature exist in test high and low temperature environment according to claim 2
In: the top of the pressure head sets external screw thread, and pressure head is connect by external screw thread with load chain B, loads the power of chain B and fatigue tester
Sensor is connected, and pressure head can move along the vertical direction under the action of fatigue tester loading force；The bottom end of the pressure head
Face is designed as arcuate structure；The load chain A and the load chain B pull rod that include multiple length different pass through between each pull rod
Screw thread is connected, and length is adjustable.
4. the experimental provision of the two-way alternating bending of steel wire, feature exist in test high and low temperature environment according to claim 1
In: the mantle fiber structure and the test microscope carrier be separate structure, mantle fiber structure be it is cylindric, be provided with steel wire along its axis
Hole, mantle fiber structure are being designed as concave curved surface towards an end face of rectangle groove side.
5. the experimental provision of the two-way alternating bending of steel wire, feature exist in test high and low temperature environment according to claim 4
In: it is provided with bearing groove on the inner sidewall of two supporting tables of the test microscope carrier, after mantle fiber structure is placed in bearing groove, by compressing
Bolt is fixed from top.
6. the experimental provision of the two-way alternating bending of steel wire, feature exist in test high and low temperature environment according to claim 5
In: the threaded hole being connected there are two respectively being opened on the upper surface of each supporting table with bearing groove, after hold-down bolt is threaded into hole
It is connected in mantle fiber structure, further tightens bolt, realize fixation of the mantle fiber structure in bearing groove.
7. the experimental provision of the two-way alternating bending of steel wire, feature exist in test high and low temperature environment according to claim 1
In: kidney slot is provided in the middle part of the pressure head, fixed device is put in the kidney slot, and fixed device has different size, corresponding
In various sizes of steel wire sample；The center of the fixed device is provided with loading hole, and the curvature of loading hole is consistent with steel wire sample.
8. the experimental provision of the two-way alternating bending of steel wire, feature exist in test high and low temperature environment according to claim 4
In: rectangular straight slot is opened up on the fixed device along the vertical direction, the upper and lower surface of rectangular straight slot is respectively provided with a right angle trigonometry
Shape convex block, two right angles of convex block end are oppositely arranged and form loading hole in the center of the fixed device.
9. the two-way alternating bending of steel wire in the test high and low temperature environment carried out using any experimental provision of claim 1-8
Experimental method, it is characterised in that: the experimental method includes the following steps:
(A) installation environment case and bending apparatus:
Environmental cabinet is first placed between fatigue tester crossbeam and work top, then bending apparatus is put into environmental cabinet cavity
Portion；Then the sensor and load chain B of pressure head and testing machine are connected, then moving beam adjusts cylinder up and down motion
Lab space；
(B) steel wire sample is installed:
(C) implement load, specifically comprise the following steps (c1)-(c4):
(c1) testing machine current load is reset, shift value is biased to zero, is set as displacement control mode；(c2) establishment load
Program selects displacement for control command, and setting load deflection value is ± D, and D value is equal to L0/2；Given loading speed, loading speed
It is usually no more than 5mm/min, gauge length can suitably advance the speed greatly, but be not easy too fast, it is ensured that experimentation can be carried out steadily；
Loaded contact analysis generally uses triangular wave；Time, load, displacement, circulating cycle can be more easily arranged in fatigue tester simultaneously
Inferior data acquisition conditions can finally obtain detailed experimentation and result data；
(c3) start fatigue tester, cylinder operation gives sample to apply load, the central point in sample levels direction in pulling force or
Under the action of pressure, steel wire is driven to do regular movement up and down with pressure head, steel wire central point moves to the peak up and down of displacement
When valley, 90 degree of bendings upward or downward occur for steel wire, and loading action is run repeatedly alternatively up and down, until sample damages
Or fracture, experiment stop；
(c4) it can observe steel wire motion state by environmental cabinet observation window in experimentation and steel wire surface bending deformation position is
It is no to have local damage, experiment can be stopped at any time or when steel wire fracture by trigger guarded command by requirement of experiment, from
It is dynamic to terminate experiment, terminate loading procedure.
(D) experimental result is handled: after (d1) load stops, removal sample checks sample damage state, and confirmatory sample reaches satisfied
Load requirement, experimental result is effective；(d2) collected experimental data is arranged, having for 90 degree of the two-way alternating bending of steel wire is provided
Number of inversion is imitated, because one cycle includes commutating twice, which is twice of circulating cycle time numerical value.
10. the experimental method of the two-way alternating bending of steel wire, feature exist in test high and low temperature environment according to claim 9
In: the process of installation steel wire test specifically comprises the following steps (b1)-(b4) in step (B):
(b1) the fixation device and mantle fiber with specified specification wire adapted are selected；
(b2) in the loading hole that steel wire sample levels are passed through to microscope carrier or so bearing groove and pressure head；
(b3) mantle fiber is installed into the bearing groove of microscope carrier two sides, mantle fiber position is adjusted, to ensure the bending gauge length L of sample0, then
Mantle fiber is fixed with housing pin；
(b4) install the fixation device in the middle part of pressure head: the loading hole at fixed device center will be fitted close with steel wire surface, to protect
Card applies contact circular arc area when load.
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