CN107703006A - Stretching preloads lower dynamic torsional fatigue Mechanics Performance Testing device - Google Patents
Stretching preloads lower dynamic torsional fatigue Mechanics Performance Testing device Download PDFInfo
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- CN107703006A CN107703006A CN201711119547.3A CN201711119547A CN107703006A CN 107703006 A CN107703006 A CN 107703006A CN 201711119547 A CN201711119547 A CN 201711119547A CN 107703006 A CN107703006 A CN 107703006A
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- 238000012360 testing method Methods 0.000 title claims abstract description 51
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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
- G01N3/26—Investigating twisting or coiling properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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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
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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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
- G01N2203/0014—Type of force applied
- G01N2203/0026—Combination of several types of applied 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
- G01N2203/003—Generation of the force
- G01N2203/005—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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0423—Chucks, fixtures, jaws, holders or anvils using screws
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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Abstract
The present invention relates to one kind stretching to preload lower dynamic torsional fatigue Mechanics Performance Testing device, belongs to precision instrument technical field.Using horizontal arrangement, including draw unit, torsional fatigue unit, force signal and displacement signal detection unit, specimen holder unit, the draw unit is arranged in test specimen both sides with torsional fatigue unit, and with test specimen on the same axis；The draw unit, torsional fatigue unit, force signal and displacement signal detection unit and specimen holder unit are all on bottom plate；Magnetic field, thermal field loading are placed between draw unit and torsional fatigue unit, realize the coupling loading of force thermal.Advantage is：Measuring accuracy is higher, and structure is relatively simple, it is easy to accomplish.It can realize that stretching, torsional fatigue and stretching preload the Combined Loading of lower torsional fatigue；The coupling loading of power electric heating magnetic can be achieved；Can Real Time Observation material microstructure change such as Crack Extension when bearing torsional fatigue.
Description
Technical field
The present invention relates to the precision scientific instrument field in material Micro Mechanical Properties rests field, more particularly to a kind of stretching
Preload lower dynamic torsional fatigue Mechanics Performance Testing device.The instrument can integrate with light microscope and electric heating magnetic field to be made
With bearing stretching for research and preload the inefficacy mechanism, Crack Extension etc. of lower torsional fatigue material to provide effective ways.
Background technology
The development of material has significantly promoted the progress of society, but simultaneously with the development of science and technology the mankind are for material
The requirement more and more higher of material, use condition also more sophisticated.It is main at present although material science and technology develops rapidly
Research field concentrates on the exploitation and application of new material, for sign and the assessment technique slower development of material self-characteristic, energy
The Mechanics Performance Testing device of the actual service condition of real simulation material is very rare.Obviously, if filled using traditional test
The actual stress of some components can not be embodied completely by putting, so the mechanics parameter measured does not have absolute reference price yet
Value.
In addition, vehicle spindle, transmission shaft of machine tool etc. actually be on active service during bear be stretching, torsional fatigue even electricity
A series of reciprocation of combined loads such as pyromagnetic field, and these actual extraneous factors all can to material mechanical performance produce compared with
Big influence.Therefore, mechanics parameter is measured under foundation single load and carries out structure design it is difficult to ensure that the reliability of component.If
Can be in material mechanical performance test, exploitation one kind can be provided close to the true stressing conditions of material, true residing for simulation material
The mechanical testing instrument of real environment, mechanical property of the material under actual service condition just can be more accurately obtained, so as to more
Add and effectively avoid a series of major accidents caused by material failure.
The content of the invention
It is an object of the invention to provide one kind stretching to preload lower dynamic torsional fatigue Mechanics Performance Testing device, solves
Above mentioned problem existing for prior art.The invention has the characteristics that：（1）The single load of stretching, torsional fatigue can be realized
Lotus loads and stretched the Combined Loading for preloading lower torsional fatigue；（2）By double thick side set gear mechanisms, gear teeth is eliminated
The axial gap of bar transmission, ensure the symmetry of fatigue load loaded；（3）It can be realized with electric field, thermal field and magnetic coupling
The coupling loading of power electric heating magnetic；（4）It can be realized with the integrated use of light microscope to material in torsional fatigue load undertissue
The dynamic monitoring of the microscopic characteristics such as evolution, micromechanism of damage.Can be with the true service state of simulation material the invention provides one kind
Torsional fatigue experimental method, for disclose material failure micro-variations it is significant.
The above-mentioned purpose of the present invention is achieved through the following technical solutions：
Stretching preloads lower dynamic torsional fatigue Mechanics Performance Testing device, using horizontal arrangement, including draw unit, reverse it is tired
Labor unit, force signal and displacement signal detection unit, specimen holder unit, the draw unit and torsional fatigue unit difference cloth
Put in the both sides of test specimen 41, and with test specimen 41 on the same axis；The draw unit, torsional fatigue unit, force signal and displacement
Detecting signal unit and specimen holder unit are all installed on a base plate 2；Magnetic field, thermal field loading are placed in draw unit and torsion
Between tired unit, the coupling loading of force thermal is realized.
Described draw unit provides power using AC servomotor 1, by worm gear I, II 4,9, worm screw I, II 5,7
Leading screw 11 is driven to rotate after deceleration, the rotary motion of feed screw nut adjutant leading screw 11 is converted to the linear motion of nut 12, so as to
Realize the loading of tensile force；Wherein described AC servomotor 1 is fixed on a base plate 2 by motor support base 3, and worm screw I 5 connects
Onto the output shaft of AC servomotor 1；The worm gear I 4, worm screw II 7 are connected on axle I 6, and axle I 6 is fixed by shaft stool 8
On a base plate 2；The worm gear II 9 is connected on leading screw 11 by flat key, and leading screw 11 is connected to bottom plate 2 by leading screw bearing 10
On；The nut 12 is connected on nut bearing 13, and nut bearing 13 is connected to guide rail II, III by sliding block III, IV 39,40
38th, on 43, guide rail II, III 38,43 is connected in supporting plate 34 by soket head cap screw, and supporting plate 34 is fixed on a base plate 2.
Described torsional fatigue unit is used as driver using electromagnetic exciter 21, by gear 19, rack 22 by electromagnetic exciting
The linear reciprocating motion of device 21 is changed into the crankmotion of axle II 33, so as to realize the loading of torsional fatigue load；Wherein,
Described axle II 33 is connected on a base plate 2 by reversing shaft stool 18, and electromagnetic exciter 21 is fixed on a base plate 2, electromagnetic exciting
The mode that device 21 is connected through a screw thread is connected with rack 22；The rack 22 is connected to guide rail I 30 by slider I, II 23,28
On, guide rail I 30 is connected on adjustable height bottom plate 29, and adjustable height bottom plate 29 is embedded in bottom plate 2 by groove；The tooth
Wheel 19 is connected to by way of key connection on axle II 33.
Described force signal includes pulling force sensor 14, torque sensor 17, linear grating with displacement signal detection unit
Displacement transducer and encoder 20；Described one end of pulling force sensor 14 is threadedly attached on nut bearing 13, the other end
It is connected on clamp body bearing I 15；The torque sensor 17 is by way of flange connection, and one end is connected to axle II 33, separately
One end is connected on clamp body II 24；The linear grating displacement transducer includes grating scale 36 and reading head 37, the grating
Chi 36 is fixed on a base plate 2 by grating scale bearing 35, and reading head 37 is fixed on clamp body bearing I 15, passes through measured material
The displacement of body bearing I 15 measures the deflection of test specimen indirectly, and the encoder 20 is connected by encoder coupler 32 and axle II 33
Connect, realize the measurement of reciprocating rotary angle and tired cycle, wherein encoder 20 is connected on a base plate 2 by support 31.
Described specimen holder unit includes pressing plate I, II 25,26 and clamp body I, II 27,24, and the clamp body I 27 is logical
Cross and be threadedly coupled on clamp body bearing I 15, clamp body II 24 is connected on bottom plate 2 by clamp body bearing II 16；The folder
Specific I, II 27,24 are machined with profiling groove, realize the positioning of test specimen 42, and pressing plate I, II 25,26 passes through soket head cap screw respectively
It is connected on clamp body II, I 24,27, applies clamping force.
Described gear 19, rack 22 eliminate back lashes using double thick gear side set structures, ensure electromagnetic exciter 21
Output displacement be completely converted into the torsional displacement of test specimen 41；Wherein, bolt is passed through after double thick side set gear adjustment side set angles
42 lockings.Described adjustable height bottom plate 29 adjusts the radial clearance of rack and pinion engagement, and height formula is adjustable, and bottom plate 29 passes through
Four trapezoidal grooves are positioned, and the adjustment of height is carried out by the flat head screw of lower section four.
The beneficial effects of the present invention are：Measuring accuracy is higher, and structure is relatively simple, it is easy to accomplish.With other existing torsions
Turn Fatigue equipment to compare, the invention has the characteristics that and advantage：（1）It can realize that stretching, torsional fatigue and stretching preload
The Combined Loading of torsional fatigue under lotus；（2）With electric field, thermal field and magnetic coupling, the coupling loading of power electric heating magnetic can be realized；
（3）Use can be integrated with light microscope realize in-situ observation, Real Time Observation material Crack Extension when bearing torsional fatigue
Etc. microstructure change.In a word, the present invention bears to stretch for research preloads the inefficacy mechanism of lower dynamic torsional fatigue material, splits
Line extension etc. provides effective ways, has very strong practical value.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair
Bright illustrative example and its illustrate to be used to explain the present invention, do not form inappropriate limitation of the present invention.
Fig. 1 is the overall appearance structural representation of the present invention；
Fig. 2 is the torsional fatigue cellular construction schematic diagram of the present invention；
Fig. 3 is the draw unit structural representation of the present invention；
Fig. 4 is the specimen holder cellular construction schematic diagram of the present invention；
Fig. 5 is the gear rack anti-backlash structural representation of the present invention.
In figure：1st, AC servomotor；2nd, bottom plate；3rd, motor support base；4th, worm gear I；5th, worm screw I；6th, axle I；7th, worm screw
Ⅱ；8th, shaft stool；9th, worm gear II；10th, leading screw bearing；11st, leading screw；12nd, nut；13rd, nut bearing；14th, pulling force sensor；
15th, clamp body bearing I；16th, clamp body bearing II；17th, torque sensor；18th, shaft stool is reversed；19th, gear；20th, encoder；
21st, electromagnetic exciter；22nd, rack；23rd, slider I；24th, clamp body II；25th, pressing plate I；26th, pressing plate II；27th, clamp body I；28、
Sliding block II；29th, adjustable height bottom plate；30th, guide rail I；31st, support；32nd, encoder coupler；33rd, axle II；34th, supporting plate；
35th, grating scale bearing；36th, grating scale；37th, reading head；38th, guide rail II；39th, sliding block III；40th, sliding block IV；41st, test specimen；42nd, spiral shell
Bolt；43rd, guide rail III.
Embodiment
The detailed content and its embodiment of the present invention is further illustrated below in conjunction with the accompanying drawings.
Referring to shown in Fig. 1 to Fig. 5, stretching of the invention preloads lower dynamic torsional fatigue Mechanics Performance Testing device, adopts
With horizontal arrangement, including draw unit, torsional fatigue unit, force signal and displacement signal detection unit, specimen holder unit, institute
State draw unit and be arranged in the both sides of test specimen 42 with torsional fatigue unit, and with test specimen 42 on the same axis；The stretching
Unit, torsional fatigue unit, force signal and displacement signal detection unit and specimen holder unit are all installed on a base plate 2；
Larger space has been reserved in device central area, and magnetic field, thermal field loading can be placed between draw unit and torsional fatigue unit, realize
The coupling loading of force thermal；In-situ observation unit can be placed in directly over device.
Shown in Figure 3, described draw unit provides power using AC servomotor 1, by worm gear I, II 4,
9th, leading screw 11 is driven to rotate after worm screw I, II 5,7 is slowed down, the rotary motion of feed screw nut adjutant leading screw 11 is converted to nut 12
Linear motion, so as to realize the loading of tensile force；Wherein described AC servomotor 1 is fixed on bottom plate 2 by motor support base 3
On, worm screw I 5 is connected on the output shaft of AC servomotor 1；The worm gear I 4, worm screw II 7 are connected on axle I 6, and axle I 6 is logical
Shaft stool 8 is crossed to fix on a base plate 2；The worm gear II 9 is connected on leading screw 11 by flat key, and leading screw 11 passes through leading screw bearing 10
It is connected on bottom plate 2；The nut 12 is connected on nut bearing 13, and nut bearing 13 is connected to by sliding block III, IV 39,40
On guide rail II, III 38,43, guide rail II, III 38,43 is connected in supporting plate 34 by soket head cap screw, and supporting plate 34 is fixed on
On bottom plate 2.
Shown in Figure 2, described torsional fatigue unit is used as driver using electromagnetic exciter 21, by gear 19,
The linear reciprocating motion of electromagnetic exciter 21 is changed into the crankmotion of axle II 33 by rack 22, so as to realize torsional fatigue
The loading of load；Wherein, described axle II 33 is connected on a base plate 2 by reversing shaft stool 18, and electromagnetic exciter 21 is fixed on
On bottom plate 2, mode and rack 22 that electromagnetic exciter 21 is connected through a screw thread are connected；The rack 22 by slider I, II 23,
28 are connected on guide rail I 30, and guide rail I 30 is connected on adjustable height bottom plate 29, and adjustable height bottom plate 29 is embedding by groove
Enter in bottom plate 2；The gear 19 is connected to by way of key connection on axle II 33.
Referring to shown in Fig. 1 and Fig. 3, described force signal includes pulling force sensor 14 with displacement signal detection unit, turned round for institute
Square sensor 17, linear grating displacement transducer and encoder 20；Described one end of pulling force sensor 14 is threadedly attached to
On nut bearing 13, the other end is connected on clamp body bearing I 15；The torque sensor 17 flange connection by way of,
One end is connected to axle II 33, and the other end is connected on clamp body II 24；The linear grating displacement transducer includes grating scale 36
And reading head 37, the grating scale 36 are fixed on a base plate 2 by grating scale bearing 35, reading head 37 is fixed on clamp body bearing
On I 15, measure the deflection of test specimen indirectly by the displacement of measured material body bearing I 15, effectively prevent stretching force snesor
Test specimen displacement measurement errors caused by deformation；The encoder 20 is connected by encoder coupler with axle II 33, is realized reciprocal
The measurement of the anglec of rotation and tired cycle, wherein encoder 20 are connected on a base plate 2 by support 31.
Shown in Figure 4, described specimen holder unit includes pressing plate I, II 25,26 and clamp body I, II 27,24, described
Clamp body I 27 is threadedly attached on clamp body bearing I 15, and clamp body II 24 is connected to bottom plate by clamp body bearing II 16
On 2；The clamp body I, II 27,24 is machined with profiling groove, realizes the positioning of test specimen 42, and pressing plate I, II 25,26 passes through respectively
Soket head cap screw is connected on clamp body II, I 24,27, applies clamping force.
Shown in Figure 5, described gear 19, rack 22 eliminate back lashes using double thick gear side set structures, ensure
The output displacement of electromagnetic exciter 21 is completely converted into the torsional displacement of test specimen 41；Wherein, double thick side set gear adjustment side set angles
Pass through bolt after degree（42）Locking.Described adjustable height bottom plate 29 adjusts the radial clearance of rack and pinion engagement, height formula
Adjustable bottom plate 29 is positioned by four trapezoidal grooves, and the adjustment of height is carried out by the flat head screw of lower section four.
The stretching of the present invention preloads lower dynamic torsional fatigue Mechanics Performance Testing device, and larger sky has been reserved in central area
Between, it can be used with electric field, thermal field and magnetic coupling, the coupling loading of power electric heating magnetic be realized, so as to which real simulation material is real
The service state on border.Draw unit after two-stage worm and gear slows down and increases torsion, realizes tensile load using AC servo motor
Loading；Torsional fatigue unit, as driver, is driven through pinion and rack using electromagnetic exciter, realizes that torsional fatigue carries
The loading of lotus；Force signal uses force snesor, linear grating displacement transducer and photoelectric encoder with displacement signal detection unit
Carry out signal acquisition.This test device can realize tensile loads, and torsional fatigue loading, stretching preload lower dynamic torsional fatigue
Combined Loading.In addition, certain space has been reserved in device central area, it is possible to achieve the coupling loading and test of power heat, power magnetic.Dress
It is smaller to put overall structure, can be real with the integrated use of light microscope, the propagation behavior of real-time dynamic monitoring torsional fatigue crackle
Existing in-situ observation.The present apparatus realizes the coupling loading of stretching, torsional fatigue, and principle is reliable, and moment of torsion and windup-degree can be entered
The accurate measurement of row, while by the ingehious design of double thick gear side set structures, eliminate the drive gap of torsional fatigue loading, move
State property can be good, accurately can test and analyze the mechanical property and inefficacy mechanism of material under torsional fatigue, have wide application
Prospect.
Referring to shown in Fig. 1 to Fig. 5, the stretching of invention preloads lower dynamic torsional fatigue Mechanics Performance Testing device, is surveying
Before test instrument installation, it is necessary first to which pulling force sensor, torque sensor, grating linear displacement transducer and encoder are carried out
Demarcation and calibration, carrying out the installation and debugging of instrument afterwards.After each experiment terminates, it is necessary to which clamp body I, II is returned
Original position, to test the clamping of test specimen next time.
The stretching of the present invention preloads lower dynamic torsional fatigue Mechanics Performance Testing device, and its specific method of testing is such as
Under：
A. before each experiment starts, whether clamp body I, II is first checked in zero-bit, can utilize software records clamp body
Ith, the absolute position of II zero point, so that clamp body I, II can accurately return to zero point after testing every time, it is easy to test specimen
Clamping.
B. test specimen is put among the groove of lower clamp body I, II, clamped, and by pulling force sensor, torque sensor
All reset with the registration of grating linear displacement transducer.
C. carry out stretching after and preload parameter setting, tensile loads pattern of the invention can use power loading mode
Or speed loading mode, power loading mode i.e. by the real-time measurement of pulling force sensor come the size of feedback control loading force,
Speed loading mode is the size that feedback control loading velocity is carried out by the real-time measurement amount of grating linear displacement transducer.Root
Different loading modes can be selected according to different experiment demands.
D. stretching preloads applies torsional fatigue load after loading terminates to test specimen, according to different requirement of experiment, control
The excited frequency of electromagnetic exciter, so as to control the relevant parameter of torsional fatigue test；
E. if needing to carry out in-situ observation in experimentation, it is necessary to which the present invention is positioned under light microscope, test specimen also needs
Corrosion treatment is polished, so that dynamic observes the extension mechanism of material crackle under torsional fatigue in real time.
The present invention draws out material under different torsional frequencies by measuring the windup-degree of torsional fatigue and circulating cycle
S-N curves, moreover it is possible to according to the mechanics parameter such as shear modulus G for obtaining the torsional angle curve linear stage of moment of torsion one and obtaining material, tool
Body formula is as follows：
Shear modulusG=
Wherein,For torque increase,For rotating angle increment,For gauge length,For specimen finish；
Mean stress；
WhereinFor maximum stress,For minimum stress；
Stress amplitude：;
Stress ratio：;
The mechanical property of material is mainly manifested in the deformation and failure performance of material under load effect etc..The springform of material
The parameters such as amount, modulus of shearing, break limit, fatigue strength are most important test objects in material mechanical performance test.Pass through
Testing torsional fatigue can measure modulus of shearing, fatigue strength, a series of circulating cycle inferior indexs of material, so as to weigh material
Mechanical property when bearing torsional fatigue.In addition, research of the in-situ observation for Fatigue Crack Propagation Mechanism also has very big side
Help.
The preferred embodiment of the present invention is the foregoing is only, is not intended to limit the invention, for the technology of this area
For personnel, the present invention can have various modifications and variations.All any modification, equivalent substitution and improvements made for the present invention etc.,
It should be included in the scope of the protection.
Claims (6)
1. one kind stretching preloads lower dynamic torsional fatigue Mechanics Performance Testing device, it is characterised in that：Using horizontal arrangement, bag
Include draw unit, torsional fatigue unit, force signal and displacement signal detection unit, specimen holder unit, the draw unit with
Torsional fatigue unit is arranged in test specimen（41）Both sides, and and test specimen（41）On the same axis；The draw unit, torsion
Tired unit, force signal and displacement signal detection unit and specimen holder unit are all installed in bottom plate（2）On；Magnetic field, heat
Field loading is placed between draw unit and torsional fatigue unit, realizes the coupling loading of force thermal.
2. stretching according to claim 1 preloads lower dynamic torsional fatigue Mechanics Performance Testing device, it is characterised in that：
Described draw unit uses AC servomotor（1）Power is provided, by worm gear I, II（4、9）, worm screw I, II（5、7）Subtract
Leading screw is driven after speed（11）Rotation, feed screw nut adjutant's leading screw（11）Rotary motion be converted to nut（12）Linear motion,
So as to realize the loading of tensile force；Wherein described AC servomotor（1）Pass through motor support base（3）It is fixed on bottom plate（2）On,
Worm screw I（5）It is connected to AC servomotor（1）On output shaft；The worm gear I（4）, worm screw II（7）It is connected to axle I（6）On,
Axle I（6）Pass through shaft stool（8）It is fixed on bottom plate（2）On；The worm gear II（9）Leading screw is connected to by flat key（11）On, leading screw
（11）By leading screw bearing（10）It is connected to bottom plate（2）On；The nut（12）It is connected to nut bearing（13）On, nut bearing
（13）Pass through sliding block III, IV（39、40）It is connected to guide rail II, III（38、43）On, guide rail II, III（38、43）Pass through interior hexagonal spiral shell
Nail is connected to supporting plate（34）On, supporting plate（34）It is fixed on bottom plate（2）On.
3. stretching according to claim 1 preloads lower dynamic torsional fatigue Mechanics Performance Testing device, it is characterised in that：
Described torsional fatigue unit uses electromagnetic exciter（21）As driver, by gear（19）, rack（22）Electromagnetism is swashed
Shake device（21）Linear reciprocating motion be changed into axle II（33）Crankmotion, so as to realize torsional fatigue load plus
Carry；Wherein, the axle II（33）By reversing shaft stool（18）It is connected in bottom plate（2）On, electromagnetic exciter（21）Pass through screw thread
It is fastened on bottom plate（2）On, electromagnetic exciter（21）The mode and rack being connected through a screw thread（22）It is connected；The rack
（22）Pass through slider I, II（23、28）It is connected to guide rail I（30）On, guide rail I（30）It is connected to adjustable height bottom plate（29）On,
Adjustable height bottom plate（29）Bottom plate is embedded in by groove（2）In；The gear（19）Axle is connected to by way of key connection
Ⅱ（33）On.
4. stretching according to claim 1 preloads lower dynamic torsional fatigue Mechanics Performance Testing device, it is characterised in that：
Described force signal includes pulling force sensor with displacement signal detection unit（14）, torque sensor（17）, linear grating displacement
Sensor and encoder（20）；The pulling force sensor（14）One end is threadedly attached to nut bearing（13）On, it is another
End is connected to clamp body bearing I（15）On；The torque sensor（17）By way of flange connection, one end is connected to axle II
（33）, the other end is connected to clamp body II（24）On；The linear grating displacement transducer includes grating scale（36）And reading head
（37）, the grating scale（36）Pass through grating scale bearing（35）It is fixed on bottom plate（2）On, reading head（37）It is fixed on clamp body branch
Seat I（15）On, pass through measured material body bearing I（15）Displacement measure the deflection of test specimen indirectly；The encoder（20）It is logical
Cross encoder coupler（32）With axle II（33）Connection, realizes the measurement of reciprocating rotary angle and tired cycle, wherein encoding
Device（20）Pass through support（31）It is connected in bottom plate（2）On.
5. stretching according to claim 1 preloads lower dynamic torsional fatigue Mechanics Performance Testing device, it is characterised in that：
Described specimen holder unit includes pressing plate I, II（25、26）And clamp body I, II（27、24）, the clamp body I（27）Pass through
It is threadedly coupled to clamp body bearing I（15）On, clamp body II（24）Pass through clamp body bearing II（16）It is connected to bottom plate（2）On；
The clamp body I, II（27、24）Profiling groove is machined with, realizes test specimen（42）Positioning, pressing plate I, II（25、26）Lead to respectively
Cross soket head cap screw and be connected in clamp body II, I（24、27）On, apply clamping force.
6. stretching according to claim 3 preloads lower dynamic torsional fatigue Mechanics Performance Testing device, it is characterised in that：
Described gear（19）, rack（22）Back lash is eliminated using double thick gear side set structures, ensures electromagnetic exciter（21）'s
Output displacement is completely converted into test specimen（41）Torsional displacement；Described adjustable height bottom plate（29）Adjust rack and pinion engagement
Radial clearance, height formula is adjustable bottom plate（29）Positioned by four trapezoidal grooves, entered by the flat head screw of lower section four
The adjustment of row height.
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| CN201711119547.3A CN107703006A (en) | 2017-11-14 | 2017-11-14 | Stretching preloads lower dynamic torsional fatigue Mechanics Performance Testing device |
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