CN105758740A - In-situ tester for mechanical property of small-size torsional fatigue material with controllable magnetic field intensity - Google Patents
In-situ tester for mechanical property of small-size torsional fatigue material with controllable magnetic field intensity Download PDFInfo
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- CN105758740A CN105758740A CN201610208878.3A CN201610208878A CN105758740A CN 105758740 A CN105758740 A CN 105758740A CN 201610208878 A CN201610208878 A CN 201610208878A CN 105758740 A CN105758740 A CN 105758740A
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H21/00—Gearings comprising primarily only links or levers, with or without slides
- F16H21/10—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane
- F16H21/40—Gearings comprising primarily only links or levers, with or without slides all movement being in, or parallel to, a single plane for interconverting rotary motion and oscillating motion
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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
- 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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Abstract
The invention relates to an in-situ tester for a mechanical property of a small-size torsional fatigue material with controllable magnetic field intensity and belongs to the field of a precise scientific instrument. The in-situ tester mainly consists of a precise driving unit, a driving unit, a clamping unit, a magnetic field loading unit, a detection unit and a supporting unit, wherein a motor of the precise driving unit is used for driving a rotating end of the clamping unit to rotate back and forth at a fixed angle through a speed reducer and a crank and rocker mechanism in the driving unit, so as to realize the torsional fatigue loading; the adjustment for the torsional fatigue reciprocating deflecting angle can be realized by changing the lengths of the crank, connecting rod and rocker in the crank and rocker mechanism; the adjustment for magnetic field intensity can be realized by changing the distance of the pole head and the magnetic field loading unit. The tester wholly has a horizontal structure, is simple and compact, is compatible with optical microscope and can be used for in-situ real-time observing the sample. A reliable test method is supplied for disclosing a mechanical property and fatigue damage system of the material under different magnetic field intensities.
Description
Technical field
The present invention relates to precision scientific instrument field, in-situ mechanical field tests, particularly to the small-sized torsional fatigue material mechanical property in-situ tester of a kind of controllable magnetic field intensity.Material can be carried out the testing torsional fatigue under different magnetic field intensity, different torsion angle, and integrated optics microscope sample can be carried out original position real-time monitored, provide a kind of means of testing reliably for disclosing material mechanical characteristic under different magnetic field intensity effect and Fatigue Damage Mechanism.
Background technology
The research of material and the purpose of synthesis are in that to meet the demand of human material's civilization, specific material have its specific performance be its have use value basic.And the object of study of Mechanics Performance Testing, namely it is the performance showed under external force for material, such as elasticity, rigidity, intensity, plasticity, hardness, impact flexibility, fatigue strength and fracture toughness etc..According to statistics, fatigue rupture accounts for 80% in whole disabling elements, has had a strong impact on personal safety and national economy, therefore material has been carried out fatigue study and has highly important meaning.
In recent years, utilize the micro imaging system in-situ testing techniques to Material mechanics test dynamic monitoring such as optical microscope, high depth-of-field microscope, ultramicroscope, the deformation damage of material under load effect is carried out real-time monitored, deeply disclosing the Micromechanics behavior of material, micromechanism of damage, research and development to materialogy serve impetus.
Material is frequently subjected to torsional fatigue load in real work, and such as truck drive shaft, machine tool chief axis, motor shaft etc., additionally motor shaft, electro spindle etc. are also in magnetic field when bearing torsional fatigue load.And currently for the testing torsional fatigue device of material, be mostly with driven by servomotor, controlling motor positive and inverse by input electrical signal realizes fatigue load loaded, and volume cannot realize greatly in-situ observation, and could not realize the loading in magnetic field.Therefore develop the small-sized torsional fatigue material mechanical property in-situ test instrunment of a kind of controllable magnetic field intensity, Micromechanics characteristic and Fatigue Damage Mechanism when research material bears torsional fatigue load under different magnetic field intensity effect are significant.
Summary of the invention
It is an object of the invention to provide the small-sized torsional fatigue material mechanical property in-situ tester of a kind of controllable magnetic field intensity, solve the problems referred to above that prior art exists.The present invention utilizes crank rocker principle motor unidirectional rotary to be converted to fixture with fixed angles angle value crankmotion, the size of this fixed angle is adjusted by changing crank, connecting rod and rocking bar bar length in crank and rocker mechanism, the size loading magnetic field intensity is adjusted by changing magnetic pole cartridge distance, the size of moment of torsion measured by the torque sensor connected by fixing end fixture, reciprocating rotary angle and tired cycle is measured, thus realizing during motor not commutation work the torsional fatigue test of material under different magnetic field strength condition by the encoder that is connected with round end fixture.The deformation damage of material in loading procedure, microstructure change and performance development are carried out original position dynamic monitoring in combinations with optical microscope by the present invention, and then material mechanical characteristic under different magnetic field intensity effect and Fatigue Damage Mechanism are furtherd investigate.
The above-mentioned purpose of the present invention is achieved through the following technical solutions:
The small-sized torsional fatigue material mechanical property in-situ tester of controllable magnetic field intensity, overall employing horizontal type structure, simply compact, the mechanical characteristic that material torsional fatigue under different magnetic field intensity effect represents, microstructure morphology, fracture crack can be carried out original position real-time monitored.Including precision actuation unit, gear unit, grip unit, magnetic field loading unit, detection unit；Described precision actuation unit is fixed on base 20 side by electric machine support 4, comprises motor encoder 1, disc type electric machine 2, decelerator 3, and motor encoder 1, decelerator 3 are connected with disc type electric machine 2 respectively, provides power for complete machine instrument；Described gear unit is connected with precision actuation unit by motor coupler 5, bearing 23 be fixed on base 20, with disc type electric machine 2 homonymy；Described grip unit is divided into fixing end clamping device and round end clamping device two parts, and is fixed on the both sides of base 20 respectively through clamp mount II 15, clamp mount I 21；Described magnetic field loading unit is fixed by screws in base 20 middle；Described detection unit comprises encoder 6 and torque sensor 17, and encoder 6 is fixed on bearing 23 side, the side that torque sensor 17 is fixed on base 20 away from disc type electric machine 2 by sensor support base 18 by bracing frame 7.
Described gear unit includes power transmission shaft 22, disk I 8, disk II 9 and bearing pin I, II 25,26, described power transmission shaft 22 is installed on bearing 23 by pair of bearings I 24, power transmission shaft 22 is connected with disk I 8 by bearing pin I 25, disk I 8 is connected with disk II 9 by pin shaft II 26, constitutes crank and rocker mechanism；Described disk II 9 is axially positioned on round end fixture 10 by axle sleeve I 28 and the jump ring of its both sides, and is connected to transmit moment of torsion with round end fixture 10 by key；The complete cycle gyration that motor coupler 5 is transmitted by described gear unit, is converted to disk II 9 and end fixture 10 is rotated along its axis with fixed angle reciprocating rotary, thus the loading of torsional fatigue load when realizing motor Unidirectional.
Described power transmission shaft 22, disk I 8, disk II 9 are provided with uniform pin shaft hole, complete the adjustment of crank, connecting rod and rocking bar bar length in crank and rocker mechanism by the mounting hole site of adjustment bearing pin I 25, pin shaft II 26, thus changing the reciprocal deflection angle size of round end fixture, it is achieved the adjustment of the reciprocal deflection angle of torsional fatigue.
Described round end clamping device is made up of round end fixture 10 and pressing plate I 11, and pressing plate I 11 is connected with round end fixture 10 and compresses sample by screw, and both of which is provided with groove to clamp sample 32；Described round end fixture 10 is installed on clamp mount I 21 by bearing II 27, round end fixture 10 is provided with the shaft shoulder and jump-ring slot, makes bearing II 30 be positioned by card spring pressing disk II 9, axle sleeve I 28.
Described fixing end clamping device is by fixing end fixture 14 and pressing plate II 13 forms, and pressing plate II 13 holds fixture 14 to be connected and compress sample by screw with fixing, and both of which is provided with groove to clamp sample 32；Described fixing end fixture 14 is installed on clamp mount II 15 by bearing III 31, and on fixing end fixture 10, processing has the shaft shoulder, compresses shaft sleeve II 30 by connection axle 16 and makes bearing III 31 be positioned.
Described magnetic field loading unit is made up of a pair magnetic pole cartridge 12 and magnet support 19, and two magnetic pole cartridges 12 are symmetrically arranged in sample 32 both sides, and are fixed on base 20 by magnet support 19, it is achieved complete machine magnetic field loads；Change the spacing of two magnetic pole cartridges simultaneously by adjusting the thickness of the pad installed between magnetic pole cartridge and magnet support, complete the adjustment of magnetic field intensity residing for sample, it is achieved the test under different magnetic field intensity effect.
Described detection unit is made up of encoder 6 and torque sensor 17, and wherein encoder 6 is connected with round end fixture 10 by encoder coupler 29, it is achieved the measurement to the reciprocal deflection angle size of round end fixture and tired cycle；Torque sensor 17 is connected by screw with being connected axle 16, thus realizing being passed to the measurement connecting axle 16 torque by key by fixing end fixture 14.
The size of main body of the small-sized torsional fatigue material mechanical property in-situ tester of described controllable magnetic field intensity is 296mm × 80mm × 60mm, good with optical microscope compatibility.
The beneficial effects of the present invention is: compact integral structure, good with optical microscope compatibility, real-time monitored can bear the change of the microscopic appearance of material, organizational structure etc. during torsional fatigue under different magnetic field intensity effect.It is different from traditional torsional fatigue Mechanics Performance Testing device, it is capable of the fatigue test that motor unidirectional rotary drives sample back and forth to reverse with fixing corner, and in combinations with optical microscope, the torsional fatigue test of material under different magnetic field intensity effect is carried out original position real-time monitored.In driving, utilize three disks connected by two bearing pins to constitute typical crank and rocker mechanism, reach the purpose that under motor not commutation work, torsional fatigue load loads, bearing pin installation site can be changed to change rocking bar reciprocally swinging angle simultaneously.In applying magnetic field, this instrument adopts the adjustable bipolar hair style Magnet of cartridge spacing, and magnetic field intensity regulable control is simple.In overall structure, this apparatus structure is compact, it is possible to sample is monitored by integrated optics microscope in real time, it is achieved to the change of Fine Texture of Material pattern, lattice variations, cracks can spread original position dynamically observe.In sum, the present invention has good application, DEVELOPMENT PROSPECT, the development important in inhibiting to material in situ Micro Mechanical Properties measuring technology.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, and the illustrative example of the present invention and explanation thereof are used for explaining the present invention, are not intended that inappropriate limitation of the present invention.
Fig. 1 is the overall structure schematic diagram of the present invention；
Fig. 2 is the subassembly schematic diagram of the gear unit of the present invention；
Fig. 3 is the stationary fixture subassembly schematic diagram of the present invention；
Partial schematic diagram installed by the sample that Fig. 4 is the present invention；
Fig. 5 is the main TV structure schematic diagram of the present invention；
Fig. 6 is the plan structure schematic diagram of the present invention；
Fig. 7 is the left view structural representation of the present invention；
The loading principle figure of Fig. 8 present invention；
The crank mechanism that Fig. 9 is the present invention adjusts schematic diagram.
In figure: 1, motor encoder；2, disc type electric machine；3, decelerator；4, electric machine support；5, motor coupler；6, encoder；7, bracing frame；8, disk I；9, disk II；10, round end fixture；11, pressing plate I；12, magnetic pole cartridge；13, pressing plate II；14, fixing end fixture；15, clamp mount II；16, axle is connected；17, torque sensor；18, sensor support base；19, magnet support；20, base；21, clamp mount I；22, power transmission shaft；23, bearing；24, bearing I；25, bearing pin I；26, pin shaft II；27, bearing II；28, axle sleeve I；29, encoder coupler；30, shaft sleeve II；31, bearing III；32, sample.
Detailed description of the invention
Detailed content and the detailed description of the invention thereof of the present invention is further illustrated below in conjunction with accompanying drawing.
Referring to shown in Fig. 1 to Fig. 7, the small-sized torsional fatigue material mechanical property in-situ tester of the controllable magnetic field intensity of the present invention includes precision actuation unit, gear unit, grip unit, magnetic field loading unit, detection unit, support unit；Described support unit is made up of base 20 and bearing, plays a supporting role for other parts of instrument；Described precision actuation unit is fixed on base 20 side by electric machine support 4, comprises motor encoder 1, disc type electric machine 2, decelerator 3, and motor encoder 1, decelerator 3 are connected with disc type electric machine 2 respectively, provides power for complete machine instrument；Described gear unit is connected with precision actuation unit by motor coupler 5, bearing 23 be fixed on base 20, with motor homonymy；Described grip unit is divided into fixing end clamping device and round end clamping device two parts, and is fixed on the both sides on base 20 by clamp mount II 15, clamp mount I 21 respectively；Described magnetic field loading unit is fixed by screws in base 20 middle；Described detection unit comprises encoder 6 and torque sensor 17, and encoder 6 is fixed on bearing 23 side by bracing frame 7, the side that torque sensor 17 is fixed on base 20 away from motor by sensor support base 18.Complete machine adopts horizontal type structure, simply compact, the mechanical characteristic that material torsional fatigue under different magnetic field intensity effect represents, microstructure morphology, fracture crack can be carried out original position real-time monitored.
Shown in Fig. 1 and Fig. 2, described gear unit is mainly made up of power transmission shaft 22, disk I 8, disk II 9 and bearing pin 25,26；Wherein power transmission shaft 22 is installed on bearing 23 by pair of bearings I 24, its thin axle head is connected with precision actuation unit output shaft by motor coupler, its disk end is connected by bearing pin I 25, II 26 with disk II 9 respectively with disk I 8, disk I 8, constitutes crank and rocker mechanism；Disk II 9 both sides axially position at round end fixture 10 respectively through axle sleeve I 28 and jump ring, and are connected to transmit moment of torsion with round end fixture 10 with key；In described gear unit, power transmission shaft 22 is complete cycle revolution under the torque drive that motor coupler 5 transmits, disk II 9, fixture 10 reciprocating rotary is driven by playing the disk I 8 of connecting rod effect, the complete cycle gyration that motor coupler 5 is transmitted by namely described gear unit, be converted to disk II 9 and end fixture 10 be rotated with fixed angle along its axis reciprocating rotary, thus the loading of torsional fatigue load when realizing motor Unidirectional.
Shown in Fig. 1, Fig. 2 and Fig. 4, described round end clamping device is made up of round end fixture 10 and pressing plate I 11, screw connect and compress sample, and both of which processing is fluted to facilitate the clamping of sample 32；Described round end fixture 10 is installed on clamp mount I 21 by bearing II 27, and on round end fixture 10, processing has the shaft shoulder and jump-ring slot, makes bearing II 30 be positioned by card spring pressing disk II 9, axle sleeve I 28.
Shown in Fig. 1, Fig. 3 and Fig. 4, described fixing end clamping device by fix end fixture 14 and pressing plate 13 form, screw connect and compress sample, both of which processing fluted to facilitate the clamping of sample 32；Described fixing end fixture 14 is installed on clamp mount II 15 by bearing III 31, and on fixing end fixture 10, processing has the shaft shoulder, compresses shaft sleeve II 30 by connection axle 16 and makes bearing III 31 be positioned.
Shown in Fig. 1, Fig. 2 and Fig. 3, described detection unit is made up of encoder 6 and torque sensor 17；Wherein encoder 6 is fixed by screws on bracing frame 7, and bracing frame 7 is fixed by screws on bearing 23, and encoder 6 is connected with round end fixture 10 by encoder coupler 29；During torsional fatigue test, round end fixture 10 is rotated through encoder coupler 29 and drives encoder 6 power shaft to rotate, it is achieved the measurement to the reciprocal deflection angle size of round end fixture and tired cycle.Torque sensor 17 is fixed on sensor support base 18, and is connected by screw with being connected axle 16, and connects axle 16 and be connected by key with fixing end fixture 14；During torsional fatigue test, fixing end fixture 14 delivers torque to torque sensor 17 by connecting axle 16, it is achieved the measurement of torque in test.
Shown in Fig. 1, Fig. 4 and Fig. 8, described magnetic field loading unit is made up of a pair magnetic pole cartridge 12 and magnet support 19, and two magnetic pole cartridges 12 are symmetrically arranged in torsional specimen 32 both sides, it is achieved complete machine magnetic field loads；Change the spacing d of two magnetic pole cartridges simultaneously by adjusting the thickness installing pad between magnetic pole cartridge and magnet support, complete the adjustment of magnetic field intensity residing for sample, it is achieved the test under different magnetic field intensity effect.
Shown in Fig. 2 and Fig. 9, described power transmission shaft 22, disk I 8, disk II 9 are equipped with uniform pin shaft hole, complete the adjustment of crank, connecting rod and rocking bar bar length in crank and rocker mechanism by the mounting hole site of adjustment bearing pin I, pin shaft II, thus changing the reciprocal deflection angle size of round end fixture, it is achieved the adjustment of the reciprocal deflection angle of torsional fatigue.When the pin shaft hole selecting diverse location connects power transmission shaft 22, disk I 8, disk II 9, crank in crank and rocker mechanism, connecting rodAnd rocking barIt is adjusted to respectively、、, it is achieved the adjustment of each bar bar length, thus changing the reciprocal deflection angle size of round end fixture, complete the adjustment of the reciprocal deflection angle of torsional fatigue.
Shown in Fig. 1, Fig. 5, Fig. 6 and Fig. 7, described test instrunment compact integral structure, size of main body is 296mm × 80mm × 60mm, good with optical microscope compatibility, real-time monitored can bear the change of the microscopic appearance of material, organizational structure etc. during torsional fatigue load under different magnetic field intensity effect.
The present invention can carry out the mechanical test that under the action of a magnetic field, torsional fatigue load loads, except sample microscopic appearance in obtaining torque-torsional angle curve under different magnetic field intensity effect, torsional fatigue curve and testing, material shear modulus G, the sample testing fatigue notch sensitivity to prefabricated breach can also be obtained according to obtaining torque-torsional angle curve linear stageDetections etc., relevant pass formula is as follows
Shear modulus G
Wherein,For torque increase,For torsional angle increment,For gauge length,For specimen finish；
Mean stress
Stress amplitude
Stress ratio r
WhereinFor maximum stress,For minimum stress；
Fatigue notch sensitivity
WhereinFor theoretical stress concentration factor,For fatigue notch factor.
Shown in Fig. 1 to 4 and Fig. 8, the specific works process of the present invention is as follows:
During on-test, the disc type electric machine 2 obtaining input electrical signal drives power transmission shaft 22 to rotate through the torsion of decelerator 3 reduction of speed by motor coupler 5, drive disk II 9 along disk II 9 axle with fixed angles angle value reciprocating rotary based on crank rocker principle power transmission shaft 22 by disk I 8, disk II 9 is rotated on end fixture 10 and fixture torsional specimen 32 reciprocating rotary clamped, and torsional specimen 32 clamps through fixing end fixture 14, finally realize the loading of torsional fatigue load；Two cartridges 12 of magnetic field units are symmetrically arranged in torsional specimen 32 both sides, complete magnetic field and load, by increasing or reduce the spacing d change magnetic field intensity of two cartridges 12.Meanwhile, the thin encoded device shaft coupling 29 of axle head of round end fixture 10 drives encoder 6 power shaft to rotate, the collection of complete back-to-back test times of fatigue and the reciprocal angle value of single；Test torque is passed to torque sensor 17 by connecting axle 16 by fixing end fixture 14, completes the collection to test torque size.By changing two bearing pin mounting hole site between power transmission shaft 22, disk I 8, disk II 9, complete the adjustment of fatigue test sample reciprocating rotary angle value.Complete machine can be laid under an optical microscope, and before test, sample first corrodes through surface finish, can realize the in-situ observation of sample microstructure morphology in process of the test.
The foregoing is only the preferred embodiment of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.All any amendments made for the present invention, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (8)
1. the small-sized torsional fatigue material mechanical property in-situ tester of a controllable magnetic field intensity, it is characterised in that: overall employing horizontal type structure, including precision actuation unit, gear unit, grip unit, magnetic field loading unit, detection unit；Described precision actuation unit is fixed on base (20) side by electric machine support (4), comprise motor encoder (1), disc type electric machine (2), decelerator (3), motor encoder (1), decelerator (3) are connected with disc type electric machine (2) respectively, provide power for complete machine instrument；Described gear unit is connected with precision actuation unit by motor coupler (5), bearing (23) be fixed on base (20), with disc type electric machine (2) homonymy；Described grip unit is divided into fixing end clamping device and round end clamping device two parts, and is fixed on the both sides of base (20) respectively through clamp mount II (15), clamp mount I (21)；Described magnetic field loading unit is fixed by screws in base (20) middle；Described detection unit comprises encoder (6) and torque sensor (17), encoder (6) is fixed on bearing (23) side by bracing frame (7), the side that torque sensor (17) is fixed on base (20) away from disc type electric machine (2) by sensor support base (18).
2. the small-sized torsional fatigue material mechanical property in-situ tester of controllable magnetic field intensity according to claim 1, it is characterized in that: described gear unit includes power transmission shaft (22), disk I (8), disk II (9) and bearing pin I, II (25,26), described power transmission shaft (22) is installed on bearing (23) by pair of bearings I (24), power transmission shaft (22) is connected with disk I (8) by bearing pin I (25), disk I (8) is connected with disk II (9) by pin shaft II (26), constitutes crank and rocker mechanism；Described disk II (9) is axially positioned on round end fixture (10) by axle sleeve I (28) and the jump ring of its both sides, and is connected to transmit moment of torsion with round end fixture (10) by key；The complete cycle gyration that motor coupler (5) is transmitted by described gear unit, is converted to disk II (9) and end fixture (10) is rotated along its axis with fixed angle reciprocating rotary, thus the loading of torsional fatigue load when realizing motor Unidirectional.
3. the small-sized torsional fatigue material mechanical property in-situ tester of controllable magnetic field intensity according to claim 2, it is characterized in that: described power transmission shaft (22), disk I (8), disk II (9) are provided with uniform pin shaft hole, complete the adjustment of crank, connecting rod and rocking bar bar length in crank and rocker mechanism by the mounting hole site of adjustment bearing pin I (25), pin shaft II (26), thus changing the reciprocal deflection angle size of round end fixture, it is achieved the adjustment of the reciprocal deflection angle of torsional fatigue.
4. the small-sized torsional fatigue material mechanical property in-situ tester of controllable magnetic field intensity according to claim 1, it is characterized in that: described round end clamping device is made up of round end fixture (10) and pressing plate I (11), pressing plate I (11) is connected and compresses sample by screw with round end fixture (10), and both of which is provided with groove to clamp sample (32)；Described round end fixture (10) is installed on clamp mount I (21) by bearing II (27), and round end fixture is provided with the shaft shoulder and jump-ring slot on (10), makes bearing II (30) be positioned by card spring pressing disk II (9), axle sleeve I (28).
5. the small-sized torsional fatigue material mechanical property in-situ tester of controllable magnetic field intensity according to claim 1, it is characterized in that: described fixing end clamping device by fix end fixture (14) and pressing plate II (13) form, pressing plate II (13) is connected and compresses sample by screw with fixing end fixture (14), and both of which is provided with groove to clamp sample (32)；Described fixing end fixture (14) is installed on clamp mount II (15) by bearing III (31), and the upper processing of fixing end fixture (10) has the shaft shoulder, makes bearing III (31) be positioned by connecting axle (16) compression shaft sleeve II (30).
6. the small-sized torsional fatigue material mechanical property in-situ tester of controllable magnetic field intensity according to claim 1, it is characterized in that: described magnetic field loading unit is made up of a pair magnetic pole cartridge (12) and magnet support (19), two magnetic pole cartridges (12) are symmetrically arranged in sample (32) both sides, and it being fixed on base (20) by magnet support (19), it is achieved complete machine magnetic field loads；Change the spacing of two magnetic pole cartridges simultaneously by adjusting the thickness of the pad installed between magnetic pole cartridge and magnet support, complete the adjustment of magnetic field intensity residing for sample, it is achieved the test under different magnetic field intensity effect.
7. the small-sized torsional fatigue material mechanical property in-situ tester of controllable magnetic field intensity according to claim 1, it is characterized in that: described detection unit is made up of encoder (6) and torque sensor (17), wherein encoder (6) is connected with round end fixture (10) by encoder coupler (29), it is achieved the measurement to the reciprocal deflection angle size of round end fixture and tired cycle；Torque sensor (17) is connected by screw with being connected axle (16), thus realizing being passed to the measurement connecting axle (16) torque by key by fixing end fixture (14).
8. the small-sized torsional fatigue material mechanical property in-situ tester of controllable magnetic field intensity according to claim 1, it is characterized in that: the size of main body of the small-sized torsional fatigue material mechanical property in-situ tester of described controllable magnetic field intensity is 296mm × 80mm × 60mm, compatible with optical microscope.
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