CN103389243A - Micro material mechanical performance testing platform under stretching-bending-twisting multi-loads - Google Patents

Micro material mechanical performance testing platform under stretching-bending-twisting multi-loads Download PDF

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Publication number
CN103389243A
CN103389243A CN2013103265334A CN201310326533A CN103389243A CN 103389243 A CN103389243 A CN 103389243A CN 2013103265334 A CN2013103265334 A CN 2013103265334A CN 201310326533 A CN201310326533 A CN 201310326533A CN 103389243 A CN103389243 A CN 103389243A
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fixture
module
load
bending
screw
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CN103389243B (en
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赵宏伟
杨柳青
孔祥飞
赵丹
吴鹏辉
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Jilin University
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Jilin University
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Abstract

The invention relates to a micro material mechanical performance testing platform under stretching-bending-twisting multi-loads, and belongs to the field of electromechanics. The micro material mechanical performance testing platform comprises a tension and compression module, a bending module, a twisting module, a detection control module and a test-piece clamping module, wherein the testing platform takes the tension and compression module as a basic function module; the twisting module is arranged at one end of the tension and compression module; the test-piece clamping module is arranged on the tension and compression module; the bending module is independently arranged at one side of a portal frame. The micro material mechanical performance testing platform can be taken as a material mechanical performance test device with an independent stretching/compressing mode or an independent bending mode or independent twisting mode, namely a single load testing mode, and can be applied to a material mechanical performance test of a twisting load under the given stretching/compressing stress level or a material mechanical performance test of a bending load under the given stretching/compressing stress level, namely a composite load testing mode. The stress strain process of a material under the effect of a composite load can be detected by the collection of a load/displacement signal by using the detection control module.

Description

The material Micro Mechanical Properties test platform under multi-load stretches-bending-reverses
 
Technical field
The present invention relates to dynamo-electric field, particularly the material Micro Mechanical Properties test platform under a kind of stretching-bending-torsion multi-load.The present invention can be used as independent stretching/compressing mode or independent beam mode or independent torsional type material Mechanics Performance Testing device, i.e. single load test pattern; Also can be used as at the material mechanical performance test of the torsional load under given stretching/compressing stress level or the material mechanical performance test of the bending load under given stretching/compressing stress level, i.e. combined load test pattern.By controlling the collection of detection module to load/displacement signal, but the ess-strain process of test material under Action of Combined Loads.The mode that applies of two kinds of combined loads provides new method for the research of Mechanical Properties of Materials.
Background technology
Traditional material mechanical performance method of testing is pulling method, compression method, torsional technique, bending method etc., is all to belong to the various mechanical property parameters of measuring material under the single load pattern.The various parameters of measuring are all the results under single load, and with actual application in the complex load that bears of part inconsistent, and then make result not have general cogency.And along with the development of modern science and technology, performance requirement to physical construction is more and more higher, physical construction is subject to the comprehensive mechanical property of Action of Combined Loads and is paid close attention to widely in actual condition, the mode that applies of its load and measuring method be continuous Change and Development also.
The material Micro Mechanical Properties test platform that stretches-crooked-reverse under multi-load refers to test specimen under two or more load, and the distortion that the material under load is occurred by external control detecting instrument, damage are until the process of failure damage is carried out a kind of mechanical test technology of dynamic monitoring.In Mechanics Performance Testing, the parameters such as tension/curved intensity, elastic modulus, shear modulus, yield limit twisting strength have been embodied a concentrated reflection of the combination property of material.The combined load test can disclose the deformation damage rule of material under the extraneous load of reality, with the single load test, compares, and can find new phenomenon and rule, more is conducive to the mechanical behavior of research material.
At present, the material Micro Mechanical Properties test platform that stretches-bending-reverse under multi-load is rarely found at home, the research observation method is still immature, is in particular in: 1, combined load applies synchronism in process and is difficult to guarantee, and needs the mutual coupling between various load.2, the control detecting instrument in test process such as all kinds sensor, scrambler, driver etc. can be subject to the impact of all the other load, and measuring accuracy is difficult to guarantee.3, the layout of device medium power element and actuated element can affect whole dimensional structure, also is related to the size shape of measuring test specimen.4, the fixture of clamping test specimen need to be considered the effect of tension-torsion combined load, wants Bending load simultaneously, and the jig Design difficulty is larger.In sum, design a structure ingenious, the material mechanical performance proving installation under the high combined load condition of measuring accuracy comes the mechanical property under the test material combined action very necessary.
Summary of the invention
The object of the present invention is to provide the material Micro Mechanical Properties test platform under a kind of stretching-bending-torsion multi-load, solved the problems referred to above that prior art exists.The present invention can integrated stretching/compressing test, crooked test, torsion test and based on the combined load test of above-mentioned two kinds of single load forms.Proving installation is comprised of tension and compression module, crooked module, torsion module, control detection module, test specimen clamping module.This proving installation structure is ingenious, can be under the combined load pattern the various comprehensive mechanical properties of test material.Can realize the Mechanics Performance Testing of material under tension and compression bending combined load pattern and goods thereof, draw/test of press-bending combined load, draw/presses and turn round combined load and test, also can realize Mechanics Performance Testing under tension and compression bending single load.
Above-mentioned purpose of the present invention is achieved through the following technical solutions:
The material Micro Mechanical Properties test platform under multi-load stretches-bending-reverses, comprise tension and compression module, crooked module, reverse module, control detection module, test specimen clamping module, test platform is take the tension and compression module as basic function module, reverse module arrangement at tension and compression module one end, its function can be separate or related with the tension and compression functions of modules, test specimen clamping module arrangement is on the tension and compression module, crooked module independently is arranged in portal frame 2 one sides on test platform, function and tension and compression module are separate, control detection module and are distributed on each functional module;
Described tension and compression module is: direct current generator 4 drives worm screw I 8 and rotates, worm screw I 8 drives worm gear I 7 and rotates, worm screw II 10 drives worm gear II 12 and rotates, outputting power rotates two-way ball-screw 11, be arranged on linear rolling track I 22 the two end supports seat from or move toward one another, realize stretching or compression to test specimen; Photoelectric encoder 3 is controlled the rotating speed size and Orientation of direct current generator 4, supports the taper roll bearing I 9 of worm shaft II 33 and bears the suffered axial force of worm screw, and two-way ball-screw 11 makes test specimen carry out two-direction pull press, guarantees the suffered load of test specimen symmetrically;
Described crooked module is: stepper motor II 23 is connected with ball-screw 27 by motor flange III 24, flexible coupling I 25, feed screw nut I 28 drives the supporting seat IV 35 that is arranged on guide rail II 34 and moves up and down, pressure head 31 moves down the bending load that realizes test specimen, the size and Orientation of stepper motor driver control step motor II 23 rotating speeds;
Described torsion module is: stepper motor I 17 driven gear II 19 are rotated, gear I 18 and 19 engagements of gear II, gear I 18 is arranged on axle 43, flexible coupling III 42 coupling shafts 43 and torque sensor 47, flexible coupling II 40 connects torque sensor 47 and fixture stationary shaft I 50, torque sensor 47 is fixed on sensor holder 41, fixture stationary shaft I 50 is arranged on supporting seat VI 48 by flange bearing I, II 58,59, and fixture lower platen I 51 is bolted together with fixture stationary shaft I 50;
Described control detection module comprises pull pressure sensor 15, pressure transducer 30, torque sensor 47, linear grating chi 37, circle grating 49, photoelectric encoder 3 and stepper motor driver, pull pressure sensor 15 is connected with supporting seat I 14 by bolt one end, the other end is connected with fixture support seat 16, fixture support seat 16 is arranged on supporting guide 54, when test specimen is subject to torsional load, the fixture support seat is delivered to torsional load on supporting guide 54, thereby avoids pull pressure sensor 15 to be subject to the impact of torsional load; Are connected and are connected with fixture stationary shaft I with axle 43 respectively by flexible coupling II, III 40,42 in torque sensor 47 two ends, supporting seat VI 48 inside are equipped with flange bearing I, II 58,59, bear axial load, avoid the impact of tensile load on torque sensor 47;
Described test specimen clamping module comprises fixture lower platen I, II 51,53 and fixture top board 52, fixture lower platen 51 is fixed by screws on clamp shaft 50, fixture lower platen 53 is fixed by screws on fixture support seat 16, the upper and lower pressing plate of fixture is bolted, and realizes the clamping to test specimen.
Described pull pressure sensor 15 is arranged between fixture support seat 16 and supporting seat I 14 on linear rolling track 22, be connected by screw, fixture support seat 16 is fixed by screws on supporting guide 54, and supporting guide 54 is fixed by screws on supporting seat I 14.
Described round grating 49 is enclosed within on the fixture stationary shaft I 50 that is connected with torque sensor 47, and biting connecions fixture and fixture stationary shaft I 50 be connected by screw, and circle grating 49 is measured the torsion angle displacements.
Described pressure transducer 30 1 ends are connected with pressure head 31, and the other end is connected with supporting seat IV 35 by screw, and 31 pairs of test specimens of pressure head apply bending force, and the size of bending force records by pressure transducer 30.
Described biting connecions fixture is comprised of the upper and lower pressing plate of the fixture of a pair of biting connecions, the fixture lower platen is fixed by square groove with fixture stationary shaft I 50 and fixture support seat 16 respectively, and by the clamp body attachment screw, connect, test specimen is the right cylinder revolving structure, by the upper and lower pressing plate of biting connecions fixture with laciniation to compress the mode clamping.
Described two-way ball-screw 11 is the two-way leading screw of left-right rotary, left and right stretching worktable midplane extrusion in drawing process, and sample focus target point position immobilizes.
Described pull pressure sensor 15 is accurate S type sensor.
Described crooked force sensor 30 is accurate S type sensor.
Beneficial effect of the present invention is:
1. the present invention is novel, compact overall structure, adopt the power source of three motors as three modules, three kinds of load of tension and compression bending are applied by three kinds of standalone modules respectively, the interference each other of not only being related but also having avoided between three modules, be subjected to force mode under the combined load of simulation material to the full extent.Adopt gantry as fixed support, take full advantage of the space of proving installation.
2. three power sources of the present invention can carry out by photoelectric encoder or driver the adjusting of output speed and torque, can be in experimentation the ratio of control load size and different loads, can carry out Mechanics Performance Testing under single load to material and goods thereof, also can carry out Mechanics Performance Testing under the combined loads such as stretch bending, tension-torsion.
3. sensor placement of the present invention is ingenious, pull pressure sensor is arranged in the top of supporting guide 54, the impact that can avoid torsional load to measure its tensile force, install a pair of flange bearing between torque sensor and fixture, can avoid the impact of Tensile or Compressive Loading on its torque measurement.
4. jig Design of the present invention is ingenious, adopt the form of lower platen on biting connecions, upper lower platen is bolted, can fully guarantee the stability of clamping test pieces with jagged upper lower platen, the coupling part design of two fixtures in left and right is different, stretched portion adopts square connection, and cylindrical connection is adopted in reverse part, has fully guaranteed the accuracy of test specimen bearing load.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and illustrative example of the present invention and explanation thereof are used for explaining the present invention, do not form improper restriction of the present invention.
Fig. 1 is overall appearance structural representation of the present invention;
Fig. 2 is that schematic diagram is looked on a left side of the present invention;
Fig. 3 is schematic rear view of the present invention;
Fig. 4 is the local enlarged diagram of pressure detection part in tension and compression module of the present invention;
Fig. 5 is the local enlarged diagram that the present invention reverses displacement test section in module;
Fig. 6 is the local enlarged diagram that the present invention reverses module;
Fig. 7 is the local enlarged diagram of test specimen clamping module of the present invention.
In figure: 1. pedestal; 2. portal frame; 3. photoelectric encoder; 4. direct current generator; 5. motor base; 6. motor flange I; 7. worm gear I; 8. worm screw I; 9. taper roll bearing I; 10. worm screw II; 11. two-way ball-screw; 12. worm gear II; 13. leading screw holder I; 14. supporting seat I; 15. pull pressure sensor; 16. fixture support seat; 17. stepper motor I; 18. gear I; 19. gear II; 20. motor flange II; 21. supporting seat II; 22. guide rail I; 23. stepper motor II; 24. motor flange III; 25. flexible coupling I; 26. leading screw holder II; 27. ball-screw; 28. feed screw nut; 29. supporting seat III; 30. pressure transducer; 31. pressure head; 32. worm shaft I; 33. worm shaft II; 34. guide rail II; 35. supporting seat IV; 36. grating stator; 37. linear grating chi; 38. grating reading head; 39. grating holder; 40. flexible coupling II; 41. sensor holder; 42. flexible coupling III; 43. axle; 44. hold-down nut I; 45. supporting seat V; 46. motor flange IV; 47. torque sensor; 48. supporting seat VI; 49. circle grating; 50. fixture stationary shaft I; 51. fixture lower platen I; 52. fixture top board; 53. fixture lower platen II; 54. supporting guide; 55. fixture stationary shaft II; 56. hold-down nut II; 57. taper roll bearing II; 58. flange bearing I; 59. flange bearing II; 60. circle grating reading head.
Embodiment
Further illustrate detailed content of the present invention and embodiment thereof below in conjunction with accompanying drawing.
To shown in Figure 5, the material Micro Mechanical Properties test platform under stretching-bending of the present invention-torsion multi-load, comprise tension and compression module, crooked module, reverse module, control detection module, test specimen clamping module referring to Fig. 1; Test platform is take the tension and compression module as basic function module, reverse module arrangement at tension and compression module one end, its function can be separate or related with the tension and compression functions of modules, test specimen clamping module arrangement is on the tension and compression module, crooked module independently is arranged in portal frame one side on test platform, function and tension and compression module are separate, control detection module and are distributed on each functional module.
described tension and compression module is: the direct current generator 4 that is fixed on motor base 5 drives 8 rotations of worm screw I, worm screw I 8 drives worm gear I 7 and rotates, worm screw II 10 drives worm gear II 12 and rotates, outputting power rotates the two-way ball-screw 11 that is arranged on leading screw holder I 13, drive be arranged on linear rolling track I 22 the two end supports seat from or move toward one another, stretching or the compression of realization to test specimen, the rotating speed size and Orientation of photoelectric encoder 3 monitoring direct current generators 4, support the taper roll bearing I of worm shaft II 33, II 9, 57 bear the suffered axial force of worm screw, two-way ball-screw 11 makes test specimen carry out two-direction pull press, guarantee the suffered load of test specimen symmetrically,
Described crooked module is arranged on portal frame 2, stepper motor II 23 is connected with ball-screw 27 by motor flange III 24, flexible coupling I 25, leading screw holder II 26, feed screw nut 28 drives the supporting seat IV 35 that is arranged on guide rail II 34 and moves up and down, pressure head 31 moves down the bending load that realizes test specimen, the size and Orientation of stepper motor driver control step motor II 23 rotating speeds;
described torsion module is that stepper motor I 17 is arranged on motor flange IV 46, rotate by flexible coupling driven gear II 19, gear II 19 is by hold-down nut I 44 axial location on supporting seat V 45, gear I 18 and 19 engagements of gear II, gear I 18 is arranged on axle 43, axle 43 is by motor flange II 20, flexible coupling III 42 coupling shafts 43 and torque sensor 47, flexible coupling II 40 connects torque sensor 47 and fixture stationary shaft I 50, torque sensor 47 is fixed on sensor holder 41, fixture stationary shaft I 50 is by flange bearing I 58, II 59 is arranged on supporting seat VI 48, fixture lower platen I 51 is bolted together with fixture stationary shaft I 50, fixture,
Described control detection module comprises pull pressure sensor 15, pressure transducer 30, torque sensor 47, linear grating chi 37, circle grating 49, photoelectric encoder 3 and stepper motor driver, pull pressure sensor 15 is connected with supporting seat I 14 by bolt one end, the other end is connected with fixture support seat 16, fixture support seat 16 is arranged on supporting guide 54, when test specimen is subject to torsional load, the fixture support seat is delivered to torsional load on supporting guide 54, thereby avoids pull pressure sensor 15 to be subject to the impact of torsional load; Are connected and are connected with fixture stationary shaft I with axle 43 respectively by flexible coupling III 42, II 40 in torque sensor 47 two ends, supporting seat VI 48 inside are equipped with flange bearing I 58, II 59, bear axial load, avoid the impact of tensile load on torque sensor 47; Linear grating chi 37 is connected with grating stator 36, is arranged on grating holder 39;
Described test specimen clamping module comprises fixture lower platen 51,53 and fixture top board 52, fixture lower platen 51 is fixed by screws on fixture clamp shaft I, fixture lower platen 53 is fixed by screws in square groove on fixture support seat 16 and is connected with fixture stationary shaft II 55, the upper and lower pressing plate of fixture is bolted, test specimen is the right cylinder revolving structure, by the upper and lower pressing plate of biting connecions fixture with laciniation to compress the mode clamping;
Described pull pressure sensor 15 is arranged between fixture support seat 16 and supporting seat I on linear rolling track 22, connect by hold-down nut II 56, fixture support seat 16 is fixed by screws on supporting guide 54, and supporting guide 54 is fixed by screws on supporting seat I 14;
Described round grating 49 is enclosed within on the fixture stationary shaft I 50 that is connected with torque sensor 47, and biting connecions fixture and fixture stationary shaft I 50 be connected by screw, and circle grating 49 is measured the torsion angle displacements;
Described pressure transducer 30 1 ends are connected with pressure head 31, and the other end is connected with supporting seat IV 35 by screw, and 31 pairs of test specimens of pressure head apply bending force, and the size of bending force records by pressure transducer 30;
Described two-way ball-screw 11 is the two-way leading screw of left-right rotary, left and right stretching worktable midplane extrusion in drawing process, and sample focus target point position immobilizes, and for fixed point applies crooked transverse force, provides advantage;
Described pull pressure sensor 15 and crooked force sensor 30 are accurate S type sensor.
To shown in Figure 7, the achieved stretch bending combined load value-added tax function of the material Micro Mechanical Properties test platform under stretching-bending of the present invention-torsion multi-load relates to functional module and comprises that direct current generator 4, two-stage form than twice-enveloping type worm couple and precision ball screw pair of nut than big retarding referring to Fig. 1; This two-stage consists of first-stage worm gear worm screw, second-stage worm gear worm screw than twice-enveloping type worm couple than big retarding; This direct current generator 4 is fixed on pedestal 1 by motor flange 6, and by flexible coupling, with the one-level worm screw, is connected; This second-stage worm gear is connected with precision ball screw by spring coupling; Stepper motor 23, flexible coupling and precision ball screw 27 form; Stepper motor 23 is fixed on portal frame 2 by motor flange 24, and by flexible coupling, with ball-screw 27, is connected.
Tension-torsion combined load value-added tax function relates to functional module and comprises that direct current generator 4, two-stage form than twice-enveloping type worm couple and ball-screw than big retarding; This two-stage consists of first-stage worm gear worm screw, second-stage worm gear worm screw than twice-enveloping type worm couple than big retarding; This direct current generator 4 is fixed on pedestal 1 by motor flange I 6, and by flexible coupling, with the one-level worm screw, is connected; This second-stage worm gear is enclosed within ball-screw 11 ends; Stepper motor, flexible coupling and primary speed-down straight spur gear are secondary to be formed; Stepper motor is fixed on pedestal 1 by motor flange 20 II, and by flexible coupling, with the axle that gear 18 I are installed, is connected.
Referring to Fig. 1 to Fig. 7, the involved concrete model of components and parts of material Micro Mechanical Properties test platform under the stretching-bending that the present invention relates to-torsion multi-load is: direct current generator 4 is 57ZW24-500 for dc brushless motor, model, stepper motor I 17 models are TDA221, stepper motor II 23 models are TDA103, guide rail I 22 models are 2SRS20M, and guide rail II 34 and supporting guide 54 models are SHW12CRM.
Material Micro Mechanical Properties test platform under stretching-bending of the present invention-torsion multi-load, comprise stretching module, crooked module, reverse three functional modules of module and control detection module.
Described tension and compression module embodiment is to drive worm shaft I 32 by tension and compression direct current generator 4 by flexible coupling to rotate, worm screw I 8 is fixed on worm shaft I 32, worm screw I 8 drives worm gear I 7 and rotates, worm gear I 7 is fixed on worm shaft II 33 with worm screw II 10, worm screw II 10 drives with the worm gear II 12 of its engagement and rotates, worm gear II 12 is fixed on two-way ball-screw 11 ends, two-way ball-screw 11 drives the supporting seat that is arranged on pair of guide rails in opposite directions or from motion, compression or the stretching of realization to test specimen.Photoelectric encoder 3 can carry out the control of rotating speed size and Orientation to tension and compression direct current generator 4, photoelectric encoder 3 can carry out the control of rotating speed size and Orientation to tension and compression direct current generator 4, two-way ball-screw 11 can guarantee the two-way stretch of test specimen, makes the suffered load of test specimen symmetrically.
Described crooked module is that stepper motor II 23 is connected with ball-screw 27 by flexible coupling III 24, feed screw nut 28 drives the supporting seat IV 35 that is arranged on guide rail 34 II and moves, pressure head 31 moves down test specimen is applied bending load, the size and Orientation that stepper motor driver can control step motor II 23 rotating speeds.
Described torsion module is that stepper motor I 17 is rotated by flexible coupling driven gear II 19, rotate with its meshed gears I 18, gear I 18 is arranged on gear shaft 43, flexible coupling III 42 connection teeth wheel shafts 43 and torque sensor 47, flexible coupling II 40 connects torque sensor 47 and flange bearing I 58, flange bearing I 58 and flange bearing II 59 are arranged on fixture stationary shaft I 50, fixture lower platen I 51 is bolted and is in the same place with fixture top board 52 and fixture stationary shaft I 50, and then realizes the torsion to test specimen.
Described control detection module comprises pull pressure sensor 15, crooked force sensor 30, torque sensor 47, linear grating chi 37, circle grating 49, photoelectric encoder 3 and stepper motor driver.Pull pressure sensor 15 is connected with supporting seat I 14 by bolt one end, the other end is connected with fixture support seat 16, fixture support seat 16 is arranged on supporting guide 54, when test specimen is subject to torsional load, the fixture support seat is delivered to torsional load on supporting guide 54, thereby avoids pull pressure sensor 15 to be subject to the impact of torsional load.Crooked force sensor 30 1 ends are connected with pressure head 31, and the other end is connected with bent support seat IV 35 by screw, and 31 pairs of test specimens of pressure head apply bending force and simultaneously power are delivered on crooked force sensor 30, thus the size of Measurement accuracy bending force.Are connected and are connected with fixture stationary shaft I with gear I 18 respectively by flexible coupling III, II 42,40 in torque sensor 47 two ends, supporting seat VI 48 inside are equipped with a pair of flange bearing I 58, II 59, can bear axial load, avoid the impact of tensile load on torque sensor 47.
Described two-way ball-screw 11 is the two-way leading screw of left-right rotary, left and right stretching worktable midplane extrusion in drawing process, and sample focus target point position immobilizes, and for fixed point applies crooked transverse force, provides advantage.
Described pull pressure sensor 15 and crooked force sensor 30 are accurate S type sensor.
The course of work of the present invention:
Under the effect of single axial tensile load: at first above-mentioned small cylindrical test specimen is placed on two biting connecions fixture lower platen I 51, II 53 broached-tooth designs, rotate two-way ball-screw 11 and regulate the test specimen initial position, test specimen two retained part is of convenient length.Corresponding top board is installed to relevant position with bolt, guarantees that test specimen is installed axis parallel with the experiment draw direction, adjust bolt, test specimen is compressed.Photoelectric encoder 3 and tension and compression direct current generator 4 form driver element,, by to photoelectric encoder 3 input pulse signals, control tension and compression direct current generator 4 rotating speeds and direction.The two-stage worm couple passes motion to two-way ball-screw 11, and realizing simultaneously slows down to increase turns round, and two-way ball-screw 11 rotates by two nuts drive supporting seat I 14 and moves round about.In drawing process, be fixed on the linear grating ruler reading head 38 on supporting seat II 21 and be fixed on grating scale 37 on pedestal 1 and gather displacement signals and send in computing machine and process, the pull pressure sensor 15 between supporting seat I 14 and fixture support seat 16 gathers load signals and sends into computing machine and process.The data of processing through software systems are shown as the stress-strain diagram of exosyndrome material mechanical property, and then obtain the every mechanics parameter of material.
Under single torsional load effect: same as above, the small cylindrical test specimen is carried out clamping, its initial position should make test specimen coaxial with fixture stationary shaft I 50.Pulse signal is sent into stepper motor driver, control step motor I 17 speed and direction.The a pair of gear pair that consists of gear I 18, II 19 passes motion to axle 43, axle 43 passes motion to torque sensor 47 by shaft coupling III 42, torque sensor 47 passes motion to fixture stationary shaft I 50 by shaft coupling II 40, fixture stationary shaft I 50 drives biting connecions fixture mounted thereto and rotates, the torsion of realization to test specimen one end, test specimen other end clamp body is fixed on supporting seat I 14 and does not rotate.In torsion test, the round grating read head 61 that is arranged on the round grating 49 on fixture stationary shaft I 50 and is fixed on supporting seat gathers test specimen torsion angle displacement signal and sends into computing machine, and the torque sensor 47 that is fixed on supporting seat by sensor holder 41 gathers the test piece torque signal and sends into computing machine., to sending into the processing of angular displacement and torque signal, obtain the mechanical parameters of this material under torsional load by computer software.
Under single bending load effect: same as above, the Small Cylindrical test specimen is carried out clamping, its initial position should make the test specimen mid point be positioned at being pressed into a little of pressure head 31.Pulse signal is sent into stepper motor driver, control step motor II 23 speed and direction, its motor output shaft is connected with ball-screw 27 by shaft coupling I 25, ball-screw 27 drives supporting seat III 29 by nut 28 and realizes the motion of vertical direction, pressure transducer 30 1 ends are fixed by screws on supporting seat III 29, the other end is connected with pressure head 31 by screw, and bending force is applied on test specimen by pressure head 31.During crooked experiment, first drive ram drops to and the test specimen contact condition, this moment is by the drive records umber of pulse, be set to initial state, test specimen is carried out bending load while applying, the bending force signal that pressure transducer 30 will collect is sent computing machine back to, utilizes computer software to process collection signal, obtains the associated materials mechanical property parameters.
Load under mode of operation at the tension-torsion different proportion: same as above, at first the small cylindrical test specimen is carried out clamping, make its initial position should make test specimen coaxial with fixture stationary shaft I 50.Control two motor speeds by photoelectric encoder 3 and torsion stepper motor driver, realize that tension-torsion load acts on simultaneously, by the linear grating chi with the circle optical-mechanical system gathers the test specimen stretching displacement and the torsion angle displacement signal is sent into computing machine, by pull pressure sensor 15 with torque sensor 47 gathers the test specimen tensions and the torsional moment signal is sent into computing machine.Computer software is processed the data that collect, and analyzes and obtains the mechanical property parameters of test specimen under this integrated mode.
Load under mode of operation at the stretch bending different proportion: same as above, at first the small cylindrical test specimen is carried out clamping, make its initial position should make the test specimen mid point be positioned at being pressed into a little of pressure head 31.Control two motor speeds by photoelectric encoder 3 and crooked stepper motor driver and realize that stretch bending load acts on simultaneously.Before driving photoelectric encoder 3, should first by controlling crooked stepper motor driver drive ram 31, drop to and the test specimen contact condition, be stretch bending experiment initial state, drive photoelectric encoder 3 this moment, realization time effect to test specimen pulling force and bending force, by the linear grating ruler system, test specimen stretching displacement signal is sent into computing machine, by pull pressure sensor 15 and pressure transducer 30, gather the test specimen pulling force and the bending force signal is sent into computing machine.Computer software is processed the data that collect, and analyzes and obtains the mechanical property parameters of material under this integrated mode.
The foregoing is only 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 modifications made for the present invention, be equal to replacement, improvement etc., within protection scope of the present invention all should be included in.

Claims (8)

1. the material Micro Mechanical Properties test platform under stretching-bending-torsion multi-load, it is characterized in that: comprise the tension and compression module, crooked module, reverse module, control detection module, test specimen clamping module, test platform is take the tension and compression module as basic function module, reverse module arrangement at tension and compression module one end, its function can be separate or related with the tension and compression functions of modules, test specimen clamping module arrangement is on the tension and compression module, crooked module independently is arranged in portal frame (2) one sides on test platform, function and tension and compression module are separate, controlling detection module is distributed on each functional module,
Described tension and compression module is: direct current generator (4) drives worm screw I (8) and rotates, worm screw I (8) drives worm gear I (7) and rotates, worm screw II (10) drives worm gear II (12) and rotates, outputting power rotates two-way ball-screw (11), be arranged on linear rolling track I (22) the two end supports seat from or move toward one another, realize stretching or compression to test specimen; Photoelectric encoder (3) is controlled the rotating speed size and Orientation of direct current generator (4), support the taper roll bearing I (9) of worm shaft II (33) and bear the suffered axial force of worm screw, two-way ball-screw (11) makes test specimen carry out two-direction pull press, guarantees the suffered load of test specimen symmetrically;
Described crooked module is: stepper motor II (23) is connected with ball-screw (27) by motor flange III (24), flexible coupling I (25), feed screw nut I (28) drives the supporting seat IV (35) that is arranged on guide rail II (34) and moves up and down, pressure head (31) moves down the bending load that realizes test specimen, the size and Orientation of stepper motor driver control step motor II (23) rotating speed;
described torsion module is: stepper motor I (17) driven gear II (19) is rotated, gear I (18) and gear II (19) engagement, gear I (18) is arranged on axle (43), flexible coupling III (42) coupling shaft (43) and torque sensor (47), flexible coupling II (40) connects torque sensor (47) and fixture stationary shaft I (50), torque sensor (47) is fixed on sensor holder (41), fixture stationary shaft I (50) is by the flange bearing I, II (58, 59) be arranged on supporting seat VI (48), fixture lower platen I (51) is bolted together with fixture stationary shaft I (50),
described control detection module comprises pull pressure sensor (15), pressure transducer (30), torque sensor (47), linear grating chi (37), circle grating (49), photoelectric encoder (3) and stepper motor driver, pull pressure sensor (15) is connected with supporting seat I (14) by bolt one end, the other end is connected with fixture support seat (16), fixture support seat (16) is arranged on supporting guide (54), when test specimen is subject to torsional load, the fixture support seat is delivered to torsional load on supporting guide (54), thereby avoid pull pressure sensor (15) to be subject to the impact of torsional load, torque sensor (47) two ends are connected 50 with axle (43) with fixture stationary shaft I respectively by flexible coupling II, III (40,42)) be connected, supporting seat VI (48) inside is equipped with flange bearing I, II (58,59), bear axial load, avoid the impact of tensile load on torque sensor (47),
Described test specimen clamping module comprises fixture lower platen I, II (51,53) and fixture top board (52), fixture lower platen (51) is fixed by screws on clamp shaft (50), fixture lower platen (53) is fixed by screws on fixture support seat (16), the upper and lower pressing plate of fixture is bolted, and realizes the clamping to test specimen.
2. the material Micro Mechanical Properties test platform under stretching-bending according to claim 1-torsion multi-load, it is characterized in that: described pull pressure sensor (15) is arranged between fixture support seat (16) and supporting seat I (14) on linear rolling track (22), be connected by screw, fixture support seat (16) is fixed by screws on supporting guide (54), and supporting guide (54) is fixed by screws on supporting seat I (14).
3. the material Micro Mechanical Properties test platform under stretching-bending according to claim 1-torsion multi-load, it is characterized in that: described round grating (49) is enclosed within on the fixture stationary shaft I (50) that is connected with torque sensor (47), and biting connecions fixture and fixture stationary shaft I (50) are connected by screw, and circle grating (49) is measured the torsion angle displacement.
4. the material Micro Mechanical Properties test platform under stretching-bending according to claim 1-torsion multi-load, it is characterized in that: described pressure transducer (30) one ends are connected with pressure head (31), the other end is connected with supporting seat IV (35) by screw, pressure head (31) applies bending force to test specimen, and the size of bending force records by pressure transducer (30).
5. the material Micro Mechanical Properties test platform under stretching-bending according to claim 3-torsion multi-load, it is characterized in that: described biting connecions fixture is comprised of the upper and lower pressing plate of the fixture of a pair of biting connecions, the fixture lower platen is fixed by square groove with fixture stationary shaft I (50) and fixture support seat (16) respectively, and by the clamp body attachment screw, connect, test specimen is the right cylinder revolving structure, by the upper and lower pressing plate of biting connecions fixture with laciniation to compress the mode clamping.
6. the material Micro Mechanical Properties test platform under stretching-bending according to claim 1-torsion multi-load, it is characterized in that: described two-way ball-screw (11) is the two-way leading screw of left-right rotary, left and right stretching worktable midplane extrusion in drawing process, sample focus target point position immobilizes.
7. the material Micro Mechanical Properties test platform under stretching-bending according to claim 1 and 2-torsion multi-load is characterized in that: described pull pressure sensor (15) is accurate S type sensor.
8. the material Micro Mechanical Properties test platform under according to claim 1 or 4 described stretching-bending-torsion multi-loads, it is characterized in that: described crooked force sensor (30) is accurate S type sensor.
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