CN203643278U - Device for testing microscopic mechanical property of four-point bending material in situ under microscope - Google Patents
Device for testing microscopic mechanical property of four-point bending material in situ under microscope Download PDFInfo
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- CN203643278U CN203643278U CN201420004203.3U CN201420004203U CN203643278U CN 203643278 U CN203643278 U CN 203643278U CN 201420004203 U CN201420004203 U CN 201420004203U CN 203643278 U CN203643278 U CN 203643278U
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- 238000012360 testing method Methods 0.000 title claims abstract description 58
- 239000000463 material Substances 0.000 title claims abstract description 29
- 238000013001 point bending Methods 0.000 title claims abstract description 20
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 17
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Abstract
The utility model relates to a device for testing microscopic mechanical property of a four-point bending material in situ under a microscope, belonging to the field of precision scientific instruments. The device comprises a precision drive/transmission unit, a signal detection unit and a loading unit, wherein a precision direct current servo motor decelerates to output power through a reducer; an output shaft is connected with a pair of reversing gears through a flexible coupling; the power is transmitted to a worm shaft; the motion is transferred to a ball screw nut through a worm and gear pair; a loading tool head is driven to perform a four-point bending loading test on a test piece sample; the signal detection unit consists of a strain gage and a photoelectric encoder. The device has the advantages of being compact in structure, small in size, light in weight and low in energy consumption, the span of the bending loading part is adjustable, the related mechanical property parameters of materials can be accurately measured, the device can be particularly integrated with a commercial metallographic microscope and an optical microscope and is conveniently debugged, and the deformation damage and microstructure change of the materials under the action of the bending stress can be subjected to dynamic visual in-situ monitoring by means of the microscope.
Description
Technical field
The utility model relates to exact science instrument field, particularly the four-point bending material Micro Mechanical Properties in-situ testing device under a kind of microscope.Can be arranged on the in-situ observation that under commercialization metaloscope or optical microscope, three-dimensional solid-state material is carried out four-point bending Mechanics Performance Testing and microcosmic complexion, by material microdeformation, damage and mechanical property direct correlation, the impact of research microstructure change on macroscopic material mechanical property.
Background technology
In-situ mechanical test refers under micro-/ nano yardstick to be carried out in the process of Mechanics Performance Testing material for test, by instruments such as optical microscope, electron microscope and atomic force microscopes, microdeformation, the damage of material under various loads and goods generation thereof is carried out to omnidistance dynamically a kind of mechanical test means of on-line monitoring.This technology discloses the related law between mechanical behavior, micromechanism of damage and load type, size and the material property of various types of materials and goods thereof from microcosmic point.The test of original position four-point bending is the one of in-situ mechanical method of testing, can reflect the bending strength characteristic of construction material, and can measure the most intuitively the important mechanics parameters such as elasticity modulus of materials, yield limit and fracture strength.Four-point bending stress moment of flexure is uniformly distributed, and sample interlude is not subject to the impact of shearing, it is carried out to in-situ observation and be more convenient for finding the microlesion of material under load.
The current research for original position crooked test is still in the junior stage, concrete manifestation is as follows: (1) is subject to the restriction of various Electronic Speculum cavity space, most research at present all concentrates on the atomic minor structures such as nano wire, nanotube and membraneous material is carried out to original position stretching test, lacks the further investigation of the Mechanics Performance Testing to macro-size test specimen and the in-situ observation of micromechanism.Limit for the Micromechanics behavior of macro-size material and deeply probing into of fracture damage mechanism.(2) the present home position testing method of comparative maturity, is to be mainly used in conjunction with by means of business-like nano-hardness tester and original position stretching instrument and Electronic Speculum, these measuring method cost of equipment costlinesses, and method is single.(3) the bending charger of current original position generally can only be observed the side of sample, is difficult to provide online observation and the microscopic appearance in draw/compressive stress of material maximum district is changed, and has restricted the development of material Micro Mechanical Properties research.
Summary of the invention
The purpose of this utility model is to provide the in-situ testing device of the four-point bending material Micro Mechanical Properties under a kind of microscope, when having solved existing flexural measurement instrument material being tested, it is separate problems that separate that measuring mechanical property and test specimen microscopic appearance change two processes of observation.The utility model, in the time that test specimen is carried out to crooked test, can be realized adjustable span and measure, and by adjusting the relative position up and down of loading unit, the microscopic appearance that can bear maximum crushing stress face and maximum tension stress face to test specimen changes and carries out original position detection of dynamic.
Above-mentioned purpose of the present utility model is achieved through the following technical solutions:
Four-point bending material Micro Mechanical Properties in-situ testing device under microscope, comprise accurate driving/gear unit, detecting signal unit and loading unit, described accurate driving/gear unit is that DC servo motor 2 is by speed reduction unit 3 output movements and power, be connected with tumbler gear I, II 9,13 via bellow spring coupling 6, be connected with ball-screw I, II 16,20 by worm set I, II 7,24 and worm gear I, II 4,23 again, and drive a loading tool I, II 28,29 rectilinear motions to realize moment of flexure loading by nut I, II 15,19.
Described DC servo motor 2 is axially connected with speed reduction unit 3, and is connected by screw with motor supporting base 5, and motor supporting base 5 is connected on pedestal 8; Bellows coupling 6 is connected with speed reduction unit 3 output shafts and commutating tooth wheel shaft I 10 respectively, and gear shaft I, II 10,12 are supported in platform side plate I, II 11,21 by precision bearing respectively; Tumbler gear I, II 9,13 are connected in gear shaft I, II 10,12 by holding screw, worm set I, II 7,24 and worm gear I, II 4,23 are connected with gear shaft II 12 and precision ball screw I, II 16,20 tightenings respectively, and fixed supporting seat I, the II 14,22 of ball-screw I, II 16,20 are connected in baffle plate II 31 by screw; Nut I, II 15,19 and a loading tool supporting seat I, II 27,30 are connected by screw.
The use of tumbler gear and the reasonable Arrangement of worm and gear, the tangential movement that DC servo motor 2 is exported is converted to the power output on a loading tool I, II 28,29 vertical directions, realize vertical loading, vacant go out the maximum stress surface of test specimen, the elements such as metaloscope easy to use are observed test specimen 18 maximum stress places, when loading, observation area horizontal direction maintains static, and forms good field of view.
Described detecting signal unit is made up of foil gauge 35 and photoelectric encoder 1, and described photoelectric encoder 1 is coaxially connected with DC servo motor 2, and described foil gauge 35 is directly affixed on test specimen 18 surfaces; Photoelectric encoder 1 is a kind of angle detection device, it is directly connected with rotor, with the synchronized rotation of DC servo motor 2, by calculating the output pulse number reflection motor angle displacement of photoelectric encoder 1, and be converted to the displacement of a proving installation execution unit loading tool I, II 28,29, the i.e. sag of test specimen in loading procedure by transmission.Foil gauge 35 is directly affixed on test specimen 18 surfaces, by detecting the output signal of foil gauge, can indirectly obtain bending stress.
Described loading unit is made up of a loading tool I, II 28,29 and supporting tool head I, II 17,34, a described loading tool I, II 28,29 are connected with a loading tool supporting seat I, II 27,30 respectively, supporting tool head I, II 17,34 are connected with side plate I, II 11,21 respectively, then pass through fastening nuts; The connecting hole of side plate I, II 11,21 and a loading tool supporting seat I, II 27,30 adopts ellipse, can realize the four-point bending Mechanics Performance Testing of test specimen under different spans.
Described supporting tool head I, II 17,34 maintain static, and a loading tool I, II 28,29 move up and down.By adjusting the relative position up and down of a loading tool I, II 28,29 and supporting tool head I, II 17,34, can realize under four-point bending loads, test specimen 18 be born to the microscopic appearance variation of maximum crushing stress face and maximum tension stress face and carry out original position detection of dynamic.
A described loading tool supporting seat I, II 27,30 are fixed in slide block I, II 25,33, and guide rail I, II 26,32 are individually fixed in side plate I, II 11,21 by screw; A described loading tool supporting seat I, II 27,30 are made up of single wide type guide rail guided bearing respectively, simple in structure, and ensure the stable of loading procedure.
The beneficial effects of the utility model are: compared with existing instrument, the utility model compact conformation, volume is little, lightweight, energy consumption is low, measuring accuracy is high, can test material many kinds of force mathematic(al) parameter, and can with the hardware compatibility such as business-like metaloscope and optical microscope, the micromechanism distortion on draw/compressive stress of test specimen maximum surface is carried out to dynamic monitoring.And can pass through the synchronous detection of load/displacement signal, in conjunction with relevant software algorithm, automatic Fitting generates the stress-strain diagram under bending load effect, practical.The utility model is to enriching original position crooked test field method of testing and promoting the development of testing tool and progress to have very large meaning.
Brief description of the drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, forms the application's a part, and illustrative example of the present utility model and explanation thereof are used for explaining the utility model, do not form improper restriction of the present utility model.
Fig. 1 is the one-piece construction schematic diagram of the utility model under metaloscope;
Fig. 2 is that the utility model is removed the structural representation after baffle plate I 36;
Fig. 3 is that the utility model is removed the front view after baffle plate I 36
Fig. 4 is that the utility model is removed the vertical view after baffle plate I 36;
Fig. 5 is the utility model test specimen loading section structural representation (observing test specimen maximum tension stress face);
Fig. 6 is the utility model test specimen loading section structural representation (observing test specimen maximum crushing stress face).
In figure: 1, photoelectric encoder; 2, DC servo motor; 3, speed reduction unit; 4, worm gear I; 5, motor flange dish; 6, bellow spring coupling; 7, worm set I; 8, pedestal; 9, tumbler gear I; 10, gear shaft I; 11, base side boards I; 12, gear shaft II; 13, tumbler gear II; 14, fixed supporting seat I; 15, nut I; 16, ball-screw I; 17, supporting tool head I; 18, test specimen; 19, nut II; 20, ball-screw II; 21, base side boards II; 22, fixed supporting seat II; 23, worm gear II; 24, worm set II; 25, slide block I; 26, guide rail I; 27, a loading tool supporting seat I; 28, a loading tool I; 29, a loading tool II; 30, a loading tool supporting seat II; 31, baffle plate II; 32, guide rail II; 33, slide block II; 34, supporting tool head II; 35, foil gauge; 36, baffle plate I; 37, metaloscope.
Embodiment
Further illustrate detailed content of the present utility model and embodiment thereof below in conjunction with accompanying drawing.
Referring to shown in Fig. 1 to Fig. 6, four-point bending material Micro Mechanical Properties in-situ testing device under microscope of the present utility model, comprise accurate driving/gear unit, the structure such as detecting signal unit and loading unit, described precision driving/gear unit is: DC servo motor 2 is by speed reduction unit 3 output movements and power, via bellow spring coupling 6 and a pair of tumbler gear I, II 9, 13 connect, again by worm set I, II 7, 24 and worm gear I, II 4, 23 and two ball-screw I, II 16, 20 connect, and by nut I, II 15, 19 drive a loading tool I, II 28, 29 rectilinear motions are realized moment of flexure and are loaded.
Described DC servo motor 2 is axially connected with speed reduction unit 3, and speed reduction unit 3 is connected by screw with motor supporting base 5, and motor supporting base 5 is connected on pedestal 8 by screw.Bellows coupling 6 is connected with speed reduction unit 3 output shafts and commutating tooth wheel shaft I 9 respectively, and gear shaft I, II 10,12 are supported in side plate I, II 11,21 by precision bearing respectively, and coordinates installation with side plate dead eye.Tumbler gear I, II 9,13 are connected in gear shaft I, II 10,12 by holding screw.Worm set I, II 7,24 and worm gear I, II 4,23 are connected with gear shaft II 12 and precision ball screw I, II 16,20 tightenings respectively.Fixed supporting seat I, the II 14,22 of ball-screw I, II 16,20 adopt screw to be connected in baffle plate II 31.Nut I, II 15,19 and a loading tool supporting seat I, II 27,30 are connected by screw, the web joint of a loading tool supporting seat I, II 27,30 is fixed in slide block I, II 25,33, and guide rail I, II 26,32 adopt screw to be fixed on side plate I, II 11,21.
Described detecting signal unit is made up of foil gauge 35 and photoelectric encoder 1, and photoelectric encoder 1 is coaxially connected with DC servo motor 2, and foil gauge 35 is directly affixed on test specimen 18 surfaces.Photoelectric encoder 1 is a kind of angle detection device, it is directly connected with rotor, with the synchronized rotation of motor 2, by calculating the output pulse number reflection motor angle displacement of photoelectric encoder 1, and be converted to the displacement of proving installation execution unit loading tool head, the i.e. sag of test specimen in loading procedure by transmission.Foil gauge 35 is directly affixed on test specimen 18 surfaces, by detecting the output signal of foil gauge 35, can indirectly obtain the bending stress of test specimen.
Described loading unit is made up of a loading tool I, II 28,29 and supporting tool head I, II 17,34, a described loading tool I, II 28,29 are connected with a loading tool supporting seat I, II 27,30 respectively, supporting tool head I, II 17,34 are connected with side plate I, II 11,21 respectively, then pass through fastening nuts.The connecting hole of side plate I, II 11,21 and a loading tool supporting seat I, II 27,30 adopts ellipse, can realize the four-point bending Mechanics Performance Testing of test specimen under different spans.
A described loading tool supporting seat I, II 27,30 are connected and are supported by single wide slide block, simplify the structure, and realize the stationarity of motion.A loading tool supporting seat I, II 27,30 are separately fixed in slide block I, II 25,33, and guide rail I, II 26,32 adopt screw to be fixed on side plate I, II 11,21.
The use of described tumbler gear and the reasonable Arrangement of worm and gear, the tangential movement that motor 2 is exported is converted to the power output on a loading tool I, II 28,29 vertical directions, realize vertical loading, vacant go out the maximum stress surface of test specimen, metaloscope 37 elements such as grade easy to use are observed test specimen 18 maximum stress places, when loading, observation area horizontal direction maintains static, and forms good field of view.
The load mode of four-point bending of the present utility model can make material sample neutral line both sides bear different stresses, and the first side of loading tool is born compressive stress, and the first side of supporting tool is born tension.Described loading tool head and the relative position of supporting tool head are adjusted by ball guide screw nat, can realize under four-point bending loads, and test specimen 18 are born to the microscopic appearance variation of maximum crushing stress face and maximum tension stress face and carry out original position detection of dynamic.If Fig. 5 is that Fig. 6 observes test specimen maximum crushing stress surface to observing on test specimen maximum tension stress surface.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All any amendments that the utility model is done, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (4)
1. the four-point bending material Micro Mechanical Properties in-situ testing device under a microscope, it is characterized in that: comprise accurate driving/gear unit, detecting signal unit and loading unit, described accurate driving/gear unit is that DC servo motor (2) is by speed reduction unit (3) output movement and power, via bellow spring coupling (6) and tumbler gear I, II (9, 13) connect, again by worm set I, II (7, 24) and worm gear I, II (4, 23) with ball-screw I, II (16, 20) connect, and by nut I, II (15, 19) drive a loading tool I, II (28, 29) rectilinear motion is realized moment of flexure loading,
Described DC servo motor (2) is axially connected with speed reduction unit (3), and is connected by screw with motor supporting base (5), and motor supporting base (5) is connected on pedestal (8); Bellows coupling (6) is connected with speed reduction unit (3) output shaft and commutating tooth wheel shaft I (10) respectively, and gear shaft I, II (10,12) are supported in platform side plate I, II (11,21) by precision bearing respectively; Tumbler gear I, II (9,13) are connected in gear shaft I, II (10,12) by holding screw, worm set I, II (7,24) and worm gear I, II (4,23) are connected with gear shaft II (12) and precision ball screw I, II (16,20) tightening respectively, and fixed supporting seat I, the II (14,22) of ball-screw I, II (16,20) are connected in baffle plate II (31) by screw; Nut I, II (15,19) are connected by screw with a loading tool supporting seat I, II (27,30).
2. the four-point bending material Micro Mechanical Properties in-situ testing device under microscope according to claim 1, it is characterized in that: described detecting signal unit is made up of foil gauge (35) and photoelectric encoder (1), described photoelectric encoder (1) is coaxially connected with DC servo motor (2), and described foil gauge (35) is directly affixed on test specimen (18) surface.
3. the four-point bending material Micro Mechanical Properties in-situ testing device under microscope according to claim 1, it is characterized in that: described loading unit is made up of a loading tool I, II (28,29) and supporting tool head I, II (17,34), a described loading tool I, II (28,29) are connected with a loading tool supporting seat I, II (27,30) respectively, supporting tool head I, II (17,34) are connected with side plate I, II (11,21) respectively, then pass through fastening nuts; Side plate I, II (11,21) adopt ellipse with the connecting hole of a loading tool supporting seat I, II (27,30).
4. according to the four-point bending material Micro Mechanical Properties in-situ testing device under the microscope described in claim 1 or 3, it is characterized in that: a described loading tool supporting seat I, II (27,30) are fixed on slide block I, II (25,33) is upper, and guide rail I, II (26,32) are individually fixed in side plate I, II (11,21) by screw; A described loading tool supporting seat I, II (27,30) are made up of single wide type guide rail guided bearing respectively.
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| CN201420004203.3U CN203643278U (en) | 2014-01-03 | 2014-01-03 | Device for testing microscopic mechanical property of four-point bending material in situ under microscope |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420004203.3U CN203643278U (en) | 2014-01-03 | 2014-01-03 | Device for testing microscopic mechanical property of four-point bending material in situ under microscope |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104359769A (en) * | 2014-11-11 | 2015-02-18 | 吉林大学 | In-situ test instrument for micromechanics performances of materials under three-point and four-point bending action |
| CN105043897A (en) * | 2015-08-10 | 2015-11-11 | 北京航空航天大学 | Monocrystalline silicon small-sized test article high temperature creep resistance four-point bending test system and method |
| CN108072579A (en) * | 2017-11-23 | 2018-05-25 | 吉林大学 | The impact indentation test device and method of variable bit rate |
| CN108627396A (en) * | 2018-05-04 | 2018-10-09 | 武汉理工大学 | A kind of test method of ultra-thin glass bending strength |
| CN114509336A (en) * | 2021-12-27 | 2022-05-17 | 中国北方发动机研究所(天津) | Adjustable hard brittle material surface stress loading device |
-
2014
- 2014-01-03 CN CN201420004203.3U patent/CN203643278U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104359769A (en) * | 2014-11-11 | 2015-02-18 | 吉林大学 | In-situ test instrument for micromechanics performances of materials under three-point and four-point bending action |
| CN105043897A (en) * | 2015-08-10 | 2015-11-11 | 北京航空航天大学 | Monocrystalline silicon small-sized test article high temperature creep resistance four-point bending test system and method |
| CN108072579A (en) * | 2017-11-23 | 2018-05-25 | 吉林大学 | The impact indentation test device and method of variable bit rate |
| CN108627396A (en) * | 2018-05-04 | 2018-10-09 | 武汉理工大学 | A kind of test method of ultra-thin glass bending strength |
| CN108627396B (en) * | 2018-05-04 | 2020-02-14 | 武汉理工大学 | Method for testing bending strength of ultrathin glass |
| CN114509336A (en) * | 2021-12-27 | 2022-05-17 | 中国北方发动机研究所(天津) | Adjustable hard brittle material surface stress loading device |
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