CN103364281B - The material mechanical property in-situ three-point bend test platform that test environment temperature is adjustable - Google Patents
The material mechanical property in-situ three-point bend test platform that test environment temperature is adjustable Download PDFInfo
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Abstract
The present invention relates to the material mechanical property in-situ three-point bend test platform that a kind of test environment temperature is adjustable, belong to field of in-situ mechanical property test.It is heated test specimen by resistance wire, in conjunction with the observation of high magnification solid-state CCD industry imaging lens, the material Micromechanics behavior such as germinating, expansion of the change of its heterogeneous microstructure and crackle under bending load effect at different ambient temperatures can be monitored dynamically.The present invention is primarily of precision actuation gear unit, detecting unit, imaging system unit, Temperature Field Control unit, supplemental support unit composition.Advantage is: simple and compact for structure, stable drive, effectively in conjunction with temperature field and stress field, in-situ observation can be carried out to the microdeformation of material, Damage and fracture process under high-resolution imaging system, provide brand-new method of testing for disclosing material at different temperatures mechanical characteristic after the match and damage mechanisms.
Description
Technical field
The present invention relates to field of in-situ mechanical property test, the material mechanical property in-situ three-point bend test platform that test environment temperature is adjustable.Dynamic realtime observation can be carried out to the germinating of the microstructure morphology of test material, lattice variations, crackle, expansion and fracture by high multiple solid-state CCD industry imaging system in different temperature fields.To be material provide a kind of brand-new means based on the mechanics properties testing in temperature field to this Mechanics Performance Testing device.
Background technology
In-situ mechanical test refers to be carried out in the process of Mechanics Performance Testing to material for test under micro-/ nano yardstick, and the microdeformation that can be occurred material under various load effect by micro imaging systems such as atomic force microscope, electron microscope and optical microscopes, tissue topography and Crack Damage etc. carry out a kind of mechanical measuring and calculation method of real-time online observation.This technology can microcosmic point to various types of materials and goods thereof mechanical behavior, Damage mechanism under various load effect.In the category of many micro nanometer mechanics performance tests, the parameters such as elastic modulus, shear modulus, hardness, yield limit, break limit are topmost tested objects in micro structures mechanical property testing, various test is created, as stretching/compressing method, bending method, shearing method, torsional technique, nano impress/cut and eardrum method etc. for these mechanics parameters.Its situ three-point bend test method can reflect material or goods mechanical characteristic in a flexed condition according more all sidedly, occupies an important position in the middle of various types of materials test process.It is fairly simple that it is mainly manifested in charger, require lower to the processing technology of bending specimen, there is not the problems such as harsh centering clamping, larger distortion can be produced simultaneously under less load effect, contribute to test process and obtain deformation effect comparatively intuitively.
Along with the fast development of aerospace industry in modern age, the rapid emergence of the novel high-tech products such as aircraft rocket, air-fired missile, space shuttle, the development of new type high temperature compound substance, exploitation and measuring technology are more and more subject to the attention of scientific research field and industry manufacture field.Based on the active demand of space industry to high temperature, following new material one of to be explored and is: utilize multiparticle bundle physical vapour deposition (PVD) or multiparticle evaporation coating technique that the metal material having high tenacity, high temperature oxidation corrosion resistance material and have high strength is made multilayer material by different layers thickness rate, to obtain the compound microbedding plate having two or more material property concurrently.Micro-Composite Laminates such as this typical high temperature intermetallics has intensity and the chemical stability of metal toughness and pottery concurrently, can in order to the alternative high temperature alloy that waits as re-entry space vehicle solar heat protection cover plate.In recent years, the U.S. has made great progress in the research of heat-resisting alloy honeycomb composite structure and mild alloy compound wall structure two kinds of heat insulation materials, can produce large-sized plane and curved surface tile at present, and solve the connectivity problem of metal tile and fuselage.China has also carried out large quantifier elimination in association area, and the material mechanical performance New techniques therefore carried out based on temperature field has broad prospects.
The three point bending test of current comparative maturity is generally rely on large-scale Apparatus for Bending at low-temp to off normal test to material test specimen.Bending loading procedure loads sample with uniform rate according to relevant criterion, by corresponding load displacement sensing unit force signal and displacement be sent in computing machine and draw load-deflection curve, bond material cross section attribute and then obtain stress-strain curve under load effect.But conventional bending testing machine for be mostly large scale test specimen at normal temperatures, do not relate to the mechanical property research of sample micro-nano-scale category, the impact of temperature field on material property is not considered yet, and mostly belong to test of offing normal, do not relate to the in-situ observation of corresponding micro imaging system.Current exploitation in-situ testing device mainly has following characteristics: (1) is from the compatibility issue of proving installation and imaging system, because the cavity space of scanning electron microscope, transmission electron microscope and atomic force microscope etc. is very limited, to such an extent as to current majority research all concentrates on based on micro-/nano electromechanical systems principle, carry out on simple in-situ nano extension test to atomic minor structures such as nanotube, nano wire and membraneous materials, lack the further investigation of the original position micro-/ nano Mechanics Performance Testing to the above macrospecimen of characteristic dimension centimetre-sized; (2) from measuring accuracy, mainly concentrate on the research and development of the reliability and stability of micro actuator, the accurate measurement means of load displacement signal and sample are processed, are clamped, to medium problem.
In view of China is for the research also relative backwardness of compound microbedding plate with the mechanical property of the materials such as thermal barrier coating.Therefore, under exploitation hot environment, the method for testing of material mechanical performance has great importance.By the mechanical property of each component layer material in test microbedding plate, for the estimating of microbedding plate performance, to be out of shape and the research of failure mechanism lays the foundation.On basis based on material mechanical performance means of testing such as this stretching in macroscopic view, bending and torsions, in conjunction with temperature field and in-situ test theory, traditional proving installation is become a kind of trend to miniaturization, precision and multifunction future development.The present invention caters to the growth requirement of above material mechanical performance test just, develop a kind of can based on the material in situ three-point bending test device in temperature field.
Summary of the invention
The object of the present invention is to provide the material mechanical property in-situ three-point bend test platform that a kind of test environment temperature is adjustable, solve the problems referred to above that prior art exists.The present invention not only can meet the mechanical property of materials test process of standard, and the temperature field response in position for material mechanical performance in mechanical test provides technological means.For propelling high performance material performance in-situ test technology in high temperature environments, there is very important effect.
Above-mentioned purpose of the present invention is achieved through the following technical solutions:
The material mechanical property in-situ three-point bend test platform that test environment temperature is adjustable, comprise precision actuation gear unit, detecting unit, imaging system unit, Temperature Field Control unit, supplemental support unit, the phenomenon such as germinating, expansion for material microstructure morphology, lattice variations, crackle under different temperatures field action is carried out original position and is observed dynamically in real time;
Described precision actuation gear unit is made up of direct current generator 3, axle 20, worm screw 19 and worm gear 21, wherein, direct current generator 3 is fastened in frame 2 by screw II 18, and output shaft and the worm screw 19 of motor 3 are connected, slowing down through worm gear 21 outputs power on axle 20, and realizing significantly slows down increases torsion effect; Axle 20 driven gear II 33 rotates, and by the engagement of gear, rotary motion is passed to gear I 35 simultaneously, and the eccentric orfice of gear I, II 35,33 is connected with connecting rod I, II 37,31 respectively by bearing pin I, II 36,22; The other end of connecting rod I, II 37,31 is connected with slider I, II 23,29 respectively by pin shaft III, IV 32,30; By this structure by the convert rotational motion of gear pair eccentric orfice be slider I, II 23, the rectilinear motion of 29; Slider I, II 23,29 is led by slide rail I, II 25,28 respectively, adopts V-type groove to lead therebetween, and slide rail I, II 25,28 is fixed by screw V 27 respectively and between frame 2; Described precision actuation gear unit adopts full symmetric mode to arrange, utilize slider-crank mechanism to be slider I by the convert rotational motion of gear I, II 35,33 dexterously, II 23, the rectilinear motion of 29, output loads is stable, reliable and symmetrical;
Described detecting unit is made up of force snesor 6, laser displacement sensor I, II 5,8, wherein, force snesor 6 two ends are fixedly connected with pressure head 7, frame 2 respectively by connecting thread, and laser displacement sensor I, II 5,8 is fixedly connected with by screw IV 26 with between frame 2; Described force snesor 6, laser displacement sensor I, II 5,8 detect the change of test specimen 10 load and displacement in three-point bending deformation process respectively;
Described imaging system unit primarily of CCD industry imaging lens 12, support I, II 15,11, reversing frame 14, pressing plate 13 and adjusting knob 16 formation, wherein, CCD industry imaging lens 12 is fastened between pressing plate 13 and reversing frame 14 by screw VI 34, can rotate with reversing frame 14; Support I, to be fixed by screw III 24 between II 15,11 and frame 2, for supporting CCD industry imaging lens 12; Can be regulated the imaging angle of CCD camera lens by adjusting knob 16; Described imaging system unit utilizes CCD imaging lens 12 can observe the phenomenon such as germinating, expansion of Fine Texture of Material pattern, lattice variations, crackle;
Described Temperature Field Control unit forms primarily of resistive heater 9 and temperature controller 4, wherein, temperature controller 4 is the adjustable switch of a voltage, just can regulate heating-up temperature to test specimen 10 easily, to realize different heating-up temperatures by controlling temperature controller 4 to the supply voltage of resistive heater 9;
Described supplemental support unit is formed primarily of frame 2, upper cover plate 1, is fixedly connected with between upper cover plate 1 with frame 2 by screw I 17; Whole test platform is divided into two relatively independent spaces by frame 2 and upper cover plate 1, can effectively avoids driving, signal disturbing between control assembly and detecting unit, protection motor is by the impact of resistive heater.
Described precision actuation gear unit by classical slider-crank mechanism the rotary motion of gear I, II 35,33 is converted into dexterously slider I, II 23, the rectilinear motion of 29, and then promote test specimen 10 and press to pressure head 7, deflection deformation occurs; Because pressure head 7 maintains static, test specimen 10 two ends slider I, II 23, synchronously move down under the effect of 29, ensure that the height of the central point of test specimen 10 does not change, be convenient to realize home position observation; And take two slider-crank mechanisms are arranged symmetrically with, and leave larger space in test specimen 10 central observation region, be convenient to apply temperature field and in situ imaging camera lens.
Described imaging system unit adopts the solid-state CCD industry imaging lens 12 of high multiple and adjusting mechanism thereof, can to the germinating of Fine Texture of Material pattern, lattice variations, crackle, expansion in test process
dengphenomenon carries out in-situ observation; Rotate the view field imaging angle of adjusting knob 16 adjustable CCD industry imaging lens 12, ensure that there is good imaged viewing angle.
Described Temperature Field Control unit carries out contact heating by resistive heater 9 pairs of test specimens 10, the supply voltage to resistive heater 9 is regulated by temperature controller 5, test specimen 10 can reach thermal equilibrium at different temperature under different supply voltages, and then completes and load the alternating temperature of test specimen 10.
Described frame 2 entirety adopts T-type structure, whole test platform is divided into two relatively independent spaces in conjunction with upper cover plate 1, direct current generator 3, temperature controller 4 are interposed between both sides with force snesor 6, laser displacement sensor I, II 5,8 points, avoid the big current of direct current generator 3 and temperature controller 4 to the interference of the Weak current of force snesor 6, laser displacement sensor I, II 5,8; Also help simultaneously and load side to being divided by the heat of resistive heater 9 to be interposed between, reduce the impact on motor.
Described force snesor 6 two ends are fixedly connected with pressure head 7, frame 2 respectively, adopt two laser displacement sensors I, II 5,8 measure respectively test specimen 10 two ends to bottom offset, two paths of data is averaged, effectively can reduce the winding degree caused because of test specimen deflection and test inaccurate problem, this method of testing can obtain good test result.
Beneficial effect of the present invention is: the present invention is not limited to traditional three-point bending mechanical property test, combine in-situ testing technique by original means of testing, original position can be carried out for the phenomenon such as germinating, expansion of Fine Texture of Material pattern, lattice variations, crackle under different temperatures field action and observe dynamically in real time in the process of three-point bending.In driving, adopt symmetrical expression arrangement of gears, forming typical slider-crank mechanism drives the bending pressure head of both sides to realize press-bending action, this kind of arrangement both sides pressure head drives respectively by two cover slider-crank mechanisms, in the middle part of test specimen, reserved larger space, is convenient to the applying and the control that realize temperature field.In one-piece construction, this proving installation compact conformation, driver module, detection module and loading temperature field module distribution, in different insulating spaces, avoid the mutual interference between modules between signal.In applying temperature field, this device adopts resistive heater contact heating, and structure simply controls conveniently, and the temperature that can realize in a big way in conjunction with heat balance principle regulates.This proving installation caters to the growth requirement of present material Mechanics Performance Testing, develop a kind of can based on the material in situ three-point bending mechanical test platform in temperature field, not only can meet the mechanical property of materials test process of standard, and the temperature field response in position for material mechanical performance in mechanical test provides technological means.Simultaneously this test platform also has simple and compact for structure, stable drive, stress field and the advantage such as temperature field combines, and has broad application prospects.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a application's part, and illustrative example of the present invention and explanation thereof, for explaining the present invention, do not form inappropriate limitation of the present invention.
Fig. 1 is complete machine axis side view of the present invention;
Fig. 2 is left view of the present invention;
Fig. 3 is front elevation of the present invention;
Fig. 4 is test specimen heating part partial enlargement (2:1) schematic diagram of the present invention.
In figure: 1. upper cover plate; 2. frame; 3. direct current generator; 4. temperature controller; 5. laser displacement sensor I; 6. force snesor; 7. pressure head; 8. laser displacement sensor II; 9. resistive heater; 10. test specimen; 11. supports II; 12.CCD industry imaging lens; 13. pressing plates; 14. reversing frames; 15. supports I; 16. adjusting knobs; 17. screws I; 18. screws II; 19. worm screws; 20. axles; 21. worm gears; 22. pin shaft II; 23. slider I; 24. screws III; 25. slide rails I; 26. screws IV; 27. screws V; 28. slide rails II; 29. slide blocks II; 30. bearing pins IV; 31. connecting rods II; 32. pin shaft III; 33. gears II; 34. screws VI; 35. gears I; 36 bearing pins I; 37. connecting rods I.
Embodiment
Detailed content of the present invention and embodiment thereof is further illustrated below in conjunction with accompanying drawing.
See shown in Fig. 1 to Fig. 4, the material mechanical property in-situ three-point bend test platform that test environment temperature of the present invention is adjustable, comprise precision actuation gear unit, detecting unit, imaging system unit, Temperature Field Control unit, supplemental support unit, the phenomenon such as germinating, expansion for material microstructure morphology, lattice variations, crackle under different temperatures field action is carried out original position and is observed dynamically in real time;
Described precision actuation gear unit is made up of direct current generator 3, axle 20, worm screw 19 and worm gear 21, wherein, direct current generator 3 is fastened in frame 2 by screw II 18, and output shaft and the worm screw 19 of motor 3 are connected, slowing down through worm gear 21 outputs power on axle 20, and realizing significantly slows down increases torsion effect; Axle 20 driven gear II 33 rotates, and by the engagement of gear, rotary motion is passed to gear I 35 simultaneously, and the eccentric orfice of gear I, II 35,33 is connected with connecting rod I, II 37,31 respectively by bearing pin I, II 36,22; The other end of connecting rod I, II 37,31 is connected with slider I, II 23,29 respectively by pin shaft III, IV 32,30; By this structure by the convert rotational motion of gear pair eccentric orfice be slider I, II 23, the rectilinear motion of 29; Slider I, II 23,29 is led by slide rail I, II 25,28 respectively, adopts V-type groove to lead therebetween, and slide rail I, II 25,28 is fixed by screw V 27 respectively and between frame 2; Described precision actuation gear unit adopts full symmetric mode to arrange, utilize slider-crank mechanism to be slider I by the convert rotational motion of gear I, II 35,33 dexterously, II 23, the rectilinear motion of 29, output loads is stable, reliable and symmetrical;
Described detecting unit is made up of force snesor 6, laser displacement sensor I, II 5,8, wherein, force snesor 6 two ends are fixedly connected with pressure head 7, frame 2 respectively by connecting thread, and laser displacement sensor I, II 5,8 is fixedly connected with by screw IV 26 with between frame 2; Described force snesor 6, laser displacement sensor I, II 5,8 detect the change of test specimen 10 load and displacement in three-point bending deformation process respectively;
Described imaging system unit primarily of CCD industry imaging lens 12, support I, II 15,11, reversing frame 14, pressing plate 13 and adjusting knob 16 formation, wherein, CCD industry imaging lens 12 is fastened between pressing plate 13 and reversing frame 14 by screw VI 34, can rotate with reversing frame 14; Support I, to be fixed by screw III 24 between II 15,11 and frame 2, for supporting CCD industry imaging lens 12; Can be regulated the imaging angle of CCD camera lens by adjusting knob 16; Described imaging system unit utilizes CCD imaging lens 12 can observe the phenomenon such as germinating, expansion of Fine Texture of Material pattern, lattice variations, crackle;
Described Temperature Field Control unit forms primarily of resistive heater 9 and temperature controller 4, wherein, temperature controller 4 is the adjustable switch of a voltage, just can regulate heating-up temperature to test specimen 10 easily, to realize different heating-up temperatures by controlling temperature controller 4 to the supply voltage of resistive heater 9;
Described supplemental support unit is formed primarily of frame 2, upper cover plate 1, is fixedly connected with between upper cover plate 1 with frame 2 by screw I 17; Whole test platform is divided into two relatively independent spaces by frame 2 and upper cover plate 1, can effectively avoids driving, signal disturbing between control assembly and detecting unit, protection motor is by the impact of resistive heater.
Described precision actuation gear unit by classical slider-crank mechanism the rotary motion of gear I, II 35,33 is converted into dexterously slider I, II 23, the rectilinear motion of 29, and then promote test specimen 10 and press to pressure head 7, deflection deformation occurs; Because pressure head 7 maintains static, test specimen 10 two ends slider I, II 23, synchronously move down under the effect of 29, ensure that the height of the central point of test specimen 10 does not change, be convenient to realize home position observation; And take two slider-crank mechanisms are arranged symmetrically with, and leave larger space in test specimen 10 central observation region, be convenient to apply temperature field and in situ imaging camera lens.
Described imaging system unit adopts the solid-state CCD industry imaging lens 12 of high multiple and adjusting mechanism thereof, can to the germinating of Fine Texture of Material pattern, lattice variations, crackle, expansion in test process
dengphenomenon carries out in-situ observation; Rotate the view field imaging angle of adjusting knob 16 adjustable CCD industry imaging lens 12, ensure that there is good imaged viewing angle.
Described Temperature Field Control unit carries out contact heating by resistive heater 9 pairs of test specimens 10, the supply voltage to resistive heater 9 is regulated by temperature controller 5, test specimen 10 can reach thermal equilibrium at different temperature under different supply voltages, and then completes and load the alternating temperature of test specimen 10.
Described frame 2 entirety adopts T-type structure, whole test platform is divided into two relatively independent spaces in conjunction with upper cover plate 1, direct current generator 3, temperature controller 4 are interposed between both sides with force snesor 6, laser displacement sensor I, II 5,8 points, avoid the big current of direct current generator 3 and temperature controller 4 to the interference of the Weak current of force snesor 6, laser displacement sensor I, II 5,8; Also help simultaneously and load side to being divided by the heat of resistive heater 9 to be interposed between, reduce the impact on motor.
Described force snesor 6 two ends are fixedly connected with pressure head 7, frame 2 respectively, adopt two laser displacement sensors I, II 5,8 measure respectively test specimen 10 two ends to bottom offset, two paths of data is averaged, effectively can reduce the winding degree caused because of test specimen deflection and test inaccurate problem, this method of testing can obtain good test result.
Precision actuation gear unit provides power by DC servo motor, carries out deceleration increasing turn round via big retarding than accurate worm and gear deceleration.The outputting power of worm shaft adopts typical slider-crank mechanism, the rotary motion of gear is converted into the rectilinear motion of slide block via eccentric delivery outlet, and then compressing test specimen generation deflection deformation.In deformation process, both sides pressure head synchronously presses down and can guarantee that in the middle part of test specimen, amount of deflection maximum is not moved, and is easy to realize in-situ observation.Detecting unit comprises force snesor, laser displacement sensor, detects the change of test specimen load and displacement in bending deformation process respectively.Imaging system unit is by CCD camera lens, rotation of lens governor motion and be configured to, the phenomenon such as germinating, expansion of observation Fine Texture of Material pattern that can be real-time, lattice variations, crackle.Temperature Field Control unit is made up of resistive heater, temperature detect switch (TDS), can provide different probe temperatures by regulating the supply voltage of temperature detect switch (TDS) for test test specimen.
See shown in Fig. 1 to Fig. 4, specific works process of the present invention is as follows:
The applying of field, temperature field and the adjustment of in situ imaging system: test before starting, open Temperature Field Control switch, voltage-controlled mode is adopted to regulate the size of electric current in resistive heater 9, until the heat that test specimen 10 absorbs from resistance wire is with when environment dispersed heat reaches a kind of mobile equilibrium towards periphery, keep heating voltage constant until complete whole test process.The screw VI 34 of pressing plate 13 is unclamped before experiment, distance between adjustable lens and test specimen with or clearly image, in test process, under the supporting role of pressure head 7, test specimen central point remains constant, adjustment adjusting knob 16 can realize the adjustment of minute angle, obtains best image effect.
The realization of three-point bending: first, power is spread out of by direct current generator 3, drives the increasing that realizes significantly slowing down of worm screw 19, worm gear 21 to turn round.Secondly, worm gear 21 by power transmission to gear I 35, now with the reverse rotation of gear I 35 pitch wheel II 33.The rotary motion of gear I, II 35,33 is delivered in slider I, II 23,29 via connecting rod I, II 37,31, slider I, II 23,29 moves linearly under the guide effect of slide rail I, II 25,28, whole mechanism forms a pair slider-crank mechanism, the most at last the convert rotational motion of gear I, II 35,33 be slider I, II 23, the rectilinear motion of 29, and then promotion test specimen 10 presses to pressure head 7, makes test specimen 10 that the deflection deformation of three-point bending occur.In test process, force snesor 6 and laser displacement sensor I, II 5,8 are sent in process computer the every mechanical property parameters obtaining material after the signal collected being carried out amplify sampling processing, real-time store, the test specimen microdeformation image information collected with the stress of test specimen of CCD industry imaging lens 12 simultaneously--strain curve is corresponding in real time just can obtain the in-situ mechanical test parameter of material based on pre-add temperature field easily.
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 amendments made for the present invention, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. the material mechanical property in-situ three-point bend test platform that a test environment temperature is adjustable, it is characterized in that: comprise precision actuation gear unit, detecting unit, imaging system unit, Temperature Field Control unit, supplemental support unit, carry out original position observe dynamically in real time for the germinating of material microstructure morphology, lattice variations, crackle under different temperatures field action, expansion;
Described precision actuation gear unit is made up of direct current generator (3), axle (20), worm screw (19) and worm gear (21), wherein, direct current generator (3) is fastened in frame (2) by screw II (18), output shaft and the worm screw (19) of motor (3) are connected, and slowing down through worm gear (21) outputs power on axle (20); Axle (20) driven gear II (33) rotates, by the engagement of gear, rotary motion is passed to gear I (35) simultaneously, the eccentric orfice of gear I, II (35,33) is connected with connecting rod I, II (37,31) respectively by bearing pin I, II (36,22); The other end of connecting rod I, II (37,31) is connected with slider I, II (23,29) respectively by pin shaft III, IV (32,30); Be the rectilinear motion of slider I, II (23,29) by the convert rotational motion of gear pair eccentric orfice by this structure; Slider I, II (23,29) are led by slide rail I, II (25,28) respectively, adopt V-type groove to lead therebetween, and slide rail I, II (25,28) is fixed by screw V (27) respectively and between frame (2); Described precision actuation gear unit adopts full symmetric mode to arrange, utilize slider-crank mechanism to be the rectilinear motion of slider I, II (23,29) dexterously by the convert rotational motion of gear I, II (35,33), output loads is stable, reliable and symmetrical;
Described detecting unit is made up of force snesor (6), laser displacement sensor I, II (5,8), wherein, force snesor (6) two ends are fixedly connected with pressure head (7), frame (2) respectively by connecting thread, and laser displacement sensor I, II (5,8) is fixedly connected with by screw IV (26) with between frame (2); Described force snesor (6), laser displacement sensor I, II (5,8) detect the change of test specimen (10) load and displacement in three-point bending deformation process respectively;
Described imaging system unit is formed primarily of CCD industry imaging lens (12), support I, II (15,11), reversing frame (14), pressing plate (13) and adjusting knob (16) part, wherein, CCD industry imaging lens (12) is fastened between pressing plate (13) and reversing frame (14) by screw VI (34), rotates with reversing frame (14); Fixed by screw III (24) between support I, II (15,11) and frame (2), for supporting CCD industry imaging lens (12); Regulated by the imaging angle of adjusting knob (16) to CCD industry imaging lens; Described imaging system unit utilizes CCD industry imaging lens (12) observation Fine Texture of Material pattern, lattice variations, the germinating of crackle, expansion;
Described Temperature Field Control unit is primarily of resistive heater (9) and temperature controller (4) composition, wherein, temperature controller (4) is the adjustable switch of a voltage, by controlling temperature controller (4) to the heating-up temperature of the supply voltage of resistive heater (9) adjustment to test specimen (10), to realize different heating-up temperatures;
Described supplemental support unit is formed primarily of frame (2), upper cover plate (1), is fixedly connected with between upper cover plate (1) with frame (2) by screw I (17); Whole test platform is divided into two relatively independent spaces by frame (2) and upper cover plate (1), avoids driving, signal disturbing between control assembly and detecting unit, protection motor is by the impact of resistive heater.
2. the material mechanical property in-situ three-point bend test platform that test environment temperature according to claim 1 is adjustable, it is characterized in that: the convert rotational motion of gear I, II (35,33) is the rectilinear motion of slider I, II (23,29) by slider-crank mechanism by described precision actuation gear unit, and then promotion test specimen (10) presses to pressure head (7), there is deflection deformation; Because pressure head (7) maintains static, test specimen (10) two ends synchronously move down under the effect of slider I, II (23,29), ensure that the height of the central point of test specimen (10) does not change, are convenient to realize home position observation; And take two slider-crank mechanisms are arranged symmetrically with, and leave larger space in test specimen (10) central observation region, be convenient to apply temperature field and CCD industry imaging lens.
3. the material mechanical property in-situ three-point bend test platform that test environment temperature according to claim 1 is adjustable, it is characterized in that: described imaging system unit adopts solid-state CCD industry imaging lens (12) of high multiple and adjusting mechanism thereof, in test process, carry out in-situ observation to the germinating of Fine Texture of Material pattern, lattice variations, crackle, expansion; Rotate the view field imaging angle that adjusting knob (16) regulates CCD industry imaging lens (12), ensure that there is good imaged viewing angle.
4. the material mechanical property in-situ three-point bend test platform that test environment temperature according to claim 1 is adjustable, it is characterized in that: described Temperature Field Control unit carries out contact heating by resistive heater (9) to test specimen (10), the supply voltage to resistive heater (9) is regulated by temperature controller (5), test specimen (10) can reach thermal equilibrium at different temperature under different supply voltages, and then completes and load the alternating temperature of test specimen (10).
5. the material mechanical property in-situ three-point bend test platform that test environment temperature according to claim 1 is adjustable, it is characterized in that: described frame (2) entirety adopts T-type structure, whole test platform is divided into two relatively independent spaces in conjunction with upper cover plate (1), by direct current generator (3), temperature controller (4) and force snesor (6), laser displacement sensor I, II (5, 8) divide and be interposed between both sides, avoid the big current of direct current generator (3) and temperature controller (4) to force snesor (6), laser displacement sensor I, II (5, 8) interference of Weak current, also help simultaneously and load side to being divided by the heat of resistive heater (9) to be interposed between, reduce the impact on motor.
6. the material mechanical property in-situ three-point bend test platform that test environment temperature according to claim 1 is adjustable, it is characterized in that: described force snesor (6) two ends are fixedly connected with pressure head (7), frame (2) respectively, adopt two laser displacement sensors I, II (5,8) measure respectively test specimen (10) two ends to bottom offset, two paths of data is averaged.
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| CN103674728B (en) * | 2013-12-03 | 2016-04-13 | 北京垠海工程技术研究有限责任公司 | Three-point bending Force meansurement machine |
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| 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 |
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