CN103364281A - Material mechanical property in-situ three-point bending test platform with adjustable test environment temperature - Google Patents
Material mechanical property in-situ three-point bending test platform with adjustable test environment temperature Download PDFInfo
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Abstract
The invention relates to a material mechanical property in-situ three-point bending test platform with adjustable test environment temperature, and belongs to the field of in-situ mechanical property test. Test elements are heated up through resistance wires, and are observed by combining with a high-amplification-factor solid state CCD (charge coupled device) industrial imaging lens, and the microstructure variation as well as micromechanics behaviors of crack production, expanding and the like of materials at different environment temperatures under the bending load effect can be monitored dynamically. The material mechanical property in-situ three-point bending test platform with adjustable test environment temperature provided by the invention mainly comprises a precision driving transmission unit, a detecting unit, an imaging system unit, a temperature field control unit and an auxiliary support unit. The material mechanical property in-situ three-point bending test platform with adjustable test environment temperature has the advantages that the structure is simple and compact, the transmission is stable, and a temperature field and stress field are effectively combined, in-situ observation can be carried out on micro deformation, damage and cracking process of materials under a high-resolution imaging system, and thus a novel test method is provided for revealing the mechanical property and the damage mechanism of materials under different temperature fields.
Description
Technical field
The present invention relates to the in-situ mechanical field tests, the material mechanical performance original position three-point bending test platform that the test environment temperature is adjustable.In different temperature fields, can carry out dynamic real-time monitored to germinating, expansion and the fracture of the microstructure morphology of test material, lattice variations, crackle by the solid-state CCD of high multiple industry imaging system.This Mechanics Performance Testing device detects a kind of brand-new means that provide for material based on the mechanical property in temperature field.
Background technology
The in-situ mechanical test refers under the micro-/ nano yardstick material for test be carried out in the process of Mechanics Performance Testing, can carry out by microdeformation, tissue topography and the Crack Damage etc. that the micro imaging systems such as atomic force microscope, electron microscope and optical microscope occur material under the various loads a kind of mechanical measuring and calculation method that real-time online is observed.This technology can be on the microcosmic point to various types of materials and goods thereof mechanical behavior, the Damage mechanism under various loads.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 little member mechanical property testing, produced various test for these mechanics parameters, such as stretching/compressing method, bending method, shearing method, torsional technique, nano impress/cut and eardrum method etc.Its situ three-point bending method of testing can reflect material or the mechanical characteristic of goods under bending condition more all sidedly, occupies an important position in the middle of the various types of materials test process.It is fairly simple that it is mainly manifested in charger, processing technology to bending specimen requires lower, there are not the harsh problems such as centering clamping, under less load, can produce larger distortion simultaneously, help test process to obtain comparatively intuitively deformation effect.
Fast development along with the 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 more and more are subject to the attention of scientific research field and industry manufacture field.Based on the active demand of space industry to high temperature, one of following new material exploration is: utilize multiparticle bundle physical vapour deposition (PVD) or multiparticle evaporation coating technique will have high tenacity, high temperature oxidation corrosion resistance material and have high-intensity metal material and make multilayer material by the different layers thickness rate, to obtain to have concurrently the compound microbedding plate of two or more material property.The microbedding plate compound substances such as this typical high temperature intermetallics have intensity and the chemical stability of metal toughness and pottery concurrently, can wait high temperature alloy as empty day aircraft solar heat protection cover plate in order to substitute.In recent years, the U.S. can produce large-sized plane and curved surface tile at present, and solve the connectivity problem of metal tile and fuselage having obtained remarkable progress aspect the research of high temperature alloy honeycomb composite structure and two kinds of heat insulation materials of mild alloy compound wall structure.China has also carried out a large amount of research in association area, and the material mechanical performance test new technology of therefore carrying out based on the temperature field has broad prospects.
At present the three point bending test of comparative maturity generally is to rely on large-scale Apparatus for Bending at low-temp to the material test specimen test of offing normal.Crooked loading procedure loads sample with uniform rate according to relevant criterion, by corresponding load displacement sensing unit force signal and displacement are sent to and draw load-deflection curve in the computing machine, bond material cross section attribute and then obtain stress-strain curve under load.But the conventional bending testing machine for mostly be at normal temperatures large scale test specimen, do not relate to the mechanical property research of sample micro-nano-scale category, do not consider that the temperature field is on the impact of material property yet, and mostly belong to the test of offing normal, do not relate to the in-situ observation of corresponding micro imaging system.The exploitation in-situ testing device mainly has following characteristics at present: (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 present majority research all concentrate on take little/receive the Mechatronic Systems principle as the basis, the atomic minor structures such as nanotube, nano wire and membraneous material are carried out on the simple in-situ nano extension test, lack the further investigation to the original position micro-/ nano Mechanics Performance Testing of 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 processing, clamping, to medium problem.
In view of China also relative backward with the research of the mechanical property of the materials such as thermal barrier coating for compound microbedding plate.Therefore, the method for testing of material mechanical performance has great importance under the exploitation hot environment.By the mechanical property of each component layer material in the test microbedding plate, for the research of the estimating of microbedding plate performance, distortion and failure mechanism lays the foundation.Based on this stretching in macroscopic view, crooked and reverse etc. on the basis of material mechanical performance means of testing, in conjunction with temperature field and in-situ test theory, traditional proving installation has been 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, developed a kind of can be 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 adjustable material mechanical performance original position three-point bending test platform of a kind of test environment temperature, solved the problems referred to above that prior art exists.The present invention not only can satisfy the mechanical property of materials test process of standard, and in position in the mechanical test temperature field response for material mechanical performance technological means is provided.For advancing the performance in-situ test technology of high performance material under hot environment to have very important effect.
Above-mentioned purpose of the present invention is achieved through the following technical solutions:
The material mechanical performance original position three-point bending test platform that the test environment temperature is adjustable, comprise accurate gear unit, detecting unit, imaging system unit, Temperature Field Control unit, the supplemental support unit of driving, carry out in real time dynamic observation of original position for phenomenons such as the germinating of material microstructure morphology, lattice variations, crackle under the different temperatures field action, expansions;
The described accurate gear unit that drives is comprised of direct current generator 3, axle 20, worm screw 19 and worm gear 21, wherein, direct current generator 3 is fastened on the frame 2 by screw II 18, and the output shaft of motor 3 and worm screw 19 are connected, output power on the axle 20 through worm gear 21 decelerations, realizing significantly slows down increases torsion effect; Axle 20 driven gear II 33 are rotated, and the engagement by gear will rotatablely move and pass to simultaneously gear I 35, and gear I, II 35,33 eccentric orfice link to each other with connecting rod I, II 37,31 by bearing pin I, II 36,22 respectively; Connecting rod I, II 37,31 the other end link to each other with slide block I, II 23,29 by bearing pin III, IV 32,30 respectively; By this structure rotatablely moving of gear pair eccentric orfice is converted into slide block I, II 23,29 rectilinear motion; Slide block I, II 23,29 are led by slide rail I, II 25,28 respectively, adopt the V-type groove to lead between the two, and slide rail I, II 25,28 are fixed by screw V 27 respectively and between the frame 2; The described accurate gear unit that drives adopts the full symmetric mode to arrange, utilizes slider-crank mechanism dexterously with gear I, II 35,33 rotatablely move and be converted into slide block I, II 23,29 rectilinear motion, and output loads is stable, reliable and symmetrical;
Described detecting unit is made of power sensor 6, laser displacement sensor I, II 5,8, wherein, power sensor 6 two ends are fixedly connected with pressure head 7, frame 2 respectively by connecting thread, laser displacement sensor I, II 5,8 with frame 2 between be fixedly connected with by screw IV 26; Described power sensor 6, laser displacement sensor I, II 5,8 detect respectively the variation of test specimen 10 load and displacement in the three-point bending deformation process;
Described imaging system unit mainly is made of CCD industry imaging lens 12, support I, II 15,11, reversing frame 14, pressing plate 13 and 16 of adjusting knobs, wherein, CCD industry imaging lens 12 is fastened on it between pressing plate 13 and the reversing frame 14 by screw VI 34, can rotate with reversing frame 14; Support I, II 15,11 and frame 2 between fixing by screw III 24, be used for supporting CCD industry imaging lens 12; Can regulate the imaging angle of CCD camera lens by adjusting knob 16; Described imaging system unit by using CCD imaging lens 12 can be observed the phenomenons such as the germinating, expansion of Fine Texture of Material pattern, lattice variations, crackle;
Described Temperature Field Control unit mainly is comprised of resistive heater 9 and temperature controller 4, wherein, temperature controller 4 is a switch that voltage is adjustable, just can regulate easily heating-up temperature to test specimen 10 for the supply voltage of resistive heater 9 by control temperature controller 4, to realize different heating-up temperatures;
Described supplemental support unit mainly is made of frame 2, upper cover plate 1, is fixedly connected with by screw I 17 between upper cover plate 1 and the frame 2; By frame 2 and upper cover plate 1 whole test platform is divided into two relatively independent spaces, can effectively avoids driving, the signal between control assembly and the detecting unit disturbs, the protection motor is not subjected to the impact of resistive heater.
The described accurate slider-crank mechanism of gear unit by classics that drive be gear I, II 35,33 rotatablely move and be converted into dexterously slide block I, II 23,29 rectilinear motion, and then promote test specimen 10 and press to pressure head 7, and deflection deformation occurs; Because pressure head 7 maintains static, test specimen 10 two ends move down under slide block I, II 23,29 effect synchronously, have guaranteed that the height of the central point of test specimen 10 does not change, and are convenient to realize home position observation; And two slider-crank mechanisms taking are arranged symmetrically with, and leave larger space in observation area, test specimen 10 center, are convenient to apply temperature field and in situ imaging camera lens.
Described imaging system unit adopts the solid-state CCD of high multiple industry imaging lens 12 and adjusting mechanism thereof, can be in test process to germinating, the expansion of Fine Texture of Material pattern, lattice variations, crackle
DengPhenomenon is carried out in-situ observation; Rotate adjusting knob 16 and can regulate the view field imaging angle of CCD industry imaging lens 12, guarantee to have preferably imaging visual angle.
Described Temperature Field Control unit carries out contact heating by 9 pairs of test specimens of resistive heater 10, by the supply voltage of temperature controller 5 adjustings to resistive heater 9, test specimen 10 can reach thermal equilibrium under the different supply voltages under different temperature, and then the alternating temperature of finishing test specimen 10 loads.
The T-shaped structure of described frame 2 whole employings, in conjunction with upper cover plate 1 whole test platform is divided into two relatively independent spaces, direct current generator 3, temperature controller 4 and power sensor 6, laser displacement sensor I, II 5,8 separated in both sides, and the large electric current of having avoided direct current generator 3 and temperature controller 4 is to the interference of power sensor 6, laser displacement sensor I, II 5,8 Weak current; Also help simultaneously the heat of resistive heater 9 is separated loading a side, reduce the impact on motor.
Described power sensor 6 two ends are fixedly connected with pressure head 7, frame 2 respectively, adopt two laser displacement sensor I, II 5,8 measure respectively test specimen 10 two ends to bottom offset, two paths of data is averaged, can effectively reduce the winding degree that causes because of the test specimen deflection and test inaccurate problem, this method of testing can obtain preferably test result.
Beneficial effect of the present invention is: the present invention is not limited to traditional three-point bending mechanical property test, to combine in-situ testing technique on original means of testing, in the process of three-point bending, can carry out in real time dynamic observation of original position for phenomenons such as the germinating of Fine Texture of Material pattern, lattice variations, crackle under the different temperatures field action, expansions.Aspect driving, adopt the symmetrical expression arrangement of gears, form the crooked pressure head realization press-bending action that typical slider-crank mechanism drives both sides, this kind arrangement both sides pressure head drives by two cover crank slide block mechanisms respectively, reserve larger space at the test specimen middle part, be convenient to realize applying and controlling of temperature field.On one-piece construction, this proving installation compact conformation, driver module, detection module and load temperature field module distribution have been avoided the phase mutual interference between the signal between the modules in different insulating spaces.This device adopts resistive heater contact heating aspect the temperature field applying, and control simple in structure is convenient, the adjustment in can realizing in a big way in conjunction with heat balance principle.This proving installation caters to the growth requirement of present material Mechanics Performance Testing, developed a kind of can be based on the material in situ three-point bending mechanical test platform in temperature field, not only can satisfy the mechanical property of materials test process of standard, and in position in the mechanical test temperature field response for material mechanical performance technological means is provided.Simultaneously this test platform also has simple and compact for structure, stable drive, stress field and the advantages such as the temperature field combines, and has broad application prospects.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative example of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction 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 local (2:1) synoptic diagram that amplifies of test specimen heating part of the present invention.
Among the figure: 1. upper cover plate; 2. frame; 3. direct current generator; 4. temperature controller; 5. laser displacement sensor I; 6. power sensor; 7. pressure head; 8. laser displacement sensor II; 9. resistive heater; 10. test specimen; 11. support II; 12.CCD industrial imaging lens; 13. pressing plate; 14. reversing frame; 15. support I; 16. adjusting knob; 17. screw I; 18. screw II; 19. worm screw; 20. axle; 21. worm gear; 22. bearing pin II; 23. slide block I; 24. screw III; 25. slide rail I; 26. screw IV; 27. screw V; 28. slide rail II; 29. slide block II; 30. bearing pin IV; 31. connecting rod II; 32. bearing pin III; 33. gear II; 34. screw VI; 35. gear I; 36 bearing pin I; 37. connecting rod I.
Embodiment
Further specify detailed content of the present invention and embodiment thereof below in conjunction with accompanying drawing.
Extremely shown in Figure 4 referring to Fig. 1, the material mechanical performance original position three-point bending test platform that test environment temperature of the present invention is adjustable, comprise accurate gear unit, detecting unit, imaging system unit, Temperature Field Control unit, the supplemental support unit of driving, carry out in real time dynamic observation of original position for phenomenons such as the germinating of material microstructure morphology, lattice variations, crackle under the different temperatures field action, expansions;
The described accurate gear unit that drives is comprised of direct current generator 3, axle 20, worm screw 19 and worm gear 21, wherein, direct current generator 3 is fastened on the frame 2 by screw II 18, and the output shaft of motor 3 and worm screw 19 are connected, output power on the axle 20 through worm gear 21 decelerations, realizing significantly slows down increases torsion effect; Axle 20 driven gear II 33 are rotated, and the engagement by gear will rotatablely move and pass to simultaneously gear I 35, and gear I, II 35,33 eccentric orfice link to each other with connecting rod I, II 37,31 by bearing pin I, II 36,22 respectively; Connecting rod I, II 37,31 the other end link to each other with slide block I, II 23,29 by bearing pin III, IV 32,30 respectively; By this structure rotatablely moving of gear pair eccentric orfice is converted into slide block I, II 23,29 rectilinear motion; Slide block I, II 23,29 are led by slide rail I, II 25,28 respectively, adopt the V-type groove to lead between the two, and slide rail I, II 25,28 are fixed by screw V 27 respectively and between the frame 2; The described accurate gear unit that drives adopts the full symmetric mode to arrange, utilizes slider-crank mechanism dexterously with gear I, II 35,33 rotatablely move and be converted into slide block I, II 23,29 rectilinear motion, and output loads is stable, reliable and symmetrical;
Described detecting unit is made of power sensor 6, laser displacement sensor I, II 5,8, wherein, power sensor 6 two ends are fixedly connected with pressure head 7, frame 2 respectively by connecting thread, laser displacement sensor I, II 5,8 with frame 2 between be fixedly connected with by screw IV 26; Described power sensor 6, laser displacement sensor I, II 5,8 detect respectively the variation of test specimen 10 load and displacement in the three-point bending deformation process;
Described imaging system unit mainly is made of CCD industry imaging lens 12, support I, II 15,11, reversing frame 14, pressing plate 13 and 16 of adjusting knobs, wherein, CCD industry imaging lens 12 is fastened on it between pressing plate 13 and the reversing frame 14 by screw VI 34, can rotate with reversing frame 14; Support I, II 15,11 and frame 2 between fixing by screw III 24, be used for supporting CCD industry imaging lens 12; Can regulate the imaging angle of CCD camera lens by adjusting knob 16; Described imaging system unit by using CCD imaging lens 12 can be observed the phenomenons such as the germinating, expansion of Fine Texture of Material pattern, lattice variations, crackle;
Described Temperature Field Control unit mainly is comprised of resistive heater 9 and temperature controller 4, wherein, temperature controller 4 is a switch that voltage is adjustable, just can regulate easily heating-up temperature to test specimen 10 for the supply voltage of resistive heater 9 by control temperature controller 4, to realize different heating-up temperatures;
Described supplemental support unit mainly is made of frame 2, upper cover plate 1, is fixedly connected with by screw I 17 between upper cover plate 1 and the frame 2; By frame 2 and upper cover plate 1 whole test platform is divided into two relatively independent spaces, can effectively avoids driving, the signal between control assembly and the detecting unit disturbs, the protection motor is not subjected to the impact of resistive heater.
The described accurate slider-crank mechanism of gear unit by classics that drive be gear I, II 35,33 rotatablely move and be converted into dexterously slide block I, II 23,29 rectilinear motion, and then promote test specimen 10 and press to pressure head 7, and deflection deformation occurs; Because pressure head 7 maintains static, test specimen 10 two ends move down under slide block I, II 23,29 effect synchronously, have guaranteed that the height of the central point of test specimen 10 does not change, and are convenient to realize home position observation; And two slider-crank mechanisms taking are arranged symmetrically with, and leave larger space in observation area, test specimen 10 center, are convenient to apply temperature field and in situ imaging camera lens.
Described imaging system unit adopts the solid-state CCD of high multiple industry imaging lens 12 and adjusting mechanism thereof, can be in test process to germinating, the expansion of Fine Texture of Material pattern, lattice variations, crackle
DengPhenomenon is carried out in-situ observation; Rotate adjusting knob 16 and can regulate the view field imaging angle of CCD industry imaging lens 12, guarantee to have preferably imaging visual angle.
Described Temperature Field Control unit carries out contact heating by 9 pairs of test specimens of resistive heater 10, by the supply voltage of temperature controller 5 adjustings to resistive heater 9, test specimen 10 can reach thermal equilibrium under the different supply voltages under different temperature, and then the alternating temperature of finishing test specimen 10 loads.
The T-shaped structure of described frame 2 whole employings, in conjunction with upper cover plate 1 whole test platform is divided into two relatively independent spaces, direct current generator 3, temperature controller 4 and power sensor 6, laser displacement sensor I, II 5,8 separated in both sides, and the large electric current of having avoided direct current generator 3 and temperature controller 4 is to the interference of power sensor 6, laser displacement sensor I, II 5,8 Weak current; Also help simultaneously the heat of resistive heater 9 is separated loading a side, reduce the impact on motor.
Described power sensor 6 two ends are fixedly connected with pressure head 7, frame 2 respectively, adopt two laser displacement sensor I, II 5,8 measure respectively test specimen 10 two ends to bottom offset, two paths of data is averaged, can effectively reduce the winding degree that causes because of the test specimen deflection and test inaccurate problem, this method of testing can obtain preferably test result.
The accurate gear unit that drives provides power by DC servo motor, slows down to increase than accurate worm and gear via big retarding and turns round.The outputting power of worm shaft adopts typical slider-crank mechanism, and rotatablely moving of gear is converted into the rectilinear motion of slide block via eccentric delivery outlet, and then oppresses test specimen generation deflection deformation.The both sides pressure head presses down synchronously and can guarantee that test specimen middle part amount of deflection maximum is not moved, and is easy to realize in-situ observation in the deformation process.Detecting unit comprises power sensor, laser displacement sensor, detects respectively the variation of test specimen load and displacement in bending deformation process.The imaging system unit is reached to prop up by CCD camera lens, rotation of lens governor motion and is configured to the phenomenons such as the germinating of observation Fine Texture of Material pattern that can be real-time, lattice variations, crackle, expansion.The Temperature Field Control unit is comprised of resistive heater, temperature detect switch (TDS), can provide different probe temperatures for the test test specimen by the supply voltage of regulating temperature detect switch (TDS).
To shown in Figure 4, specific works process of the present invention is as follows referring to Fig. 1:
The field, temperature field apply adjustment with the in situ imaging system: before the experiment beginning, open the Temperature Field Control switch, adopt voltage-controlled mode to regulate the size of electric current in the resistive heater 9, by the time the heat that test specimen 10 absorbs from resistance wire when the environment dispersed heat reaches a kind of mobile equilibrium towards periphery, keeps heating voltage constant until finish whole test process.Unclamp the screw VI 34 of pressing plate 13 before the experiment, distance between adjustable lens and test specimen with or image clearly, in test process, the test specimen central point remains constant under the supporting role of pressure head 7, adjust adjusting knob 16 and can realize the adjustment of minute angle, obtain best image effect.
The realization of three-point bending: at first, power is spread out of by direct current generator 3, and drive worm screw 19, worm gear 21 are realized significantly slowing down to increase turning round.Secondly, worm gear 21 with transmission of power to gear I 35, this moment and 33 reverse rotations of gear I 35 pitch wheel II.Gear I, II 35,33 rotatablely move and be delivered on slide block I, the II 23,29 via connecting rod I, II 37,31, slide block I, II 23,29 traveling priority under slide rail I, II 25,28 guide effect, whole mechanism consists of a pair of slider-crank mechanism, the most at last gear I, II 35,33 rotatablely move and be converted into slide block I, II 23,29 rectilinear motion, and then promote test specimen 10 and press to pressure head 7, make test specimen 10 that the deflection deformation of three-point bendings occur.Power sensor 6 and laser displacement sensor I, II 5,8 are sent to the every mechanical property parameters that obtains material in the process computer after the signal that collects is amplified sampling processing in the test process, the simultaneously CCD industry imaging lens 12 real-time test specimen microdeformation image informations with collecting are stored, with the stress of test specimen--and the real-time corresponding material that just can obtain easily of strain curve is based on the in-situ mechanical test parameter of pre-heating degree field.
The above is preferred embodiment of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.All any modifications that the present invention is done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. material mechanical performance original position three-point bending test platform that the test environment temperature is adjustable, it is characterized in that: comprise accurate gear unit, detecting unit, imaging system unit, Temperature Field Control unit, the supplemental support unit of driving, carry out in real time dynamic observation of original position for germinating, the expansion of material microstructure morphology, lattice variations, crackle under the different temperatures field action;
The described accurate gear unit that drives is comprised of direct current generator (3), axle (20), worm screw (19) and worm gear (21), wherein, direct current generator (3) is fastened on the frame (2) by screw II (18), the output shaft of motor (3) and worm screw (19) are connected, and slowing down through worm gear (21) outputs power on the axle (20); Axle (20) driven gear II (33) is rotated, engagement by gear will rotatablely move and pass to simultaneously gear I (35), and the eccentric orfice of gear I, II (35,33) links to each other with connecting rod I, II (37,31) by bearing pin I, II (36,22) respectively; The other end of connecting rod I, II (37,31) links to each other with slide block I, II (23,29) by bearing pin III, IV (32,30) respectively; Rotatablely moving of gear pair eccentric orfice is converted into the rectilinear motion of slide block I, II (23,29) by this structure; Slide block I, II (23,29) are led by slide rail I, II (25,28) respectively, adopt the V-type groove to lead between the two, and slide rail I, II (25,28) are fixed by screw V (27) respectively and between the frame (2); The described accurate gear unit that drives adopts the full symmetric mode to arrange, utilize slider-crank mechanism dexterously rotatablely moving of gear I, II (35,33) to be converted into the rectilinear motion of slide block I, II (23,29), output loads is stable, reliable and symmetrical;
Described detecting unit is made of power sensor (6), laser displacement sensor I, II (5,8), wherein, power sensor (6) two ends are fixedly connected with pressure head (7), frame (2) respectively by connecting thread, are fixedly connected with by screw IV (26) between laser displacement sensor I, II (5,8) and the frame (2); Described power sensor (6), laser displacement sensor I, II (5,8) detect respectively the variation of test specimen (10) load and displacement in the three-point bending deformation process;
Described imaging system unit mainly is made 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 on it between pressing plate (13) and the reversing frame (14) by screw VI (34), can rotate with reversing frame (14); Fixing by screw III (24) between support I, II (15,11) and the frame (2), be used for supporting CCD industry imaging lens (12); Can regulate the imaging angle of CCD camera lens by adjusting knob (16); Described imaging system unit by using CCD imaging lens (12) can be observed germinating, the expansion of Fine Texture of Material pattern, lattice variations, crackle;
Described Temperature Field Control unit mainly is comprised of resistive heater (9) and temperature controller (4), wherein, temperature controller (4) is a switch that voltage is adjustable, just can regulate easily heating-up temperature to test specimen (10) for the supply voltage of resistive heater (9) by control temperature controller (4), to realize different heating-up temperatures;
Described supplemental support unit mainly is made of frame (2), upper cover plate (1), is fixedly connected with by screw I (17) between upper cover plate (1) and the frame (2); By frame (2) and upper cover plate (1) whole test platform is divided into two relatively independent spaces, avoids driving, the signal between control assembly and the detecting unit disturbs, the protection motor is not subjected to the impact of resistive heater.
2. the adjustable material mechanical performance original position three-point bending test platform of test environment temperature according to claim 1, it is characterized in that: the described accurate rectilinear motion that gear unit is converted into rotatablely moving of gear I, II (35,33) by slider-crank mechanism slide block I, II (23,29) that drives, and then promotion test specimen (10) is pressed to pressure head (7), the generation deflection deformation; Because pressure head (7) maintains static, test specimen (10) two ends move down under the effect of slide block I, II (23,29) synchronously, have guaranteed that the height of the central point of test specimen (10) does not change, and are convenient to realize home position observation; And two slider-crank mechanisms taking are arranged symmetrically with, and leave larger space in test specimen (10) observation area, center, are convenient to apply temperature field and in situ imaging camera lens.
3. the adjustable material mechanical performance original position three-point bending test platform of test environment temperature according to claim 1, it is characterized in that: described imaging system unit adopts the solid-state CCD industry imaging lens (12) of high multiple and adjusting mechanism thereof, can germinating, the expansion to Fine Texture of Material pattern, lattice variations, crackle carry out in-situ observation in test process; Rotate adjusting knob (16) and can regulate the view field imaging angle of CCD industry imaging lens (12), guarantee to have preferably imaging visual angle.
4. the adjustable material mechanical performance original position three-point bending test platform of test environment temperature according to claim 1, it is characterized in that: described Temperature Field Control unit carries out contact heating by resistive heater (9) to test specimen (10), by the supply voltage of temperature controller (5) adjusting to resistive heater (9), test specimen (10) can reach thermal equilibrium under the different supply voltages under different temperature, and then the alternating temperature of finishing test specimen (10) loads.
5. the adjustable material mechanical performance original position three-point bending test platform of test environment temperature according to claim 1, it is characterized in that: the T-shaped structure of the whole employing of described frame (2), in conjunction with upper cover plate (1) whole test platform is divided into two relatively independent spaces, with direct current generator (3), temperature controller (4) and power sensor (6), the laser displacement sensor I, II (5,8) separate in both sides, avoided the large electric current of direct current generator (3) and temperature controller (4) to power sensor (6), the laser displacement sensor I, II (5, the interference of Weak current 8); Also help simultaneously the heat of resistive heater (9) is separated loading a side, reduce the impact on motor.
6. the adjustable material mechanical performance original position three-point bending test platform of test environment temperature according to claim 1, it is characterized in that: described power sensor (6) two ends are fixedly connected with pressure head (7), frame (2) respectively, adopt two laser displacement sensor I, II (5,8) measure respectively test specimen (10) two ends to bottom offset, two paths of data is averaged.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN103674728A (en) * | 2013-12-03 | 2014-03-26 | 北京垠海工程技术研究有限责任公司 | Three-point bending force testing machine |
| 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 |
| CN104330299A (en) * | 2014-11-07 | 2015-02-04 | 山东大学 | Mechanical property testing system for soft tissues of tiny organisms and working method of mechanical property testing system |
| CN104330299B (en) * | 2014-11-07 | 2017-03-22 | 山东大学 | Mechanical property testing system for soft tissues of tiny organisms and working method of mechanical property testing system |
| 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 |
| CN107063848B (en) * | 2017-05-11 | 2023-05-12 | 大连理工大学 | Four-point bending loading device in high-temperature pipe and loading method thereof |
| CN107063848A (en) * | 2017-05-11 | 2017-08-18 | 大连理工大学 | Four-point bending loading device and its loading method in high temperature pipe |
| CN107014688B (en) * | 2017-06-09 | 2019-08-06 | 中国科学院新疆理化技术研究所 | A kind of method of home position observation material fracture behaviour |
| CN107014688A (en) * | 2017-06-09 | 2017-08-04 | 中国科学院新疆理化技术研究所 | A kind of method of home position observation Materials Fracture behavior |
| CN107462474A (en) * | 2017-07-31 | 2017-12-12 | 东北大学 | A kind of thin film mechanical performance test device of temperature-controllable |
| CN108051318A (en) * | 2018-02-06 | 2018-05-18 | 沈阳航空航天大学 | A kind of detection method and device of the bending failure temperature of material |
| CN109333162A (en) * | 2018-11-30 | 2019-02-15 | 华中科技大学 | A kind of on-line measurement system and its method of high-speed cutting deformation field |
| CN109333162B (en) * | 2018-11-30 | 2023-07-04 | 华中科技大学 | Online measurement system and method for high-speed cutting deformation field |
| CN110220804A (en) * | 2019-06-17 | 2019-09-10 | 河南交通职业技术学院 | A kind of pressure-shear test machine |
| CN110220804B (en) * | 2019-06-17 | 2024-05-03 | 河南交通职业技术学院 | Pressure shear testing machine |
| CN113358482A (en) * | 2021-06-21 | 2021-09-07 | 重庆交通大学 | Class rock material fracture toughness testing arrangement with test piece retrieves function |
| CN113358482B (en) * | 2021-06-21 | 2023-10-10 | 重庆交通大学 | Rock-like material fracture toughness testing device with test piece recovery function |
| CN116718949A (en) * | 2023-05-30 | 2023-09-08 | 德维嘉汽车电子系统(无锡)有限公司 | Wire harness test system and test method in electrified state |
| CN116718949B (en) * | 2023-05-30 | 2023-12-08 | 德维嘉汽车电子系统(无锡)有限公司 | Wire harness test system and test method in electrified state |
| CN116465766A (en) * | 2023-06-19 | 2023-07-21 | 丹阳市精通眼镜技术创新服务中心有限公司 | Glasses leg toughness detection device |
| CN116465766B (en) * | 2023-06-19 | 2023-09-12 | 丹阳市精通眼镜技术创新服务中心有限公司 | Glasses leg toughness detection device |
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