CN108519291B - High-temperature stretching-fatigue mechanical property tester and method based on electric cylinder driving - Google Patents
High-temperature stretching-fatigue mechanical property tester and method based on electric cylinder driving Download PDFInfo
- Publication number
- CN108519291B CN108519291B CN201810513257.5A CN201810513257A CN108519291B CN 108519291 B CN108519291 B CN 108519291B CN 201810513257 A CN201810513257 A CN 201810513257A CN 108519291 B CN108519291 B CN 108519291B
- Authority
- CN
- China
- Prior art keywords
- temperature
- cavity
- clamp body
- mechanical property
- test
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/38—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by electromagnetic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/005—Electromagnetic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention relates to a high-temperature stretching-fatigue mechanical property tester and a method based on electric cylinder driving, and belongs to the field of mechanical property testing. The test device comprises a mobile platform, a high-temperature module and a test module, wherein the test module is directly driven by an electric cylinder, the intermediate transmission links are few, and the loading of a single tensile load, a single fatigue load and a composite tensile-fatigue load is realized. The high-temperature module adopts a double-cavity high-temperature heating furnace, and the clamp body unit of the testing module can be driven by the mobile platform after the double-cavity high-temperature heating furnace reaches a specified temperature, and enters the heating cavity to perform relevant mechanical property testing so as to meet the testing requirement of specific materials. The structure is simple, the transmission links are few, the measurement accuracy is high, and the influence of the thermal deformation of the clamp on the mechanical property test in the temperature loading process is effectively solved. Provides a new method for revealing the mechanical properties of the material under the coupling action of a temperature field and a composite load, and has important practical significance for guiding future resource exploration, aerospace and the like.
Description
Technical Field
The invention relates to the field of precise scientific instruments in the field of material micromechanics performance test, in particular to a high-temperature stretching-fatigue mechanical performance tester and a method based on electric cylinder driving. The instrument can study the failure mechanism of the material bearing the tensile-fatigue load under the high-temperature condition, and provides a new method for revealing the mechanical property and microstructure evolution behavior of the material under the coupling action of a temperature field and a composite load.
Background
The material is the foundation of national economy and the support and guide of high and new technology. The improvement of the material performance test level is the key for guaranteeing the product performance and the service life. When the material and the product thereof are subjected to alternating load, the load amplitude is far lower than the yield strength or the tensile strength, but the repeated long-term deformation accumulation still finally generates the breaking and destruction behaviors. Practice has shown that the destruction of mechanical parts or structures is mostly caused by fatigue. Due to lack of deep researches on the fatigue failure mechanism and the fatigue micromechanics of the materials, various accidents caused by the fatigue failure of the materials cause huge economic loss due to the difficulty in predictability and great destructiveness. Therefore, development of a fatigue mechanical property testing instrument which can be integrated with an in-situ observation means is urgent.
In addition, the service environment of the material and the product thereof is complex, and the material and the product cannot be subjected to the coupling action of multiple loads and multiple physical fields. Most high-pressure steam boilers, steam turbines, aeroengines and the like are in service for a long time under the high-temperature condition, and at the moment, the design is carried out according to the mechanical parameters measured at normal temperature, so that the safety of the structure is difficult to ensure. Therefore, if a mechanical testing instrument which can provide a real stress condition close to the material and simulate the real environment where the material is positioned is developed in the mechanical property test of the material, the mechanical property of the material under the actual service condition can be obtained more accurately.
The existing high-temperature stretching-fatigue mechanical property testing instrument is generally complex in structure and more in intermediate transmission links, such as a high-temperature in-situ stretching-fatigue testing system designed by 2015, liu Yang and the like and a testing method thereof (CN 104913981A); some high-temperature fatigue devices have small loading force and the heating environment is air, for example, the micro-component high-temperature fatigue performance testing device and method under the composite stress designed and developed by Ma Zhi super et al in 2015 (CN 104677746A); the disadvantages of such a design are: (1) The middle transmission links cause a large error in deformation measurement of the test piece; (2) Heating in air can cause severe oxidation of the test piece; (3) The test piece cannot be subjected to fatigue test in a plastic area due to small loading force, and the use is limited. In addition, the clamp part of most of the existing high-temperature mechanical property testing instruments is heated along with the heating cavity, and the thermal deformation of the clamp can influence the test result.
Disclosure of Invention
The invention aims to provide a high-temperature stretching-fatigue mechanical property tester and a method based on electric cylinder driving, which solve the problems existing in the prior art. The invention has the following characteristics: (1) The middle transmission link is small, and the deformation measurement of the test piece is relatively accurate; (2) the electric cylinder is adopted for driving, so that the fatigue loading force is high; (3) By adopting the double-cavity high-temperature heating furnace, the clamp body can directly extend into a vacuum environment with a specified temperature to perform related mechanical property test. The invention provides an experimental method capable of simulating high-temperature stretching-fatigue of a material in a real service state, which has important significance for revealing microscopic changes of fatigue failure of the material.
The above object of the present invention is achieved by the following technical solutions:
the high-temperature tensile-fatigue mechanical property tester based on electric cylinder driving is horizontally arranged as a whole and comprises a mechanical property testing module, a high-temperature loading module and a moving platform, wherein the mechanical property testing module is arranged on the moving platform, and the moving platform realizes axial movement of the mechanical property testing module; the double-cavity high-temperature heating furnace 7 of the high-temperature loading module is arranged at one side of the mechanical property testing module; after the double-cavity high-temperature heating furnace reaches the set temperature, the clamp body unit with the dynamic performance testing module of the mobile platform enters the high-temperature cavity 22 of the double-cavity high-temperature heating furnace to test the dynamic performance.
The mechanical property testing module comprises an electric cylinder 10, a tension and compression sensor 8, an LVDT displacement sensor 14 and a clamp body unit, wherein the electric cylinder 10 is fixedly connected to a platform I5 through an electric cylinder bracket 9 and directly drives a lower clamp body I18 of the clamp body unit through the tension and compression sensor 8 in a flange connection mode to realize stretching and reciprocating fatigue movement; two sides of the lower clamp body I18 are provided with water nozzles so as to realize circulating water cooling under a high-temperature test; the lower clamp body II 30 of the clamp body unit is fixedly connected to the platform I5 through the clamp body bracket 12, and an O-shaped ring is adopted to seal between the lower clamp body I18 and the clamp body bracket 12; one end of the LVDT displacement sensor 14 is contacted with the extending end 13 of the lower clamp body I, one end of the LVDT displacement sensor is fixedly connected to the platform I5 through the bracket I15, and the tensile displacement of the test piece is indirectly measured by measuring the displacement of the lower clamp body I18; the extending end 13 of the lower clamp body I is fixedly connected to the lower clamp body I18 in a bolt connection mode; the upper clamp bodies I, II 16 and 21 of the clamp body unit are respectively connected with the lower clamp bodies I, II 18 and 30 in a threaded connection mode, so that the test piece is clamped.
The high-temperature loading module has a heating temperature of 1200 ℃, and comprises a double-cavity high-temperature heating furnace 7, a vacuum pump and a water cooling system, wherein the double-cavity high-temperature heating furnace 7 is arranged on a bracket III 2 and consists of a high-temperature cavity 22 and a normal-temperature cavity 25, a clamp body unit is arranged in the normal-temperature cavity 25 in the temperature loading process, and after the high-temperature cavity 22 reaches a set temperature, the clamp body unit moves into the high-temperature cavity 22 for mechanical property test; the normal temperature cavity 25 and the extending end 13 of the lower clamp body I are sealed by an O-shaped ring; the high-temperature cavity 22 is heated by a molybdenum block 29 and is insulated by a tungsten net 26; the tungsten net is fixedly connected to the bottom of the cavity of the high-temperature cavity 22 through a bracket II 28; the temperature inside the high-temperature cavity 22 is measured by a thermocouple 27, the temperature inside the high-temperature cavity 22 is monitored and regulated in real time, and the closed-loop control of the temperature is realized by PID regulation; the bottom of the high temperature cavity 22 is provided with a flange connection port for connecting a vacuum pump; the outer wall of the high temperature chamber 22 is provided with a water tap 24 to realize circulating water cooling under a high temperature test; an observation window 23 is reserved at the top of the high-temperature cavity and integrated with an optical microscope, so that the in-situ mechanical property test is realized.
The mobile platform is driven by a motor 6, and realizes axial movement through a screw rod 3 and a nut pair; the platform I5 is arranged on the guide rail 11 through the sliding block 4, and the whole mechanical property testing module is arranged on the mobile platform, so that axial movement is realized.
The fixture body unit comprises upper fixture bodies I, II 16 and 21, lower fixture bodies I, II 18 and 30, a guide rod 19 and a positioning pin 20, wherein the upper fixture bodies I, II 16 and 21 and the lower fixture bodies I, II 18 and 30 are in profiling design, and grooves are formed in the contact surfaces of the upper fixture bodies I, II 16 and 21 and the lower fixture bodies I, II 18 and 30 and a test piece; the positioning pin 20 is in interference fit with the lower clamp bodies I, II 18 and 30; the guide rod 19 is positioned between the lower clamp bodies I, II 18 and 30, so that the test piece 17 is prevented from generating shearing force in the stretching process; the upper clamp bodies I, II 16 and 21 are fixedly connected with the lower clamp bodies I, II 18 and 30 through bolts.
The movable platform is integrally arranged on the bottom plate 1, the double-cavity high-temperature heating furnace is arranged on the support III 2, and the support III 2 is fixedly connected to the bottom plate 1 in a threaded connection mode.
The invention further aims to provide a high-temperature stretching-fatigue mechanical property testing method based on electric cylinder driving, which adopts a molybdenum rod to realize the loading temperature of room temperature to 1200 ℃ and dynamically monitors the damage mechanism of materials, and comprises the following specific steps:
a. before the experiment starts, the clamp body unit is reset, a pin is used for positioning and fixing a test piece, and the upper clamp bodies I and II are used for clamping the test piece;
b. after the test piece is clamped, starting a motor of the moving platform, and integrally moving the clamp body unit and the test piece into the normal-temperature cavity;
c. after the preparation work is finished, high-temperature loading is carried out: firstly, starting a water cooling system, and carrying out circulating water cooling on the high-temperature cavity and the clamp body unit; starting a vacuum pump, and closing the vacuum pump when the vacuum degree requirement is met; then setting loading temperature and starting a high-temperature cavity heating button;
d. when the high-temperature cavity reaches the designated temperature, adopting a temperature maintaining mode, starting a motor of the mobile platform, feeding the clamp body unit and the test piece in the normal-temperature cavity into the high-temperature cavity, and preserving heat for 2 minutes;
e. after the high-temperature loading is finished, the indicating numbers of the force sensor and the displacement sensor are cleared, the stretching and fatigue test parameters are set according to the test purpose, and the electric cylinder is started to perform mechanical property test;
f. after the test is finished, the inflation valve is opened, so that the air pressure of the double-cavity high-temperature heating furnace is balanced with the outside, the front door is opened, and the test piece is taken out after the temperature in the high-temperature cavity is consistent with the outside temperature.
The invention has the beneficial effects that: the high-temperature tensile-fatigue mechanical property tester based on electric cylinder driving has the advantages of simple structure, less transmission links and high measurement precision, effectively solves the problem of the influence of thermal deformation of the clamp on mechanical property test in the temperature loading process, provides a new method for revealing the mechanical property of materials under the coupling action of a temperature field and a composite load, and has important practical significance for guiding future resource exploration, aerospace and the like.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate and explain the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic view of the overall appearance structure of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is an enlarged view of a portion of the clamp body of the present invention;
FIG. 4 is a schematic view of a dual chamber high temperature heating furnace according to the present invention;
fig. 5 is a flow chart of the operation of the present invention.
In the figure: 1. a bottom plate; 2. a bracket III; 3. a screw rod; 4. a slide block; 5. a platform I; 6. a motor; 7. a high temperature heating furnace; 8. a pull-press sensor; 9. an electric cylinder bracket; 10. an electric cylinder; 11. a guide rail; 12. a clamp body bracket; 13. the extending end of the lower clamp body I; 14. LVDT displacement sensor; 15. a bracket I; 16. an upper clamp body; 17. a test piece; 18. a lower clamp body I; 19. a guide rod; 20. a positioning pin; 21. an upper clamp body; 22. a high temperature chamber; 23. an observation window; 24. a water nozzle; 25. a normal temperature cavity; 26. a tungsten mesh; 27. a thermocouple; 28. a bracket II; 29. a molybdenum block; 30. and a lower clamp body II.
Detailed Description
The details of the present invention and its specific embodiments are further described below with reference to the accompanying drawings.
Referring to fig. 1 to 5, the high-temperature tensile-fatigue mechanical property tester based on electric cylinder driving integrally adopts horizontal arrangement and comprises a mechanical property testing module, a high-temperature loading module and a mobile platform, wherein the mechanical property testing module is arranged on the mobile platform, and the mobile platform realizes axial movement of the mechanical property testing module; the double-cavity high-temperature heating furnace 7 of the high-temperature loading module is arranged at one side of the mechanical property testing module; after the double-cavity high-temperature heating furnace reaches the set temperature, the clamp body unit with the dynamic performance testing module of the mobile platform enters the high-temperature cavity 22 of the double-cavity high-temperature heating furnace to carry out relevant mechanical performance testing.
Referring to fig. 1 and 2, the mechanical performance testing module includes an electric cylinder 10, a tension-compression sensor 8, an LVDT displacement sensor 14 and a clamp body unit, where the electric cylinder 10 is fixedly connected to a platform i 5 through an electric cylinder bracket 9, and directly drives a lower clamp body i 18 of the clamp body unit to implement tension and reciprocating fatigue motion through the tension-compression sensor 8 in a flange connection manner; two sides of the lower clamp body I18 are provided with water nozzles so as to realize circulating water cooling under a high-temperature test; the lower clamp body II 30 of the clamp body unit is fixedly connected to the platform I5 through the clamp body bracket 12, and an O-shaped ring is adopted to seal between the lower clamp body I18 and the clamp body bracket 12; one end of the LVDT displacement sensor 14 is contacted with the extending end 13 of the lower clamp body I, one end of the LVDT displacement sensor is fixedly connected to the platform I5 through the bracket I15, and the tensile displacement of the test piece is indirectly measured by measuring the displacement of the lower clamp body I18; the extending end 13 of the lower clamp body I is fixedly connected to the lower clamp body I18 in a bolt connection mode; the upper clamp bodies I, II 16 and 21 of the clamp body unit are respectively connected with the lower clamp bodies I, II 18 and 30 in a threaded connection mode, so that the test piece is clamped.
Referring to fig. 1 and 4, the heating temperature of the high-temperature loading module can reach 1200 ℃, the high-temperature loading module comprises a double-cavity high-temperature heating furnace 7, a vacuum pump and a water cooling system, the double-cavity high-temperature heating furnace 7 is arranged on a bracket iii 2 and consists of a high-temperature cavity 22 and a normal-temperature cavity 25, a clamp body unit is arranged in the normal-temperature cavity 25 in the temperature loading process, and after the high-temperature cavity 22 reaches a set temperature, the clamp body unit moves into the high-temperature cavity 22 to perform related mechanical property test; the normal temperature cavity 25 and the extending end 13 of the lower clamp body I are sealed by an O-shaped ring; the high-temperature cavity 22 is heated by a molybdenum block 29 and is insulated by a tungsten net 26; the tungsten net is fixedly connected to the bottom of the cavity of the high-temperature cavity 22 through a bracket II 28; the temperature inside the high-temperature cavity 22 is measured by a thermocouple 27, and forms closed-loop feedback with a heating system, so that the temperature inside the high-temperature cavity 22 is monitored and regulated in real time, and the closed-loop control of the temperature is realized by PID regulation; the bottom of the high temperature cavity 22 is provided with a flange connection port for connecting a vacuum pump; the outer wall of the high temperature chamber 22 is provided with a water tap 24 to realize circulating water cooling under a high temperature test; an observation window 23 is reserved at the top of the high-temperature cavity and integrated with an optical microscope, so that the in-situ mechanical property test is realized.
Referring to fig. 1 and 2, the moving platform is driven by a motor 6 to realize axial movement through a screw rod 3 and a nut pair; the platform I5 is arranged on the guide rail 11 through the sliding block 4, and the whole mechanical property testing module is arranged on the mobile platform, so that axial movement is realized.
Referring to fig. 3, the clamp body unit includes upper clamp bodies i, ii 16, 21, lower clamp bodies i, ii 18, 30, a guide rod 19 and a positioning pin 20, where the upper clamp bodies i, ii 16, 21 and the lower clamp bodies i, ii 18, 30 are profiled, and a groove is formed on a contact surface of the upper clamp bodies i, ii 16, 21 and the lower clamp bodies i, ii 18, 30 to increase friction; the positioning pin 20 is in interference fit with the lower clamp bodies I, II 18 and 30 to play a role in positioning so as to ensure that the test piece is strictly coaxial with the loading shaft; the guide rod 19 is positioned between the lower clamp bodies I, II 18 and 30 and plays a guiding role to prevent the test piece 17 from generating shearing force in the stretching process; the upper clamp bodies I, II 16 and 21 are fixedly connected with the lower clamp bodies I, II 18 and 30 through bolts.
Referring to fig. 1, the whole mobile platform is arranged on a bottom plate 1, a double-cavity high-temperature heating furnace is arranged on a bracket III 2, and the bracket III 2 is fixedly connected to the bottom plate 1 in a threaded connection mode.
The heating furnace of the high-temperature stretching-fatigue mechanical property tester based on the electric cylinder driving adopts double cavities, effectively solves the problem that the thermal deformation of the clamp has influence on the mechanical property test in the temperature loading process, and has higher measurement precision.
Referring to fig. 1 to 5, before the electric cylinder driving-based high-temperature tensile-fatigue mechanical property tester is installed, the force sensor displacement sensors i, ii, iii and iv are firstly required to be calibrated and calibrated, and then the installation and the debugging of the tester are carried out. After each experiment is finished, the clamp body unit must be returned to the original position so as to clamp the test piece for the next experiment.
The test method of the high-temperature tensile-fatigue mechanical property tester based on electric cylinder driving adopts a molybdenum rod to realize the loading temperature of room temperature to 1200 ℃ and dynamically monitors the damage mechanism of the material, and comprises the following specific steps:
a. before the experiment starts, the clamp body unit is reset, a pin is used for positioning and fixing a test piece, and the upper clamp bodies I and II are used for clamping the test piece;
b. after the test piece is clamped, starting a motor of the moving platform, and integrally moving the clamp body unit and the test piece into the normal-temperature cavity;
c. after the preparation work is finished, high-temperature loading is carried out: firstly, starting a water cooling system, and carrying out circulating water cooling on the high-temperature cavity and the clamp body unit; starting a vacuum pump, and closing the vacuum pump when the vacuum degree requirement is met; then setting loading temperature and starting a high-temperature cavity heating button;
d. when the high-temperature cavity reaches the designated temperature, adopting a temperature maintaining mode, starting a motor of the mobile platform, feeding the clamp body unit and the test piece in the normal-temperature cavity into the high-temperature cavity, and preserving heat for 2 minutes;
e. after the high-temperature loading is finished, the indicating numbers of the force sensor and the displacement sensor are cleared, relevant tensile and fatigue test parameters are set according to the test purpose, and the electric cylinder is started to perform relevant mechanical property test;
f. after the test is finished, the inflation valve is opened, so that the air pressure of the double-cavity high-temperature heating furnace is balanced with the outside, the front door is opened, and the test piece is taken out after the temperature in the high-temperature cavity is consistent with the outside temperature.
The test module is directly driven by the electric cylinder, has few intermediate transmission links, and realizes the loading of single tensile and fatigue loads and composite tensile and fatigue loads. The high-temperature module adopts a double-cavity high-temperature heating furnace, and the clamp part of the testing module can be driven by the mobile platform after the double-cavity high-temperature heating furnace reaches the specified temperature, and enters the heating cavity to perform relevant mechanical property testing so as to meet the testing requirement of specific materials. The invention has simple structure, less transmission links and high measurement precision, and effectively solves the problem that the thermal deformation of the clamp has an influence on the mechanical property test in the temperature loading process. Provides a new method for revealing the mechanical properties of the material under the coupling action of a temperature field and a composite load, and has important practical significance for guiding future resource exploration, aerospace and the like.
The mechanical properties of the material are mainly represented by deformation, damage performance and the like of the material under the action of load, and parameters such as elastic modulus, breaking limit, fatigue strength and the like of the material are the most main test objects in the mechanical property test of the material. And the material tends to show mechanical properties which are quite different from those of the material at normal temperature under the high-temperature condition. The plasticity of the metal is increased under the action of high-temperature short-time load, but the plasticity is obviously reduced under the high-temperature long-time load; in addition, the combined effect of temperature and time also affects the fracture path of the metal material. Therefore, the research on the mechanical properties of the material under the force thermal coupling has practical significance and application value. The invention provides a high-temperature tensile-fatigue mechanical property testing instrument, which has important significance for revealing the damage mechanism of materials under the action of high temperature and complex load.
The above description is only a preferred example of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides a high temperature tensile-fatigue mechanical properties tester based on electronic jar drive which characterized in that: the whole device is horizontally arranged and comprises a mechanical property testing module, a high-temperature loading module and a mobile platform, wherein the mechanical property testing module is arranged on the mobile platform, and the mobile platform realizes axial movement of the mechanical property testing module; the double-cavity high-temperature heating furnace (7) of the high-temperature loading module is arranged at one side of the mechanical property testing module; after the double-cavity high-temperature heating furnace reaches the set temperature, the moving platform is provided with a clamp body unit of a dynamic performance testing module, and the clamp body unit enters a high-temperature cavity (22) of the double-cavity high-temperature heating furnace to test the dynamic performance;
the mechanical property testing module comprises an electric cylinder (10), a tension-compression sensor (8), an LVDT displacement sensor (14) and a clamp body unit, wherein the electric cylinder (10) is fixedly connected to a platform I (5) through an electric cylinder bracket (9) and directly drives a lower clamp body I (18) of the clamp body unit through the tension-compression sensor (8) in a flange connection mode to realize stretching and reciprocating fatigue movement; two sides of the lower clamp body I (18) are provided with water nozzles so as to realize circulating water cooling under a high-temperature test; the lower clamp body II (30) of the clamp body unit is fixedly connected to the platform I (5) through the clamp body bracket (12), and an O-shaped ring is adopted to seal between the lower clamp body I (18) and the clamp body bracket (12); one end of the LVDT displacement sensor (14) is contacted with the extending end (13) of the lower clamp body I, one end of the LVDT displacement sensor is fixedly connected to the platform I (5) through the bracket I (15), and the tensile displacement of the test piece is indirectly measured by measuring the displacement of the lower clamp body I (18); the lower clamp body I extending end (13) is fixedly connected to the lower clamp body I (18) in a bolt connection mode; the upper clamp bodies I and II (16 and 21) of the clamp body unit are respectively connected with the lower clamp bodies I and II (18 and 30) in a threaded connection mode, so that the test piece is clamped;
the high-temperature loading module has a heating temperature of 1200 ℃, and comprises a double-cavity high-temperature heating furnace (7), a vacuum pump and a water cooling system, wherein the double-cavity high-temperature heating furnace (7) is arranged on a bracket III (2) and consists of a high-temperature cavity (22) and a normal-temperature cavity (25), a clamp body unit is arranged in the normal-temperature cavity (25) in the temperature loading process, and after the high-temperature cavity (22) reaches a set temperature, the clamp body unit moves into the high-temperature cavity (22) to perform mechanical property test; the normal temperature cavity (25) and the extending end (13) of the lower clamp body I are sealed by an O-shaped ring; the high-temperature cavity (22) is heated by adopting a molybdenum block (29), and is insulated by adopting a tungsten net (26); the tungsten net is fixedly connected to the bottom of the high-temperature cavity (22) through a bracket II (28); the temperature inside the high-temperature cavity (22) is measured through a thermocouple (27), the temperature inside the high-temperature cavity (22) is monitored and regulated in real time, and the closed-loop control of the temperature is realized through PID regulation; the bottom of the high temperature cavity (22) is provided with a flange connection port for connecting a vacuum pump; the outer wall of the high temperature cavity (22) is provided with a water tap (24) to realize circulating water cooling under a high temperature test; an observation window (23) is reserved at the top of the high-temperature cavity and integrated with an optical microscope, so that the in-situ mechanical property test is realized.
2. The electric cylinder drive-based high-temperature tensile-fatigue mechanical property tester according to claim 1, wherein: the mobile platform is driven by a motor (6) and axially moves through a screw rod (3) and a nut pair; the platform I (5) is arranged on the guide rail (11) through the sliding block (4), and the whole mechanical property testing module is arranged on the movable platform, so that axial movement is realized.
3. The electric cylinder drive-based high-temperature tensile-fatigue mechanical property tester according to claim 1, wherein: the fixture body unit comprises upper fixture bodies I, II (16, 21), lower fixture bodies I, II (18, 30), guide rods (19) and positioning pins (20), wherein the upper fixture bodies I, II (16, 21) and the lower fixture bodies I, II (18, 30) adopt profiling design, and grooves are formed in the contact surfaces of the upper fixture bodies I, II, 18, 30 and a test piece; the locating pin (20) is in interference fit with the lower clamp bodies I and II (18 and 30); the guide rod (19) is positioned between the lower clamp bodies I, II (18, 30) to prevent the test piece (17) from generating shearing force in the stretching process; the upper clamp bodies I and II (16 and 21) are fixedly connected with the lower clamp bodies I and II (18 and 30) through bolts.
4. The electric cylinder drive-based high-temperature tensile-fatigue mechanical property tester according to claim 1, wherein: the movable platform is integrally arranged on the bottom plate (1), the double-cavity high-temperature heating furnace is arranged on the support III (2), and the support III (2) is fixedly connected to the bottom plate (1) in a threaded connection mode.
5. A high temperature stretch-fatigue mechanical property testing method realized by the electric cylinder drive-based high temperature stretch-fatigue mechanical property tester according to any one of claims 1-4, characterized in that: the molybdenum rod is adopted to realize the loading temperature from room temperature to 1200 ℃, and the damage mechanism of the material is dynamically monitored, and the specific steps are as follows:
a. before the experiment starts, the clamp body unit is reset, a pin is used for positioning and fixing a test piece, and the upper clamp bodies I and II are used for clamping the test piece;
b. after the test piece is clamped, starting a motor of the moving platform, and integrally moving the clamp body unit and the test piece into the normal-temperature cavity;
c. after the preparation work is finished, high-temperature loading is carried out: firstly, starting a water cooling system, and carrying out circulating water cooling on the high-temperature cavity and the clamp body unit; starting a vacuum pump, and closing the vacuum pump when the vacuum degree requirement is met; then setting loading temperature and starting a high-temperature cavity heating button;
d. when the high-temperature cavity reaches the designated temperature, adopting a temperature maintaining mode, starting a motor of the mobile platform, feeding the clamp body unit and the test piece in the normal-temperature cavity into the high-temperature cavity, and preserving heat for 2 minutes;
e. after the high-temperature loading is finished, the indicating numbers of the force sensor and the displacement sensor are cleared, the stretching and fatigue test parameters are set according to the test purpose, and the electric cylinder is started to perform mechanical property test;
f. after the test is finished, the inflation valve is opened, so that the air pressure of the double-cavity high-temperature heating furnace is balanced with the outside, the front door is opened, and the test piece is taken out after the temperature in the high-temperature cavity is consistent with the outside temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810513257.5A CN108519291B (en) | 2018-05-25 | 2018-05-25 | High-temperature stretching-fatigue mechanical property tester and method based on electric cylinder driving |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810513257.5A CN108519291B (en) | 2018-05-25 | 2018-05-25 | High-temperature stretching-fatigue mechanical property tester and method based on electric cylinder driving |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108519291A CN108519291A (en) | 2018-09-11 |
| CN108519291B true CN108519291B (en) | 2023-07-04 |
Family
ID=63427484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810513257.5A Active CN108519291B (en) | 2018-05-25 | 2018-05-25 | High-temperature stretching-fatigue mechanical property tester and method based on electric cylinder driving |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108519291B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109580377A (en) * | 2018-11-28 | 2019-04-05 | 北京林业大学 | A kind of rubber tensile experimental bench and rubber fatigue test method |
| CN109580333A (en) * | 2018-12-19 | 2019-04-05 | 浙江浙能技术研究院有限公司 | A kind of high temperature stress oxidation test macro |
| CN110715862A (en) * | 2019-11-13 | 2020-01-21 | 吉林大学 | Instrument and method for testing mechanical properties of material under tension-torsion composite-force-heat coupling working condition |
| CN111337363B (en) * | 2020-03-30 | 2022-04-05 | 哈尔滨工程大学 | Device and method for testing performance of thermoelectric material |
| CN113820215A (en) * | 2021-08-20 | 2021-12-21 | 北京工业大学 | Ultra-high temperature resistant fatigue test clamping device |
| CN113640159B (en) * | 2021-08-24 | 2023-11-10 | 安徽省汉博科技有限公司 | Fatigue strength testing device for furniture node connection part |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101907395A (en) * | 2010-09-08 | 2010-12-08 | 北京科技大学 | Double-hearth high temperature smelting furnace |
| CN103868357A (en) * | 2014-03-12 | 2014-06-18 | 中国航空工业集团公司北京航空材料研究院 | Plate sample fatigue test heating furnace |
| CN104913981A (en) * | 2015-05-12 | 2015-09-16 | 吉林大学 | High-temperature in situ tension-fatigue test system and test method thereof |
| WO2017107362A1 (en) * | 2015-12-23 | 2017-06-29 | 吉林大学 | Material property testing apparatus and method for in situ combined mechanical, electrical, thermal, and magnetic testing in composite load mode |
| WO2017132414A1 (en) * | 2016-01-28 | 2017-08-03 | Coe William B | Rolling cyclic fatigue test platform for determining asphalt ductility |
| CN108051215A (en) * | 2018-02-01 | 2018-05-18 | 中国人民解放军海军航空大学 | High speed roller bearing machinery loading device synchronous with thermal force and method |
-
2018
- 2018-05-25 CN CN201810513257.5A patent/CN108519291B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101907395A (en) * | 2010-09-08 | 2010-12-08 | 北京科技大学 | Double-hearth high temperature smelting furnace |
| CN103868357A (en) * | 2014-03-12 | 2014-06-18 | 中国航空工业集团公司北京航空材料研究院 | Plate sample fatigue test heating furnace |
| CN104913981A (en) * | 2015-05-12 | 2015-09-16 | 吉林大学 | High-temperature in situ tension-fatigue test system and test method thereof |
| WO2017107362A1 (en) * | 2015-12-23 | 2017-06-29 | 吉林大学 | Material property testing apparatus and method for in situ combined mechanical, electrical, thermal, and magnetic testing in composite load mode |
| WO2017132414A1 (en) * | 2016-01-28 | 2017-08-03 | Coe William B | Rolling cyclic fatigue test platform for determining asphalt ductility |
| CN108051215A (en) * | 2018-02-01 | 2018-05-18 | 中国人民解放军海军航空大学 | High speed roller bearing machinery loading device synchronous with thermal force and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108519291A (en) | 2018-09-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108519291B (en) | High-temperature stretching-fatigue mechanical property tester and method based on electric cylinder driving | |
| CN107607390B (en) | Variable-temperature tension-torsion composite load material mechanical property in-situ test device and method | |
| US11635359B2 (en) | Instrument and method for mechanical properties in situ testing of materials under high temperature and complex mechanical loads | |
| CN106248557B (en) | Rock tension and compression ring shear seepage coupling rheological tester | |
| CN107607409B (en) | Ultra-high temperature complex load biaxial stretching compression testing device | |
| CN102331370B (en) | In-situ high-frequency fatigue material mechanical test platform under scanning electron microscope based on stretching/compressing mode | |
| CN103512803A (en) | Multi-load and multi-physics coupling material micromechanical performance in-situ testing instrument | |
| CN203551383U (en) | In-situ testing instrument for micromechanical property of material under multi-load and multi-physical field coupling action | |
| CN104990822A (en) | Reciprocating type friction wear testing machine | |
| KR20110085610A (en) | Greater oil pressure cylinder test system | |
| CN110441163B (en) | High-temperature ultrasonic fatigue in-situ test instrument and test method | |
| CN106289962B (en) | In-situ test system capable of observing deformation and damage of sample gauge length section in high-low power on-line manner | |
| CN202305330U (en) | Mechanics testing platform for in-situ high frequency fatigue materials under scanning electron microscope based on stretching/compressing mode | |
| WO2023109454A1 (en) | Variable-temperature fatigue test device | |
| CN108132189B (en) | High-temperature in-situ double-shaft loading testing device under continuous variable temperature | |
| KR100915790B1 (en) | stress - strain measuring apparatus using bellows structure | |
| CN108507882A (en) | Material mechanical property in-situ test equipment for neutron scattering analysis | |
| CN102269675B (en) | Biaxial tensile testing device with thirdly directional stress provided by fluid pressure and application thereof | |
| CN104634682A (en) | Cylinder sleeve piston ring friction pair abrasion test machine | |
| CN111504800B (en) | Multifunctional micro-sample testing system and method, petrochemical industry and nuclear power equipment | |
| CN204389102U (en) | Dual force source superposing type multi-dimension force sensor calibrating installation | |
| CN208847614U (en) | Driving type piezoelectric actuator low-temperature in-site high-frequency reciprocating micro-moving frictional wear test platform | |
| CN210347362U (en) | Compensator constant pressure fatigue testing machine | |
| CN214200970U (en) | Tensile/compression-bending mechanical test platform capable of carrying out environmental simulation loading | |
| CN112763315A (en) | Tensile/compression-bending mechanical testing device capable of carrying out environmental simulation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |