CN204718898U - High-temp in-situ stretching-fatigue test system - Google Patents
High-temp in-situ stretching-fatigue test system Download PDFInfo
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- CN204718898U CN204718898U CN201520302780.5U CN201520302780U CN204718898U CN 204718898 U CN204718898 U CN 204718898U CN 201520302780 U CN201520302780 U CN 201520302780U CN 204718898 U CN204718898 U CN 204718898U
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- GALOTNBSUVEISR-UHFFFAOYSA-N molybdenum;silicon Chemical compound [Mo]#[Si] GALOTNBSUVEISR-UHFFFAOYSA-N 0.000 claims description 10
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
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Abstract
The utility model relates to a kind of high-temp in-situ stretching-fatigue test system, belongs to scientific instrument and Material Testing Technology field.Test macro comprises tensile loads and detecting unit, fatigue loading and detecting unit, in-situ observation unit, high temperature load and detecting unit etc.Wherein tensile loads and detecting unit provide power by motor, and being slowed down by worm and gear, ball-screw realizes semi-static load; Order about flexible hinge by piezoelectric ceramics and realize the medium and low frequency to-and-fro movement upwards of test specimen tensile axis, realize fatigue loading; By optical microscope, dynamic monitoring is carried out to test process, realize in-situ observation.This test principle is reliable, has important scientific meaning and good using value, can the mechanical property of material for test and the correlativity rule of microstructure and deformation damage mechanism under testing and analysis hot environment accurately.
Description
Technical Field
The utility model relates to a scientific instrument and material test technical field, in particular to tensile-fatigue test system of high temperature normal position. The method is used for accurately detecting the mechanical property of the test piece in the high-temperature environment and the correlation rule of the microstructure and the deformation damage mechanism of the test piece.
Background
The application of the in-situ testing technology plays a role in promoting the development of materials science, and during the material testing process, instruments such as an optical microscope and the like are used for dynamically monitoring the micro deformation damage of the material under the action of load in the whole process, so that the micro mechanical behaviors, the damage mechanism and the correlation rule between the material performance and the load of various materials and products thereof can be further disclosed.
It is well known that the mechanical properties of a material generally change as a result of the combined action of the temperature and stress fields in which it is exposed. Particularly, with the rapid development of high-technology industries such as aerospace, microelectronics and the like, new requirements for the performance of materials are provided by the industry, so that the research on the mechanical property evolution mechanism of the materials under the multi-field coupling conditions such as a temperature field, a mechanical field and the like is very important. The tensile fatigue test with controllable temperature can realize the accurate test of the micro-mechanical property of the material under different temperatures, different tensile loads and different fatigue loads, and has a practical significance for analyzing the mechanical property and the denaturation damage mechanism of the material under the high-temperature condition and the composite load mode.
At present, the existing high-temperature stretching device cannot carry out stretching-fatigue composite load testing in a high-temperature environment and cannot dynamically monitor the whole process of microscopic deformation damage of a material under the action of a load, so that the development of a high-temperature in-situ stretching-fatigue testing system has important significance for researching the mechanical property of the material under the stretching-fatigue composite load and the deformation damage mechanism of the material under different temperature fields.
Disclosure of Invention
An object of the utility model is to provide a tensile-fatigue test system of high temperature normal position has solved the above-mentioned problem that prior art exists. The utility model discloses a temperature regulation realizes carrying out unipolar drawing or tensile-fatigue test of unipolar at high temperature 500 ℃ -1700 ℃ within range to combine optical microscope to observe in real time the mechanical properties test process of material, if carry out the normal position monitoring to the crack initiation of material, crack propagation and the inefficacy destruction process of material, realize the normal position test. In addition, through the acquisition of signals such as tensile force borne by a test piece, tensile deformation of the test piece and the like in the test process by the mechanical and deformation signal detection unit, the stress-strain history of the tested material under the action of corresponding load can be fitted, and further the micro-mechanical behavior and the deformation damage mechanism of the material under the action of high-temperature environment and tensile-fatigue load are deeply researched. The application of the variable temperature field is realized by a high-temperature furnace, a high-temperature environment is provided by the silicon-molybdenum rod, and the temperature is adjusted by a control system. The device can be integrated in a vacuum cavity to realize the tensile-fatigue test of the micromechanical property of the material under the vacuum condition or the high temperature in a special gas environment.
The above object of the utility model is realized through following technical scheme:
the high-temperature in-situ tensile-fatigue test system comprises a tensile loading and detection unit, a fatigue loading and detection unit, an in-situ observation unit, a high-temperature loading and detection unit and a whole horizontal arrangement, wherein the tensile loading and detection unit and the fatigue loading and detection unit are respectively arranged on two sides of a high-temperature furnace, the directions of the tensile loading and the fatigue loading are on the same axis, the tensile loading and detection unit and the fatigue loading and detection unit are arranged on a base 14, and the in-situ observation unit is arranged above the high-temperature loading and detection unit and is arranged on the base 14 through a support 1.
The tensile loading and detecting unit is powered by a servo motor 12, and applies tensile load to the test piece through a worm wheel II 9, a worm II 10, a worm wheel I5, a worm I7, a screw 28 and a nut 27; the servo motor 12 is arranged on the base 14 through the motor base 11, and the worm I7 is arranged on an output shaft of the motor; the worm wheel II 9 and the worm I7 are arranged on the shaft 31, and the shaft is arranged on the base 14 through the bearing I30, the bearing seat I6, the bearing II 32 and the bearing seat II 8; the worm wheel I5 is arranged on the screw rod 28, and the screw rod 28 is arranged on the bottom plate 29 through a screw rod seat 42; the nut 27 is arranged on the nut seat 3, the nut seat 3 is respectively arranged on the guide rail Ia 25 and the guide rail Ib 33 through the sliding block Ib 24 and the sliding block Ib 34, and the guide rail Ia 25 and the guide rail Ib 33 are arranged on the bottom plate 29; two ends of the tension sensor 13 are respectively connected with the nut seat 3 and the clamp body 2, and the clamp body 2 is respectively arranged on the guide rail Ia 25 and the guide rail Ib 33 through a slide block Ia 23 and a slide block Id 35; the displacement sensor I4 adopts a separated LVDT, the main body part of the sensor is arranged on a bottom plate I29, the iron core of the sensor is arranged on a top plate I22 through threads, the top plate I22 is arranged on the fixture body 2, and the bottom plate 29 is fixed on the base 14 through a supporting block I26.
The fatigue loading and detecting unit comprises a flexible hinge 18, piezoelectric ceramics 19, a clamp body II 41 and a displacement sensor II 20, wherein the piezoelectric ceramics 19 is arranged in the flexible hinge 18, the fixed end of the flexible hinge 18 is fixed on a base plate II 17 through a screw, the movable end of the flexible hinge 18 is connected with the clamp body II 41, the clamp body II 41 is respectively arranged on a guide rail II a38 and a guide rail II b44 through a slide block II 37 and a slide block II 45, and the guide rail II a38 and the guide rail II b44 are arranged on the base plate II 17; the displacement sensor II 20 is arranged on the bottom plate II 17 and used for measuring the displacement of the clamp body II 41 during fatigue testing; the bottom plate II 17 is fixed on the base 14 through a supporting block II 15.
The in-situ observation unit comprises an optical microscope 21 and a support 1, wherein the working distance of the optical microscope 21 is large enough, the surface to be observed of the test piece is covered by a window 46 above the high-temperature furnace, and the position of the optical microscope 21 is adjusted by the support 1.
The in-situ observation unit can select an optical microscope to monitor the initiation, expansion and fracture processes of the crack of the test piece in the high-temperature environment according to different observation purposes; a Raman spectrometer can be selected to carry out micro-area detection on the surface of the test piece, and phase structure research, crystal grain and crystal boundary change, crack initiation and the like of the high-temperature resistant material are carried out; an X-ray diffractometer can be selected to perform phase analysis on a test piece, determine the grain size and stress distribution, study the relation between the special properties of the material and the atomic arrangement and crystal phase change of the material, and the like; or selecting a thermal infrared imager to check the material defects and the like; some observation devices can be used together, such as an optical microscope and a raman spectrometer. The test condition in the high-temperature furnace can be checked through the window 46, and the condition of the surface of the test piece at different temperatures can be observed by using an optical microscope; and a proper window can be processed on the high-temperature furnace according to the requirements of emitting corresponding laser, X-ray and the like into the high-temperature furnace through the window according to the requirements of a Raman spectrometer, an X-ray diffractometer, an infrared thermal imager and the like.
The high-temperature loading and detecting unit comprises a high-temperature furnace 16 and a control system thereof, wherein a heating element of the high-temperature furnace 16 is a silicon-molybdenum rod, the silicon-molybdenum rod is powered to generate heat, the high-temperature silicon-molybdenum rod enables the temperature in the furnace cavity to rise rapidly through radiation, the temperature of the inner cavity of the high-temperature furnace can reach 1700 ℃, the temperature of the outer surface of the high-temperature furnace can be maintained at room temperature through water cooling, and a thermocouple is arranged in the inner cavity of the high-temperature furnace and used for monitoring the actual temperature of the inner cavity of the high-temperature furnace; the high temperature furnace 16 is provided with a corresponding control cabinet for controlling the temperature of the inner cavity of the high temperature furnace.
The high-temperature loading and detecting unit can select different heating modes according to different requirements, for example, resistance wires, silicon-carbon rods and silicon-molybdenum rods can be selected as heating elements in the high-temperature furnace according to different required temperatures and types of the high-temperature furnace, or infrared halogen lamps are matched with spherical reflectors to manufacture more concentrated high-heat flow areas.
The clamp body I2 is connected with the pressure plate I36 through a screw, and a test piece is clamped through screwing the screw; a groove is processed in the clamp body I2 and used for positioning a test piece; knurling is processed on the clamp body I2 and the pressing plate I36 to guarantee the reliability of clamping.
The clamp body II 41 is connected with the pressure plate II 40 through a screw, and the test piece is clamped through screwing the screw; a groove is processed on the fixture body II 41 and used for positioning a test piece; knurling is processed on the clamp body II 41 and the pressing plate II 40 to guarantee clamping reliability.
Along with the change of temperature, the elastic-plastic deformation ability of material all takes place certain change, according to the utility model discloses a test system can study the change law of different materials mechanics performance under the different temperatures, if there is obvious temperature softening effect etc. to the sensitivity of temperature, strain rate like stress. The utility model discloses can integrate in the vacuum chamber, realize the tensile-fatigue test of high temperature normal position under vacuum environment or the special gas environment, can selectively avoid the oxidation scheduling problem of test piece.
The beneficial effects of the utility model reside in that: the testing system is reliable in principle, simple and compact in structure, and can accurately detect the micromechanical performance and the denaturation damage mechanism of the material and the product thereof in the high-temperature environment under the action of a stretching-fatigue loading mode. The test system can observe the test process in real time by means of a part of optical microscopes, so that in-situ observation is realized. To sum up, the utility model discloses not only have good scientific research using value, have the significance to the development of normal position test technique and device, the progress of material micromechanics performance research moreover.
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 example embodiments of the invention and together with the description serve to explain the invention without limitation.
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a control schematic block diagram of the present invention;
FIG. 3 is a schematic structural view of the tensile loading and detecting unit of the present invention;
FIG. 4 is a schematic structural view of a fatigue loading and detecting unit according to the present invention;
fig. 5 is a schematic view of a part of the structure of the testing system of the present invention;
FIG. 6 is a schematic diagram of a testing system according to the present invention;
FIG. 7 is a schematic diagram of in situ observation of the relative position of a test piece and a microscope before testing;
FIG. 8 is a schematic diagram of in situ observation of the relative position of the test piece and the microscope after testing.
In the figure: 1. a support; 2. a clamp body I; 3. a nut seat; 4. a displacement sensor I; 5. a worm gear I; 6. a bearing seat I; 7. a worm I; 8. a bearing seat II; 9. a worm gear II; 10. a worm II; 11. a motor base; 12. a servo motor; 13. a tension sensor; 14. a base; 15. a supporting block II; 16. a high temperature furnace; 17. a bottom plate II; 18. a flexible hinge; 19. piezoelectric ceramics; 20. a displacement sensor II; 21. an optical microscope; 22. a top plate I; 23. a slide block Ia; 24. a sliding block Ib; 25. a guide rail Ia; 26. a supporting block I; 27. a nut; 28. a lead screw; 29. a bottom plate I; 30. a bearing I; 31. a shaft; 32, a bearing II; 33. a guide rail Ib; 34. a slide block ic; 35. a sliding block id; 36. pressing a block I; 37. a slide block IIa; 38. a guide rail IIa; 39. a top plate II; 40. pressing a plate II; 41. a clamp body II; 42. a lead screw seat; 43. a stop block III; 44. a guide rail IIb; 45. a slide block IIb; 46. a window; 47. a stop block I; 48. and a stop block II.
Detailed Description
The details of the present invention and its embodiments are further described below with reference to the accompanying drawings.
Referring to fig. 1 to 8, the utility model discloses a tensile-fatigue test system in high temperature normal position, including tensile loading and detecting element, tired loading and detecting element, normal position observation unit, high temperature loading and detecting element etc. the device level is arranged, and wherein tensile loading and detecting element, tired loading and detecting element install respectively in the both sides of high temperature furnace, and tensile loading and tired loaded direction are on same axis. The uniaxial tension-fatigue mechanical property test of the material is realized under the thermal field with the adjustable temperature of 500-1700 ℃, and the whole-process dynamic monitoring of the microscopic deformation damage of the material under the load action is realized based on the optical microscope.
Referring to fig. 3, the tensile loading and detecting unit of the present invention is powered by a servo motor 12, and applies tensile load to the test piece through a worm gear ii 9, a worm gear ii 10, a worm gear i 5, a worm i 7, a lead screw 28, and a nut 27; the servo motor 12 is arranged on the base 14 through the motor base 11, and the worm I7 is arranged on an output shaft of the motor; the worm wheel II 9 and the worm I7 are arranged on the shaft 31, and the shaft is arranged on the base 14 through the bearing I30, the bearing seat I6, the bearing II 32 and the bearing seat II 8; the worm wheel I5 is arranged on the screw rod 28, and the screw rod 28 is arranged on the bottom plate 29 through a screw rod seat 42; the nut 27 is arranged on the nut seat 3, the nut seat 3 is respectively arranged on the guide rail Ia 25 and the guide rail Ib 33 through a sliding block Ib 24 and a sliding block Ib 34, and the guide rail Ia 25 and the guide rail Ib 33 are arranged on the bottom plate 29; two ends of the tension sensor 13 are respectively connected with the nut seat 3 and the clamp body I2, and the clamp body I2 is respectively arranged on a guide rail Ia 25 and a guide rail Ib 33 through a slide block Ia 23 and a slide block dI 35; the displacement sensor I4 adopts a separated LVDT, the main body part of the sensor is arranged on a bottom plate I29, the iron core of the sensor is arranged on a top plate I22 through threads, the top plate I22 is arranged on a fixture body I2, and the bottom plate 29 is fixed on the base 14 through a supporting block I26.
Referring to fig. 4, the fatigue loading and detecting unit of the present invention includes a flexible hinge 18, a piezoelectric ceramic 19, a clamp body ii 41, a displacement sensor ii 20, etc.; the piezoelectric ceramic 19 is arranged in the flexible hinge 18, the fixed end of the flexible hinge 18 is fixed on the base plate II 17 through a screw, the movable end of the flexible hinge 18 is connected with the clamp body II 41, the clamp body II 41 is respectively arranged on the guide rail II a38 and the guide rail II b44 through a slide block II a37 and a slide block II b45, and the guide rail II a38 and the guide rail II b44 are arranged on the base plate II 17; the displacement sensor II 20 is used for measuring the displacement of the clamp body II 41 during fatigue testing, the fixed end of the displacement sensor II 20 is arranged on the bottom plate II 17, the movable end of the displacement sensor II 20 is connected with the top plate II 39, and the top plate II 39 is arranged on the clamp body II 41; the bottom plate II 17 is fixed on the base 14 through a supporting block II 15.
The in-situ observation unit comprises an optical microscope 21 and a bracket 1; the working distance of the optical microscope 21 is large enough to cover the surface to be observed of the test piece from the window 46 above the high temperature furnace, and the position of the optical microscope 21 can be adjusted by the bracket 1.
The high-temperature loading and detecting unit consists of a high-temperature furnace 16 and a control system thereof; the heating element of the high-temperature furnace 16 is a silicon-molybdenum rod which is powered to generate heat, the high-temperature silicon-molybdenum rod enables the temperature in the furnace cavity to rise rapidly through radiation, the temperature of the inner cavity of the high-temperature furnace can reach 1700 ℃, the high-temperature furnace comprises a heat insulation layer and a water cooling layer from inside to outside, the temperature of the outer surface of the high-temperature furnace can be maintained at room temperature through water cooling, and a thermocouple is arranged in the inner cavity of the high-temperature furnace and used for monitoring the actual temperature of the inner cavity of the high-temperature furnace; the high temperature furnace 16 is provided with a corresponding control cabinet for controlling the temperature of the inner cavity of the high temperature furnace.
The clamp body I2 and the clamp body II 41 are respectively connected with the pressure plate I36 and the pressure plate II 40 through screws, and the test piece is clamped through screwing the screws; grooves are processed on the clamp body I2 and the clamp body II 41 and used for positioning a test piece; knurling is processed on the clamp body I2, the pressing plate I36, the clamp body II 41 and the pressing plate II 40, so that the clamping reliability is guaranteed.
The high temperature furnace 16 is positioned and adjusted through surrounding stop blocks, such as a stop block I47, a stop block II 48 and a stop block III 43.
Referring to fig. 1 to 5, before the test system is installed, the tension sensor 13, the displacement sensor i 4, and the displacement sensor ii 20 used in the test system need to be calibrated and corrected, and then the test system needs to be installed and debugged. Before a test piece is installed, the position of the clamp body I2 needs to be adjusted so that the test piece can pass through a high-temperature furnace; before heating, the circular holes on both sides of the high temperature furnace 16 need to be plugged with heat-insulating plugs, but the plugs are ensured not to contact with the test piece so as to avoid generating additional friction force.
According to the experimental purpose, a proper measuring method, namely a uniaxial tension test or a tension-fatigue composite load test, is selected, wherein the related fatigue test mainly refers to a low-cycle fatigue test and is carried out on the basis that the test piece is stretched, namely the test piece is subjected to a middle-low frequency tension test under the condition of certain deformation or certain load. The main analysis of the test studies carried out with the inventive test system is therefore the modulus of elasticity of the materialEYield strength ofStrength limit ofElongation after fractureAReduction of areaZAnd mechanical performance parameters are equal. Wherein,
modulus of elasticity，
Yield strength，
Strength limit，
Elongation after fracture，
Reduction of area；
Wherein,: the stress of the material is such that,: the strain of the material is such that,: the material load at the point of lower yield point,: the maximum load of the material is such that,: the original cross-sectional area of the material,: the cross-sectional area of the material after fracture,: the original gauge length of the material is measured,: and (5) marking the distance after the material is broken.
The mechanical properties of the material are mainly reflected in the deformation and destruction properties of the material under the action of load. The elastic modulus, the breaking limit, the fatigue strength and other parameters of the material are the most main test objects in the mechanical property test of the material, and the elastic modulus, the yield strength, the strength limit, the elongation after breaking and the reduction of area of the material can be measured through a tensile test, so that the mechanical property of the material when bearing tensile load is measured. And (3) researching the yielding and breaking processes of the material under the action of the biaxial tension load through a load-displacement curve. The alternating stress generated by the cyclic loading force can generate permanent damage to the local part of the material and induce the initiation, the propagation and the instability of the crack. The influence of fatigue load on the mechanical properties of the material can be measured by a tensile-fatigue test. However, different materials exhibit different responses to temperature, such as differences in the sensitivity of stress to temperature, differences in the temperature softening effect of strain rate, and the like. The mechanical properties of the materials at different temperatures are even greatly different, namely the elastic modulus, the yield strength, the strength limit, the elongation after fracture, the reduction of area and the like of the same material measured at different temperatures are different.
Such as at a temperature ofThe mechanical property parameters of some materials vary with temperature as follows:
，
，
；
wherein：The modulus of elasticity at temperature is such that,: the modulus of elasticity at normal temperature,：the yield strength at a temperature of at least one of the components,: the yield strength at normal temperature is high,、、、and: a coefficient related to the material;：the total strain at the temperature of the steel is,: the instantaneous strain caused by the stress is generated,: the material of the metal layer is subject to creep deformation,: strain due to thermal expansion.
When the temperature reaches a higher temperature, for example, the temperature reaches the recrystallization temperature of the material, the mechanical property parameters of the material may show other trends along with the temperature change.
The mechanical property parameters of the material under the action of tensile and fatigue loads under different temperature fields can be measured through a high-temperature tensile-fatigue test.
In the whole testing process, in order to monitor the conditions of crack initiation, expansion and instability of a tested piece in real time, the test piece needs to be polished and corroded before testing, an optical microscope imaging system is used for dynamic monitoring, images can be recorded simultaneously, and an engineering stress-strain curve and other mechanical parameters representing the mechanical property of the material can be obtained in real time by combining debugging software.
Referring to fig. 7 and 8, the position of the microscope before testing corresponds to the observation area, and with the application of the tensile load, the observation area gradually has the phenomena of crack initiation, crack propagation and the like until the test piece is broken, and meanwhile, the lens is adjusted along with the movement of the observation area of the test piece, so that the whole-process dynamic monitoring of the microscopic deformation damage of the material is ensured.
The above description is only a preferred example of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made to the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A high-temperature in-situ tensile-fatigue test system is characterized in that: the device comprises a tensile loading and detecting unit, a fatigue loading and detecting unit, an in-situ observation unit and a high-temperature loading and detecting unit which are integrally and horizontally arranged, wherein the tensile loading and detecting unit and the fatigue loading and detecting unit are respectively arranged on two sides of a high-temperature furnace, the directions of the tensile loading and the fatigue loading are on the same axis, the tensile loading and detecting unit and the fatigue loading and detecting unit are arranged on a base (14), and the in-situ observation unit is arranged above the high-temperature loading and detecting unit and is arranged on the base (14) through a support (1).
2. The high temperature in-situ tensile-fatigue test system of claim 1, wherein: the tensile loading and detecting unit is powered by a servo motor (12), and applies tensile load to the test piece through a worm wheel II (9), a worm II (10), a worm wheel I (5), a worm I (7), a lead screw (28) and a nut (27); the servo motor (12) is arranged on the base (14) through the motor base (11), and the worm I (7) is arranged on an output shaft of the motor; the worm wheel II (9) and the worm I (7) are arranged on a shaft (31), and the shaft is arranged on the base (14) through a bearing I (30), a bearing seat I (6), a bearing II (32) and a bearing seat II (8); the worm wheel I (5) is arranged on a lead screw (28), and the lead screw (28) is arranged on a bottom plate (29) through a lead screw seat (42); the nut (27) is installed on the nut seat (3), the nut seat (3) is respectively installed on a guide rail Ia (25) and a guide rail Ib (33) through a sliding block Ib (24) and a sliding block ic (34), and the guide rail Ia (25) and the guide rail Ib (33) are installed on the bottom plate (29); two ends of a tension sensor (13) are respectively connected with a nut seat (3) and a clamp body I (2), and the clamp body I (2) is respectively installed on a guide rail I a (25) and a guide rail I b (33) through a sliding block I a (23) and a sliding block I d (35); the displacement sensor I (4) adopts a separated LVDT, the main body part of the sensor is installed on a bottom plate I (29), an iron core of the sensor is installed on a top plate I (22) through threads, the top plate I (22) is installed on a clamp body I (2), and the bottom plate (29) is fixed on a base (14) through a supporting block I (26).
3. The high temperature in-situ tensile-fatigue test system of claim 1, wherein: the fatigue loading and detecting unit comprises a flexible hinge (18), piezoelectric ceramics (19), a fixture body II (41) and a displacement sensor II (20), wherein the piezoelectric ceramics (19) are installed in the flexible hinge (18), the fixed end of the flexible hinge (18) is fixed on a base plate II (17) through a screw, the movable end of the flexible hinge (18) is connected with the fixture body II (41), the fixture body II (41) is respectively installed on a guide rail II a (38) and a guide rail II b (44) through a sliding block II (37) and a sliding block II (45), and the guide rail II a (38) and the guide rail II b (44) are installed on the base plate II (17); the displacement sensor II (20) is arranged on the bottom plate II (17) and is used for measuring the displacement of the fixture body II (41) during fatigue testing; and the bottom plate II (17) is fixed on the base (14) through a supporting block II (15).
4. The high temperature in-situ tensile-fatigue test system of claim 1, wherein: the in-situ observation unit comprises an optical microscope (21) and a support (1), wherein the working distance of the optical microscope (21) is large enough, the surface to be observed of the test piece is covered by a window (46) above the high-temperature furnace, and the position of the optical microscope (21) is adjusted by the support (1).
5. The high temperature in-situ tensile-fatigue test system of claim 1, wherein: the high-temperature loading and detecting unit comprises a high-temperature furnace (16), wherein a heating element of the high-temperature furnace (16) is a silicon-molybdenum rod, the silicon-molybdenum rod is powered to generate heat, the high-temperature silicon-molybdenum rod enables the temperature in the furnace cavity to rise rapidly through radiation, the temperature of the inner cavity of the high-temperature furnace can reach 1700 ℃, the temperature of the outer surface of the high-temperature furnace can be maintained at room temperature through water cooling, and a thermocouple is arranged in the inner cavity of the high-temperature furnace and used for monitoring the actual temperature of the inner cavity of the high-temperature furnace; the high-temperature furnace (16) is provided with a control cabinet for controlling the temperature of the inner cavity of the high-temperature furnace.
6. The high temperature in-situ tensile-fatigue test system of claim 2, wherein: the clamp body I (2) is connected with the pressure plate I (36) through a screw, and the test piece is clamped through screwing the screw; a groove is processed in the clamp body I (2) and used for positioning a test piece; knurling is processed on the clamp body I (2) and the pressing plate I (36) so as to guarantee the reliability of clamping.
7. The high temperature in-situ tensile-fatigue test system of claim 3, wherein: the clamp body II (41) is connected with the pressure plate II (40) through a screw, and the test piece is clamped through screwing the screw; a groove is processed on the clamp body II (41) and used for positioning a test piece; knurling is processed on the clamp body II (41) and the pressing plate II (40) so as to guarantee the reliability of clamping.
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| CN104913981A (en) * | 2015-05-12 | 2015-09-16 | 吉林大学 | High-temperature in situ tension-fatigue test system and test method thereof |
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| CN104913981B (en) * | 2015-05-12 | 2017-07-14 | 吉林大学 | High-temp in-situ tensile fatigue test system and its method of testing |
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