CN108007791B - Multi-station creep test device and method - Google Patents
Multi-station creep test device and method Download PDFInfo
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- CN108007791B CN108007791B CN201710669484.2A CN201710669484A CN108007791B CN 108007791 B CN108007791 B CN 108007791B CN 201710669484 A CN201710669484 A CN 201710669484A CN 108007791 B CN108007791 B CN 108007791B
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- 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
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- 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
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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- 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
- G01N2203/0071—Creep
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Abstract
The invention belongs to the technical field of material stress, and provides a multi-station creep test device and a method, which comprises a closed heating furnace, a driving assembly movably connected in the heating furnace and applying force to a sample, and a testing assembly connected on the sample, wherein the heating furnace comprises a disc-shaped bottom plate piece and a furnace body, the driving assembly comprises a first driving assembly capable of moving relative to the furnace body and a second driving assembly capable of moving relative to the bottom plate piece, a plurality of samples are pre-fixed on the end surface of the second driving assembly, the distance between each sample and the circle center of the bottom plate piece is the same, and one of the samples is also connected with a thermocouple for comparing temperature; then, the device and the method can solve the problems that the conventional creep testing machine cannot carry out batch simultaneous measurement and the load and temperature control cannot be accurately and synchronously controlled.
Description
Technical Field
The invention belongs to the technical field of material stress, and particularly relates to a multi-station creep test device and method.
Background
In the aerospace field, a high-temperature alloy part can generate a creep phenomenon in a high-temperature stress environment, namely, the strain is gradually increased along with the time. Creep property is an important index of high-temperature alloy materials, and meanwhile, a creep test is one of indispensable tests for developing novel high-temperature alloys. At present, most of creep testing machines carry out uniaxial tensile creep tests, and long creep test time and high cost are the biggest limiting factors for carrying out large-batch creep tests. At present, a plurality of parallel testing devices can carry out multi-sample synchronous testing, but the accurate and synchronous control cannot be achieved in the aspects of equal load control and constant temperature control, and the testing temperature range is narrow.
Disclosure of Invention
The invention aims to provide a multi-station creep testing device, and aims to solve the problems that the conventional creep testing machine cannot perform batch simultaneous measurement and load and temperature control cannot be accurately and synchronously controlled.
The invention is solved as follows: the utility model provides a multistation creep test device, includes that closed heating furnace, removal are connected in the heating furnace and to the drive assembly of sample application of force and connect test assembly on the sample, the heating furnace includes discoid bottom plate spare and furnace body, drive assembly including can for first drive assembly that the furnace body removed and can for the second drive assembly that the bottom plate spare removed, it is a plurality of the sample is pre-fixed on the terminal surface of second drive assembly, each the sample is kept away from the distance of bottom plate spare centre of a circle is the same, and one of them still is connected with the thermocouple that is used for comparing the temperature on the sample.
Furthermore, the furnace body is in a barrel shape, silicon-molybdenum rods for balanced heating are connected in the furnace body, and the silicon-molybdenum rods are uniformly arranged in the furnace body.
Furthermore, the first driving assembly comprises a driving motor, a driving shaft connected to the driving motor and a disc pressing piece connected to the tail end of the driving shaft and capable of moving up and down along with the driving shaft in a telescopic mode, and the disc pressing piece is movably connected in the furnace body.
Further, the center of the disc pressing piece and the center of the bottom plate piece are both on the extension line of the axis of the driving shaft, and the distance between the test sample and the center of the bottom plate piece is smaller than the radius of the disc pressing piece.
Furthermore, the second drive assembly comprises a drive pump and a plurality of drive rods connected to the drive pump, a plurality of through holes for the upper ends of the drive rods to pass through are formed in the bottom plate, and one sample is connected to the top ends of the drive rods in a limiting manner.
Furthermore, the driving pump comprises a hydraulic cylinder body and hydraulic oil contained in the hydraulic cylinder body, and a plurality of driving grooves for connecting the driving rod are uniformly formed in the hydraulic cylinder body.
Further, the testing component comprises an extensometer, a load sensor and a temperature sensor, wherein the extensometer is connected to the test sample, the temperature sensor is connected to the inside of the furnace body, and the temperature display component and the regulation and control component are arranged on the testing component.
Compared with the prior art, the multi-station creep test device provided by the invention has the technical effects that: the heating furnace is arranged in a closed mode, so that the temperature in the heating furnace can be more balanced, meanwhile, the samples are uniformly arranged on the second driving assembly, the samples are compressed when the first driving assembly and the second driving assembly move relatively, the load of each sample is uniform and the same, and therefore creep data of the samples at the same temperature can be tested; simultaneously, one of the multiple samples is selected as a reference sample, and the actual temperature tested by the testing component is adjusted to be the same as the actual temperature measured by the thermocouple, so that the temperature can be controlled more accurately.
The invention also provides a creep test method which is operated by the multi-station creep test device and comprises the following steps;
s1, placing a plurality of samples on the top end of the second driving assembly, and selecting one of the samples as a reference sample;
s2, driving the first driving unit so that the lower end surface of the first driving unit abuts on the sample, and applying a preload;
s3, driving the furnace body to move to be connected with the bottom plate piece;
s4, controlling the furnace body to heat, carrying out constant-temperature heating treatment after the temperature is stable, and then starting the second driving assembly to continuously apply the load;
s5, recording temperature, load and creep.
Further, in the step S2, the applied amount of the preload is 500N.
Further, in step S4, after the heating process is performed until the temperature is constant, the temperature is maintained for 30min, and then the second driving assembly continues to apply the load.
Compared with the prior art, the creep test method provided by the invention has the technical effects that: through the arrangement of the reference sample and the application of the preload of the first driving assembly, the initial loads of all samples in the heating furnace can be ensured to be the same, then the heating and constant-temperature heating treatment of the furnace body is carried out, so that the temperatures of all the samples are the same as those of the reference sample, then the second driving assembly continues to apply the load, so that each sample obtains the same creep applying force, and then the test results of a plurality of samples are recorded at the same time; the whole process is that the sample creeps under the same temperature and the same external force action, thereby ensuring the high efficiency and accuracy of the test.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a perspective view of the overall structure of a multi-station creep test device according to an embodiment of the present invention.
FIG. 2 is a perspective view of a multi-station creep test device provided in an embodiment of the present invention, wherein a furnace body of a heating furnace is partially cut away.
FIG. 3 is a perspective view showing the structure of a multi-station creep test apparatus according to an embodiment of the present invention, in which a furnace body and a floor member of a heating furnace are separated.
FIG. 4 is a top view of a base plate in a multi-station creep test apparatus according to an embodiment of the present invention.
Fig. 5 is a half-sectional schematic view of a second driving assembly in the multi-station creep test device provided by the embodiment of the invention.
FIG. 6 is a flow chart of a creep test method provided by an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1 to 5, in an embodiment of the present invention, a multi-station creep test apparatus is provided, which includes a closed-type heating furnace 10, a driving assembly and a testing assembly. This heating furnace 10 can open when placing the sample 40 that awaits measuring to can be sealed after this sample 40 is placed and is accomplished, can reduce the loss of heat in the heating furnace 10 like this, and then guarantee the stability of temperature. The driving assembly is movably connected in the heating furnace 10, so that a force can be applied to the sample 40 in the heating furnace 10 to enable the sample 40 to creep. The test assembly is used in cooperation with the drive assembly to measure the temperature, amount of deformation and magnitude of applied load during creep of the test specimen 40. The heating furnace 10 comprises a disk-shaped base plate member 12 and a furnace body 12, wherein the furnace body 12 can move relative to the base plate member 12, thereby facilitating the installation of the test sample 40. The driving assembly includes a first driving assembly 20 movable relative to the furnace body 12 and a second driving assembly 30 movable relative to the floor member 12, and a third driving assembly 50 driving the furnace body 12 to move relative to the floor member 12. The heating furnace 10 can simultaneously test a plurality of samples 40, the plurality of samples 40 are pre-fixed on the end face of the second driving component 30, during testing, the heating furnace 10 adjusts the environmental temperature of the samples 40 to a stable state, then the first driving component 20 and the second driving component 30 move relatively to press the samples 40, and then the testing component records test data; in the process, the distance between each sample 40 and the center of the bottom plate member 12 is the same, so that the stress of each sample 40 is ensured to be more uniform, and a thermocouple 41 for comparing the temperature is further connected to one of the samples 40, so that the actual temperature of the sample 40 is ensured to be closer to the temperature in the heating furnace 10, and the temperature control of the samples 40 is more accurate.
According to the multi-station creep test device, the heating furnace 10 is sealed, so that the temperature in the heating furnace 10 is more balanced, meanwhile, the plurality of samples 40 are uniformly arranged on the second driving assembly 30, the plurality of samples 40 are compressed when the first driving assembly 20 and the second driving assembly 30 move relatively, the load of each sample 40 is uniform and the same, and creep data of the plurality of samples 40 at the same temperature can be tested; meanwhile, one of the plurality of samples 40 is selected as a reference sample 40, and the actual temperature tested by the testing component is adjusted to be the same as the actual temperature of the thermocouple 41, so that the temperature can be controlled more accurately.
Specifically, as shown in fig. 1 to 3, in the embodiment of the present invention, the furnace body 12 is in a cylindrical shape, so that the furnace body 12 can be better matched with the bottom plate 12 when moving, and a silicon-molybdenum rod for uniform heating is connected in the furnace body 12, and a plurality of silicon-molybdenum rods are uniformly arranged in the furnace body 12. The silicon-molybdenum rod can realize temperature change from room temperature to 1100 ℃, and further can realize creep selection of the same or different alloy materials at different temperatures.
Specifically, as shown in fig. 2, in the embodiment of the present invention, the first driving assembly 20 includes a driving motor 21, a driving shaft 22 connected to the driving motor 21, and a disc pressing member 23 connected to the end of the driving shaft 22 and moving up and down telescopically with the driving shaft 22, wherein the disc pressing member 23 is movably connected in the furnace body 12.
In this embodiment, the multi-station creep test device further comprises a support assembly 80, the support assembly 80 comprises a support base 81 to which the second driving assembly 30 can be connected, a plurality of support shafts 82 extending upwards along the support base 81, and a support beam 83 connected to the tops of the plurality of support shafts 82, the driving motor 21 is connected to the support beam 83, the driving shaft 22 can be connected to the support beam 83 in a telescopic manner, the disc pressing member 23 can move in the furnace body 12 and relative to the furnace body 12 along with the telescopic movement of the driving shaft 22, and can apply a preload to the sample 40 in the furnace body 12 during the downward movement.
Specifically, as shown in fig. 4, in the embodiment of the present invention, the center of the disc platen member 23 and the center of the base plate member 12 are both on the extension of the axis of the drive shaft 22, and the distance of the test piece 40 from the center of the base plate member 12 is smaller than the radius of the disc platen member 23.
In the embodiment, the center of the disc pressing member 23 is on the extension line of the axis of the driving shaft 22, so that when the disc pressing member 23 moves downwards to apply preload force to a plurality of test samples 40, the plurality of test samples 40 are subjected to the same force, and the center of the bottom plate member 12 is on the extension line of the axis of the driving shaft 22, that is, the disc pressing member 23 and the bottom plate member 12 are arranged oppositely; meanwhile, the distance from each sample 40 to the center of the bottom plate member 12 is the same and is smaller than the radius of the disc-shaped pressing plate member 23, so that each sample 40 can be ensured to be in complete contact with the bottom surface of the disc-shaped pressing plate member 23.
Specifically, as shown in fig. 2 and 5, in the embodiment of the present invention, the second driving assembly 30 includes a driving pump 31 and a plurality of driving rods 32 connected to the driving pump 31, the plurality of driving rods 32 move upward in a balanced manner along with the driving of the driving pump 31, the bottom plate 12 is provided with a plurality of through holes for passing through the upper ends of the driving rods 32, and the top end of each driving rod 32 is connected to one of the test samples 40 in a limiting manner.
In the embodiment of the present invention, the driving pump 31 includes a hydraulic cylinder 311 and hydraulic oil 313 contained in the hydraulic cylinder 311, and a plurality of driving grooves 312 for connecting the driving rod 32 are uniformly formed on the hydraulic cylinder 311. When the hydraulic oil 313 in the hydraulic cylinder 311 expands, the driving force applied to each driving groove 312 is the same, so that the upward load applied to the test sample 40 connected to the top end of each driving rod 32 is the same; and thus the validity of data when a plurality of specimens 40 are measured simultaneously can be ensured.
Specifically, as shown in fig. 2, in the embodiment of the present invention, the third driving assembly 50 includes two secondary motors 51 connected to the supporting beams 83 and transmission shafts 52 connected to the lower ends of the secondary motors 51, the ends of the two transmission shafts 52 are connected to the top surface of the furnace body 12, and the secondary motors 51 are driven to move the furnace body 12 relative to the bottom plate 12, so as to realize the closing and opening of the heating furnace 10.
Specifically, as shown in fig. 1 to 3, in the embodiment of the present invention, the testing assembly includes an extensometer 60 connected to the test specimen 40, a load sensor and a temperature sensor connected inside the furnace body 12, as well as a temperature display assembly 70 and a regulation and control assembly. The extensometer 60 is used for recording the stress change of the sample 40, the load sensor is used for sensing the load change of the sample 40, the temperature sensor is used for sensing the problem change in the furnace body 12, and the temperature display assembly 70 is used for displaying the temperature of the reference sample 40 and the problem change in the furnace body 12. The regulating component is used for regulating the size change of load and temperature.
The invention also provides a creep test method, as shown in fig. 2 and fig. 6, which is implemented by the multi-station creep test device, and specifically comprises the following steps;
s1, placing a plurality of samples 40 on the top end of the second driving assembly 30, and selecting one of the samples 40 as a reference sample;
in this step, the furnace body 12 is first moved with respect to the base plate member 12, thereby facilitating the uniform placement of a plurality of specimens 40 on the top end of the second driving assembly 30, while randomly selecting one specimen 40, and a thermocouple 41 is attached to the specimen 40 to serve as a reference specimen.
S2, driving the first driving unit 20 so that the lower end surface of the first driving unit 20 abuts on the sample 40, and applying a preload;
in this step, the disc pressing member 23 at the lower end of the first driving assembly 20 moves downward in the furnace body 12 along with the telescopic movement of the driving shaft 22 so that the lower end surface of the disc pressing member 23 abuts on the plurality of samples 40, and then the driving motor 21 continues to drive the disc pressing member 23 to move downward to give a preload, preferably 500N, to the plurality of samples 40, thereby ensuring that the initial pressures of the plurality of samples 40 are the same.
S3, driving the furnace body 12 to move to be connected with the bottom plate 12; this facilitates the enclosure of the furnace 10.
S4, controlling the furnace body 12 to heat, carrying out constant temperature heating treatment after the temperature is stable, and then starting the second driving assembly 30 to continuously apply the load;
in this step, the sample 40 is heated, the belt is heated to a certain temperature and then is kept at the temperature for heating for 30min, then the driving rod 32 is pushed to move upwards by expanding the hydraulic oil 313 in the driving cylinder in the second driving assembly 30, so that the sample 40 is compressed and creeps, meanwhile, the driving force of the expanded hydraulic oil 313 on each driving rod 32 is the same, and further, the load on each sample 40 connected to the top of the driving rod 32 is the same.
S5, recording temperature, load and creep. The desired test data is then obtained.
According to the creep test method designed above, through the setting of the reference sample 40 and the application of the preload of the first driving assembly 20, the initial loads of all the samples 40 in the heating furnace 10 can be ensured to be the same, then the heating and constant-temperature heating treatment of the furnace body 12 is carried out, so that the temperatures of all the samples 40 are the same as the temperature of the reference sample, then the second driving assembly 30 continues to apply the load, so that each sample 40 obtains the same creep application force, and then the test results of a plurality of samples 40 are recorded at the same time; the test sample 40 creeps under the same temperature and the same external force action in the whole process, so that the efficient and accurate test is ensured.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. The utility model provides a multistation creep test device which characterized in that: the device comprises a closed heating furnace, a driving assembly and a testing assembly, wherein the driving assembly is movably connected in the heating furnace and applies force to a sample, the testing assembly is connected to the sample, the heating furnace comprises a disc-shaped bottom plate piece and a furnace body, the driving assembly comprises a first driving assembly capable of moving relative to the furnace body and a second driving assembly capable of moving relative to the bottom plate piece, a plurality of samples are pre-fixed on the end face of the second driving assembly, the distance between each sample and the center of the bottom plate piece is the same, and one sample is also connected with a thermocouple for comparing temperature; multistation creep test device still includes supporting component, supporting component supporting beam, driving motor connects on the supporting beam, a driving component includes driving motor, connects drive motor last drive shaft and connection are in the drive shaft is terminal and follow the flexible disc clamp plate spare that removes about the drive shaft, the scalable removal of drive shaft is connected supporting beam, disc clamp plate spare removes to be connected in the furnace body, the center of disc clamp plate spare with the center of bottom plate spare is all in on the axis extension line of drive shaft, just the sample is apart from the distance at bottom plate spare center is less than the radius of disc clamp plate spare.
2. The multi-station creep test apparatus of claim 1, wherein: the furnace body is cask form, just be connected with the silicon molybdenum stick that is used for the equilibrium heating in the furnace body, it is a plurality of silicon molybdenum stick is evenly arranged in the furnace body.
3. The multi-station creep test apparatus of claim 1, wherein: the second drive assembly comprises a drive pump and a plurality of drive rods connected to the drive pump, a plurality of through holes are formed in the bottom plate piece, the upper ends of the drive rods penetrate through the through holes, and each drive rod is connected with one sample in a limiting mode at the top end of the drive rod.
4. A multi-station creep testing apparatus according to claim 3, wherein: the driving pump comprises a hydraulic cylinder body and hydraulic oil contained in the hydraulic cylinder body, and a plurality of driving grooves for connecting the driving rod are uniformly formed in the hydraulic cylinder body.
5. The multi-station creep test apparatus of claim 1, wherein: the test assembly comprises an extensometer connected to the sample, a load sensor, a temperature sensor connected to the interior of the furnace body, a temperature display assembly and a regulation and control assembly.
6. A creep test method operated by a multi-station creep test apparatus according to any of claims 1 to 5, characterized in that: comprises the following steps;
s1, placing a plurality of samples on the top end of the second driving assembly, and selecting one of the samples as a reference sample;
s2, driving the first driving unit so that the lower end surface of the first driving unit abuts on the sample, and applying a preload;
s3, driving the furnace body to move to be connected with the bottom plate piece;
s4, controlling the furnace body to heat, carrying out constant-temperature heating treatment after the temperature is stable, and then starting the second driving assembly to continuously apply the load;
s5, recording temperature, load and creep.
7. The creep test method of claim 6, wherein: in step S2, the preload is applied in an amount of 500N.
8. The creep test method of claim 6, wherein: in step S4, after the heating process is performed until the temperature is constant, the temperature is maintained for 30min, and then the second driving assembly continues to apply the load.
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| CN109030234B (en) * | 2018-09-19 | 2024-03-12 | 中国工程物理研究院化工材料研究所 | System and method for testing long-time creep property of explosive |
| CN110031297B (en) * | 2019-04-08 | 2024-05-17 | 中国科学院金属研究所 | High-flux rotary tensile test device |
| CN113984507B (en) * | 2021-11-16 | 2023-08-04 | 中国石油大学(华东) | Multi-station high polymer material accelerated aging test method |
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| US4852397A (en) * | 1988-01-15 | 1989-08-01 | Haggag Fahmy M | Field indentation microprobe for structural integrity evaluation |
| JPH09126973A (en) * | 1995-10-31 | 1997-05-16 | Japan Casting & Forging Corp | High-temperature creep testing device |
| KR100378423B1 (en) * | 2000-05-08 | 2003-03-29 | 한국전력공사 | Creep testing method and equipment with multi-lever arm and load cell |
| US7363821B2 (en) * | 2006-08-28 | 2008-04-29 | Cordis Corporation | Systems and methods for fatigue testing stents |
| JP5554886B2 (en) * | 2007-01-09 | 2014-07-23 | 中国電力株式会社 | Creep test method and test body manufacturing method |
| EP2023119A1 (en) * | 2007-08-10 | 2009-02-11 | Universität Bayreuth | Biological cell monolayer shearing apparatus for diagnostic purposes |
| CN102519803B (en) * | 2011-12-30 | 2014-06-04 | 华东理工大学 | Multi-head miniature test specimen creep experiment device and test method |
| CN203502309U (en) * | 2013-08-05 | 2014-03-26 | 大连理工大学 | TFLD (Temperature Forming Limit Diagram) testing device for high-temperature warm and hot forming limit of metal |
| CN105784491A (en) * | 2016-03-10 | 2016-07-20 | 清华大学 | Cement-based material compression creep testing device |
| CN106153472A (en) * | 2016-06-17 | 2016-11-23 | 华北电力大学 | A kind of realize multi-axial creep pilot system and the method that intrinsic pressure and stretching combinations loads |
| CN110044782B (en) * | 2019-05-20 | 2019-10-11 | 西南石油大学 | Across the scale wide spectrum partial size plugging formula Analytical Methods of Grain Grade of one kind |
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