CN106644749B - Tensile mechanical property testing device suitable for high-temperature vacuum - Google Patents
Tensile mechanical property testing device suitable for high-temperature vacuum Download PDFInfo
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- CN106644749B CN106644749B CN201610976521.XA CN201610976521A CN106644749B CN 106644749 B CN106644749 B CN 106644749B CN 201610976521 A CN201610976521 A CN 201610976521A CN 106644749 B CN106644749 B CN 106644749B
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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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Abstract
The invention discloses a tensile mechanical property testing device suitable for high-temperature vacuum, which comprises an environment control device and a deformation measurement extensometer, wherein the deformation measurement extensometer comprises a first extensometer and a second extensometer, the deformation measurement extensometer is arranged on the side surface of the environment control device, the first extensometer is used for abutting against the top end of a sample, and the second extensometer is used for abutting against the bottom end of the sample; and the stretching amount of the sample corresponds to the difference between the distances between the first stretching rod and the second stretching rod before and after the test. By the device, the extension of the extension rod can not be influenced when the extension rod is changed in a high-temperature environment, and the error of a test result is reduced.
Description
Technical Field
The invention relates to the technical field of material performance testing, in particular to a tensile mechanical property testing device suitable for high-temperature vacuum.
Background
The mechanical properties of the material refer to the mechanical characteristics of the material when the material is subjected to various external loads (tensile, compressive, bending, torsional, impact, alternating stress and the like) under different environments (temperature, medium and humidity). As shown in fig. 1, in a conventional tensile mechanical property test, an upper chuck 1 is connected to an upper link 3 through an upper pin 2, a lower chuck 4 is connected to a lower link 6 through a lower pin 5, a strain gauge 8 is disposed on the lower link side, and the tensile mechanical property of a sample is measured by the elongation of a tensile rod 9 of the strain gauge in a tensile test process of the sample 7. However, some tests are often performed in a high-temperature environment, and the extension rod changes correspondingly with the change of the temperature field in the high-temperature environment, so that the error of the test result is large.
In summary, how to solve the problem of large error of the test result becomes a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to provide a tensile mechanical property testing device suitable for high-temperature vacuum, so that the error of a testing result is reduced.
In order to achieve the above object, the present invention provides a tensile mechanical property testing device suitable for high temperature vacuum, which includes an environment control device and a deformation measurement extensometer, wherein the deformation measurement extensometer includes a first extensometer and a second extensometer, the deformation measurement extensometer is arranged on the side surface of the environment control device, the first extensometer is used for abutting against the top end of a sample, and the second extensometer is used for abutting against the bottom end of the sample; and the stretching amount of the sample corresponds to the difference between the distances between the first stretching rod and the second stretching rod before and after the test.
Preferably, the stretching assembly of the sample comprises an upper chuck assembly fixedly connected with the upper connecting rod in the axial direction and a lower chuck assembly fixedly connected with the lower connecting rod in the axial direction;
the upper chuck component comprises an upper chuck rod and an upper stretching chuck which is in sliding fit with the upper chuck rod along the direction vertical to the stretching direction;
the lower chuck component comprises a lower chuck rod and a lower stretching chuck which is in sliding fit with the lower chuck rod along the direction vertical to the stretching direction;
the upper stretching chuck and the lower stretching chuck are used for fixing a sample.
Preferably, a first groove is formed in the upper chuck rod, and one end of the upper stretching chuck can be embedded into the first groove and can slide along the first groove; and a second groove is formed in the lower chuck rod, and one end of the lower stretching chuck can be embedded into the second groove and can slide along the second groove.
Preferably, the first groove and the second groove are both dovetail grooves.
Preferably, the upper stretching chuck and the lower stretching chuck are provided with conical convex cards which can be embedded into the dovetail grooves.
Preferably, the upper jaw assembly is rotatable about an axis of the upper link and/or the lower jaw assembly is rotatable about an axis of the lower link.
Preferably, the direction of the sliding fit of the upper tensile collet and the upper collet rod and the direction of the sliding fit of the lower tensile collet and the lower collet rod intersect perpendicularly.
Preferably, the environment control device of the device comprises a box body and a heating and heat insulation device arranged inside the box body, and the upper chuck assembly and the lower chuck assembly are arranged inside the heating and heat insulation device.
Preferably, a plurality of doors are provided on the case.
Preferably, a movement adjusting device is arranged below the environment control device.
Compared with the introduction content of the background technology, the tensile mechanical property testing device suitable for high-temperature vacuum is characterized in that the deformation measurement extensometer is arranged on the side surface of the environment control device, the first extension rod is used for abutting against the top end of a sample, and the second extension rod is used for abutting against the bottom end of the sample; and the stretching amount of the sample corresponds to the distance difference between the first stretching rod and the second stretching rod before and after the test. Therefore, the extension of the extension rod is changed under the high-temperature environment, the test result is not affected, and the error of the test result is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a conventional tensile mechanical property testing device suitable for high-temperature vacuum;
FIG. 2 is a schematic structural diagram of a tensile mechanical property testing apparatus suitable for high-temperature vacuum according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a stretching assembly according to an embodiment of the present invention.
In the above-mentioned figures 1-3,
the device comprises an upper chuck 1, an upper pin 2, an upper connecting rod 3, a lower chuck 4, a lower pin 5, a lower connecting rod 6, a sample 7, a deformation measurement extensometer 8, an extension rod 9, an upper chuck rod 10, an upper stretching chuck 11, a lower chuck rod 12, a lower stretching chuck 13, a heating and heat insulation device 15, a movement adjusting device 16, a first extension rod 17 and a second extension rod 18.
Detailed Description
The core of the invention is to provide a tensile mechanical property testing device suitable for high-temperature vacuum so as to reduce the error of a testing result.
In order to make those skilled in the art better understand the technical solutions provided by the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 2 and fig. 3, the tensile mechanical property testing apparatus suitable for high-temperature vacuum provided by the embodiment of the present invention includes an environment control apparatus and a deformation measurement extensometer 8, the deformation measurement extensometer 8 includes a first extensometer 17 and a second extensometer 18, the deformation measurement extensometer 8 is disposed on a side surface of the environment control apparatus, and the first extensometer 17 is used for abutting against a top end of a sample 7, and the second extensometer 18 is used for abutting against a bottom end of the sample 7; and the stretching amount of the sample 7 corresponds to the difference between the distances between the first stretching rod 17 and the second stretching rod 18 before and after the test.
Compared with the introduction content of the background technology, the tensile mechanical property testing device suitable for high-temperature vacuum is characterized in that the deformation measurement extensometer is arranged on the side surface of the environment control device, the first extension rod is used for abutting against the top end of a sample, and the second extension rod is used for abutting against the bottom end of the sample; and the stretching amount of the sample corresponds to the distance difference between the first stretching rod and the second stretching rod before and after the test. Therefore, the extension of the extension rod is changed under the high-temperature environment, the test result is not affected, and the error of the test result is reduced.
Furthermore, the stretching assembly of the sample comprises an upper chuck assembly fixedly connected with the upper connecting rod 3 in the axial direction and a lower chuck assembly fixedly connected with the lower connecting rod 6 in the axial direction; the upper chuck component comprises an upper chuck rod 10 and an upper stretching chuck 11 which is in sliding fit with the upper chuck rod along the direction vertical to the stretching direction; the lower chuck component comprises a lower chuck rod 12 and a lower stretching chuck 13 which is in sliding fit with the lower chuck rod along the direction vertical to the stretching direction; upper and lower tension grips 11 and 13 are used to secure the sample. The upper chuck rod is in sliding fit with the upper stretching chuck along the direction vertical to the stretching direction; the lower chuck rod is in sliding fit with the lower stretching chuck along the direction perpendicular to the stretching direction. During the test, through the tensile to the sample for go up tensile chuck and tensile chuck down all produce the effect of power and take place to slide along the tensile direction of perpendicular to, and then the tensile direction of automatically regulated sample makes tensile direction the same with last chuck pole and lower chuck pole direction, and then makes that the sample is better to be in two power rod states.
Further, a first groove is formed in the upper chuck rod 10, and one end of the upper stretching chuck 11 can be embedded into the first groove and can slide along the first groove; the lower chuck rod 12 is provided with a second groove, and one end of the lower stretching chuck 13 can be embedded into the second groove and can slide along the second groove. It is understood that the above-mentioned manner of providing the grooves on the upper chuck rod and the lower chuck rod is only an example of the above-mentioned sliding fit in the embodiment of the present invention, and it is also possible that one end of the upper stretching chuck 11 is provided with a first groove into which the upper chuck rod can be inserted, one end of the lower stretching chuck 13 is provided with a second groove into which the lower chuck rod can be inserted; or other slip fit means commonly used by those skilled in the art.
Further, the first groove and the second groove are dovetail grooves. It will be understood, of course, that the dovetail grooves described above are merely a preferred example of an embodiment of the present invention, and that other types of grooves, such as semi-circular grooves or circular grooves, etc., are also possible, and that dovetail grooves are simpler and more convenient to machine than semi-circular and circular grooves.
Further, the upper drawing collet 11 and the lower drawing collet 13 are each provided with a tapered protruding clip which can be inserted into a dovetail groove. It will be understood, of course, that the tapered tabs described above are merely one preferred example of a sliding fit with the dovetail grooves in the embodiments of the present invention, and may be arcuate tabs, semi-circular tabs, or ball-and-socket tabs, among others.
Further, the upper jaw assembly can rotate around the axis of the upper connecting rod 3 and/or the lower jaw assembly can rotate around the axis of the lower connecting rod 6. Specifically, the upper chuck assembly can rotate around the axis of the upper connecting rod 3; or the lower chuck component can rotate around the axis of the lower connecting rod 6; the two modes can be combined, namely the upper chuck component can rotate around the axis of the upper connecting rod 3, and the lower chuck component can rotate around the axis of the lower connecting rod 6. Through setting up above-mentioned pivoted form for the tensile direction of the sample of more convenient adjustment is parallel with the axle center of last chuck pole and lower chuck pole, and the sample of being more convenient for promptly is in two force rod states better.
Further, the direction of the sliding fit of the upper tension chuck 11 with the upper chuck bar 10 and the direction of the sliding fit of the lower tension chuck 13 with the lower chuck bar 12 intersect perpendicularly. It will be understood that the sliding engagement direction may be non-perpendicularly intersecting, but that the perpendicularly intersecting arrangement is preferred in embodiments of the present invention. Because the sliding fit directions are vertically crossed, when the upper stretching chuck and the lower stretching chuck are automatically adjusted by tensile force in the stretching process, the deviation of any angle along the circumferential direction of the upper stretching rod or the lower stretching rod can be automatically adjusted.
Further, the environment control apparatus of the apparatus includes a cabinet and a heating and heat insulating apparatus 15 provided inside the cabinet, and an upper cartridge assembly and a lower cartridge assembly are provided inside the heating and heat insulating apparatus 15. Through setting up heating and heat-proof device make, reduced the space of heating, be convenient for more rise temperature and temperature control.
Furthermore, the box body is provided with a plurality of doors. Through setting up a plurality of doors for can realize that many people assemble jointly in the test installation.
Further, a movement adjusting device 16 is provided below the environment control device. The position of the whole device can be transferred more conveniently by moving the adjusting device. It is understood that the movement adjusting device may be a roller, a sliding rail, or other means commonly used by those skilled in the art.
The tensile mechanical property testing device suitable for high-temperature vacuum provided by the invention is described in detail above. It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in an article or device that comprises the element.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (8)
1. The tensile mechanical property testing device suitable for high-temperature vacuum comprises an environment control device and a deformation measurement extensometer (8), and is characterized in that the deformation measurement extensometer (8) comprises a first extension rod (17) and a second extension rod (18), the deformation measurement extensometer (8) is arranged on the side surface of the environment control device, the first extension rod (17) is used for abutting against the top end of a sample (7), and the second extension rod (18) is used for abutting against the bottom end of the sample (7); the stretching amount of the test sample (7) corresponds to the distance difference between the first stretching rod (17) and the second stretching rod (18) before and after the test;
the stretching assembly of the sample comprises an upper chuck assembly fixedly connected with the upper connecting rod (3) in the axial direction and a lower chuck assembly fixedly connected with the lower connecting rod (6) in the axial direction;
the upper chuck component comprises an upper chuck rod (10) and an upper stretching chuck (11) which is in sliding fit with the upper chuck rod along the direction vertical to the stretching direction;
the lower chuck component comprises a lower chuck rod (12) and a lower stretching chuck (13) which is in sliding fit with the lower chuck rod along the direction vertical to the stretching direction;
the upper stretching chuck (11) and the lower stretching chuck (13) are used for fixing a sample;
the upper chuck component can rotate around the axis of the upper connecting rod (3), and the lower chuck component can rotate around the axis of the lower connecting rod (6);
when the test piece is tested, the upper stretching chuck and the lower stretching chuck generate force action and slide along the direction perpendicular to the stretching direction through stretching the test piece, and then the stretching direction of the test piece is automatically adjusted, so that the stretching direction is the same as the direction of the upper chuck rod and the direction of the lower chuck rod, and the test piece is better in a two-force rod state.
2. The tensile mechanical property testing device suitable for high-temperature vacuum according to claim 1, wherein a first groove is arranged on the upper chuck rod (10), and one end of the upper tensile chuck (11) can be embedded into the first groove and can slide along the first groove; and a second groove is formed in the lower chuck rod (12), and one end of the lower stretching chuck (13) can be embedded into the second groove and can slide along the second groove.
3. The tensile mechanical property testing device suitable for high-temperature vacuum according to claim 2, wherein the first groove and the second groove are dovetail grooves.
4. The tensile mechanical property testing device suitable for high-temperature vacuum according to claim 3, wherein the upper tensile chuck (11) and the lower tensile chuck (13) are provided with conical convex cards which can be embedded into the dovetail grooves.
5. The tensile mechanical property testing device suitable for high-temperature vacuum according to claim 1, wherein the direction of the sliding fit of the upper tensile collet (11) and the upper collet rod (10) and the direction of the sliding fit of the lower tensile collet (13) and the lower collet rod (12) are perpendicularly intersected.
6. The tensile mechanical property testing device suitable for high-temperature vacuum according to claim 1, wherein the environment control device comprises a box body and a heating and heat insulating device (15) arranged inside the box body, and the upper chuck assembly and the lower chuck assembly are arranged inside the heating and heat insulating device (15).
7. The tensile mechanical property testing device suitable for high-temperature vacuum of claim 6, wherein a plurality of doors are arranged on the box body.
8. The tensile mechanical property testing device suitable for high-temperature vacuum according to claim 6, wherein a movement adjusting device (16) is disposed below the environment control device.
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| CN201610976521.XA CN106644749B (en) | 2016-10-27 | 2016-10-27 | Tensile mechanical property testing device suitable for high-temperature vacuum |
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| CN201610976521.XA CN106644749B (en) | 2016-10-27 | 2016-10-27 | Tensile mechanical property testing device suitable for high-temperature vacuum |
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| CN113029763A (en) * | 2021-05-01 | 2021-06-25 | 吉林大学 | Composite environment magnesium alloy tensile torsion test bench |
| CN113640144A (en) * | 2021-08-10 | 2021-11-12 | 中机试验装备股份有限公司 | High-temperature extension measuring device |
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