CN117848277A - Extensometer capable of quickly changing knife edge length and measuring method - Google Patents
Extensometer capable of quickly changing knife edge length and measuring method Download PDFInfo
- Publication number
- CN117848277A CN117848277A CN202410025740.4A CN202410025740A CN117848277A CN 117848277 A CN117848277 A CN 117848277A CN 202410025740 A CN202410025740 A CN 202410025740A CN 117848277 A CN117848277 A CN 117848277A
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- extensometer
- knife edge
- extension rod
- bracket
- guide base
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 51
- 238000000691 measurement method Methods 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 2
- 238000011056 performance test Methods 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 8
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 238000001125 extrusion Methods 0.000 description 6
- 238000009778 extrusion testing Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 230000000368 destabilizing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011173 large scale experimental method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The invention relates to the technical field of material performance test, and provides an extensometer capable of quickly changing the length of a blade, and a measuring method thereof, wherein the extensometer comprises an extensometer main body, a first blade bracket, a second blade bracket, an extensometer first blade, an extensometer second blade and a blade length extension device; the first knife edge bracket and the second knife edge bracket extend out from the extensometer main body and are mutually isolated and parallel; the first knife edge of the extensometer is arranged on a knife edge length extension device which is arranged on a first knife edge bracket; the extensometer second knife edge is arranged on the second knife edge bracket; the knife edge length extension device is used for changing the position of the first knife edge of the extensometer in the extending direction of the first knife edge bracket. According to the invention, the length of the edge of the extensometer is changed, so that the longitudinal deformation between two points with step height difference can be accurately measured, the clamping position of the extensometer on a test piece can be flexibly selected, and the extensometer can be used for testing the test piece mounted in the anti-instability clamp, and has greater applicability and flexibility.
Description
Technical Field
The invention relates to the technical field of material performance testing, in particular to an extensometer capable of rapidly changing the length of a knife edge and a measuring method.
Background
In mechanical tests, it is often necessary to measure the longitudinal deformation between two points with a step height difference, for example, when measuring the deformation of a hole in a mechanical connection extrusion test, because the test piece adopts a single lap joint configuration, the step height difference exists between the two measurement points when adopting front measurement, if a conventional extensometer measurement scheme is used, the longitudinal deformation (the deformation in the length direction of the test piece) between two non-coplanar points cannot be measured, only two extensometers with inconsistent knife edge lengths can be used, and the height difference is compensated by the difference of the knife edge lengths, so that the two non-coplanar measurement points are introduced to the same measurement plane, thereby achieving the purpose of measuring the deformation by using the extensometer. However, for large-scale experiments, the step height difference is not a fixed value, and if the step height difference is compensated by simply changing the length of the knife edge, the manufacturing cost and the using cost are high.
The invention patent with publication number of CN 110553620B (an extensometer fixing device and system for measuring deformation of nail holes) discloses an extensometer fixing device which can realize hole deformation measurement of composite material connecting pieces with different thicknesses in a front measurement mode by adopting an extensometer. The device needs to fix the extensometer on the test piece through a fixed support, and the fixed support needs to be connected to the test piece in an adhesive mode, so that the method has three defects: firstly, the fixing support is connected in an adhesive mode, the performance of adhesive is good enough, and a correct adhesive process is used when the adhesive is adhered, so that the fixing support is prevented from falling off in advance due to the fact that adhesion is unstable in the test process, and hole deformation measurement data are invalid; secondly, a bonding mode is adopted, long curing time of the adhesive is needed, and for a large number of short-time test tasks, the cost of time and labor are too high, and the use is inconvenient; thirdly, for the compression test of mechanical connection extrusion, an anti-instability clamp is needed, and the extensometer is fixed in the mode, so that a fixed support or the anti-instability clamp is needed to be specially designed, and the fixed support and the anti-instability clamp can be matched with each other. And the pasting position of the fixed support needs to be accurate so as to prevent interference with the anti-instability clamp, so that the test piece cannot be installed in the anti-instability clamp. By combining the above, the method for measuring the deformation of the hole in the mechanical connection extrusion test has higher use cost and inconvenient disassembly and assembly, is not suitable for large-batch short-time test tasks, such as allowable value test tasks of the mechanical connection extrusion test, is relatively suitable for small-batch long-time test tasks, such as mechanical connection extrusion fatigue test tasks, and has certain limitation in application scenes of the invention patent.
The invention patent with publication number of CN105737790A (a device for measuring hole extrusion deformation) discloses a device for measuring the hole extrusion deformation of a mechanical connection test piece, which can realize the function of measuring the hole extrusion deformation from the side surface of the mechanical connection extrusion test piece by using an extensometer. This approach has two drawbacks: firstly, a method for measuring the extrusion deformation of a hole from the side surface of a test piece generally needs 2 extensometers to mutually coordinate and measure, and errors are eliminated by placing the extensometers left and right and taking the average value of the measured values; secondly, this approach is not suitable for compression testing of mechanical connection compression, as it interferes with compression instability prevention clamps. In view of the above, the application scenario of the invention has certain limitations.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides an extensometer capable of rapidly changing the length of a knife edge, which can be used for measuring longitudinal deformation between two points with step height difference by using the extensometer by changing the length of the knife edge of the extensometer, can flexibly select the clamping position of the extensometer on a test piece, can be used for testing the test piece arranged in an anti-instability clamp, and has greater applicability and flexibility.
The invention adopts the following technical scheme:
in one aspect, the invention provides an extensometer capable of rapidly changing the length of a blade, comprising an extensometer body, a first blade support, a second blade support, an extensometer first blade, an extensometer second blade and a blade length extension device;
the first knife edge bracket and the second knife edge bracket extend out of the extensometer main body and are mutually isolated and arranged in parallel;
the extensometer first knife edge is arranged on the knife edge length extension device, and the knife edge length extension device is arranged on the first knife edge bracket;
the extensometer second knife edge is arranged on the second knife edge bracket;
the knife edge length extension device is used for quickly changing the position of the first knife edge of the extensometer in the extending direction of the first knife edge bracket so as to realize the step height difference between the first knife edge of the extensometer and the second knife edge of the extensometer.
In any of the possible implementations described above, there is further provided an implementation, the knife edge length extension device including a guide base and an extension rod;
the guide base is provided with a guide groove, the extension rod is provided with a sliding rail matched with the guide groove, and the extension rod slides in the guide groove through the sliding rail;
the guide base is fixedly connected to the first knife edge bracket;
the first knife edge of the extensometer is arranged at the lower part of one end of the extension rod.
In any one of the possible implementations described above, there is further provided an implementation, wherein the cross-sectional shape of the extension rod is T-shaped, and the cross-sectional shape of the guide base is U-shaped.
In any of the possible implementations described above, there is further provided an implementation in which the two sides of the extension rod are provided with limiting holes, and the sliding position of the extension rod on the guide base is fixed by using a jackscrew.
In any of the possible implementations described above, there is further provided an implementation in which the front end of the extension rod has a downward protruding portion, and the extensometer first blade is mounted on a lower portion of the protruding portion by a fixing bolt.
In any one of the possible implementation manners described above, there is further provided an implementation manner, the guide base is provided with a through hole, the first knife edge support is provided with a positioning hole, one end of a fixing bolt penetrates through the positioning hole, and the other end penetrates through the through hole to fasten the guide base on the first knife edge support by using a nut.
In any of the possible implementations described above, there is further provided an implementation in which the extensometer second blade is disposed on a lower surface of the second blade holder.
On the other hand, the invention also provides a measuring method using the extensometer capable of rapidly changing the length of the knife edge, which comprises the following steps:
s1, fixedly connecting a guide base with a first knife edge bracket of an extensometer;
s2, inserting an extension rod into the guide base, and fixing a first knife edge of the extension gauge on the lower surface of the front end of the extension rod, wherein the extension rod and the first knife edge of the extension gauge form a movable assembly;
s3, the movable assembly in the step S2 freely slides in a guide base, an extension rod is adjusted to a preset test position in the guide base and fixed, so that the extensometer is vertical to the surface of the test piece, and a first edge of the extensometer and a second edge of the extensometer are in good contact with the test piece in a line contact manner;
and S4, mounting the extensometer assembled in the step S4 on a test piece to test, wherein the first edge of the extensometer and the second edge of the extensometer synchronously move along with the contact surface of the test piece.
In step S3, limiting holes are formed on two sides of the extension rod, and the extension rod is fixed at a set position on the guide base by rotating the jackscrew.
In any of the possible implementations described above, there is further provided an implementation in which the measuring method is applied to an experiment in which the extensometer measures longitudinal deformation between two points having a step height difference.
In any of the possible implementations described above, there is further provided an implementation, the measurement method being particularly suitable for testing of test pieces mounted in a destabilizing fixture.
The beneficial effects of the invention are as follows: the knife edge length extension device can quickly change the length of one knife edge in the extensometer so as to compensate the height difference between two points distributed in a step mode through the change of the length of the knife edge, thereby realizing the function of measuring the longitudinal deformation between the two points with the step height difference by using the extensometer. The device has strong applicability, can be used on a test piece with a clamp, has simple structure, light weight and low processing cost, and reduces the test cost.
Drawings
FIG. 1 is a schematic diagram showing the experimental installation position of an extensometer capable of rapidly changing the length of a knife edge according to an embodiment of the present invention.
Fig. 2 is a schematic view showing the structure (split) of an extensometer capable of rapidly changing the length of a knife edge according to an embodiment.
Fig. 3 is a schematic view showing the structure of the guide base in the embodiment.
Fig. 4 is a schematic view showing the structure of the extension rod in the embodiment.
In the figure: 1-a test piece; 2-extensometer body; 3-a first edge of the extensometer; 41-guiding the base; 42-extending rods; 43-fixing bolts; 44- (locking) jackscrews; 45- (knife edge) fixing bolts; 46-a guide groove; 47-a projection; 5-stretching the second knife edge; 6-a first knife edge bracket; 7-a second knife edge bracket.
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the technical features or combinations of technical features described in the following embodiments should not be regarded as being isolated, and they may be combined with each other to achieve a better technical effect.
As shown in fig. 1, the test piece 1 is in a lap joint configuration, and a step height difference is formed between two measured points.
As shown in fig. 2, the extensometer capable of quickly changing the length of a blade according to the embodiment of the invention comprises an extensometer main body 2, a first blade bracket 6, a second blade bracket 7, an extensometer first blade 3, an extensometer second blade 5 and a blade length extension device;
the first knife edge bracket 6 and the second knife edge bracket 7 extend out from the extensometer main body 2 and are mutually isolated and arranged in parallel;
the extensometer first knife edge 3 is arranged on the knife edge length extension device, and the knife edge length extension device is arranged on the first knife edge bracket 6;
the extensometer second knife edge 5 is arranged on the second knife edge bracket 7;
the knife edge length extension device is used for quickly changing the position of the first knife edge 3 of the extensometer in the extending direction of the first knife edge bracket 6 so as to realize the step height difference between the first knife edge 3 of the extensometer and the second knife edge 5 of the extensometer.
In one embodiment, the knife edge length extension device comprises a guide base 41 and an extension rod 42;
the guide base 41 is provided with a guide groove 46, the extension rod 42 is provided with a sliding rail matched with the guide groove 46, and the extension rod 42 slides in the guide groove 46 through the sliding rail; as shown in fig. 2-4;
the guide base 41 is fixedly connected to the first knife edge bracket 6;
the extensometer first blade 3 is disposed below one end of the extension rod 42.
In a specific embodiment, the cross-section of the extension rod 42 is T-shaped, and the cross-section of the guide base 41 is U-shaped, as shown in fig. 3 and 4.
In one embodiment, limiting holes are provided on both sides of the extension rod 42, and a top thread 44 is used to fix the sliding position of the extension rod on the guide base 41, as shown in fig. 2.
In a specific embodiment, the front end of the extension rod 42 has a downward protrusion 47, and the extensometer first blade 3 is mounted on a lower portion of the protrusion 47 by a fixing bolt 45, as shown in fig. 4.
In a specific embodiment, the guide base 41 is provided with a through hole, the first knife edge bracket 6 is provided with a positioning hole, one end of a fixing bolt 45 penetrates through the positioning hole, and the other end penetrates through the through hole to fasten the guide base 41 on the first knife edge bracket 6 by using a nut.
In a specific embodiment, the extensometer second blade 5 is disposed on a lower surface of the second blade holder 7.
The embodiment of the invention provides a measuring method of an extensometer capable of rapidly changing the length of a knife edge, comprising the following steps:
s1, fixedly connecting a guide base 41 with a first edge support 6 of an extensometer;
s2, inserting an extension rod 42 into the guide base 41, and fixing the first edge 3 of the extensometer on the lower surface of the front end of the extension rod 42, wherein the extension rod 42 and the first edge 3 of the extensometer form a movable assembly;
s3, the movable assembly in the step S2 freely slides in the guide base 41, the extension rod 42 is adjusted to a preset test position in the guide base 41 and fixed, so that the extensometer is vertical to the surface of the test piece 1, and the extensometer first knife edge 3 and the extensometer second knife edge 5 are well contacted with the test piece 1 in a line contact mode;
and S4, mounting the extensometer assembled in the step S4 on the test piece 1 to perform a test, wherein the first cutter edge 3 of the extensometer and the second cutter edge 5 of the extensometer synchronously move along with the contact surface of the test piece 1.
In a specific embodiment, in step S3, limiting holes are formed on two sides of the extension rod 42, and the extension rod 42 is fixed at a set position on the guide base 41 by rotating the jackscrew 44.
In a specific embodiment, the measuring method is applied to a test in which the extensometer measures the longitudinal deformation between two points having a step height difference.
The measuring method is particularly suitable for testing test pieces mounted in an anti-destabilization clamp.
According to the extensometer capable of rapidly changing the length of the knife edge, the length of the knife edge of the extensometer is changed, so that the extensometer can be used for measuring longitudinal deformation between two points with step height difference, the clamping position of the extensometer on a test piece can be flexibly selected, the extensometer can be used for testing the test piece mounted in the anti-instability clamp, and the extensometer has greater applicability and flexibility.
Although a few embodiments of the present invention have been described herein, those skilled in the art will appreciate that changes can be made to the embodiments herein without departing from the spirit of the invention. The above-described embodiments are exemplary only, and should not be taken as limiting the scope of the claims herein.
Claims (10)
1. An extensometer capable of rapidly changing the length of a knife edge is characterized by comprising an extensometer main body, a first knife edge bracket, a second knife edge bracket, an extensometer first knife edge, an extensometer second knife edge and a knife edge length extension device;
the first knife edge bracket and the second knife edge bracket extend out of the extensometer main body and are mutually isolated and arranged in parallel;
the extensometer first knife edge is arranged on the knife edge length extension device, and the knife edge length extension device is arranged on the first knife edge bracket;
the extensometer second knife edge is arranged on the second knife edge bracket;
the knife edge length extension device is used for quickly changing the position of the first knife edge of the extensometer in the extending direction of the first knife edge bracket so as to realize the step height difference between the first knife edge of the extensometer and the second knife edge of the extensometer.
2. The extensometer capable of rapidly changing a knife edge length according to claim 1 wherein the knife edge length extension device includes a guide base and an extension rod;
the guide base is provided with a guide groove, the extension rod is provided with a sliding rail matched with the guide groove, and the extension rod slides in the guide groove through the sliding rail;
the guide base is fixedly connected to the first knife edge bracket;
the first knife edge of the extensometer is arranged at the lower part of one end of the extension rod.
3. The extensometer capable of quickly changing the length of a knife edge according to claim 2 wherein the cross-sectional shape of the extension rod is T-shaped and the cross-sectional shape of the guide base is U-shaped.
4. The extensometer of claim 2 wherein limiting holes are provided on both sides of the extension rod to fix its sliding position on the guide base using a jackscrew.
5. A rapid knife edge changing extensometer according to claim 3 wherein the forward end of the extension rod has a downward projection, the extensometer first knife edge being mounted to the lower portion of the projection by a fixing bolt.
6. A extensometer capable of rapidly changing a knife edge length according to claim 3 wherein the guide base is provided with a through hole, the first knife edge support is provided with a positioning hole, one end of a fixing bolt penetrates through the positioning hole, and the other end penetrates through the through hole to fasten the guide base on the first knife edge support by a nut.
7. The extensometer of claim 1 wherein the extensometer second blade is disposed on a lower surface of the second blade support.
8. A measurement method using the extensometer capable of rapidly changing a length of a blade according to any one of claims 1 to 7, wherein the measurement method includes:
s1, fixedly connecting a guide base with a first knife edge bracket of an extensometer;
s2, inserting an extension rod into the guide base, and fixing a first knife edge of the extension gauge on the lower surface of the front end of the extension rod, wherein the extension rod and the first knife edge of the extension gauge form a movable assembly;
s3, the movable assembly in the step S2 freely slides in a guide base, an extension rod is adjusted to a preset test position in the guide base and fixed, so that the extensometer is vertical to the surface of the test piece, and a first edge of the extensometer and a second edge of the extensometer are in good contact with the test piece in a line contact manner;
and S4, mounting the extensometer assembled in the step S4 on a test piece to test, wherein the first edge of the extensometer and the second edge of the extensometer synchronously move along with the contact surface of the test piece.
9. The measuring method according to claim 8, wherein in step S3, limiting holes are provided on both sides of the extension rod, and the extension rod is fixed at a set position on the guide base by rotating the jackscrew.
10. The measuring method according to claim 8, wherein the measuring method is applied to an experiment in which the extensometer measures the longitudinal deformation between two points having a step height difference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410025740.4A CN117848277A (en) | 2024-01-08 | 2024-01-08 | Extensometer capable of quickly changing knife edge length and measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410025740.4A CN117848277A (en) | 2024-01-08 | 2024-01-08 | Extensometer capable of quickly changing knife edge length and measuring method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117848277A true CN117848277A (en) | 2024-04-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410025740.4A Pending CN117848277A (en) | 2024-01-08 | 2024-01-08 | Extensometer capable of quickly changing knife edge length and measuring method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117848277A (en) |
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2024
- 2024-01-08 CN CN202410025740.4A patent/CN117848277A/en active Pending
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