CN211477030U - Creep strain direct measurement device - Google Patents
Creep strain direct measurement device Download PDFInfo
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- CN211477030U CN211477030U CN202020451230.0U CN202020451230U CN211477030U CN 211477030 U CN211477030 U CN 211477030U CN 202020451230 U CN202020451230 U CN 202020451230U CN 211477030 U CN211477030 U CN 211477030U
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- 238000005259 measurement Methods 0.000 title claims abstract description 31
- 239000013307 optical fiber Substances 0.000 claims abstract description 69
- 230000001419 dependent effect Effects 0.000 claims description 8
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 239000000565 sealant Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 15
- 239000000463 material Substances 0.000 abstract description 10
- 238000001514 detection method Methods 0.000 abstract description 3
- 239000000835 fiber Substances 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 238000013001 point bending Methods 0.000 description 12
- 238000009434 installation Methods 0.000 description 7
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007373 indentation Methods 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 238000003889 chemical engineering Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Abstract
The utility model discloses a creep strain direct measurement device, the device includes: the support frame is used for placing a sample; a load generator provided corresponding to the sample and configured to apply a load to the sample to deform the sample; and the optical fiber sensor is connected with the sample and used for detecting the strain quantity of the sample deformation. The utility model discloses a thereby the creep performance of the material is confirmed to the fiber sensor detection sample strain of direct mount on the sample, realizes carrying out direct measurement to little sample creep strain, overcomes traditional method and can only realize drawing measured defect indirectly.
Description
Technical Field
The utility model relates to a measure technical field, especially relate to a creep strain direct measurement device.
Background
Along with the higher requirements on the exhaustion of energy resources and energy conservation and emission reduction, the operating parameters (temperature and pressure) of equipment are continuously improved in the process industry fields with high energy consumption such as electric power, chemical engineering, metallurgy and the like, and along with the higher requirements on the service performance of equipment materials. Even if the material with excellent performance is used for a long time under high temperature and high pressure, the structure can be degraded even if the load is not increased, so that irreversible creep can be generated, and the integrity of a high-temperature structure is seriously threatened due to the influence of some unpredictable external load. Therefore, the creep property of the material of the service component is dynamically detected, and the creep property detection method has important significance for ensuring the safe and stable operation of high-temperature equipment.
The creep property of the material is evaluated, a common method is to sample and carry out uniaxial creep test on a standard sample, but the standard sample needs more materials and can damage original equipment, so that the creep test technology of a small sample is developed to meet engineering requirements. The small sample creep test requires small sample volume, and can be directly sampled from a service component. At present, small sample creep test methods at home and abroad are various, such as a small-size single-axis test, a small punch test, a shear punching test, an indentation test, a three-point bending test, a cantilever beam test, a fixed support straight rod bending test, a circular ring test, a double-rod test and the like. In the above test method, the deformation of the sample in the other tests is bending deformation, except for the uniaxial deformation of the sample in the small-size uniaxial test, the indentation test and the double-rod test.
When the creep property of the material is evaluated by a small sample method, in the test process, the creep property is influenced by the size of a sample, and the creep property of the material is generally evaluated by adopting an indirect method for measurement, or adopting an extension measurement method, or taking the displacement of the movement of a load point as the deformation of the sample, and then inverting the creep property parameters of the material according to the established model formula. The small punch test is developed relatively mature at present, corresponding standard guidance is provided at home and abroad, and the deformation of a sample to be measured is specified in the aspect of measuring the deformation, wherein the European Union standard CEN CWA 156272007 metal material small punch test method provides a method for guiding the deformation measurement of the sample, a guide rod is contacted with the bottom of the sample, and the position of the guide rod is changed along with the deformation of the sample in the test process, so that the measurement of the deformation of the sample is realized, the deformation is the deformation of the bottom of the sample, but the method is an indirect extension measurement method and cannot realize the direct measurement of the deformation strain of the sample.
In addition, the measurement of the bending deformation amount is that the displacement of the load point is approximate to the deformation amount of the sample, the measurement of the deformation amount of the sample cannot be realized because the uniaxial deformation amount is limited by the size and the high temperature of the sample, and the direct measurement of the deformation strain amount of the sample cannot be realized by adopting the indirect measurement mode of the displacement of the load point.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a creep deformation direct measurement device to realize the dependent variable that the direct measurement sample warp.
In order to achieve the above object, the utility model provides a following scheme:
a creep strain direct measurement apparatus, the apparatus comprising:
the support frame is used for placing a sample;
a load generator provided corresponding to the sample and configured to apply a load to the sample to deform the sample;
and the optical fiber sensor is connected with the sample and used for detecting the strain quantity of the sample deformation.
Optionally, the apparatus further comprises:
the demodulation device is connected with the optical fiber sensor and is used for demodulating the dependent variable;
and the data terminal is connected with the demodulation device and used for storing and displaying the demodulated dependent variable.
Optionally, the apparatus further comprises:
and the high-temperature furnace is used for placing the sample, the load generator, the optical fiber sensor and the support frame.
Optionally, when the sample is a cantilever sample with an asymmetric center, the optical fiber sensors are mounted at the top of the cantilever sample, the distance between the optical fiber sensors and the size mutation position of the cantilever sample is 1mm, and the number of the optical fiber sensors is 1.
Optionally, when the sample is a centrosymmetric small plunger sample, the optical fiber sensors are mounted at the bottom of the small plunger sample and symmetrically arranged along the central line of the small plunger sample, the distance between the optical fiber sensors is the same as the diameter of the circular plunger, and the number of the optical fiber sensors is 2.
Optionally, when the sample is a three-point bending sample, the optical fiber sensors are mounted at the bottom of the three-point bending sample and located at the center line of the three-point bending sample, and the number of the optical fiber sensors is 1.
Optionally, when the sample is a four-point bending sample, the optical fiber sensors are mounted at the bottom of the four-point bending sample and located at the center line of the four-point bending sample, and the number of the optical fiber sensors is 1.
Optionally, when the optical fiber sensor is used for measuring room temperature creep, the optical fiber sensor is connected with the sample by using epoxy resin or sealant; and when the optical fiber sensor is used for measuring high-temperature creep, connecting the optical fiber sensor and the test sample by adopting a spot welding joint mode.
According to the utility model provides a concrete embodiment, the utility model discloses a following technological effect:
the utility model discloses a creep strain direct measurement device, the device includes: the support frame is used for placing a sample; a load generator provided corresponding to the sample and configured to apply a load to the sample to deform the sample; and the optical fiber sensor is connected with the sample and used for detecting the strain quantity of the sample deformation. The utility model discloses a thereby the creep performance of the material is confirmed to the fiber sensor detection sample strain of direct mount on the sample, realizes carrying out direct measurement to little sample creep strain, overcomes traditional method and can only realize drawing measured defect indirectly.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments 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 for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a structural diagram of a creep strain direct measurement apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic view of an installation position of a cantilever beam sample optical fiber sensor according to an embodiment of the present invention;
fig. 3 is a schematic view of the installation position of the small punch sample optical fiber sensor according to the embodiment of the present invention;
fig. 4 is a schematic view of the installation position of a three-point bending sample optical fiber sensor according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an installation position of a four-point bending sample optical fiber sensor according to an embodiment of the present invention;
FIG. 6 is a schematic view of an installation method of a room temperature creep optical fiber sensor according to an embodiment of the present invention;
fig. 7 is a schematic view of a mounting method of a high temperature creep optical fiber sensor according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model aims at providing a creep deformation direct measurement device to realize the dependent variable that the direct measurement sample warp.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
Fig. 1 is the utility model provides a creep strain direct measurement device structure picture, as shown in fig. 1, the utility model provides a creep strain direct measurement device, include: a support frame 7, a load generator and an optical fiber sensor 4; the support frame 7 is used for placing the test sample 2; the load generator is arranged corresponding to the sample 2, and is used for applying a load 3 to the sample 2 and deforming the sample 2; the optical fiber sensor 4 is connected to the sample 2, and the optical fiber sensor 4 is used for detecting the strain amount of the sample 2.
As an optional implementation, the apparatus of the present invention further comprises: a demodulation apparatus 1 and a data terminal 6; the demodulation device 1 is connected with the optical fiber sensor 4, and the demodulation device 1 is used for demodulating the dependent variable; the data terminal 6 is connected with the demodulation device 1 through a signal wire 5, and the data terminal 6 is used for storing and displaying the demodulated dependent variable; the data terminal 6 is an upper computer.
As an optional implementation, the apparatus of the present invention further comprises:
and the high-temperature furnace 8 is used for placing the test sample 2, the load generator, the optical fiber sensor 4 and the support frame 7.
As an optional implementation manner, the optical fiber sensor 4 of the present invention is an optical fiber grating sensor.
Determination of the strain measurement position of sample 2:
the mounting position of the optical fiber sensor 4 is slightly different for different specimen types. When the sample 2 is a cantilever sample 9 with an asymmetric center, the optical fiber sensors 4 are installed on the top of the cantilever sample 9, the distance 10 between the optical fiber sensors and the size mutation position of the cantilever sample 9 is 1mm, and the number of the optical fiber sensors 4 is 1, as shown in fig. 2 specifically; when the sample 2 is a centrosymmetric small plunger sample 11, the optical fiber sensors 4 are mounted at the bottom of the small plunger sample 11 and symmetrically arranged along the central line of the small plunger sample 11, the distance 13 is the same as the diameter of the circular plunger 12, and the number of the optical fiber sensors 4 is 2, as shown in fig. 3 specifically; when the sample 2 is the three-point bending sample 14, the optical fiber sensors 4 are mounted at the bottom of the three-point bending sample 14 and located at the center line of the three-point bending sample 14, and the number of the optical fiber sensors 4 is 1, as shown in fig. 4 specifically; when the test sample 2 is a four-point bent test sample 15, the optical fiber sensors 4 are mounted at the bottom of the four-point bent test sample 15 and located at the center line of the four-point bent test sample 15, and the number of the optical fiber sensors 4 is 1, as shown in fig. 5.
Installation of the optical fiber sensor 4:
as an embodiment, when the optical fiber sensor 4 is used for measuring room temperature creep, the optical fiber sensor 4 and the sample 2 are connected by using epoxy resin or sealant 16, as shown in fig. 6; when the optical fiber sensor 4 is used for measuring high temperature creep, the optical fiber sensor 4 and the test specimen 2 are connected by means of spot welding joints 17, as shown in fig. 7.
And (3) repeatability checking:
and after the optical fiber sensor 4 is installed, slowly applying and removing the load 3. In the loading process, whether signal display exists in the demodulation device 1 or not is checked, and if the signal display exists, the connection is normal; and meanwhile, checking the repeatability of the signals in the loading and unloading processes, if the signals in the demodulating device 1 are the same or not more than 1% when the signals are loaded and unloaded to the same load 3, indicating that the repeatability check is passed, and otherwise, rechecking the connecting line.
And (3) strain measurement:
and after the optical fiber sensor 4 is installed, carrying out the work of checking the measuring position of the sample 2, and measuring the actual distance for installing the optical fiber sensor 4. For the sample with asymmetric center, the deviation of the installation distance 10 of the optical fiber sensor is kept within plus or minus 0.2%, and for the sample with symmetric center, the optical fiber sensor 4 is ensured to be positioned at the center line of the sample 2.
After the verification of the position to be measured is finished, the temperature of the sample 2 is raised, the load 3 is applied after the temperature is stabilized, and the measurement of the strain of the sample 2 is started. The strain in the sample 2 changes, the optical fiber sensor 4 transmits the collected strain amount to the demodulation device 1, and the signal is demodulated and then transmitted to the data terminal 6 for storage, analysis and display.
The utility model discloses in load generator comprises pressure head and depression bar, optical fiber sensor 4 comprises optic fibre base member, cladding and outside protective layer.
The present invention is directed to a demodulation apparatus 1 that can perform data demodulation functions, and therefore does not limit the specific model or composition.
The utility model discloses a direct measurement device of little sample creep strain measures, has solved current little sample creep deformation extensometer measure and load point displacement approximation can't realize sample creep strain direct measurement's problem, provides a creep strain direct measurement method that application scope is wide, the conformity degree is high.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principle and the implementation of the present invention are explained herein by using specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (8)
1. A creep strain direct measurement apparatus, the apparatus comprising:
the support frame is used for placing a sample;
a load generator provided corresponding to the sample and configured to apply a load to the sample to deform the sample;
and the optical fiber sensor is connected with the sample and used for detecting the strain quantity of the sample deformation.
2. The creep strain direct measurement apparatus according to claim 1, further comprising:
the demodulation device is connected with the optical fiber sensor and is used for demodulating the dependent variable;
and the data terminal is connected with the demodulation device and used for storing and displaying the demodulated dependent variable.
3. The creep strain direct measurement apparatus according to claim 2, further comprising:
and the high-temperature furnace is used for placing the sample, the load generator, the optical fiber sensor and the support frame.
4. The creep strain direct measuring apparatus according to claim 1, wherein when the specimen is a cantilever specimen of a central asymmetric type, the optical fiber sensors are installed on top of the cantilever specimen at a distance of 1mm from a size discontinuity of the cantilever specimen, and the number of the optical fiber sensors is 1.
5. The creep strain direct measuring device according to claim 1, wherein when the sample is a small punch sample of a centrosymmetric type, the optical fiber sensors are installed at the bottom of the small punch sample and symmetrically arranged along the center line of the small punch sample at the same interval as the diameter of the circular punch ball, and the number of the optical fiber sensors is 2.
6. The creep strain direct measuring apparatus according to claim 1, wherein when the test specimen is a three-point bend test specimen, the optical fiber sensors are mounted on the bottom of the three-point bend test specimen at the center line of the three-point bend test specimen, and the number of the optical fiber sensors is 1.
7. The creep strain direct measuring device according to claim 1, wherein when the test specimen is a four-point bend test specimen, the optical fiber sensors are mounted on the bottom of the four-point bend test specimen at the center line of the four-point bend test specimen, and the number of the optical fiber sensors is 1.
8. The creep strain direct measuring apparatus according to claim 1, wherein when the optical fiber sensor is used for measuring creep at room temperature, the optical fiber sensor is connected to the test specimen using an epoxy resin or a sealant; and when the optical fiber sensor is used for measuring high-temperature creep, connecting the optical fiber sensor and the test sample by adopting a spot welding joint mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020451230.0U CN211477030U (en) | 2020-03-24 | 2020-03-24 | Creep strain direct measurement device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020451230.0U CN211477030U (en) | 2020-03-24 | 2020-03-24 | Creep strain direct measurement device |
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| CN211477030U true CN211477030U (en) | 2020-09-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111238391A (en) * | 2020-03-24 | 2020-06-05 | 中国特种设备检测研究院 | Creep strain direct measurement device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111238391A (en) * | 2020-03-24 | 2020-06-05 | 中国特种设备检测研究院 | Creep strain direct measurement device |
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Granted publication date: 20200911 |