CN112665978B - Strain testing device and mounting method thereof - Google Patents
Strain testing device and mounting method thereof Download PDFInfo
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- CN112665978B CN112665978B CN202011394986.7A CN202011394986A CN112665978B CN 112665978 B CN112665978 B CN 112665978B CN 202011394986 A CN202011394986 A CN 202011394986A CN 112665978 B CN112665978 B CN 112665978B
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Abstract
The invention relates to a strain testing device and a mounting method thereof. The strain test device includes: extensometer sensors, reeds, springs and tension rods; one end of the extensometer sensor is provided with an extensometer arm, and the end part of the extensometer arm is provided with a groove; the one end of reed is equipped with the clip, the clip is used for colluding when meeting an emergency the test and is in the recess, the other end of reed is connected with the board of bending, the pull rod passes behind the board of bending along the length direction setting of reed, just the spring housing is established on the pull rod, one end butt is in bend on the board, other end butt is on the clamp plate, the clamp plate is close to the one end of spring with the pull rod is connected. The strain testing device is simple in structure and convenient to use, and can stably fix the extensometer sensor and the extensometer arm in a small space.
Description
Technical Field
The invention relates to the technical field of strain testing, in particular to a strain testing device and an installation method thereof.
Background
The current common composite laminate compression test has small operation space, for example, the working section length of a sample in ASTM D6641 Standard test method for measuring the compression performance of a Polymer-based composite laminate by using a Combined Load Compression (CLC) test jig is 13mm, the distance between an upper clamp and a lower clamp after the sample is placed on the compression jig is 13mm, although a notch for installing an extensometer is reserved in the design of the existing clamp, the extensometer cannot be operated to be fixed on the sample due to too small space, so that a method for sticking a strain gauge is usually adopted when the compression modulus is tested at present. The sticking quality of the strain gauge has great influence on the reliability of measurement, the sticking position and the azimuth angle are inaccurate, bubbles are stuck on the sticking surface and are not firm, the phenomena such as short circuit and open circuit directly influence the detection process and the result, the sticking process is complicated, the detection efficiency is influenced, and meanwhile, the requirement on personnel is high.
The existing method for testing the compression modulus of the composite laminated plate in a small space generally adopts a mode of pasting a strain gauge, and the process is complicated and time-consuming, so that the requirement on personnel is high. The extensometer can directly carry out strain test, but the extensometer cannot be operated and fixed due to small space and hands.
The improved extensometer mounting method is additionally provided with a fixing device, the extensometer is placed on one side of a sample, an extensometer arm leans against the sample, the other side of the sample controls a reed under a large space outside a clamp to enable a clasp to hook the extensometer arm in a small space, a pull rod is pulled out to compress a spring, the reed moves, the clasp tensions the extensometer, and strain testing is conveniently and quickly carried out.
Disclosure of Invention
(1) Technical problem to be solved
A first aspect of an embodiment of the present invention provides a strain testing apparatus, including: extensometer sensor, reed, spring and pull rod. The extensometer sensor and the extensometer arm can be stably fixed in a small space.
The second aspect of the embodiment of the invention provides a method for installing a strain testing device, which comprises the steps of placing an extensometer arm on one side of a sample to be tested, and placing a reed on the other side of the sample to be tested; pressing the reed to place the clasp in the groove of the extensometer arm; loosening the reed, and pulling out the pull rod until the clasp clasps the extensometer arm; the strain test is started. The method has the advantages of strong universality, accurate and convenient test and simple and quick operation.
(2) Technical scheme
A first aspect of an embodiment of the present invention provides a strain testing apparatus, including: the extensometer comprises an extensometer sensor, a reed, a spring and a pull rod; one end of the extensometer sensor is provided with an extensometer arm, and the end part of the extensometer arm is provided with a groove; the one end of reed is equipped with the clip, the clip is used for colluding when meeting an emergency the test and is in the recess, the other end of reed is connected with the board of bending, the pull rod passes behind the board of bending along the length direction setting of reed, just the spring housing is established on the pull rod, one end butt is in bend on the board, other end butt is on the clamp plate, the clamp plate is close to the one end of spring with the pull rod is connected.
Furthermore, a handle is arranged at one end, far away from the pressing plate, of the pull rod.
Furthermore, the extensometer arm and the reeds are both provided with two reeds, and the two reeds are both arranged corresponding to the grooves on the extensometer arm.
Further, two extensometer arms are arranged in parallel.
Further, the bending direction of the clasp faces to the side far away from the pull rod.
Furthermore, a locking device is further sleeved on the pull rod and used for fixing the pull rod and the bending plate together.
Furthermore, the reed and the bending plate are integrally formed.
Further, the extensometer sensor is connected with a mechanical testing machine.
A second aspect of the embodiments of the present invention provides a method for mounting a strain gauge apparatus, which is used for mounting the strain gauge apparatus according to any one of the first aspect of the embodiments of the present invention, and includes the following steps:
placing an extensometer arm on one side of a sample to be tested, and placing a reed on the other side of the sample to be tested;
pressing the reed to place the clasp in the groove of the extensometer arm;
loosening the reed, and pulling out the pull rod until the clasp fastens the extensometer arm;
the strain test is started.
Further, in the process of strain testing, the pull rod and the bending plate are locked.
(3) Advantageous effects
According to the invention, a reed and a clasp arranged at the front end of the reed are selected, the characteristics of high structural strength and flexibility of the reed are utilized, the reed penetrates through one end of a sample to be tested and then is hooked with a groove on an extensometer arm, and then the extensometer sensor 1 and the extensometer arm 2 can be ensured to be stably contacted with the sample to be tested under the action of the elastic force of a spring and the pull force of a pull rod, so that the strain of the sample to be tested can be stably sensed. The strain testing device provided by the embodiment of the invention has the advantages of simple structure and convenience in use, and can stably fix the extensometer sensor and the extensometer arm in a small space.
In addition, the strain testing device in a small space and the mounting method thereof have the advantages of strong universality, accurate and convenient testing and simple and rapid operation, and avoid the time consumption and the complexity of pasting the strain gauge.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below 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 creative efforts.
Fig. 1 is a schematic structural diagram of a strain testing apparatus according to an embodiment of the invention.
Fig. 2 is a schematic structural diagram of a groove according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a strain testing apparatus according to an embodiment of the invention.
FIG. 4 is a structural diagram illustrating a state of a strain gauge in an embodiment of the present invention.
In the figure: extensometer sensor 1, extensometer arm 2, clip 3, reed 4, spring 5, pull rod 6, clamp plate 7, locking device 8, recess 9, handle 10.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, i.e., the invention is not limited to the embodiments described, but covers any modifications, alterations, and improvements in the parts, components, and connections without departing from the spirit of the invention.
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict.
A strain gauge apparatus according to a first aspect of an embodiment of the present invention, as illustrated with reference to fig. 1-4, includes: the extensometer sensor 1, the reed 4, the spring 5 and the pull rod 6; one end of the extensometer sensor 1 is provided with an extensometer arm 2, and the end part of the extensometer arm 2 is provided with a groove 9; the one end of reed 4 is equipped with clip 3, clip 3 is used for colluding when meeting an emergency the test and is in the recess 9, the other end of reed 4 is connected with the board of bending, pull rod 6 passes behind the board of bending along the length direction setting of reed 4, just 5 covers of spring are established on pull rod 6, one end butt is in on the board of bending, other end butt is on clamp plate 7, clamp plate 7 is close to the one end of spring 5 with pull rod 6 is connected.
In the prior art, a conventional extensometer consists of a sensor 1 and an extensometer arm 2, in order to solve the problem that the extensometer cannot be installed in a small space in the conventional extensometer strain test process, the extensometer sensor 1 and the extensometer arm 2 are arranged on one side of a sample to be tested, wherein the extensometer arm 2 is provided with a groove 9; the other side of the sample to be tested is provided with a reed 4, a spring 5, a pull rod 6, a pressure plate 7 and other structures (shown in figures 1 to 3 in particular), the reed 4 is generally of a sheet structure made of metal, one end of the reed can be bent under the action of external force, and then the clasp 3 at one end can be driven to change the position, and after the external force disappears, the reed 4 can be restored to the initial position. Therefore, taking fig. 1 as an example for illustration, in the embodiment of the present invention, the hook 3 is disposed at one end of the spring 4, an acting force is applied to the spring 4 to one side of the spring 5, the spring 4 is bent inward, and the hook 3 is further driven to be bent inward, and when the spring 4 is long enough, the spring can be deep into a deep and narrow space, and the hook 3 can be easily hooked in the groove 9, so that the extensometer sensor 1 and the extensometer arm 2 can be fixed on a sample to be tested, and the fixing work of the strain test can be realized. Meanwhile, in order to ensure that the extensometer sensor 1 and the extensometer arm 2 are stably fixed on a sample to be tested, the spring 5 is arranged on one side of the spring 4, the pressing plate 7 is arranged at the end part of the spring 5, the pressing plate 7 can be contacted with the sample to be tested during strain testing, the other end of the spring 5 abuts against the bending plate, and after the clasp 3 is hooked in the groove 9, the spring 5 stretches to drive the bending plate, the spring 4 and the clasp 3 to move towards one side far away from the sample to be tested, so that the extensometer sensor 1 and the extensometer arm 2 can stably abut against the sample to be tested, and the extensometer sensor 1 can stably and reliably receive strain information of the sample to be tested.
In addition, the embodiment of the invention is also provided with a pull rod 6, the length of the spring 5 can be changed in the length direction of the spring 4 and the spring 5 by the pull rod 6, the spring 5 can be compressed by pulling the pull rod 6 rightwards in the attached drawing 1, the spring 4 moves rightwards, and the hook 3 tensions the extensometer arm 2, so that the extensometer sensor 1 and the extensometer arm 2 can be stably connected with a sample to be tested more firmly.
In summary, in the embodiment of the present invention, the reed 4 and the clasp 3 disposed at the front end of the reed are selected, the reed 4 penetrates through one end of the sample to be tested and then hooks with the groove 9 on the extensometer arm 2 by using the characteristics of high structural strength and flexibility of the reed 4, and then the extensometer sensor 1 and the extensometer arm 2 can be ensured to stably contact with the sample to be tested under the elastic force of the spring 5 and/or the tensile force of the pull rod 6, so as to stably sense the strain of the sample to be tested. The strain testing device provided by the embodiment of the invention has the advantages of simple structure and convenience in use, and can stably fix the extensometer sensor 1 and the extensometer arm 2 in a small space.
Furthermore, a handle 10 is arranged at one end of the pull rod 6 far away from the pressure plate 7. As shown in fig. 1 and 3, a pull handle is provided to facilitate adjustment of the pull rod 6.
According to a further embodiment of the first aspect of the embodiments of the present invention, there are two of the extensometer arm 2 and the spring plate 4, and the two spring plates 4 are arranged corresponding to the grooves 9 on the extensometer arm 2. Referring to fig. 1-4, when two extensometer arms 2 and two reeds 4 are provided, the hook 3 at the front end of each of the two reeds 4 can be hooked with the corresponding groove 9 on one extensometer arm 2, and the two reeds 4 can improve the stability of hooking and the uniformity of stress on the extensometer sensor 1.
Further, the two extensometer arms 2 are arranged in parallel, as shown in fig. 1 to 4, when the two extensometer arms 2 are arranged in parallel, the reed 4 exerts force on the extensometer arms from the parallel direction, so that the extensometer sensor 1 is in flat contact with a sample to be tested, and the uniformity of the force between the extensometer sensor 1 and the sample to be tested is ensured.
Specifically, the bending direction of the clasp 3 faces to the side away from the pull rod 6, which is shown in fig. 1, 3 and 4. In attached drawings 1, 3 and 4, the clasp 3 on the left side of the reed 4 is bent towards the upper side and the lower side respectively, when external force is applied inwards (namely towards one side of the spring 5) on the reed 4, the clasp 3 at one end of the reed 4 is also bent inwards, and then the reed can conveniently enter a small space to be hooked with the groove 9, so that the purpose of fixing the extensometer sensor 1 and the extensometer arm 2 on a sample to be tested is achieved.
According to another embodiment of the first aspect of the embodiments of the present invention, a locking device 8 is further sleeved on the pull rod 6, and the locking device 8 is used for fixing the pull rod 6 and the bending plate together. Referring to fig. 1-4, in the embodiment of the present invention, after the hook 3 is hooked with the groove 9, and the pull rod 6 is pulled to one end away from the extensometer sensor 1, the spring 5 is compressed, and the reed 4, the hook 3, the extensometer arm 2, and the extensometer sensor 1 are pulled by the elastic force of the spring 5 which is sequentially compressed, so that the extensometer sensor 1 and the extensometer arm 2 stably and reliably contact with a sample to be tested, however, the pull rod 6 is not in a stable state under the elastic force of the spring 5, and therefore, the locking device 8 is arranged, so that the pull rod 6 and the bending plate are fixed together, and the bending plate and the press plate 7 stably clamp the spring 5 from both ends, so that the extensometer sensor 1 and the extensometer arm 2 can stably and reliably contact with the sample to be tested, and a strain test is achieved.
Further, locking device 8 can be the nut, and the nut cover is established on pull rod 6 to with 6 threaded connection of pull rod, the one end of nut supports the one end at the board of bending, makes pull rod 6 can not resume the one end that is close to extensometer sensor 1 under the elastic force effect of spring 5, can realize the purpose of locking.
Specifically, the reed 5 and the bending plate can be integrally formed, and when the reed 5 and the bending plate are integrally formed, the overall structural strength can be improved.
In particular, the extensometer sensor 1 may be connected to a mechanical testing machine. After the extensometer sensor 1 is connected with the mechanical testing machine, the extensometer sensor 1 transmits detected data to the mechanical testing machine, and the mechanical testing machine performs analysis and calculation, so that the mechanical property of a sample to be tested can be distinguished.
According to a second aspect of the embodiments of the present invention, a method for mounting a strain testing device is provided, which is used for mounting on the strain testing device according to any one of the first aspect of the embodiments of the present invention, and comprises the following steps:
firstly, placing an extensometer arm 2 on one side of a sample to be tested, and placing a reed 4 on the other side of the sample to be tested;
secondly, pressing the reed 4 to enable the clasp 3 to be placed in the groove 8 of the extensometer arm 2;
then, the reed 4 is loosened, and the pull rod 6 is pulled out until the clasp 3 fastens the extensometer arm 2;
finally, the strain test is started.
In the embodiment of the invention, firstly, the extensometer arm 2 is arranged on one side of a sample to be tested, and the reed 4 is arranged on the other side of the sample to be tested, so that the extensometer arm 2 can be connected with the extensometer by utilizing the slender characteristic of the reed 4 after penetrating through a small space, and the problem that the extensometer sensor 1 and the extensometer arm 2 are difficult to fix in the small space in the prior art is solved; secondly, pressing the reed 4 to enable the clasp 3 to be placed in a groove 8 of the extensometer arm 2, and after the clasp 3 is connected with the groove 8, fixing the extensometer sensor 1 and the extensometer arm 2 on a sample to be tested by the reed 4 on one side of the sample to be tested; then, the reed 4 is loosened, the pull rod 6 is pulled out until the clasp 3 is fastened on the extensometer arm 2, after the pull rod 6 is pulled out, the pull rod 6 drives the spring 5 to move towards one side far away from the extensometer arm 2, so that the reed 4 is driven, the clasp 3 moves towards one side far away from the extensometer arm 2 together, then the clasp 3 drives the extensometer arm 2 to move towards the direction close to the sample to be tested, so that the extensometer sensor 1 and the extensometer arm 2 are stably and reliably close to the sample to be tested, the purpose of measuring the strain of the sample to be tested can be realized, and the extensometer sensor 1 can be used for strain testing after the steps are completed.
In summary, in the strain testing method shown in the embodiment of the present invention, the spring plate 4 and the clasp 3 disposed at the front end of the spring plate are selected, the spring plate 4 has high structural strength and is easily bent, and the spring plate 4 passes through one end of the sample to be tested and then is hooked with the groove 9 on the extensometer arm 2, and then the extensometer sensor 1 and the extensometer arm 2 can be ensured to be stably contacted with the sample to be tested under the elastic force of the spring 5 and/or the tensile force of the pull rod 6, so that the strain of the sample to be tested can be stably sensed. The strain testing method of the embodiment of the invention has simple and convenient testing process, and after being matched with the strain testing device of the first aspect of the embodiment of the invention for use, the extensometer sensor 1 and the extensometer arm 2 can be stably contacted with a sample to be tested in a small space, thereby facilitating the subsequent strain testing.
Further, in the process of strain testing, the pull rod 6 and the bending plate are locked. As described in the first aspect of the embodiment of the present invention, in the embodiment of the present invention, after the hook 3 is hooked with the groove 9, after the pull rod 6 is pulled to one end away from the extensometer sensor 1, the spring 5 is compressed, and the reed 4, the hook 3, the extensometer arm 2 and the extensometer sensor 1 are pulled by the elastic force of the spring 5 which is sequentially compressed, so that the extensometer sensor 1 and the extensometer arm 2 stably and reliably contact with a sample to be tested, however, at this time, the pull rod 6 is not in a stable state under the elastic force of the spring 5, and then, after the pull rod 6 is pulled to a certain position, the pull rod 6 and the bending plate are locked, and the bending plate and the press plate 7 stably clamp the spring 5 from both ends, so that the extensometer sensor 1 and the extensometer arm 2 can stably and reliably contact with the sample to be tested, thereby implementing a strain test. Specifically, a locking device 8 can be further sleeved on the pull rod 6, the locking device 8 is used for fixing the pull rod 6 and the bending plate together, the locking device 8 is arranged, the pull rod 6 and the bending plate are fixed together, the bending plate and the pressing plate 7 stably clamp the spring 5 from two ends, and therefore the extensometer sensor 1 and the extensometer arm 2 can be stably and reliably contacted with a sample to be tested, and strain testing is achieved.
The following describes a strain test device and a method for mounting the strain test device according to an embodiment of the present invention.
First, the extensometer sensor 1 is connected to a mechanical testing machine for measuring strain, and the extensometer arm 2 is fitted with a recess 9 for the sample to be tested, as shown in the top view of fig. 2.
The strain testing device further comprises a locking device 8, a reed 4 with a clasp 3, a spring 5, a pull rod 6 and a pressing plate 7, wherein the spring 5 is sleeved on the pull rod 6, and the pull rod 6 is fixed on the pressing plate 7.
The extensometer arm 2 is placed on one side of a sample to be tested and leans against the sample to be tested, the pressing plate 7 is placed on the other side of the sample to be tested, the reed 4 is pressed outside the clamp by hand to enable the clasp 3 to be placed in the groove 9 of the extensometer arm 2, the reed 4 is loosened, the pressing plate 7 moves the compression spring 5 along with the pull rod 6 after the pull rod 6 is pulled out, the reed 4 is stressed to move towards the direction far away from the sample to be tested until the clasp 3 fastens the extensometer arm 2, then the locking device 8 is locked, and the extensometer sensor 1 and the extensometer arm 2 are fixed on one side of the sample to be tested to measure strain.
After the strain is measured, the pull rod 6 is pushed in to loosen the clasp 3, the reed 4 is pressed to remove the clasp 3, and the extensometer sensor 1, the extensometer arm 2 and other components are removed.
The embodiment of the invention provides a strain testing device in a small space and an installation method thereof, and the strain testing device is strong in universality and accurate and convenient in testing. The method can be operated in a small space, is simple and quick to operate, and avoids time consumption and complexity in pasting the strain gauge.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. For embodiments of the method, reference is made to the description of the apparatus embodiments in part. The present invention is not limited to the specific steps and structures described above and shown in the drawings. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
The above description is only an example of the present application and is not limited to the present application. Various modifications and alterations to this application will become apparent to those skilled in the art without departing from the scope of this invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A strain gauge apparatus, comprising: extensometer sensors, reeds, springs and tension rods; one end of the extensometer sensor is provided with an extensometer arm, and the end part of the extensometer arm is provided with a groove; a clasp is arranged at one end of the reed and is used for hooking the reed in the groove during strain testing, a bending plate is connected to the other end of the reed, the pull rod penetrates through the bending plate and is arranged along the length direction of the reed, the spring is sleeved on the pull rod, one end of the spring abuts against the bending plate, the other end of the spring abuts against a pressing plate, and one end, close to the spring, of the pressing plate is connected with the pull rod; the reed can be bent and deformed under the action of external force, and can be restored to the initial state after the external force disappears.
2. The strain gage of claim 1, wherein a pull tab is provided at an end of the tie rod remote from the pressure plate.
3. The strain gage of claim 1, wherein there are two said extensometer arms and said springs, and wherein both said springs are disposed in correspondence with said grooves on said extensometer arms.
4. A strain gage as claimed in claim 3, wherein the two extensometer arms are arranged in parallel.
5. A strain testing device according to claim 3 or 4, characterized in that the bending direction of the clasp is towards the side remote from the pull rod.
6. The strain testing device of claim 1, wherein a locking device is further sleeved on the pull rod, and the locking device is used for fixing the pull rod and the bending plate together.
7. The strain gage of claim 1, wherein said spring is integrally formed with said bent plate.
8. The strain gage of claim 1, wherein the extensometer sensor is coupled to a mechanical testing machine.
9. A method of mounting a strain gage apparatus, for use in mounting a strain gage apparatus as claimed in any one of claims 1 to 8, comprising the steps of:
placing an extensometer arm on one side of a sample to be tested, and placing a reed on the other side of the sample to be tested;
pressing the reed to place the clasp in the groove of the extensometer arm;
loosening the reed, and pulling out the pull rod until the clasp fastens the extensometer arm;
the strain test is started.
10. The method for mounting a strain gauge according to claim 9, wherein the tie bar and the bending plate are locked during the strain gauge.
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| CN202011394986.7A CN112665978B (en) | 2020-12-03 | 2020-12-03 | Strain testing device and mounting method thereof |
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| CN202011394986.7A CN112665978B (en) | 2020-12-03 | 2020-12-03 | Strain testing device and mounting method thereof |
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| US4251918A (en) * | 1979-12-03 | 1981-02-24 | Duggan Michael F | Extensometer |
| JP3060820B2 (en) * | 1994-03-04 | 2000-07-10 | 日本軽金属株式会社 | Extensometer mounting device and extensometer device |
| CN210833480U (en) * | 2019-11-01 | 2020-06-23 | 苏州科联建设工程质量检测有限公司 | Digital display extensometer for bridge detection |
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| CN2740997Y (en) * | 2004-09-09 | 2005-11-16 | 胡景雯 | Electronic ejector with double sides |
| CN201740701U (en) * | 2010-07-23 | 2011-02-09 | 济南试金集团有限公司 | Automatic extensometer |
| CN202994600U (en) * | 2012-12-13 | 2013-06-12 | 武钢集团昆明钢铁股份有限公司 | Extensometer for griping samples of different specifications |
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| CN112665978A (en) | 2021-04-16 |
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