CN112213194A - Material elongation testing system and method - Google Patents
Material elongation testing system and method Download PDFInfo
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- 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
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
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- G01N2203/0017—Tensile
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
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Abstract
The invention relates to the technical field of material elongation test, in particular to a material elongation test system which comprises a stretching device, two image collectors for collecting images of two gauge length lines of a tested sample, a driving device for driving the two image collectors to move in a reverse direction along the stretching direction of the tested sample and a controller, wherein the controller controls the driving device to drive the two image collectors to respectively move synchronously along with the two gauge length lines on the tested sample. The method mainly comprises the steps that two image collectors are respectively positioned at positions corresponding to two gauge length lines of a tested sample, the controller controls the driving device to drive the two image collectors to respectively synchronously move along with the two gauge length lines of the tested sample while the stretching device stretches the tested sample, the image collectors stop moving when the tested sample is broken, and the elongation of the tested sample is obtained through the displacement of the two image collectors and the elongation is calculated. Can meet the elongation test requirement of the material with large elongation.
Description
Technical Field
The invention relates to the technical field of material elongation testing, in particular to a material elongation testing system and a material elongation testing method.
Background
Elongation testing of materials typically uses an extensometer or ruler to record the elongation of the sample being tested. Macromolecular material has that extension length is big, the big characteristics of percentage elongation, to macromolecular material's percentage elongation test, generally adopts artifical handheld extension chi to carry out artifical reading or adopts the mechanical extensometer of centre gripping on being tested the appearance. The manual handheld extension ruler completely depends on manual operation in measurement, and the accuracy of a test result cannot be guaranteed. Mechanical extensometer measurement is an image-based extensometer testing method, and a camera is adopted to shoot a gauge length line of a tested sample for calculation.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a material elongation testing system and a material elongation testing method, which can meet the elongation testing requirement of a material with large elongation, and have the advantages of small equipment space requirement and convenient operation, so as to overcome the defects in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
a material elongation testing system comprising: the stretching device is used for clamping and stretching a sample to be tested, and a first gauge length line and a second gauge length line which are spaced are marked on the sample to be tested; the first image collector is used for collecting an image of a first gauge length line on a sample to be tested; the second image collector is used for collecting the image of a second gauge length line on the sample to be tested; the driving device is used for driving the first image collector and the second image collector to reversely move along the stretching direction of the tested sample; the controller, the stretching device, the first image collector, the second image collector and the driving device are all connected with the controller, and the controller controls the driving device to drive the first image collector and the second image collector to respectively move synchronously along with the first scale distance line and the second scale distance line on the sample to be tested.
Preferably, the first image collector and the second image collector are respectively arranged on the first support and the second support, the first support and the second support are both connected with the driving device, and the driving device drives the first support and the second support to reversely move along the stretching direction of the tested sample.
Preferably, the test device further comprises a support rod arranged in parallel with the stretching direction of the sample to be tested, and the first support and the second support are slidably sleeved on the support rod.
Preferably, the driving device comprises a first driving mechanism for driving the first support to move and a second driving mechanism for driving the second support to move, and the first driving mechanism and the second driving mechanism are both connected with the controller.
Preferably, the first driving mechanism comprises a first screw rod arranged in parallel with the stretching direction of the sample to be tested and a first driving piece for driving the first screw rod to rotate, the first support is in threaded connection with the first screw rod, and the first driving piece is connected with the controller.
Preferably, the second driving mechanism comprises a second screw rod arranged in parallel with the stretching direction of the sample to be tested and a second driving piece for driving the second screw rod to rotate, the second support is in threaded connection with the second screw rod, and the second driving piece is connected with the controller.
Preferably, the first image collector and/or the second image collector are cameras.
A method for testing elongation of a material sequentially comprises the following steps: clamping a sample to be tested marked with a first gauge length line and a second gauge length line which are spaced on a stretching device; secondly, respectively positioning a first image collector and a second image collector at positions corresponding to a first gauge length line and a second gauge length line on the sample to be tested; starting a stretching device to stretch the tested sample, controlling a driving device to drive a first image collector and a second image collector to synchronously move along with a first scale distance line and a second scale distance line on the tested sample by a controller, and controlling the driving device to stop driving the first image collector and the second image collector to move by the controller when the tested sample is broken; and fourthly, obtaining the elongation of the tested sample according to the displacement of the first image collector and the second image collector driven by the driving device, and calculating the elongation.
Compared with the prior art, the invention has the remarkable progress that:
the method adopts two follow-up image collectors (a first image collector and a second image collector), in the process of carrying out a tensile test on a tested sample by a tensile device, a controller controls a driving device to drive the two image collectors to respectively synchronously move along a first gauge length line and a second gauge length line on the tested sample, so that the two image collectors can keep corresponding positions with the first gauge length line and the second gauge length line on the tested sample and respectively carry out real-time acquisition on images of the two image collectors, therefore, the method can adapt to the elongation test requirements of large elongation materials such as high polymer materials and the like, can not be limited by the limitation of the optical field of the image collectors, and also can not meet the elongation test requirements of the large elongation materials by adopting the image collectors with large object distance, and has the advantages of small equipment space requirement and convenience in operation.
Drawings
Fig. 1 is a schematic structural diagram of a material elongation testing system according to an embodiment of the present invention.
Wherein the reference numerals are as follows:
1. first image collector 2 and second image collector
3. Controller 4, sample under test
4a, a first scale distance line 4b and a second scale distance line
51. Sample upper clamp 52 and sample lower clamp
61. First transmission line 62, second transmission line
63. Third transmission line 64 and fourth transmission line
7. First support 8, second support
9. Support rod 10 and first screw rod
11. Second screw 12, screw base
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to limit the present invention.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the system or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1, an embodiment of the present invention provides a material elongation testing system. The material elongation testing system of the embodiment comprises a stretching device, a first image collector 1, a second image collector 2, a driving device and a controller 3.
The stretching device is used for clamping and stretching the tested sample 4 to realize the stretching test of the tested sample 4, the first scale distance line 4a and the second scale distance line 4b which are spaced are marked on the tested sample 4, and the extending amount of the tested sample 4 is represented by the variation of the distance between the first scale distance line 4a and the second scale distance line 4b before and after the tested sample 4 is stretched, so that the extending rate of the tested sample 4 can be calculated. In this embodiment, the form of the stretching device is not limited, and a stretching device capable of implementing a stretching test in the prior art may be adopted, and conventionally, the stretching device has an upper sample clamp 51 and a lower sample clamp 52, the upper sample clamp 51 is located above the lower sample clamp 52, and the upper sample clamp 51 and the lower sample clamp 52 clamp the upper end and the lower end of the sample 4 to be tested, respectively, so that the sample 4 to be tested is vertically clamped and fixed between the upper sample clamp 51 and the lower sample clamp 52. The stretching device is connected with the controller 3 through the first transmission line 61, so that the stretching device can transmit test data (such as a stretching force value) in the stretching test process to the controller 3 in real time, and the controller 3 receives the test data to realize the acquisition of the stretching test data.
The first image collector 1 is used for collecting images of a first gauge length line 4a on the sample 4 to be tested. The first image collector 1 is connected with the controller 3 through the second transmission line 62, so that the first image collector 1 can transmit the collected image of the first gauge length line 4a on the sample 4 to be tested to the controller 3 in real time, and the controller 3 receives the image information to realize the collection and display of the image of the first gauge length line 4a on the sample 4 to be tested. Preferably, the first image collector 1 may adopt a camera. During operation, the first image collector 1 is positioned at a position corresponding to the first gauge length line 4a on the sample 4 to be tested, so that the optical focus of the first image collector 1 and the first gauge length line 4a on the sample 4 to be tested are located on the same horizontal line, and the first image collector 1 can accurately collect the image of the first gauge length line 4a on the sample 4 to be tested.
The second image collector 2 is used for collecting images of a second gauge length line 4b on the sample 4 to be tested. The second image collector 2 is connected with the controller 3 through a third transmission line 63, so that the second image collector 2 can transmit the collected image of the second gauge length line 4b on the tested sample 4 to the controller 3 in real time, and the controller 3 receives the image information to realize the collection and display of the image of the second gauge length line 4b on the tested sample 4. Preferably, the second image collector 2 can adopt a camera. During operation, the second image collector 2 is positioned at a position corresponding to the second gauge length line 4b on the sample 4 to be tested, so that the optical focus of the second image collector 2 and the second gauge length line 4b on the sample 4 to be tested are positioned on the same horizontal line, and the second image collector 2 can accurately collect the image of the second gauge length line 4b on the sample 4 to be tested.
The driving device is used for driving the first image collector 1 and the second image collector 2 to move reversely along the stretching direction of the tested sample 4, so that when the stretching device stretches the tested sample 4, the first image collector 1 and the second image collector 2 can respectively move along the first scale distance line 4a and the second scale distance line 4b on the tested sample 4, and therefore the first image collector 1 and the second image collector 2 can respectively keep corresponding positions with the first scale distance line 4a and the second scale distance line 4b on the tested sample 4 to collect images of the first image collector 1 and the second image collector in real time in the stretching test process. The stretching direction of the sample 4 to be tested means a direction in which the sample 4 to be tested is stretched by a tensile force of the stretching means during the stretching test. The driving device is connected with the controller 3 through a fourth transmission line 64, the controller 3 controls the driving device to start or stop working, and controls the speed at which the driving device drives the first image collector 1 and the second image collector 2 to move, so as to realize automatic control of the moving process of the first image collector 1 and the second image collector 2, ensure that the first image collector 1 and the second image collector 2 respectively move synchronously with the first gauge length line 4a and the second gauge length line 4b on the sample 4 to be tested, simultaneously, the working data of the driving device driving the first image collector 1 and the second image collector 2 to move is also transmitted to the controller 3, and the controller 3 receives the working data, so as to realize acquisition of the displacement of the driving device driving the first image collector 1 and the second image collector 2 to move. Because the first image collector 1 and the second image collector 2 respectively move synchronously along with the first scale distance line 4a and the second scale distance line 4b on the tested sample 4, the sum of the displacement amounts of the first image collector 1 and the second image collector 2 before and after the tested sample 4 is stretched is the variation amount of the distance between the first scale distance line 4a and the second scale distance line 4b on the tested sample 4, namely the extension amount of the tested sample 4, therefore, the controller 3 can realize the acquisition of the extension amount of the tested sample 4 in the stretching test process by acquiring the displacement amounts of the first image collector 1 and the second image collector 2 driven by the driving device, thereby calculating the extension rate of the tested sample 4.
The material elongation testing system of the embodiment adopts two follow-up image collectors (a first image collector 1 and a second image collector 2), and in the process of performing the tensile test on the tested sample 4 by the tensile device, the controller 3 controls the driving device to drive the two image collectors to respectively synchronously move along with the first gauge length line 4a and the second gauge length line 4b on the tested sample 4, so that the two image collectors can keep corresponding positions with the first gauge length line 4a and the second gauge length line 4b on the tested sample 4 to respectively collect images of the two image collectors in real time, thereby being capable of adapting to the elongation testing requirements of large elongation materials such as high polymer materials, being not limited by the limitation of the optical field of the image collectors, and not needing to meet the elongation testing requirements of the large elongation materials by adopting the image collectors with large object distances, has the advantages of small equipment space requirement and convenient operation.
In this embodiment, the form of the controller 3 is not limited, and a controller in the prior art, such as a PLC controller or a single chip microcomputer, may be used. In order to enable the operator to visually read the test data collected by the controller 3, the controller 3 is preferably connected to a display screen for displaying the test data.
In this embodiment, preferably, the first image collector 1 and the second image collector 2 are respectively disposed on the first bracket 7 and the second bracket 8, and the first bracket 7 and the second bracket 8 are both horizontally disposed and are used for respectively supporting the first image collector 1 and the second image collector 2. The first support 7 and the second support 8 are connected with a driving device, the driving device drives the first support 7 and the second support 8 to move in the opposite direction along the stretching direction of the sample 4 to be tested, and the first support 7 and the second support 8 respectively drive the first image collector 1 and the second image collector 2 to move.
Preferably, the material elongation testing system of the embodiment further includes a supporting rod 9, the supporting rod 9 is parallel to the stretching direction of the tested sample 4 and is located at one side of the tested sample 4, and the first bracket 7 and the second bracket 8 are slidably sleeved on the supporting rod 9. The supporting rod 9 plays a role in supporting and guiding the first support 7 and the second support 8, and the first support 7 and the second support 8 can be guaranteed to stably move in the stretching direction of the tested sample 4 under the driving of the driving device, so that the moving stability of the first image collector 1 and the second image collector 2 is guaranteed.
In this embodiment, the driving device preferably includes a first driving mechanism for driving the first support 7 to move and a second driving mechanism for driving the second support 8 to move, and both the first driving mechanism and the second driving mechanism are connected to the controller 3 through a fourth transmission line 64. The controller 3 controls the first driving mechanism and the second driving mechanism to respectively drive the first support 7 and the second support 8 to move, so that the displacement of the first image collector 1 and the displacement of the second image collector 2 can be accurately collected.
Preferably, the first driving mechanism includes a first screw 10 and a first driving member (not shown in the drawings). The first screw 10 is disposed in parallel with the stretching direction of the sample 4 to be tested, and therefore, the first screw 10 is parallel with the supporting bar 9. The first driving member is connected to the first screw 10, and the first driving member drives the first screw 10 to rotate. The first support 7 is in threaded connection with the first screw 10, an external thread is arranged on the outer peripheral surface of the first screw 10, the first support 7 is provided with a first threaded through hole with an internal thread, and the internal thread of the first threaded through hole is in matched connection with the external thread of the first screw 10. When the first driving piece drives the first screw rod 10 to rotate, the first support 7 can be displaced along the first screw rod 10 through thread matching, and the displacement speed of the first support 7 can be controlled by controlling the rotating speed of the first screw rod 10, so that the moving speed of the first image collector 1 is controlled; the displacement direction of the first bracket 7 can be changed by changing the rotational direction of the first screw 10. The first driving member is connected with the controller 3, and the controller 3 controls and adjusts the rotating speed and the rotating direction of the first driving member to drive the first screw 10 to rotate. The form of the first driving member is not limited, and any power member capable of driving the first screw 10 to rotate, such as an electric motor, may be used.
Preferably, the second driving mechanism includes a second screw 11 and a second driving member (not shown in the drawings). The second screw 11 is disposed in parallel with the stretching direction of the sample 4 to be tested, and therefore, the second screw 11 is in parallel with the supporting bar 9. The second driving member is connected to the second screw 11, and the second driving member drives the second screw 11 to rotate. The second support 8 is in threaded connection with the second screw rod 11, an external thread is arranged on the outer peripheral surface of the second screw rod 11, the second support 8 is provided with a second threaded through hole with an internal thread, and the internal thread of the second threaded through hole is in matched connection with the external thread of the second screw rod 11. When the second driving piece drives the second screw rod 11 to rotate, the second support 8 can be displaced along the second screw rod 11 through thread matching, and the displacement speed of the second support 8 can be controlled by controlling the rotating speed of the second screw rod 11, so that the moving speed of the second image collector 2 is controlled; the displacement direction of the second bracket 8 can be changed by changing the rotational direction of the second screw 11. The second driving member is connected with the controller 3, and the controller 3 controls and adjusts the rotating speed and the rotating direction of the second driving member to drive the second screw rod 11 to rotate. The form of the second driving member is not limited, and any power member capable of driving the second screw 11 to rotate, such as an electric motor, may be used.
In this embodiment, the first screw 10 and the second screw 11 are both rotatably supported on the screw base 12, and the first driving member and the second driving member are both accommodated in the screw base 12.
The working principle of the material elongation testing system of the embodiment is as follows: marking a first gauge length line 4a and a second gauge length line 4b which are spaced on the sample 4 to be tested, respectively clamping the upper end and the lower end of the sample 4 to be tested by an upper sample clamp 51 and a lower sample clamp 52 of a stretching device, and vertically clamping and fixing the sample 4 to be tested on the stretching device; then, the controller 3 controls the first driving part and the second driving part to start and respectively drive the first screw 10 and the second screw 11 to rotate according to the image information collected by the first image collector 1 and the second image collector 2, so that the first bracket 7 and the second bracket 8 respectively drive the first image collector 1 and the second image collector 2 to move until the first image collector 1 and the second image collector 2 respectively reach the positions corresponding to the first gauge length line 4a and the second gauge length line 4b on the tested sample 4, the controller 3 controls the first driving part and the second driving part to stop working, the corresponding positions can be obtained by judging the image information acquired by the first image acquirer 1 and the second image acquirer 2, and at the moment, the optical focuses of the first image acquirer 1 and the second image acquirer 2 are respectively positioned on the same horizontal line with the first scale distance line 4a and the second scale distance line 4b on the sample 4 to be tested; then, the stretching device is started to stretch the sample 4 to be tested, at the same time, the controller 3 controls the first driving part and the second driving part to be started, and the controller 3 controls the first driving part and the second driving part to respectively drive the rotating speed and the rotating direction of the first screw rod 10 and the second screw rod 11 to rotate according to the image information collected by the first image collector 1 and the second image collector 2, so that the first bracket 7 and the second bracket 8 respectively drive the first image collector 1 and the second image collector 2 to synchronously move along with the first gauge length line 4a and the second gauge length line 4b on the sample 4 to be tested, in the process, the optical focuses of the first image collector 1 and the second image collector 2 are respectively kept on the same horizontal line with the first gauge length line 4a and the second gauge length line 4b on the sample 4 to be tested, the working data of the first driving part and the second driving part are transmitted to the controller 3 in real time, the test data in the process of the tensile test of the tensile device are transmitted to the controller 3 in real time, when the test data information received by the controller 3 shows that the tested sample 4 is broken, the controller 3 controls the first driving piece and the second driving piece to stop working, and the first image collector 1 and the second image collector 2 stop moving; finally, the controller 3 obtains the displacement of the first image collector 1 and the second image collector 2 according to the received working data of the first driving piece and the second driving piece and calculates the extension of the tested sample 4, so that the extension of the tested sample 4 can be calculated, and meanwhile, the controller 3 can obtain the test result of the relevant parameters of the tensile test according to the received test data of the tensile test process of the tensile device and form a data report. Therefore, the material elongation testing system can realize full-automatic acquisition of test data, reduce errors caused by artificial acquisition and improve the testing precision.
The embodiment of the invention also provides a material elongation testing method. The method for testing elongation percentage of material in this embodiment can be implemented by using the apparatus for testing elongation percentage of material in this embodiment. Referring to fig. 1, the method for testing elongation of material of the present embodiment sequentially includes the following steps.
Firstly, clamping a sample to be tested 4 marked with a first gauge length line 4a and a second gauge length line 4b which are spaced on a stretching device. Specifically, the upper and lower ends of the sample 4 are held by the upper and lower sample grips 51 and 52 of the stretching device, respectively, and the sample 4 is held and fixed vertically between the upper and lower sample grips 51 and 52 of the stretching device. The stretching device can adopt a stretching device which can realize a stretching test in the prior art.
And step two, respectively positioning the first image collector 1 and the second image collector 2 at positions corresponding to the first scale distance line 4a and the second scale distance line 4b on the sample 4 to be tested. Specifically, the first image collector 1 and the second image collector 2 are respectively used for collecting images of a first gauge length line 4a and a second gauge length line 4b on the sample 4 to be tested, and a driving device is provided for driving the first image collector 1 and the second image collector 2 to move along the stretching direction of the sample 4 to be tested. The controller 3 controls the driving device to start and drive the first image collector 1 and the second image collector 2 to move respectively according to the image information collected by the first image collector 1 and the second image collector 2, the controller 3 controls the driving device to stop working when the first image collector 1 and the second image collector 2 reach the positions corresponding to the first scale distance line 4a and the second scale distance line 4b on the tested sample 4 respectively, the corresponding positions can be obtained by judging the image information collected by the first image collector 1 and the second image collector 2, and at the moment, the optical focuses of the first image collector 1 and the second image collector 2 are located on the same horizontal line with the first scale distance line 4a and the second scale distance line 4b on the tested sample 4 respectively. The first image collector 1 and the second image collector 2 can both adopt cameras. The driving device may adopt a structure of the driving device as in the above-described material elongation testing device of the present embodiment.
Step three, the stretching device is started to stretch the tested sample 4, meanwhile, the controller 3 controls the driving device to start, and the controller 3 controls the driving device to drive the first image collector 1 and the second image collector 2 to respectively move synchronously along with the first scale distance line 4a and the second scale distance line 4b on the tested sample 4 according to the image information collected by the first image collector 1 and the second image collector 2, in the process, the optical focuses of the first image collector 1 and the second image collector 2 are respectively kept on the same horizontal line with the first scale distance line 4a and the second scale distance line 4b on the tested sample 4, the working data of the driving device is transmitted to the controller 3 in real time, the test data in the stretching test process of the stretching device is transmitted to the controller 3 in real time, when the test data information received by the controller 3 shows that the tested sample 4 is broken, the controller 3 controls the driving device to stop working, and the first image collector 1 and the second image collector 2 stop moving.
And step four, because the first image collector 1 and the second image collector 2 respectively move synchronously along with the first scale distance line 4a and the second scale distance line 4b on the sample 4 to be tested, the sum of the displacement amounts of the first image collector 1 and the second image collector 2 before and after the sample 4 to be tested is stretched is the variation amount of the distance between the first scale distance line 4a and the second scale distance line 4b on the sample 4 to be tested, namely the extension amount of the sample 4 to be tested. Therefore, the controller 3 obtains displacement of the driving device for driving the first image collector 1 and the second image collector 2 to move according to the received working data of the driving device and calculates the extension amount of the tested sample 4, so that the extension rate of the tested sample 4 can be calculated, and meanwhile, the controller 3 can obtain a test result of the relevant parameters of the tensile test according to the received test data of the tensile test process of the tensile device and form a data report.
Therefore, in the material elongation testing method of the embodiment, two follow-up image collectors (a first image collector 1 and a second image collector 2) are adopted, and in the process of performing the tensile test on the tested sample 4 by the tensile device, the controller 3 controls the driving device to drive the two image collectors to respectively synchronously move along with the first gauge length line 4a and the second gauge length line 4b on the tested sample 4, so that the two image collectors can keep corresponding positions with the first gauge length line 4a and the second gauge length line 4b on the tested sample 4 to respectively collect images of the two image collectors in real time, thereby being capable of adapting to the elongation testing requirements of large elongation materials such as high molecular materials and the like, being not limited by the limitation of the optical field of the image collectors, and not needing to meet the elongation testing requirements of the large elongation materials by adopting the image collectors with large object distances, the method for testing the elongation percentage of the material has the advantages of being small in equipment space requirement and convenient to operate, and the method for testing the elongation percentage of the material can achieve full-automatic collection of test data, reduce errors caused by manual collection and improve test precision.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (8)
1. A material elongation testing system, comprising:
the stretching device is used for clamping and stretching a tested sample (4), and a first gauge length line (4a) and a second gauge length line (4b) which are spaced are marked on the tested sample (4);
the first image collector (1) is used for collecting an image of a first gauge length line (4a) on the tested sample (4);
the second image collector (2) is used for collecting an image of a second gauge length line (4b) on the tested sample (4);
the driving device is used for driving the first image collector (1) and the second image collector (2) to reversely move along the stretching direction of the tested sample (4);
the stretching device, the first image collector (1), the second image collector (2) and the driving device are connected with the controller (3), the controller (3) controls the driving device to drive the first image collector (1) and the second image collector (2) to move synchronously along with a first scale distance line (4a) and a second scale distance line (4b) on the tested sample (4) respectively.
2. The material elongation testing system according to claim 1, wherein the first image collector (1) and the second image collector (2) are respectively arranged on a first bracket (7) and a second bracket (8), the first bracket (7) and the second bracket (8) are both connected with the driving device, and the driving device drives the first bracket (7) and the second bracket (8) to move reversely along the stretching direction of the sample under test (4).
3. The material elongation testing system according to claim 2, further comprising a support bar (9) arranged parallel to the stretching direction of the tested sample (4), wherein the first bracket (7) and the second bracket (8) are slidably sleeved on the support bar (9).
4. The material elongation testing system according to claim 2, wherein the driving device comprises a first driving mechanism for driving the first support (7) to move and a second driving mechanism for driving the second support (8) to move, and the first driving mechanism and the second driving mechanism are both connected with the controller (3).
5. The material elongation testing system according to claim 4, wherein the first driving mechanism comprises a first screw (10) arranged parallel to the stretching direction of the test specimen (4) to be tested and a first driving member for driving the first screw (10) to rotate, the first bracket (7) is in threaded connection with the first screw (10), and the first driving member is connected with the controller (3).
6. The material elongation testing system according to claim 4, wherein the second driving mechanism comprises a second screw (11) arranged parallel to the stretching direction of the tested sample (4) and a second driving member for driving the second screw (11) to rotate, the second bracket (8) is in threaded connection with the second screw (11), and the second driving member is connected with the controller (3).
7. The material elongation testing system according to claim 1, wherein the first image collector (1) and/or the second image collector (2) is a camera.
8. A method for testing elongation percentage of a material is characterized by sequentially comprising the following steps:
clamping a tested sample (4) marked with a first gauge length line (4a) and a second gauge length line (4b) which are spaced on a stretching device;
secondly, respectively positioning a first image collector (1) and a second image collector (2) at positions corresponding to a first gauge length line (4a) and a second gauge length line (4b) on the sample to be tested (4);
thirdly, starting a stretching device to stretch the tested sample (4), controlling a driving device to drive a first image collector (1) and a second image collector (2) to synchronously move along with a first scale distance line (4a) and a second scale distance line (4b) on the tested sample (4) by a controller (3), and controlling the driving device to stop driving the first image collector (1) and the second image collector (2) to move by the controller (3) when the tested sample (4) is broken;
and fourthly, obtaining the extension amount of the tested sample (4) according to the displacement of the first image collector (1) and the second image collector (2) driven by the driving device, and calculating the extension rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011217705.0A CN112213194A (en) | 2020-11-04 | 2020-11-04 | Material elongation testing system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011217705.0A CN112213194A (en) | 2020-11-04 | 2020-11-04 | Material elongation testing system and method |
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| Publication Number | Publication Date |
|---|---|
| CN112213194A true CN112213194A (en) | 2021-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011217705.0A Pending CN112213194A (en) | 2020-11-04 | 2020-11-04 | Material elongation testing system and method |
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| Country | Link |
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| CN (1) | CN112213194A (en) |
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2020
- 2020-11-04 CN CN202011217705.0A patent/CN112213194A/en active Pending
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