A tool for continuous tensile testing of multiple specimens and its use method

Abstract

The present application relates to a tooling for continuous tensile testing of multiple specimens, including a fixed block and a tensile block, at least one series block is arranged in series between the fixed block and the tensile block, a fixed portion and force transmission rods symmetrically arranged on both sides of the two fixed portions are arranged between the fixed block and the series block, between adjacent series blocks, and between the series block and the tensile block, one end of any force transmission rod away from the tensile block is fixedly connected to the corresponding fixed block and series block, one end of any force transmission rod close to the tensile block is firstly slidingly connected to the corresponding series block and tensile block, and then forms a fixed connection with them after sliding to a certain distance, the relative slip amount of each sliding end of the force transmission rod is different, and when any sample to be tested breaks, the relative slip amount of the force transmission rod in the same horizontal direction as the sample to be tested is set to be greater than zero. It also relates to a method for using the above-mentioned tooling. The present application greatly improves the test efficiency through the tooling and the method for using the tooling.

Description

Technical Field

[0001] The present invention relates to the technical field of tensile testing equipment, in particular to a tool for continuous tensile testing of multiple samples and a use method thereof. Background Art

[0002] Tensile testing is a method used to determine the properties of a material under axial tensile load. The data obtained from a tensile test can be used to determine the material's elastic limit, elongation, elastic modulus, proportional limit, reduction of area, tensile strength, yield point, yield strength, and other tensile properties.

[0003] The slow strain rate test is a rapid method for determining stress corrosion cracking properties. A specimen is slowly and uniformly stretched (while in a test solution) on a constant strain rate machine until it breaks. After the test, the fracture morphology is analyzed using a scanning electron microscope. During the test, a load-elongation curve is measured, from which many parameters reflecting stress corrosion sensitivity can be analyzed. Therefore, each test of a specimen takes a long time, and depending on the test, it can take several weeks or even months to complete a single specimen test.

[0004] In the related art, the specimen fixture is usually fixed at one end by a fixture, and a power device is used to apply tension to the other end for testing. However, for slow strain rate tests, this clamping and fixing method can only measure one specimen in the same time, making the entire measurement cycle lengthy, and there is room for improvement.

[0005] Invention content

[0006] In order to improve test efficiency, the present application provides a tool for continuous tensile testing of multiple specimens.

[0007] The present application provides a tooling for continuous tensile testing of multiple specimens using the following technical solutions:

[0008] A tool for continuous tensile testing of multiple specimens, comprising a fixed block fixedly arranged at a fixed end of a testing machine and a tensile block fixedly arranged at a loading end of the testing machine, at least one series block being arranged in series between the fixed block and the tensile block, a fixed portion for fixing the end of the specimen to be tested and a force transmission rod symmetrically arranged on both sides of the two fixed portions are provided between the fixed block and the series block, between adjacent series blocks, and between the series block and the tensile block, one end of any of the force transmission rods away from the tensile block is fixedly connected to the corresponding fixed block and the series block, one end of any of the force transmission rods close to the tensile block is first slidingly connected to the corresponding series block and the tensile block, and then forms a fixed connection with them after sliding to a certain distance, the sliding direction of any of the sliding ends of the force transmission rod is parallel to the loading direction, and the sliding amount of the sliding end of the force transmission rod is set to a relative sliding amount relative to the series block and the fixed block, the relative sliding amount of each sliding end of the force transmission rod is different, and when any specimen to be tested breaks, the relative sliding amount of the force transmission rod in the same horizontal direction as the specimen to be tested is set to be greater than zero.

[0009] By adopting the above technical solution, the two ends of multiple test samples of different or same materials can be fixed in series in sequence on the fixing parts between the fixed block and the series block, the adjacent series blocks, and the series block and the stretching block, and the relative slip amount of the sliding end of the corresponding horizontal force transmission rod relative to the series block and the fixed block is preset according to the elongation of different test samples. Each relative slip amount is different, and the relative slip amount needs to meet a condition, that is, when any test sample breaks, the relative slip amount of the corresponding force transmission rod is greater than zero. Then the fixed block and the stretching block are installed on the testing machine to carry out the tensile test. During the test, each test sample is initially subjected to the load to realize the load transmission. During this process, as the test sample is gradually stretched, the corresponding force transmission rod is in a sliding state along the loading direction. Only when the test specimen is broken, the corresponding force transmission rod needs to slide a certain distance before the relative slippage is completed, that is, the force transmission rod is changed from a sliding state to a fixed state. At this time, the load on the other test specimens disappears instantly, and then the load is transmitted by the force transmission rod that has been changed to a fixed state, that is, reloading is achieved through the force transmission rod to transfer the load to the other test specimens. And so on. When the test specimen is broken, the corresponding force transmission rod needs to slide a certain distance before the load can continue to be transmitted. The test personnel can directly judge whether the corresponding test specimen is broken by judging whether the relative slippage distance of the force transmission rod is completed. The effect is more intuitive. Moreover, this serial stretching method can realize tensile testing of multiple test specimens at the same time, which greatly shortens the test time.

[0010] Preferably, the stretching block and any series block are provided with a snap-fit ​​sliding groove with a diameter gradually decreasing in the direction pointing to the fixed block, and the sliding end of any force transmission rod is provided with an abutment protrusion, the minimum cross-section of the abutment protrusion is larger than the minimum diameter of the snap-fit ​​sliding groove, and the relative sliding amount of the force transmission rod is preset between the abutment protrusion and the inner wall abutted by the snap-fit ​​sliding groove.

[0011] By adopting the above technical solution, the force transmission rod is composed of two states relative to the tensile block or the series block, the first state is a relative sliding state, and the second state is a relatively fixed state. When in the relative sliding state, the abutting protrusion of the force transmission rod and the card-engaging sliding groove are in sliding connection, that is, the distance between the abutting protrusion and the inner wall of the card-engaging sliding groove is greater than zero. When in the fixed state, the abutting protrusion of the force transmission rod abuts and cooperates with the inner wall of the card-engaging sliding groove. Since the diameter of the guide sliding groove gradually decreases in the direction pointing to the fixed block, it plays a limiting role as the series block and the tensile block continue to move along the loading direction, that is, it specifically realizes the connection mode of the force transmission rod relative to the tensile block and the series block in which it slides first and then is fixed.

[0012] Preferably, the fixed block and any of the series blocks are provided with a snap-fitting groove whose diameter gradually decreases in the direction pointing to the stretching block, and any of the force transmission rods is provided with a snap-fitting protrusion at one end close to the fixed block to form an embedded fit with the snap-fitting groove, and the minimum cross-section of the snap-fitting protrusion is larger than the minimum diameter of the snap-fitting groove.

[0013] By adopting the above technical solution, during actual installation, the stretching block, the series rod, and the sample to be tested are all moved in the direction pointing to the stretching block. The clamping groove and the clamping protrusion with a diameter gradually decreasing in the direction pointing to the stretching block are used to achieve an embedded and fixed fit between the force transmission rod and the clamping groove. This fixing method can be achieved without the aid of other connecting parts.

[0014] Preferably, the series block, fixed block and stretching block each include two clamping blocks that are symmetrical about the loading direction and detachably fixedly connected, and the snap-fit ​​sliding groove and the snap-fit ​​groove are both symmetrically opened on opposite sides of the two clamping blocks.

[0015] By adopting the above technical solution, two clamping blocks are used that are symmetrical about the loading direction and detachably fixedly connected, so that the series block, fixed block and stretching block are all separately detachable and assembled, which facilitates the later replacement and maintenance of the force transmission rod.

[0016] Preferably, the fixed block and the stretching block each further include a connecting block that is detachably fixedly connected to the corresponding two clamping blocks, and opposite sides of the two connecting blocks are both threadedly connected to a connecting rod connected to the testing machine.

[0017] By adopting the above technical solution, the connecting block is used to, on the one hand, ensure the stability of the connection between the two clamping blocks, and on the other hand, facilitate the installation of the connecting rod, and the distance between the fixed block and the stretching block can be adjusted by using the threaded connection of the connecting rod.

[0018] Preferably, a guide groove connected to the snap-on sliding groove is provided on the stretching block and any serial block, and the guide groove is located on the side of the snap-on sliding groove close to the fixed block, the force transmission rod includes a guide sliding section, the snap-on protrusion is arranged at the end of the guide sliding section, and the guide sliding section forms a plug-in sliding fit with the guide groove.

[0019] By adopting the above technical solution and utilizing the plug-in sliding cooperation between the guide groove and the sliding section of the force transmission rod, the sliding stability between the force transmission rod and the tensile block and the series block is greatly improved, which helps to reduce the deviation during the tensile test and improve the test accuracy.

[0020] Preferably, the snap-fit ​​sliding groove and the snap-fit ​​groove on the series block are connected.

[0021] By adopting the above technical solution, the snap-in sliding groove and the snap-in sliding groove on the series block are connected. On the one hand, it is convenient for processing, and on the other hand, the sliding space on the series block is fully utilized. There is no need to trim the snap-in sliding groove according to the relative sliding amount, and only the length of the force transmission rod needs to be changed.

[0022] Preferably, the engaging protrusion is adjustably arranged on the force transmission rod along the loading direction.

[0023] By adopting the above technical solution, the snap-fit ​​protrusion is adjustably set on the force transmission rod along the loading direction, and then the position of the snap-fit ​​protrusion on the force transmission rod can be adjusted according to actual needs, thereby directly adjusting the relative slippage between the force transmission rod and the series block and the stretching block, thereby improving the applicability of the entire device.

[0024] Preferably, the clamping protrusion is connected to the force transmission rod via a thread, and the axis of the threaded connection of the clamping protrusion is parallel to the loading direction, and an anti-slip component is provided between the clamping protrusion and the force transmission rod.

[0025] By adopting the above technical solution and using a threaded connection method, the adjustable setting of the clamping protrusion along the loading direction is achieved. In addition, the anti-dropping piece is used to prevent the clamping protrusion from falling off.

[0026] In order to improve the efficient feedback of test data, the present application also provides a method for using a tool for continuous tensile testing of multiple specimens.

[0027] The present application provides a tooling for continuous tensile testing of multiple specimens using the following technical solutions:

[0028] include

[0029] Step 1: Mark the type and quantity of the sample to be tested, and select the corresponding number of series blocks;

[0030] Step 2: Fix both ends of each sample to be tested on the fixing parts between the fixed block and the series block, between adjacent series blocks, and between the series block and the stretching block, respectively. The number of samples to be tested between the fixed block and the series block, between adjacent series blocks, and between the series block and the stretching block is kept at one.

[0031] Step 3: Two force transmission rods are symmetrically installed on both sides of any test sample, and the relative slip amounts of the corresponding force transmission rods are preset so that their relative slip amounts are different, and after any test sample is broken, the relative slip amount of the force transmission rods in the same horizontal direction as the test sample is greater than zero;

[0032] Step 4: Fix the fixed block and the tensile block on the fixed end and the loading head of the testing machine respectively;

[0033] Step 5: Mark the location of each sample to be tested;

[0034] Step 5: Measure the displacement of the loading head of the testing machine through the displacement measuring unit on the testing machine, and measure the load condition of the loading head through the load measuring unit on the testing machine;

[0035] Step 6: Using the data processing unit, the displacement and loading conditions of the loading head are used to draw a tensile displacement curve reflecting the deformation and loading conditions of each test sample.

[0036] By adopting the above technical solution and using the final tensile displacement curve, the deformation of the test sample after loading can be visually seen, and the actual deformation of each test sample can be directly converted through these two data. In addition, through the difference in each relative slip, it can be directly determined which test sample has broken, and the data of the tensile displacement curve can be matched with it to track and mark the order of fracture, which greatly improves the efficiency of the entire test and also improves the efficiency of processing and analysis of test data.

[0037] In summary, this application includes at least one of the following beneficial technical effects:

[0038] 1. Serial installation of multiple test specimens is achieved by using serial blocks and dowel bars. When any test specimen breaks, the relative slip of the dowel bar in the same horizontal direction as the test specimen is set to be greater than zero. That is, the tester can directly determine whether the corresponding test specimen is broken by judging whether the relative slip distance of the dowel bar has been completed. The effect is more intuitive. In addition, this serial tensile method can realize tensile testing of multiple test specimens at one time, greatly shortening the test time.

[0039] 2. With the help of the separate and detachable installation of the fixed block 1, the series block 3 and the stretching block 2, and the setting of the sliding groove 8 and the sliding abutment between the clamping groove 7 and the corresponding force transmission rod 5, the entire force transmission method is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is an axonometric diagram of the overall structure of the tooling for continuous tensile testing of multiple specimens, which mainly reflects the first embodiment of the present application;

[0041] Figure 2 This is an exploded schematic diagram of a tooling structure for a continuous tensile test of multiple specimens, mainly embodying the first embodiment of the present application;

[0042] Figure 3 This is a schematic diagram of the state of the tooling for continuous tensile testing of multiple samples in the first embodiment of the present application, which mainly shows the initial state A, the fracture state B of the test sample a, the fracture state C of the test sample b, and the fracture state D of the test sample c;

[0043] Figure 4 This is a schematic diagram of a curve showing the displacement and load conditions of the loading head in the first embodiment of the present application;

[0044] Figure 5 This is a schematic diagram mainly showing the structure of the force transmission rod in the second embodiment of the present application.

[0045] Figure numerals: 1, fixed block; 2, stretching block; 3, series block; 4, fixed part; 5, force transmission rod; 51, snap-fit ​​protrusion; 52, abutting protrusion; 53, guide sliding section; 6, clamping block; 7, snap-fit ​​groove; 8, snap-fit ​​sliding groove; 9, guide groove; 10, connecting block; 20, loading rod; 30, anti-slip part. DETAILED DESCRIPTION

[0046] The following is combined with Figure 1-4 This application is described in further detail.

[0047] The embodiments of the present application disclose a tool for continuous tensile testing of multiple specimens.

[0048] Example 1

[0049] Reference Figure 1 and Figure 2The tooling for continuous tensile testing of multiple specimens includes a fixed block 1 fixedly arranged at the fixed end of the testing machine and a tensile block 2 fixedly arranged at the loading end of the testing machine. In the embodiment of the present application, the tooling is applied to a testing machine with the loading end located at the bottom, that is, the fixed block 1 is located above the tensile block 2, and the tensile block 2 will be subjected to a vertical downward tensile load; the fixed block 1 and the tensile block 2 are at least connected in series with one series block 3. In the implementation of the present application, two series blocks 3 are provided, wherein a fixing portion 4 for fixing the end of the sample to be tested and a fixing portion for fixing the end of the sample to be tested are provided between the fixed block 1 and the upper series block 3, between the two series blocks 3, and between the lower series block 3 and the tensile block 2. The force transmission rods 5 are arranged on both sides of the two fixed parts 4. One end of any force transmission rod 5 away from the tensile block 2 is fixedly connected to the fixed block 1 and the two series blocks 3, and the other end is first slidingly connected to the two series blocks 3 and the tensile block 2, and then forms a fixed connection with them after sliding to a certain distance, and the sliding direction of the sliding end of the force transmission rod 5 is parallel to the loading direction, wherein the sliding amount of the sliding end of the force transmission rod 5 is set to the relative sliding amount relative to the fixed block 1 and the two series blocks 3, the relative sliding amount of each sliding end of the force transmission rod 5 is different, and when any sample to be tested is broken, the relative sliding amount of the force transmission rod 5 in the same horizontal direction as the sample to be tested is set to be greater than zero.

[0050] Install the two ends of the test samples of different materials or the same material on the fixing parts 4 between the fixed block 1 and the upper series block 3, between the two series blocks 3, and between the lower series block 3 and the tensile block 2. Then, install the force transmission rods 5 on both sides of the symmetrical sides of the test sample. Then, fix the fixed block 1 to the fixed end of the testing machine and the tensile block 2 to the loading end of the testing machine to complete the installation of the tooling.

[0051] Reference Figure 1 and Figure 2 The fixed block 1, the two series blocks 3 and the tensile block 2 each include two clamping blocks 6 that are symmetrical about the loading direction and detachably fixedly connected, wherein any two clamping blocks 6 are threadedly connected in a direction perpendicular to the loading force by fastening bolts to achieve a detachable fixed connection between the two clamping blocks 6;

[0052] Reference Figure 1 and Figure 2The fixed block 1 and the two series blocks 3 are both provided with a snap-in groove 7 with a diameter gradually decreasing in the direction pointing to the stretching block 2. The snap-in groove 7 can be set as a conical groove with a diameter gradually decreasing in the direction pointing to the stretching block 2, that is, the inner wall of the snap-in groove 7 forms a conical surface as a snap-in surface. The snap-in groove 7 can also be set as a two-stage or multi-stage stepped groove with a diameter gradually decreasing in the direction pointing to the stretching block 2, that is, a stepped surface is formed as a snap-in surface. The corresponding force transmission rod 5 is integrally formed with a snap-in protrusion 51 at one end close to the fixed block 1. The snap-in protrusion 51 is formed with a limiting surface adapted to the snap-in surface, that is, a corresponding conical limiting surface or stepped limiting surface is formed. In the embodiment of the present application, the snap-in surface and the limiting surface both adopt a two-stage stepped surface. Among them, the minimum cross-section of the snap-in protrusion 51 is larger than the minimum diameter of the snap-in groove 7, and the snap-in groove 7 is symmetrically formed on the opposite sides of the two clamping blocks 6 constituting the fixed block 1 and the series block 3.

[0053] Reference Figure 1 and Figure 2 , the two series blocks 3 and the stretching block 2 are provided with a snap-on sliding groove 8 with a diameter gradually decreasing in the direction pointing to the fixed block 1, and an abutting protrusion 52 is provided at one end of any force transmission rod 5 close to the stretching block 2. The snap-on sliding groove 8 is the same as the snap-on groove 7, and can be set as a conical groove and a two-stage or multi-stage stepped groove to form a conical surface or a stepped surface as the abutting surface; correspondingly, a fixing surface adapted to the abutting surface is formed on the abutting protrusion 52, that is, a corresponding conical fixing surface and a stepped fixing surface are formed, wherein the minimum cross-section of the abutting protrusion 52 is larger than the minimum cross-section of the snap-on sliding groove 8 Small diameter, in the embodiment of the present application, the abutting surface and the abutting surface both adopt two-stage stepped surfaces; and the relative sliding amount of the force transmission rod 5 is preset between the fixed surface and the abutting surface of the abutting protrusion 52; the two series blocks 3 and the stretching block 2 are both provided with a guide groove 9 on the side close to the fixed block 1, and the force transmission rod 5 is provided with a guide sliding section 53 on the side close to the stretching block 2, and the guide sliding section 53 forms a plug-in sliding fit with the guide groove 9, thereby improving the stability of the force transmission rod 5 during sliding; wherein, the snap-in sliding groove 8 and the guide groove 9 are both symmetrically formed on the opposite side of the series block 3 and the stretching block 2.

[0054] During actual installation, it is only necessary to embed the end of the force transmission rod 5 close to the fixed block 1 in the half clamping groove 7 of the series block 3 and one of the clamping blocks 6 of the fixed block 1, and then embed the abutment protrusion 52 of the force transmission rod 5 in the half clamping sliding groove 8 of the series block 3 and one of the clamping blocks 6 of the stretching block 2, reserving a relative sliding amount. Finally, use bolts to fix the two clamping blocks 6 of the fixed block 1, the series block 3 and the stretching block 2, so that the clamping protrusion 51 is located in the clamping groove 7, and the limiting surface of the clamping protrusion 51 maintains abutment with the clamping surface of the clamping groove 7 to complete the fixed installation between the force transmission rod 5 and the fixed block 1 and the two series blocks 3, and realize the connection method of first sliding and then fixing between the abutment protrusion 52 and the clamping sliding groove 8.

[0055] Reference Figure 1 and Figure 2 Among them, the snap-fitting sliding grooves 8 and the snap-fitting grooves 7 on the two series blocks 3 are connected and arranged, which, on the one hand, is convenient for processing, and on the other hand, makes full use of the travel space on the series block 3.

[0056] Reference Figure 1 and Figure 2 The fixed block 1 and the stretching block 2 both include a connecting block 10 that is detachably fixedly connected to the corresponding two clamping blocks 6, and the connecting blocks 10 of the fixed block 1 and the stretching block 2 are arranged in opposite directions in the loading direction. Since the structure and connection method of the fixed block 1 and the connecting block 10, and the structure and connection method of the stretching block 2 and the connecting block 10 are the same, the connection method of the fixed block 1 and the connecting block 10 is now explained as an example.

[0057] Reference Figure 1 and Figure 2 The connecting block 10 is fixedly connected to the two clamping blocks 6 of the fixed block 1 by bolts, the connection axis of the bolts is parallel to the loading direction, and the loading rods 20 are threadedly connected to the connecting block 10, and the axis of the threaded connection is parallel to the loading direction. The loading rods 20 on the two connecting blocks 10 are arranged in opposite directions.

[0058] In actual use, the connecting block 10 is used to further fix the two clamping blocks 6 of the fixed block 1 and the stretching block 2. At the same time, the loading rods 20 on the two connecting blocks 10 are used to make the fixed block 1 and the stretching block 2 adjustable relative to the testing machine, thereby improving the applicability of the tooling.

[0059] The implementation principle of a tool for continuous tensile testing of multiple specimens in the embodiment of the present application is as follows:

[0060] During actual installation, the loading rods 20 on the fixed block 1 and the tensile block 2 are fixed to the fixed end and the loading head of the testing machine respectively. Then, the two ends of multiple samples to be tested of different or the same materials are fixed in series in sequence on the fixing parts 4 between the fixed block 1 and the series block 3, the adjacent series blocks 3, and the series block 3 and the tensile block 2. The fixing parts 4 are configured as fixed embedding grooves adapted to the two ends of the fixture of the sample to be tested, and then it is only necessary to embed the two ends of the sample to be tested in the fixed embedding grooves on the fixed block 1, the series block 3, and the tensile block 2; then, the snap-fitting protrusions 51 of the force transmission rod 5 are embedded in the snap-fitting grooves 7 of the fixed block 1 and the series block 3, and the abutting protrusions 52 of the sliding end of the force transmission rod 5 are embedded in the snap-fitting sliding grooves 8, and a certain relative slip amount is preset, and the relative slip amounts of the force transmission rods 5 in different horizontal directions are different;

[0061] Among them, in the fixing method of the test sample and the force transmission rod 5, the test sample and the force transmission rod 5 are first installed in a clamping block 6 of the fixing block 1, the series block 3 and the stretching block 2, and then the two clamping blocks 6 are fixed by bolts to achieve clamping and fixing of both ends of the test sample fixture and both ends of the force transmission rod 5.

[0062] Then, the two connecting blocks 10 are fixed to the opposite sides of the fixed block 1 and the tensile block 2 respectively by bolts. After that, the loading rod 20 above the fixed block 1 is fixed to the fixed end of the testing machine, and the loading rod 20 below the tensile block 2 is fixed to the loading head of the testing machine.

[0063] During the test, each test sample is initially subjected to load to realize load transmission. During this process, as the test sample is gradually stretched, the corresponding force transmission rod 5 is in a sliding state along the loading direction. Only when the test sample is broken, the corresponding force transmission rod 5 needs to slide a certain distance before the relative sliding amount can be completed, that is, the force transmission rod 5 is changed from a sliding state to a fixed state. At this time, the load on the other test samples disappears instantly. Then, the force transmission rod 5 that has been changed to a fixed state is used to transmit the load, that is, re-loading is achieved through the force transmission rod 5 to transfer the load to the other test samples. By analogy, when the test sample is broken, the corresponding force transmission rod 5 needs to slide a certain distance before the load can continue to be transmitted. The test personnel can directly judge whether the corresponding test sample is broken by judging whether the relative sliding distance of the force transmission rod 5 is completed. The effect is more intuitive, and this serial stretching method can realize tensile testing of multiple test samples at the same time, which greatly shortens the test time.

[0064] Example 1 of the present application also discloses a method for using a tool for continuous tensile testing of multiple specimens.

[0065] Step 1: Mark the quantity according to the type of the sample to be tested and select the corresponding number of series blocks 3;

[0066] Step 2: Fix the two ends of each sample to be tested in the fixing portion 4 between the fixing block 1 and the series block 3, between adjacent series blocks 3, and between the series block 3 and the stretching block 2, that is, embed them in the fixing groove. The number of samples to be tested between the fixing block 1 and the series block 3, between adjacent series blocks 3, and between the series block 3 and the stretching block 2 is kept at one.

[0067] Step 3: Two force transmission rods 5 are symmetrically installed on both sides of any test sample, and the relative slip of the corresponding force transmission rods 5 is preset. The relative slip is set to the distance between the fixed surface and the abutting surface of the abutting protrusion 52. The relative slip is generally set to within 50% of the maximum elongation of the test sample, and the relative slip of the force transmission rods 5 in the same horizontal direction is different. In addition, it is required that after any test sample is broken, the relative slip of the force transmission rods 5 in the same horizontal direction as the test sample is greater than zero;

[0068] Step 4: Fix the fixed block 1 and the tensile block 2 to the fixed end and the loading head of the testing machine respectively through the loading rod 20;

[0069] Step 5: Record the location of each sample to be tested and combine it with the mark in step 1 to keep track of it;

[0070] Step 5: Measure the displacement of the loading head of the testing machine through the displacement measuring unit on the testing machine, and measure the load condition of the loading head through the load measuring unit on the testing machine;

[0071] Step 6: Using the data processing unit, the displacement and loading conditions of the loading head are used to draw a tensile displacement curve reflecting the deformation and loading conditions of each sample to be tested.

[0072] In the present application, refer to Figure 3 As shown, the three test samples are marked as a, b, and c in sequence; and are set to the initial state A, the fractured state B of the test sample a, the fractured state C of the test sample b, and the fractured state D of the test sample c, respectively; (wherein, the test sample a is set to fracture before the test sample c, and the test sample c is set to fracture before the test sample b)

[0073] The test process is as follows:

[0074] As the loading head is loading, the two series blocks 3 and the stretching block 2 move downward, and the test samples a, b, and c are all in a stretched state, wherein the corresponding abutting protrusions 52 of the force transmission rods 5 slide relative to the corresponding series blocks 3;

[0075] When stretched to state B, the test sample a breaks. At this time, the relative slip of the force transmission rod 5 in the same horizontal direction as the test sample a is greater than zero. At this time, the load on the loading head disappears instantly. When the relative slip of the force transmission rod 5 is zero, the force transmission rod 5 transmits the force to the series block 3, and the load is regenerated. During this process, the test samples b and c continue to be loaded.

[0076] When stretched to state C, the test sample c breaks. Similarly, the relative slip of the force transmission rod 5 in the same horizontal direction as the test sample c is greater than zero. At this time, the load on the loading head disappears instantly. When the relative slip of the force transmission rod 5 is zero, the force transmission rod 5 transmits the force to the series block 3, and the load is regenerated. During this process, the test sample c continues to be loaded until it is stretched to state D, and the test sample d breaks.

[0077] Reference Figure 4 As shown, using the final tensile displacement curve, the following data can be obtained: a△L, b△L, c△L are the deformation amounts of the test samples a, b, c from the time the load is established to the time the load disappears; aI, bI, cI are the relative slip amounts of the force transmission rod 5 in the same horizontal direction as the test samples a, b, c; a△L, bL and cL are the actual deformation amounts of the test samples a, b, c, respectively.

[0078] The actual deformation of each test sample can be directly converted, and the difference in each relative slip can be used to directly determine which test sample has broken. The data of the tensile displacement curve can be matched with it to track and mark the order of fracture, which greatly improves the efficiency of the entire test and also improves the efficiency of test data processing and analysis.

[0079] Example 2

[0080] Reference Figure 5 The difference between this embodiment and embodiment 1 is that the abutting protrusion 52 on any force transmission rod 5 is adjustably set on the force transmission rod 5 along the loading direction. The adjustable method in the embodiment of the present application adopts a threaded connection and is equipped with a corresponding anti-slip component 30. The anti-slip component 30 can adopt an anti-slip stop ring. Two anti-slip stop rings are provided, and the two anti-slip stop rings are respectively mounted on both sides of the axial direction of the abutting protrusion.

[0081] This enables the adjustable setting of the abutting protrusion along the loading direction, making it easy to adjust the relative sliding amount of each force transmission rod 5 to adapt to the elongation of different samples to be tested.

[0082] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A tool for continuous tensile testing of multiple specimens, characterized by: The invention comprises a fixed block (1) fixedly arranged at the fixed end of the testing machine and a stretching block (2) fixedly arranged at the loading end of the testing machine, wherein at least one series block (3) is arranged in series between the fixed block (1) and the stretching block (2), and a fixing portion (4) for fixing the end of the sample to be tested and force transmission rods (5) symmetrically arranged on both sides of the two fixing portions (4) are arranged between the fixed block (1) and the series block (3), between adjacent series blocks (3), and between the series block (3) and the stretching block (2), wherein any of the force transmission rods (5) is arranged The end of the rod (5) away from the stretching block (2) is fixedly connected to the corresponding fixed block (1) and the series block (3); the end of any of the force transmission rods (5) close to the stretching block (2) is firstly connected by sliding with the corresponding series block (3) and the stretching block (2), and then forms a fixed connection with them after sliding to a certain distance; the sliding direction of the sliding end of any of the force transmission rods (5) is parallel to the loading direction, and the sliding amount of the sliding end of the force transmission rod (5) is set as the relative sliding amount relative to the series block (3) and the fixed block (1); each of the force transmission rods (5) is connected to the corresponding series block (3) and the series block (1) by a sliding connection. The relative slip amounts of the sliding ends of the force transmission rods (5) are all different, and when any of the test samples is broken, the relative slip amount of the force transmission rods (5) in the same horizontal direction as the test sample is set to be greater than zero; the stretching block (2) and any of the series blocks (3) are provided with a snap-fitting sliding groove (8) with a diameter gradually decreasing in a direction pointing toward the fixed block (1); the sliding end of any of the force transmission rods (5) is provided with an abutting protrusion (52), and the minimum cross-section of the abutting protrusion (52) is greater than the minimum cross-section of the snap-fitting sliding groove (8). The force transmission rod (5) has a small diameter, and the relative sliding amount of the force transmission rod (5) is preset between the inner wall abutted by the abutting protrusion (52) and the clamping sliding groove (8); the fixed block (1) and any of the series blocks (3) are provided with a clamping groove (7) with a diameter gradually decreasing in the direction pointing to the stretching block (2); and any of the force transmission rods (5) is provided with a clamping protrusion (51) at one end close to the fixed block (1) and is embedded in the clamping groove (7); the minimum cross-section of the clamping protrusion (51) is larger than the minimum diameter of the clamping groove (7).

2. A tooling for continuous tensile testing of multiple specimens according to claim 1, characterized in that: The series block (3), the fixed block (1) and the stretching block (2) each comprise two clamping blocks (6) which are symmetrical with respect to the loading direction and are detachably fixedly connected, and the snap-fit ​​sliding groove (8) and the snap-fit ​​groove (7) are both symmetrically arranged on opposite sides of the two clamping blocks (6).

3. A tooling for continuous tensile testing of multiple specimens according to claim 2, characterized in that: The fixed block (1) and the stretching block (2) each further include a connecting block (10) which is detachably fixedly connected to the two corresponding clamping blocks (6), and the two connecting blocks (10) are both threadedly connected to a connecting rod connected to the testing machine on opposite sides thereof.

4. A tool for continuous tensile testing of multiple specimens according to claim 3, characterized in that: The stretching block (2) and any of the series blocks (3) are provided with a guide groove (9) which is connected to the snap-fit ​​sliding groove (8), and the guide groove (9) is located on a side of the snap-fit ​​sliding groove (8) close to the fixed block (1). The force transmission rod (5) includes a guide sliding section (53), and the snap-fit ​​protrusion (51) is arranged at an end of the guide sliding section (53). The guide sliding section (53) and the guide groove (9) form a plug-in sliding fit.

5. A tool for continuous tensile testing of multiple specimens according to claim 4, characterized in that: The clamping sliding groove (8) on the series connection block (3) is connected to the clamping groove (7).

6. A tool for continuous tensile testing of multiple specimens according to claim 5, characterized in that: The clamping protrusion (51) is adjustably arranged on the force transmission rod (5) along the loading direction.

7. A tool for continuous tensile testing of multiple specimens according to claim 6, characterized in that: The clamping protrusion (51) is connected to the force transmission rod (5) via a thread, and the axis of the threaded connection of the clamping protrusion (51) is parallel to the loading direction, and an anti-slip component (30) is provided between the clamping protrusion (51) and the force transmission rod (5).

8. A method for using the tooling for continuous tensile testing of multiple specimens according to claim 1, characterized in that: include Step 1: Mark the quantity according to the type of the sample to be tested, and select the corresponding number of series blocks (3); Step 2: fixing the two ends of each sample to be tested on the fixing portion (4) between the fixing block (1) and the series block (3), between adjacent series blocks (3), and between the series block (3) and the stretching block (2), respectively, and the number of samples to be tested between the fixing block (1) and the series block (3), between adjacent series blocks (3), and between the series block (3) and the stretching block (2) is kept at one; Step 3: Two force transmission rods (5) are symmetrically installed on both sides of any test sample, and the relative slip amounts of the corresponding force transmission rods (5) are preset so that their relative slip amounts are different, and after any test sample is broken, the relative slip amount of the force transmission rods (5) in the same horizontal direction as the test sample is greater than zero; Step 4: Fix the fixed block (1) and the tensile block (2) on the fixed end and the loading head of the testing machine respectively; Step 5: Record the location of each sample to be tested; Step 5: Measure the displacement of the loading head of the testing machine through the displacement measuring unit on the testing machine, and measure the load condition of the loading head through the load measuring unit on the testing machine; Step 6: Use the data processing unit to draw a tensile displacement curve reflecting the deformation and loading conditions of each sample to be tested through the displacement and loading conditions of the loading head.

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