Special tool for tensile test of T-shaped sample

Abstract

The invention discloses a T-shaped sample tensile test special tool, and relates to the technical field of material mechanical property testing, the T-shaped sample tensile test special tool comprises a support, two T-shaped pressing blocks connected with the support through bolts, a baffle connected with the support through bolts, a chuck connected with the support through the baffle, and a bearing bolt; a cross-shaped groove used for installing the T-shaped sample and the chuck is formed in the connecting position of the support and the T-shaped pressing block, the vertical portion of the T-shaped sample penetrates through the upper end of the cross-shaped groove, and the chuck is installed at the lower end of the cross-shaped groove. Furthermore, the upper end and the lower end of the cross-shaped groove are in an opening shape, the upper end of the cross-shaped groove is a V-shaped opening, and the width of the V-shaped opening is gradually reduced from the interior of the cross-shaped groove to the exterior of the cross-shaped groove. According to the invention, stable clamping and precise positioning of the T-shaped sample can be realized, and uniform stress of the sample in the stretching process is ensured, so that the precision and reliability of a tensile test are improved.

Description

Technical Field

[0001] The invention relates to the technical field of material mechanical property testing, and in particular to a special tooling for a T-type specimen tensile test. Background Art

[0002] In the mechanical property testing of materials, tensile testing is a commonly used evaluation method, especially for T-type specimens. The traditional clamping method often leads to inaccurate specimen positioning or uneven force, which in turn affects the accuracy and reliability of the test data. Existing T-type specimens are often rod-shaped or plate-shaped. The following problems may occur when the tensile test fixture is clamped:

[0003] 1. When different specimens are used for testing, the fixture may be difficult to adapt due to differences in shape, size and material of the T-type specimens. This may not only make it difficult for the tooling to accurately clamp or stably fix the specimens, but may also increase the complexity and time of installation. The specimens may even deform or loosen during the test due to uneven or inappropriate clamping force, thereby affecting the accuracy and repeatability of the test results. In the tensile test, the T-piece may be misaligned due to unstable positioning, resulting in inaccurate tensile data.

[0004] 2. In the tensile test, if the applied tensile force is too large, it may exceed the yield strength or load limit of the tooling material, causing plastic deformation, cracking or breakage of the tooling, and may even cause the connection parts to loosen or fall off, making it impossible to stably clamp the specimen, affecting the accuracy and reliability of the test. Long-term exposure to excessive tensile force may cause fatigue damage to the tooling, reduce its service life and increase safety hazards.

[0005] 3. In the tensile test of T-pieces, it is often necessary to punch holes in the clamping part of the T-piece and fix it with bolts to ensure that the specimen can be stably clamped during the test. However, this practice may reduce the stiffness of the T-piece because punching will weaken the continuity and integrity of the material at the clamping part, causing local stress concentration, increasing the possibility of deformation, and even affecting the tensile properties of the specimen and the accuracy of the test results. In addition, improper design of the hole position and size may aggravate material fatigue and further reduce the bearing capacity and rigidity of the specimen, especially in a high-load tensile environment, where this effect may become more significant.

[0006] The above problems may lead to instability in the stretching process, making it difficult to meet the requirements of high-precision testing. Therefore, the present invention proposes a special tooling for a T-type specimen tensile test. Summary of the invention

[0007] The purpose of the present invention is to solve the defects in the prior art and to propose a special tooling for T-type specimen tensile test.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A special tool for a T-type specimen tensile test, comprising a bracket, and further comprising: two T-type pressure blocks connected to the bracket by bolts, a baffle connected to the bracket by bolts, a chuck connected to the bracket by the baffle, and a load-bearing bolt;

[0010] A cross groove for installing a T-shaped specimen and a chuck is provided at the connection between the bracket and the T-shaped pressing block. The vertical portion of the T-shaped specimen passes through the upper end of the cross groove, and the chuck is installed at the lower end of the cross groove.

[0011] Furthermore, the upper and lower ends of the cross groove are open, the upper end of the cross groove is a V-shaped opening, the width of the V-shaped opening gradually decreases from the inside to the outside of the cross groove, and the lower end of the cross groove is a T-shaped opening, and the upper part of the T-shaped opening is opened into a groove by a milling cutter process.

[0012] Furthermore, four corners at the left and right ends of the cross groove are each provided with a cylindrical force-releasing hole that penetrates the bracket and is perpendicular to the bracket.

[0013] Furthermore, a through cylindrical hole perpendicular to the bracket is symmetrically provided on both sides of the upper and lower ends of the cross groove, and a load-bearing bolt is installed.

[0014] Furthermore, the T-shaped test specimen is positioned front and rear on the bracket by two T-shaped pressing blocks, and the two T-shaped pressing blocks are fastened by bolts.

[0015] Furthermore, the clamp is divided into a clamp lower layer and a clamp upper layer at the connection between the clamp and the bracket, and the length of the clamp upper layer is less than the distance between the two load-bearing bolts.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention can adapt to T-shaped specimens of different shapes, especially welded parts, by setting a V-shaped opening at the upper end of the cross groove. Since welded parts may have welding features at the clamping part and the connection between the vertical parts, traditional designs may not be able to accommodate such specimens smoothly, but the V-shaped opening can effectively solve this problem, so that welded parts can be smoothly placed and fixed, avoiding the adaptation problem caused by welding features, thereby improving the accuracy and reliability of the test process.

[0018] 2. The present invention can determine the position of the entire tooling by using a chuck for support, and can also realize the stretching function.

[0019] 3. The present invention can effectively resist deformation, enhance the stability of the tooling, and significantly improve its service life by installing two force-bearing bolts in the through circular holes on both sides of the cross groove.

[0020] 4. The present invention can effectively realize stress unloading and interference relief by arranging process-through circular holes at the left and right ends of the cross groove, reduce deformation caused by uneven force or interference, and thus improve the accuracy and stability of the tooling.

[0021] 5. The present invention can effectively avoid the forward and backward movement and abnormal deformation of the T-shaped specimen in the tensile test by installing T-shaped pressure blocks on both sides.

[0022] 6. The present invention ensures that the chuck maintains a stable position during the T-type specimen tensile test by using a baffle chuck, avoiding displacement caused by force or improper operation, thereby improving the positioning accuracy and operational reliability of the tooling.

[0023] In summary, the present invention can achieve stable clamping and precise positioning of the T-shaped specimen, and ensure that the specimen is uniformly stressed during the stretching process, thereby improving the accuracy and reliability of the tensile test. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the structure of the bracket in the present invention;

[0027] Figure 3 A half-section view of the bracket of the present invention;

[0028] Figure 4 It is a structural schematic diagram of the chuck in the present invention;

[0029] Figure 5 It is a schematic diagram of the T-type pressing block structure in the present invention.

[0030] In the figure: 1 bracket, 2 T-shaped pressure block, 3 baffle, 4 chuck, 5 load-bearing bolt, 11 cross groove, 12 groove, 13 unloading hole, 14 through circular hole, 41 chuck lower layer, 42 chuck upper layer. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention;

[0032] Reference Figure 1-5 , a special tooling for a T-type specimen tensile test, comprising a bracket 1, and further comprising: two T-shaped pressing blocks 2 connected to the bracket 1 by bolts, a baffle 3 connected to the bracket 1 by bolts, a chuck 4 connected to the bracket 1 by the baffle 3, and a load-bearing bolt 5;

[0033] A cross groove 11 for mounting the T-shaped specimen and the chuck 4 is provided at the connection between the bracket 1 and the T-shaped pressing block 2 . The vertical portion of the T-shaped specimen passes through the upper end of the cross groove 11 , and the chuck is mounted at the lower end of the cross groove 11 .

[0034] Furthermore, the upper and lower ends of the cross groove 11 are open, the upper end of the cross groove 11 is a V-shaped opening, the width of the V-shaped opening gradually decreases from the inside to the outside of the cross groove 11, and the lower end of the cross groove is a T-shaped opening, and the upper part of the T-shaped opening is opened to form a groove 12 through a milling process.

[0035] Due to the differences in tests, the junction between the vertical portion and the clamping portion of the T-type specimen may have a welding feature, so that the upper opening of the cross groove 11 is set in a V shape to ensure that the T-type specimen can be placed in the cross groove 11.

[0036] Furthermore, four corners at the left and right ends of the cross groove 11 are each provided with a cylindrical force-releasing hole 13 that penetrates and is perpendicular to the bracket 1 .

[0037] The unloading hole 13 is a processing hole. During the tensile test, uneven stress distribution may occur. By setting unloading holes 13 at the four corners on the left and right ends of the cross groove 11, the failure risk caused by uneven stress distribution during clamping or stretching can be reduced, thereby playing a role in unloading and preventing interference.

[0038] Furthermore, a through cylindrical hole 14 perpendicular to the bracket 1 is symmetrically provided on both sides of the upper and lower ends of the cross groove 11, and a load-bearing bolt 5 is installed therein.

[0039] During the tensile test, since the design of the bracket 1 is only provided with a cross groove 11 on one side, the bracket 1 will be subjected to a large deformation stress during the tensile test. To this end, two through cylindrical holes 14 are respectively provided on both sides of the cross groove 11, and load-bearing bolts 5 are installed. These load-bearing bolts 5 can bear part of the load during the tensile test, thereby effectively resisting the deformation of the bracket 1, reducing its deformation degree, and significantly improving the stability and service life of the tooling.

[0040] Furthermore, the T-shaped test specimen is positioned front and rear on the bracket 1 by two T-shaped pressing blocks 2, and the two T-shaped pressing blocks 2 are fastened by bolts.

[0041] When the T-shaped specimen is placed in the cross groove 11, the two T-shaped pressing blocks 2 limit the forward and backward movement of the T-shaped specimen to prevent the T-shaped specimen from moving forward and backward and deforming abnormally.

[0042] The front and rear positioning of the T-type specimen is achieved by two symmetrically arranged T-type pressure blocks 2. The two T-type pressure blocks 2 are both located at the front end of the T-type specimen and are fastened to the bracket 1 by bolts. The rear end of the T-type specimen is directly supported by the bracket 1. After the T-type specimen is placed in the cross groove 11, the two T-type pressure blocks 2 effectively prevent the T-type specimen from shifting forward and backward during the test by limiting the front end position, thereby avoiding forward and backward movement or abnormal deformation.

[0043] Furthermore, the chuck 4 is divided into a chuck lower layer 41 and a chuck upper layer 42 at the connection between the chuck 4 and the bracket 1, and the length of the chuck upper layer 42 is less than the distance between the two load-bearing bolts 5. The chuck lower layer 41 is used to support the bracket 1 and to determine the position of the entire tooling. The function of the chuck upper layer 42 is to ensure the fixation of the bracket 1 during the tensile test, thereby ensuring the smooth progress and accuracy of the tensile test. The length of the chuck upper layer 42 is less than the distance between the two load-bearing bolts 5 to ensure that the load-bearing bolts 5 and the chuck upper layer 42 do not interfere with each other during the tensile test.

[0044] The main function of the chuck 4 is to support the entire tooling and ensure the smooth progress of the tensile test. After the chuck 4 is installed, it is necessary to use a level ruler at the upper end of the chuck 4 to level it and ensure that the chuck 4 is in a horizontal state.

[0045] The T-type specimen is installed on the fixed and leveled bracket 1. The T-type specimen is fixed by two symmetrically installed T-type pressure blocks 2, which are respectively located at the front and rear ends of the T-type specimen to limit the front and rear displacement of the specimen and prevent unnecessary movement or deformation during the stretching process.

[0046] Install the load-bearing bolt 5 on the bracket 1. The load-bearing bolt 5 bears part of the load applied by the specimen during the tensile test to prevent the bracket 1 from deforming, thereby ensuring the stability and long-term service life of the entire tooling. After that, the stand of the T-type specimen can be installed in the upper chuck of the tensile testing machine. Next, operate the tensile and fatigue testing machine to apply axial alternating loads to the T-type specimen to complete the tensile test.

Claims

1. A special tool for a T-type specimen tensile test, comprising a bracket (1), characterized in that: Also includes: Two T-shaped pressure blocks (2) connected to the bracket (1) via bolts, a baffle (3) connected to the bracket (1) via bolts, a clamp (4) connected to the bracket (1) via the baffle (3), and a load-bearing bolt (5); A cross groove (11) for mounting a T-shaped specimen and a chuck (4) is provided at the connection between the bracket (1) and the T-shaped pressing block (2); the vertical portion of the T-shaped specimen passes through the upper end of the cross groove (11), and the chuck is mounted at the lower end of the cross groove (11).

2. A special tooling for T-type specimen tensile test according to claim 1, characterized in that: The upper and lower ends of the cross groove (11) are open, the upper end of the cross groove (11) is a V-shaped opening, the width of the V-shaped opening gradually decreases from the inside of the cross groove (11) to the outside, and the lower end of the cross groove is a T-shaped opening, and the upper part of the T-shaped opening is opened to form a groove (12) by a milling process.

3. A special tooling for T-type specimen tensile test according to claim 2, characterized in that: Four corners at the left and right ends of the cross groove (11) are each provided with a cylindrical force-releasing hole (13) that penetrates the bracket (1) and is perpendicular to the bracket (1).

4. A special tooling for T-type specimen tensile test according to claim 3, characterized in that: A through cylindrical hole (14) perpendicular to the bracket (1) is symmetrically provided on both sides of the upper and lower ends of the cross groove (11), and a load-bearing bolt (5) is installed therein.

5. The special tooling for T-type specimen tensile test according to claim 1, characterized in that: The T-shaped test specimen is positioned front and rear on the bracket (1) by two T-shaped pressing blocks (2), and the two T-shaped pressing blocks (2) are fastened by bolts.

6. The special tooling for T-type specimen tensile test according to claim 1, characterized in that: The clamp (4) is divided into a clamp lower layer (41) and a clamp upper layer (42) at the connection between the clamp and the bracket (1), and the length of the clamp upper layer (42) is less than the distance between the two load-bearing bolts (5).

Images