Tensile strength measuring device for small-size test piece
By designing a device including an upper clamp, a limiting guide rail, a lower clamp, a connecting sleeve, and a baffle, the problem of centering small-sized test pieces was solved, enabling accurate tensile strength measurement and fracture analysis, and it is suitable for test pieces of brittle materials.
Patent Information
- Application Number
- CN202423286151.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-12-30
AI Technical Summary
Existing mechanical property testing methods are insufficient to meet the tensile strength testing requirements of small-sized test specimens, especially for brittle material test specimens where assembly is difficult and alignment is poor, leading to inaccurate test results.
A device comprising an upper clamp, a limiting guide rail, a lower clamp, a connecting sleeve, a connecting rod, auxiliary tooling, and a baffle was designed. Through ingenious structural design and baffle installation, the effective centering of the test piece is ensured. Combined with DIC deformation analysis, the tensile strength is accurately measured.
It enables effective tensile strength measurement of small-sized test specimens, avoids size constraints, and is suitable for test specimens that are difficult to measure using traditional methods, providing more accurate fracture analysis and tensile strength data.
Smart Images
Figure CN223565439U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of material mechanical property testing, in particular to a small-size test piece tensile strength measuring device. BACKGROUND
[0002] Tensile strength is the maximum capacity of the material to resist tensile failure, and is one of the important mechanical properties of the material. The current tensile strength test methods mainly include axial tensile method, bending method and Brazilian splitting method. The axial tensile method has high accuracy and is a direct measurement method, but it requires a large size test piece and complex preparation, and is generally used for tensile test of plastic materials, and is not suitable for brittle small-size metal ring. The bending method applies bending failure load to the test piece by three-point bending or four-point bending, and the tensile strength of the material is obtained by analyzing the failure load of the test piece. The test piece is generally a round bar or a cuboid structure. The Brazilian splitting method applies radial pressure to make the test piece produce tensile stress along the loading surface, and the tensile strength of the material is obtained by analyzing the failure load. The test piece is generally a cylinder, and the eccentricity of the applied load has a great influence on the test results, and even incorrect test results may be obtained.
[0003] The existing mechanical property test method cannot meet the tensile strength test requirements of small-size test pieces. Some brittle material test pieces, such as structural parts of metal hydride, are difficult to process into standard size test pieces due to special material structure and complex processing technology. On the existing test fixture, it is very difficult to assemble small-size test pieces, and it is difficult to ensure good centering, which has a great influence on the test results. Therefore, it is of great significance to obtain a small-size test piece tensile strength measuring device and a measuring method. SUMMARY
[0004] Therefore, the purpose of the present application is to provide a small-size test piece tensile strength measuring device for carrying out tensile strength test of small-size test pieces.
[0005] The present application adopts the following technical solutions:
[0006] A small-size test piece tensile strength measuring device, the device comprises an upper clamp, a limiting guide rail, a lower clamp, a connecting sleeve, a connecting rod, an auxiliary tool and a baffle, the upper end of the upper clamp is connected with a material testing machine, the middle line of the lower end face is provided with a groove, the limiting guide rail restricts the movement of the upper clamp along the limiting guide rail, the lower end of the limiting guide rail is connected with the lower clamp, the middle line of the upper end face of the lower clamp is provided with a groove, and the connecting rod is assembled with the lower end of the lower clamp through the connecting sleeve to form a ball sleeve structure.
[0007] Further, the plane size of the upper clamp is smaller than the plane size formed by the continuous center line of the upper limiting guide rail mounting hole of the lower clamp.
[0008] Further, the upper clamp plane four corners are processed with the recesses with the same radius as the limiting guide rail, and the limiting guide rail forms a limiting structure.
[0009] Further, the upper clamp lower end surface and the recess of the lower clamp upper end surface are mirror-symmetrically distributed.
[0010] Further, the recess is processed according to the size of the test piece.
[0011] Further, the ball sleeve structure formed by the connecting rod, the connecting sleeve and the lower clamp lower end can adjust the activity angle and the tightness degree through the connecting sleeve.
[0012] Further, the limiting guide rail and the lower clamp upper end surface are provided with recesses for installing the baffle.
[0013] Further, the auxiliary tool is a clamping piece type, symmetrically two, and a recess is arranged in the middle of the symmetric surface.
[0014] The tensile strength measuring device for small-size test pieces can obtain the effective tensile strength of the small-size test pieces, is not restricted by the size of the test pieces, is particularly suitable for small-size test pieces that cannot be measured by the traditional method, and aims at obtaining the tensile strength of the test pieces and helping to better understand the properties of the test pieces.
[0015] The tensile strength measuring device for small-size test pieces provided in the application solves the centering problem of loading of small-size test pieces.
[0016] The arc recess is designed according to the diameter of the test piece, so that the test piece is subjected to tensile rupture, and yield and fragmentation are avoided.
[0017] The application has a simple structure, the baffle is installed in a clever manner, the test pieces are conveniently collected after being damaged, and the subsequent fracture analysis is facilitated.
[0018] The application is simple to operate, the deformation amount of the test piece is obtained by DIC, the fracture mode of the test piece is assisted to judge, and the tensile strength of the test piece can be more accurately obtained by combining the calculation formula. DETAILED DESCRIPTION
[0019] Figure 1 It is a schematic view of the tensile strength measuring device for small-size test pieces in the embodiment of the application; Figure 2 It is an assembly schematic view of the lower clamp, the spherical connecting rod and the connecting sleeve in the embodiment of the application; Figure 3 It is an assembly schematic view of the upper clamp, the test piece, the auxiliary tool and the lower clamp: 1-upper clamp, 2-limiting guide rail, 3-lower clamp, 4-connecting sleeve, 5-spherical connecting rod, 6-test piece, 7-auxiliary tool, 8-baffle; DETAILED DESCRIPTION
[0020] Embodiment 1
[0021] The application provides a small-size test piece tensile strength measuring device, as shown in the drawings, which is composed of an upper clamp 1, a limiting guide rail 2, a lower clamp 3, a connecting sleeve 4, a spherical connecting rod 5, an auxiliary tool 7 and a baffle 8. Figure 1 The upper end of the upper clamp 1 is connectable to a material testing machine, the lower end of the upper clamp 1 is a rectangular plane, and there is a circular-arc-shaped groove at the center line of the plane; the upper end of the limiting guide rail 2 is a taper, and the lower end of the limiting guide rail 2 is fixed to the lower clamp through bolts; the upper end surface of the lower clamp 3 is a rectangular plane, and there is a circular-arc-shaped groove at the center line of the plane, and there is a spherical groove at the lower end surface of the lower clamp 3; the spherical connecting rod 5 is assembled with the lower end of the lower clamp 3 through the connecting sleeve 4 to form a ball sleeve structure; the auxiliary tool 6 is a clamping piece type, and there are two symmetrical auxiliary tools 6, and a rectangular groove is formed in the middle of the symmetrical surface.
[0022] Further, the size of the rectangular plane of the upper clamp 1 is slightly smaller than the size of the plane formed by the center lines of the limiting guide rail mounting hole positions of the lower clamp 3.
[0023] Further, the four corners of the rectangular plane of the upper clamp 1 are provided with grooves with a radius consistent with the radius of the limiting guide rail 2, and the limiting guide rail 2 and the limiting guide rail 2 form a limiting structure, and the limiting guide rail 2 passes through the upper clamp 1 to constrain the position and move the upper clamp 1 along the limiting guide rail 2.
[0024] Further, the circular-arc-shaped grooves on the lower end surface of the upper clamp 1 and the upper end surface of the lower clamp 3 are mirror-symmetrically distributed.
[0025] Further, the circular-arc-shaped grooves are processed according to the size of the test piece.
[0026] Further, the ball sleeve structure formed by the spherical connecting rod 5, the connecting sleeve 4 and the lower end of the lower clamp 3 can adjust the activity angle and the tightness degree through the connecting sleeve.
[0027] Further, the limiting guide rail 2 and the upper end surface of the lower clamp 3 are provided with grooves for installing the baffle 8.
[0028] The application has been described in detail with reference to specific embodiments and exemplary examples, and the above description is exemplary and is not exhaustive, and is not limited to the disclosed embodiments; the above description cannot be understood as a limitation of the application. Those skilled in the art understand that the technical solutions and embodiments of the application can be variously replaced, modified or improved without departing from the spirit and scope of the application, and these all fall within the scope of the application; the protection scope of the application is subject to the appended claims.
Claims
1. A small size test piece tensile strength measuring device characterized by, The device comprises an upper clamp (1), a limiting guide rail (2), a lower clamp (3), a connecting sleeve (4), a connecting rod (5), an auxiliary tool (7) and a baffle (8), the upper clamp (1) is connected with a material testing machine at the upper end, and a groove is arranged at the middle line of the lower end surface, the limiting guide rail (2) restricts the movement of the upper clamp (1) along the limiting guide rail (2), the lower end of the limiting guide rail (2) is connected with the lower clamp (3), a groove is arranged at the middle line of the upper end surface of the lower clamp (3), and the connecting rod (5) is assembled with the lower end of the lower clamp (3) through the connecting sleeve (4) to form a ball sleeve structure.
2. A device for measuring tensile strength of small test pieces according to claim 1, characterized in that The plane size of the upper clamp (1) is smaller than the plane size formed by the center line of the upper limiting guide rail (2) mounting hole of the lower clamp (3).
3. A device for measuring tensile strength of small test pieces according to claim 1, characterized in that The four corners of the plane of the upper clamp (1) are provided with grooves with the same radius as the radius of the limiting guide rail (2), and the limiting guide rail (2) forms a limiting structure.
4. The apparatus of claim 1, wherein, The grooves on the lower end surface of the upper clamp (1) and the upper end surface of the lower clamp (3) are mirror-symmetrically distributed.
5. The apparatus of claim 1, wherein, The grooves are machined according to the size of the test piece.
6. A device for measuring tensile strength of small test pieces according to claim 1, characterized in that The ball sleeve structure formed by the connecting rod (5), the connecting sleeve (4) and the lower end of the lower clamp (3) can adjust the activity angle and the tightness degree through the connecting sleeve.
7. The apparatus of claim 1, wherein, The limiting guide rail (2) and the upper end surface of the lower clamp (3) are provided with grooves for mounting the baffle (8).
8. The apparatus of claim 1, wherein, The auxiliary tool (7) is a clamping piece type, and two symmetric auxiliary tools are provided with grooves in the middle of the symmetric surface.