Sample clamp for plate tensile fatigue test

Abstract

The utility model relates to a sample clamp for a tensile fatigue test of a plate. The sample clamp comprises an upper clamp and a lower clamp which can be arranged on a fatigue testing machine and are opposite to each other up and down, a sample piece is arranged between the upper clamp and the lower clamp; the upper clamp comprises a first bottom plate, two first bolt plates and a first bolt; the two first plug pin plates are arranged on the first bottom plate in parallel at an interval, and first plug pin holes which directly face each other are formed in the two first plug pin plates; the first bolt is matched with the first bolt hole; the lower clamp comprises a second bottom plate, two second bolt plates and a second bolt; the two second plug pin plates are arranged on the second bottom plate in parallel at an interval, and second plug pin holes which directly face each other are formed in the two second plug pin plates; the second bolt is matched with the second bolt hole; the first bolt plate and the second bolt plate are arranged oppositely; and the sample piece is fixed on the first bolt plate and the second bolt plate through the first bolt and the second bolt.

Description

Technical Field

[0001] The utility model belongs to the technical field of testing instruments, and in particular relates to a sample clamp for a plate tensile fatigue test. Background Art

[0002] The tensile test of a material refers to a test method for measuring the properties of a material under an axial tensile load; the fatigue test refers to a test method for measuring the properties of a material under an alternating load; the fatigue test can be used to calculate the fatigue strength (fatigue limit) of the material, draw the SN (stress-life) curve of the material, etc.

[0003] The function of the specimen fixture is to form a mechanical connection between the specimen and the testing machine, transfer the movement of the actuator to the specimen, and then transmit the test load generated in the specimen to the force sensor; the tensile fatigue test has the following characteristics: 1. There is usually more than one test piece for the test, so the specimen needs to be disassembled and installed many times during the test. 2. During the fatigue test, the actuator will apply repeated loads, which increases the requirements for the clamping force and fatigue performance of the specimen fixture. This requires the specimen fixture to have stability and reliability in positioning the specimen during the test; have sufficient load-bearing or clamping force to ensure the specimen is loaded on the fixture; and simple and fast operation can be achieved during the clamping process.

[0004] At present, the most widely used clamps for tensile tests are wedge-shaped clamps. However, the initial clamping force of the wedge-shaped clamp is small. As the test force increases, the clamping force increases accordingly. In addition, for the wedge-shaped clamp, the left-right alignment is guaranteed by the clamp, but it is easy to be tilted front and back. After tilting, the force on both sides of the specimen is uneven during the tensile process, which may cause the specimen to tear.

[0005] Based on the above problems, the utility model proposes a sample fixture for plate tensile fatigue test. Utility Model Content

[0006] The utility model aims to provide a sample clamp for plate tensile fatigue test, which clamps and fixes the sample through an upper clamp and a lower clamp, thereby simplifying the clamping process and improving the test efficiency.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] A sample fixture for plate tensile fatigue test, comprising an upper fixture and a lower fixture which can be arranged on a fatigue testing machine and are directly opposite to each other;

[0009] A sample is arranged between the upper fixture and the lower fixture;

[0010] The upper fixture comprises a first bottom plate, two first latch plates, and a first latch;

[0011] Two first latch plates are arranged parallel to each other on the first bottom plate, and the two first latch plates are provided with first latch holes facing each other;

[0012] The first latch pin is adapted to the first latch pin hole;

[0013] The lower fixture comprises a second bottom plate, two second latch plates, and a second latch;

[0014] Two second latch plates are arranged parallel to each other on the second bottom plate, and the two second latch plates are provided with second latch holes facing each other;

[0015] The second latch pin is adapted to the second latch pin hole;

[0016] The first latch plate and the second latch plate are arranged opposite to each other;

[0017] The sample piece is fixed on the first latch plate and the second latch plate through the first latch pin and the second latch pin.

[0018] Furthermore, the first bottom plate and the second bottom plate are both provided with a slide groove at the bottom of the left side, and the first latch plate and the second latch plate facing each other on the left side are provided with a sliding block, and the sliding block is adapted to the slide groove.

[0019] Furthermore, a slide groove is provided at the bottom of the right side of the first bottom plate and the second bottom plate, and a slider is provided on the first latch plate and the second latch plate facing the right side, and the slider is adapted to the slide groove.

[0020] Furthermore, the first latch plate and the second latch plate are respectively provided with a plurality of first latch holes and second latch holes of the same diameter, and collars are provided in the first latch holes and the second latch holes, and the diameters of the collars are adapted to the first latch and the second latch.

[0021] Furthermore, the first latch plate is provided with a plurality of first latch holes and a plurality of third latch holes, the aperture of the first latch holes is smaller than the aperture of the third latch holes, and the first latch holes and the third latch holes are arranged alternately;

[0022] The second latch plate is provided with a plurality of second latch holes and a plurality of fourth latch holes, the aperture of the second latch holes is smaller than the aperture of the fourth latch holes, and the second latch holes are alternately arranged with the fourth latch holes.

[0023] Furthermore, the opposite side walls of the two first latch plates and the two second latch plates are provided with springs.

[0024] Furthermore, gaskets are provided at the intervals formed by the two first latch plates and the first bottom plate, and at the intervals formed by the two second latch plates and the second bottom plate.

[0025] The utility model adopts the above technical solution, which has the following advantages:

[0026] Compared with the prior art, the utility model discloses a specimen clamp for tensile fatigue test of a plate. The device matches the upper end of the specimen with the first pin holes on the two first pin plates through the first pin pin of the upper clamp, so as to clamp and fix the upper end of the specimen; the lower end of the specimen matches the second pin holes on the two second pin plates through the second pin pin of the lower clamp, so as to clamp and fix the lower end of the specimen; the upper clamp, the lower clamp and the specimen form a whole and have a certain rigidity. During the tensile and compressive fatigue test, the two sides of the specimen are subjected to uniform force, which simplifies the clamping process, improves the test efficiency, and ensures the stability and reliability of the specimen positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The utility model is a schematic diagram of the sample fixture structure for the plate tensile fatigue test.

[0028] Figure 2 It is a side view of the connection between the specimen fixture and the specimen.

[0029] Figure 3 is a side view of the specimen fixture.

[0030] Figure 4 This is the front view of the specimen fixture.

[0031] The figure numbers are as follows: 1-upper clamp, 101-first base plate, 102-first latch plate, 103-first latch, 104-first latch hole, 105-third latch hole, 2-lower clamp, 201-second base plate, 202-second latch plate, 203-second latch, 204-second latch hole, 205-fourth latch hole, 3-sample piece. DETAILED DESCRIPTION

[0032] The following will be combined with the accompanying drawings to describe the preferred embodiments of the present invention in detail, so as to more clearly understand the purpose, characteristics and advantages of the present invention. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0033] The present embodiment provides a specimen fixture for a tensile fatigue test of a plate, comprising an upper fixture 1 and a lower fixture 2 which can be arranged on a fatigue testing machine and are opposite to each other in the upper and lower directions; a specimen 3 is arranged between the upper fixture 1 and the lower fixture 2; the upper fixture 1 comprises a first bottom plate 101, two first latch plates 102, and a first latch 103; the two first latch plates 102 are arranged on the first bottom plate 101 in parallel with each other at a distance, and the two first latch plates 102 are provided with first latch holes 104 which are opposite to each other; the first latch pin 103 is adapted to be inserted into the first latch hole 104; The lower fixture 2 includes a second base plate 201, two second latch plates 202, and a second latch pin 203; the two second latch plates 202 are arranged on the second base plate 201 at a distance and in parallel, and the two second latch plates 202 are provided with second latch holes 204 facing each other; the second latch pin 203 is adapted to the second latch hole 204; the first latch plate 102 and the second latch plate 202 are arranged facing each other; the specimen 3 is fixed on the first latch plate 102 and the second latch plate 202 by the first latch pin 103 and the second latch pin 203.

[0034] The upper clamp and the lower clamp in this embodiment are connected to the test device by bolts, and the specific size and material of the bottom plate and the latch plate, as well as the size, number and position of the holes of the latch plate can be designed according to specific test requirements.

[0035] When in use, first fix the upper clamp and the lower clamp to the experimental device by bolts, then place the specimen between the first latch plate and the second latch plate, align the holes of the specimen with the first latch hole and the second latch hole, and then insert the first latch and the second latch to fix the position; input the tension and compression fatigue test parameters into the fatigue testing machine, and the tension or pressure is transmitted to the upper clamp and the lower clamp through the fatigue testing machine, and then rigidly transmitted to the specimen to achieve the application of tensile or compressive load during the tension and compression fatigue test; after the test is completed, pull out the latch, replace the specimen, and reinsert the latch to complete the replacement of the specimen.

[0036] The device has multiple holes on the latch plate for the latch to penetrate and fix the workpiece; the device is used in the plate tensile fatigue test to meet the stability and reliability of the workpiece positioning during use.

[0037] As a preferred embodiment, a slide groove is provided at the bottom of the left side of the first bottom plate 101 and the second bottom plate 201, and a slider is provided on the first latch plate 102 and the second latch plate 202 opposite to the left side, and the slider is adapted to the slide groove; the slide groove slider is provided on the first bottom plate and the first latch plate to complete the adjustment of the clamping distance of the upper clamp to the specimen, so as to meet the clamping of the upper clamping end of specimens of different sizes; the slide groove slider is provided on the second bottom plate and the second latch plate to complete the adjustment of the clamping distance of the lower clamp to the specimen, so as to meet the clamping of the lower clamping end of specimens of different sizes.

[0038] As a preferred embodiment, a slide groove is provided at the bottom of the right side of the first bottom plate 101 and the second bottom plate 201, and a slider is provided on the first latch plate 102 and the second latch plate 202 facing the right side, and the slider is adapted to the slide groove. The latch plates on both sides of the bottom plate can be adjusted, so that the upper and lower clamps can adjust the clamping distance of the specimen more flexibly, and can meet the clamping requirements of the clamping ends of specimens of different sizes to a greater extent.

[0039] Specifically, a plurality of first latch holes 104 and second latch holes 204 of the same diameter are respectively formed on the first latch plate 102 and the second latch plate 202, and collars are arranged in the first latch holes 104 and the second latch holes 204, and the diameters of the collars are adapted to the first latch pin 103 and the second latch pin 203. A plurality of collars of different diameters can be arranged, and the diameters of the collars are designed according to the diameters of the latch pins and the diameters of the holes of the specimens. When in use, collars matching the latch pins and the specimens are inserted into the latch holes, so that the upper and lower clamps can adjust the collars fixing the latch pins according to the hole sizes of the specimens, thereby satisfying the clamping and fixing of specimens of different sizes to a greater extent.

[0040] The device can adjust the pin diameter and material according to the load requirements, and ensure that there is sufficient load-bearing and clamping force to ensure that the workpiece is tested on the fixture.

[0041] As a preferred embodiment, the first latch plate 102 is provided with a plurality of first latch holes 104 and a plurality of third latch holes 105, the aperture of the first latch hole 104 is smaller than the aperture of the third latch hole 105, and the first latch holes 104 and the third latch holes 105 are arranged alternately; the second latch plate 202 is provided with a plurality of second latch holes 204 and a plurality of fourth latch holes 205, the aperture of the second latch hole 204 is smaller than the aperture of the fourth latch hole 205, and the second latch holes 204 and the fourth latch holes 205 are arranged alternately. Latch holes with different apertures can meet the needs of specimens with different apertures and meet the needs of clamping and fixing specimens of different sizes.

[0042] The device is very convenient to insert and remove the latch; it meets the requirements of simple and quick operation during the clamping process; the latch is the most vulnerable part; the latch can be quickly replaced; positioning is performed through the holes on the latch plate; and the reliability of repeated positioning of the fixture during adjustment or replacement is met.

[0043] The whole tooling only includes a base plate, a latch plate and a latch. It has a simple structure, low manufacturing cost and can be produced in a systematic and standardized manner.

[0044] The bottom plate of the device is a plate connected to the test device; the thickness of the plate can be adjusted according to the actual force and handling requirements to meet the corresponding rigidity and bearing capacity.

[0045] The latch plate of the device is a plate with holes opened according to the diameter of the latch for inserting the latch to fix the test piece. The thickness, hole position and number of holes of the latch plate can be adjusted according to the size of the actual test piece and the requirement of loading force.

[0046] The pin of the device is used to connect the test piece and the fixture, and the diameter of the pin and the strength of the material used can be adjusted according to the size of the load applied in the actual test.

[0047] Specifically, springs are provided on the opposite side walls of the two first latch plates 102 and the two second latch plates 202. The springs are provided between the specimen and the latch plates to increase the stability of the specimen during the fatigue test.

[0048] Specifically, gaskets are provided at the intervals formed by the two first latch plates 102 and the first bottom plate 101, and at the intervals formed by the two second latch plates 202 and the second bottom plate 201. The gaskets are provided to prevent the specimen from being damaged on the surface during the fatigue test.

[0049] In this device, the upper end of the specimen is clamped and fixed by cooperating with the first pin holes on the two first pin plates through the first pin of the upper clamp; the lower end of the specimen is clamped and fixed by cooperating with the second pin holes on the two second pin plates through the second pin of the lower clamp; the upper clamp, the lower clamp and the specimen form a whole and have a certain rigidity. During the tension and compression fatigue test, the tension / pressure is transmitted from the clamp to the specimen through the actuator of the fatigue testing machine to carry out the fatigue test, thereby realizing the application of tensile / compression loads in the tension and compression fatigue test.

Claims

1. A specimen fixture for plate tensile fatigue test, characterized in that: It comprises an upper clamp (1) and a lower clamp (2) which can be arranged on a fatigue testing machine and are directly opposite to each other. A sample piece (3) is arranged between the upper clamp (1) and the lower clamp (2); The upper clamp (1) comprises a first bottom plate (101), two first latch plates (102), and a first latch (103); The two first latch plates (102) are arranged in parallel and at a distance from each other on the first bottom plate (101), and the two first latch plates (102) are provided with first latch holes (104) facing each other; The first latch pin (103) is adapted to fit the first latch pin hole (104); The lower clamp (2) comprises a second bottom plate (201), two second latch plates (202), and a second latch (203); Two second latch plates (202) are arranged in parallel and at a distance from each other on the second bottom plate (201), and the two second latch plates (202) are provided with second latch holes (204) facing each other; The second latch pin (203) is adapted to the second latch pin hole (204); The first latch plate (102) and the second latch plate (202) are arranged opposite to each other; The sample piece (3) is fixed on the first latch plate (102) and the second latch plate (202) via the first latch pin (103) and the second latch pin (203).

2. A specimen fixture for plate tensile fatigue test according to claim 1, characterized in that: The first bottom plate (101) and the second bottom plate (201) are both provided with a slide groove at the bottom of the left side, and the first latch plate (102) and the second latch plate (202) facing each other on the left side are provided with a sliding block, and the sliding block is adapted to the slide groove.

3. A specimen fixture for plate tensile fatigue test according to claim 1 or 2, characterized in that: The first bottom plate (101) and the second bottom plate (201) are provided with a sliding groove at the bottom of the right side, and the first latch plate (102) and the second latch plate (202) facing the right side are provided with a sliding block, and the sliding block is adapted to the sliding groove.

4. A specimen fixture for plate tensile fatigue test according to claim 3, characterized in that: The first latch plate (102) and the second latch plate (202) are respectively provided with a plurality of first latch holes (104) and second latch holes (204) of the same diameter, and sleeve rings are arranged in the first latch holes (104) and the second latch holes (204), and the diameter of the sleeve rings is adapted to the first latch pin (103) and the second latch pin (203).

5. A specimen fixture for plate tensile fatigue test according to claim 4, characterized in that: The first latch plate (102) is provided with a plurality of first latch holes (104) and a plurality of third latch holes (105), the diameter of the first latch holes (104) being smaller than the diameter of the third latch holes (105), and the first latch holes (104) and the third latch holes (105) being arranged alternately; The second latch plate (202) is provided with a plurality of second latch holes (204) and a plurality of fourth latch holes (205); the diameter of the second latch holes (204) is smaller than the diameter of the fourth latch holes (205); the second latch holes (204) and the fourth latch holes (205) are arranged alternately.

6. A specimen fixture for plate tensile fatigue test according to claim 5, characterized in that: The opposite side walls of the two first latch plates (102) and the two second latch plates (202) are both provided with springs.

7. A specimen fixture for plate tensile fatigue test according to claim 6, characterized in that: Gaskets are provided at the intervals formed between the two first latch plates (102) and the first bottom plate (101) and between the two second latch plates (202) and the second bottom plate (201).

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