CN209858334U

CN209858334U - Dull and stereotyped fatigue test sample buckling restrained clamping device with antiskid function

Info

Publication number: CN209858334U
Application number: CN201920359710.1U
Authority: CN
Inventors: 孟庆刚; 郭晶; 韩丹; 王亚芬; 王立刚; 赵广东; 李志伟
Original assignee: Bengang Steel Plates Co Ltd
Current assignee: Bengang Steel Plates Co Ltd
Priority date: 2019-03-21
Filing date: 2019-03-21
Publication date: 2019-12-27
Anticipated expiration: 2029-03-21

Abstract

The utility model discloses a flat fatigue sample buckling-restrained clamping device with anti-sliding function, wherein an up-and-down through groove is arranged on the inner smooth surface of the clamping device at one side, the width of the groove is the same as that of a sample, and the sample is just fixed in the groove; the inner smooth surface of the clamping device on the other side is provided with a protrusion which corresponds to the groove and penetrates through the groove up and down; therefore, the clamping devices on the two sides can stably fix the sample in the groove, and even if the sample does not slide relatively in the process of tension and compression, the clamping devices do not touch the extensometer; the utility model has the advantages that: the groove and the bulge structure ensure the accurate fixation of the position of the clamping device and can effectively prevent the clamping device from contacting with the extensometer; the sample thickness range that new clamping device was suitable for is very big, only needs a clamping device can satisfy the fatigue test of multiple thickness specification panel.

Description

Dull and stereotyped fatigue test sample buckling restrained clamping device with antiskid function

Technical Field

The utility model relates to the field of machinary, a fixing device of fatigue testing machine appearance piece specifically says so.

Background

When a low-cycle fatigue test is carried out on a flat metal plate sample, the sample can be bent under the action of pressure stress, so that the test is abnormally terminated. To prevent the sample from bending, a clamping device is usually used to fix the flat sample between two clamping devices. In the process of carrying out the fatigue test, friction force exists between the clamping device and the fatigue test sample, so that in order to reduce the influence of the friction force on the test result, too large clamping force cannot be applied to the clamping device, and meanwhile, after the test sample is subjected to tensile stress, the thickness of the test sample is slightly reduced, and the clamping force is further reduced.

The inner side of the conventional clamping device is a plane, and if the clamping force is too small, the clamping device is deviated from the center of the sample, as shown in fig. 1. If the deviated clamping device and the extensometer are contacted, the measurement error of the extensometer can be caused, and the abnormal termination of the test is triggered.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model aims at providing a clamping device need not exert great clamping-force to dull and stereotyped sample promptly, and guarantees that the position of dull and stereotyped sample is accurate fixed, and concrete technical scheme is as follows:

a flat fatigue sample buckling-preventing clamping device with an anti-sliding function is characterized in that an up-and-down through groove is formed in the inner smooth surface of the clamping device on one side, the width of the groove is the same as that of a sample, and the sample is just fixed in the groove; the inner smooth surface of the clamping device on the other side is provided with a protrusion which corresponds to the groove and penetrates through the groove up and down; therefore, the clamping devices on the two sides can stably fix the sample in the groove, and even if the sample is not slid relatively in the pulling and pressing process, the clamping devices cannot touch the extensometer.

The depth of the groove is equal to the height of the protrusion, and the depth of the groove is larger than the thickness of a common test flat plate.

After clamping and fixing, the clamping devices are distributed on two sides of the flat plate sample and have the same weight, so that the influence of sample bending on test precision is prevented.

The utility model has the advantages that: the flat plate sample can be prevented from bending only by a small clamping force, so that the adverse effect of friction force on a fatigue test result is greatly reduced; the groove and the bulge structure ensure the accurate fixation of the position of the clamping device and can effectively prevent the clamping device from contacting with the extensometer; the sample thickness range that new clamping device was suitable for is very big, only needs a clamping device can satisfy the fatigue test of multiple thickness specification panel.

Drawings

FIG. 1 is a schematic view of a prior art clamping device off-center of a sample;

FIG. 2 is a schematic view of a conventional clamping device;

fig. 3 is a schematic structural diagram of the present invention.

Detailed Description

The present invention is described in detail with reference to the accompanying drawings, as shown in fig. 1, fig. 2 and fig. 3, an up-down through groove 1 is formed on the inner smooth surface of the clamping device on one side, and the width of the groove 1 is the same as that of the sample 3, so that the sample 3 can be fixed in the groove 1; a bulge 2 which corresponds to the groove 1 and penetrates up and down is arranged on the clamping device on the other side; thus, the two clamping devices can stably fix the sample 3 in the groove, and even if the sample is pulled and pressed, the sample does not slide relatively, and the clamping devices do not touch the extensometer.

The depth of the groove 1 is equal to the height of the protrusion 2, and the depth of the groove and the height of the protrusion are both larger than the thickness of a common test flat plate, so that one set of device can meet all common thickness specifications of fatigue test samples.

In order to prevent the clamping device from causing the bending of the sample and influencing the test precision, after the clamping device is fixed by using the bolts, the weight of the clamping device is approximately the same on two sides of the flat plate sample.

Claims

1. The utility model provides a dull and stereotyped fatigue test sample buckling restrained clamping device with antiskid function, its characterized in that: an up-down through groove is formed in the inner smooth surface of the clamping device on one side, the width of the groove is the same as that of a sample, and the sample is just fixed in the groove; the inner smooth surface of the clamping device on the other side is provided with a protrusion which corresponds to the groove and penetrates through the groove up and down; therefore, the clamping devices on the two sides can stably fix the sample in the groove, and even if the sample is not slid relatively in the pulling and pressing process, the clamping devices cannot touch the extensometer.

2. The anti-bending clamping device for the flat fatigue test piece with the anti-sliding function according to claim 1, which is characterized in that: the depth of the groove is equal to the height of the protrusion, and the depth of the groove is larger than the thickness of a common test flat plate.

3. The anti-bending clamping device for the flat fatigue test piece with the anti-sliding function according to claim 2, characterized in that: after clamping and fixing, the clamping devices are distributed on two sides of the flat plate sample and have the same weight, so that the influence of sample bending on test precision is prevented.