Device for automatically calculating percentage elongation after fracture of round bar dumbbell-shaped sample

Abstract

The utility model discloses a device for automatically calculating the percentage elongation after fracture of a round bar dumbbell-shaped sample, and relates to the technical field of material testing devices. The device comprises a video extensometer, a light source, a pneumatic shoulder clamp, a video extensometer support and a main support, the pneumatic shoulder clamp is installed on a tensile testing machine, the video extensometer and the light source are both installed on the video extensometer support, the video extensometer support is installed on the main support, and the video extensometer support is located right behind the pneumatic shoulder clamp. The device disclosed by the utility model has the beneficial effects that the percentage elongation after fracture is automatically measured through the video extensometer, and manual sample splicing and sample elongation measurement are not needed any more, so that the process of a material tensile test is simplified, a large amount of test time is saved, and the accuracy and the reliability of a test result are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of material testing devices, in particular to a device for automatically obtaining the post-fracture elongation of a round bar dumbbell-shaped sample. Background Art

[0002] When studying the fully automatic tensile testing machine, in order to measure the elongation after fracture of the dumbbell-shaped round bar specimen, it is often necessary to mark the specimen in advance, then re-splice the specimen after it breaks, and finally use a vernier caliper to manually measure the elongation after fracture of the specimen. Not only is there a certain degree of difficulty in operation, it often requires two people to cooperate and spend a lot of time, and the accuracy of the results of manually splicing specimens and measuring elongation is not high. Utility Model Content

[0003] The purpose of the utility model is to provide a device for automatically obtaining the elongation after fracture of a round bar dumbbell-shaped specimen in view of the shortcomings and defects in the prior art. The device automatically measures the elongation after fracture through a video extensometer, and there is no need to manually splice specimens and measure the elongation of specimens, which simplifies the process of material tensile testing, saves a lot of testing time, and improves the accuracy and reliability of test results.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme: a device for automatically obtaining the elongation after fracture of a round bar dumbbell-shaped specimen, which includes a video extensometer 1, a light source 2, a pneumatic shoulder clamp 3, a video extensometer bracket 4, and a main bracket 5. The pneumatic shoulder clamp 3 is installed on a tensile testing machine, the video extensometer 1 and the light source 2 are both installed on the video extensometer bracket 4, the video extensometer bracket 4 is installed on the main bracket 5, and the video extensometer bracket 4 is located directly behind the pneumatic shoulder clamp 3.

[0005] Furthermore, two light sources 2 are provided, and the two light sources 2 are respectively arranged on the left and right sides of the video extensometer 1 .

[0006] Furthermore, the connection between the pneumatic shoulder clamp 3 and the dumbbell-shaped round bar specimen adopts a contoured design, and the specimen is clamped by air pressure.

[0007] Furthermore, the video extensometer bracket 4 can adjust the installation height and direction of the video extensometer 1 and the two light sources 2 .

[0008] Furthermore, the two light sources 2 are long strips.

[0009] After adopting the above technical scheme, the beneficial effects of the utility model are as follows: the device automatically measures the elongation after fracture through a video extensometer, and there is no need to manually splice samples and measure the elongation of samples, which simplifies the process of material tensile testing, saves a lot of testing time, and improves the accuracy and reliability of test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0011] Figure 1 It is a structural schematic diagram of the utility model.

[0012] Figure 2 It is a schematic diagram of the structure of removing the pneumatic shoulder clamp 3 in the utility model.

[0013] Figure 3 It is a structural schematic diagram of the pneumatic shoulder clamp 3 in the utility model.

[0014] Description of the accompanying drawings: video extensometer 1, light source 2, pneumatic shoulder clamp 3, video extensometer bracket 4, main bracket 5. DETAILED DESCRIPTION

[0015] See also Figure 1-Figure 3 As shown, the technical solution adopted in this specific embodiment is: it includes a video extensometer 1, a light source 2, a pneumatic shoulder clamp 3, a video extensometer bracket 4, and a main bracket 5, the pneumatic shoulder clamp 3 is installed on the tensile testing machine, the video extensometer 1 and the light source 2 are both installed on the video extensometer bracket 4, the video extensometer bracket 4 is installed on the main bracket 5, and the video extensometer bracket 4 is located directly behind the pneumatic shoulder clamp 3.

[0016] Furthermore, two light sources 2 are provided, and the two light sources 2 are respectively arranged on the left and right sides of the video extensometer 1. By adjusting the height and direction of the video extensometer 1, the sample can be placed directly in front of the center of the field of view of the video extensometer 1.

[0017] Furthermore, the connection between the pneumatic shoulder clamp 3 and the dumbbell-shaped round bar sample is designed in a contoured manner, and the sample is clamped by air pressure, so that the pneumatic shoulder clamp 3 can clamp the dumbbell-shaped round bar sample more stably.

[0018] Furthermore, the video extensometer bracket 4 can adjust the installation height and direction of the video extensometer 1 and the two light sources 2. By adjusting the video extensometer bracket 4, the video extensometer 1 and the two light sources 2 can be aligned with the center of the sample.

[0019] Furthermore, the two light sources 2 are long strips, and can evenly illuminate the parallel sections of the dumbbell-shaped round bar sample and provide sufficient light.

[0020] The working principle of the utility model is as follows: when in use, first put the dumbbell-shaped round bar sample into the pneumatic shoulder clamp 3 and clamp it, and then the tensile testing machine drives the pneumatic shoulder clamp 3 to stretch the sample until it breaks. After the sample is clamped, the two light sources 2 are turned on. At this time, the video extensometer 1 starts to track the elongation of the sample. After the sample breaks, the elongation of the sample after fracture is automatically calculated (the ratio of the residual elongation (Lu-Lo) of the gauge length after fracture to the original gauge length (Lo), expressed in %). Among them, the clamp in this device is not limited to the pneumatic shoulder clamp 3, and other types of clamps can be installed according to design requirements. In addition, the shape of the two light sources 2 is not limited to long strips, and light sources of other shapes that meet actual use requirements can also be used.

[0021] The above description is only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. A device for automatically obtaining the elongation after fracture of a round bar dumbbell-shaped specimen, characterized in that: It comprises a video extensometer (1), a light source (2), a pneumatic shoulder clamp (3), a video extensometer bracket (4), and a main bracket (5). The pneumatic shoulder clamp (3) is installed on a tensile testing machine. The video extensometer (1) and the light source (2) are both installed on the video extensometer bracket (4). The video extensometer bracket (4) is installed on the main bracket (5), and the video extensometer bracket (4) is located directly behind the pneumatic shoulder clamp (3).

2. The device for automatically obtaining the elongation after fracture of a round bar dumbbell-shaped specimen according to claim 1, characterized in that: Two light sources (2) are provided, and the two light sources (2) are respectively arranged on the left and right sides of the video extensometer (1).

3. The device for automatically obtaining the elongation after fracture of a round bar dumbbell-shaped specimen according to claim 1, characterized in that: The connection between the pneumatic shoulder clamp (3) and the dumbbell-shaped round bar sample is designed in a contour-like manner, and the sample is clamped by air pressure.

4. The device for automatically obtaining the elongation after fracture of a round bar dumbbell-shaped specimen according to claim 1, characterized in that: The video extensometer bracket (4) can adjust the installation height and direction of the video extensometer (1) and the two light sources (2).

5. The device for automatically obtaining the elongation after fracture of a round bar dumbbell-shaped specimen according to claim 1, characterized in that: The two light sources (2) are long strips.

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