KR-102961384-B1 - Tensile test device for ultra-low temperature

Abstract

The ultra-ultra-low temperature tensile testing device according to the present invention grips the entire upper and lower portions of the specimen, thereby having the effect of enabling tensile testing to be performed despite deformation of the specimen and the device in an ultra-low temperature environment.

Inventors

• 김현중
• 백두영
• 김경민

Assignees

• 서울대학교산학협력단

Dates

Publication Date

20260511

Application Date

20221025

Priority Date

20211026

Claims (6)

1. Chamber; Vertical movement device; and It includes a pair of fixing devices that are fastened to the vertical moving device so as to face each other, The above fixing device has a structure in which an upper plate and a lower plate are combined, and On the surface of the upper plate that contacts the lower plate, a space is formed to grip the specimen, and The above space includes a first section and a second section, wherein the first section becomes narrower in width as it moves toward the other fixing device facing it, and The second section of the above-mentioned top plate has a constant width, and the second section is connected to the wider side of the first section. On the lower plate, a shape corresponding to the space is formed in relief, and The depth of the above space is 20 to 70% of the thickness of the upper plate of the fixing device, and A tensile testing device for ultra-low temperature, characterized in that the thickness of the embossed shape of the lower plate is 30 to 60% of the total thickness of the lower plate of the fixing device.
2. In Article 1, A bolt fastening portion is formed on the upper plate, and A hole is formed in the lower plate above, and An ultra-low temperature tensile testing device in which a tightening bolt passes through the hole and is coupled to the bolt fastening part.
3. In Article 2, An ultra-low temperature tensile testing device having a spiral groove formed in the hole portion having a shape corresponding to the threaded portion of the tightening bolt.
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6. In Article 1, The upper plate of the above-mentioned fixing device further includes a bolt portion, and The above vertical movement device includes a bolt fastening part, and The above bolt part is an ultra-low temperature tensile testing device that is fastened to the bolt fastening part of a vertical movement device.

Description

Tensile test device for ultra-low temperature The present invention relates to a tensile testing device for measuring the tensile strength of a specimen. Generally, during product design, physical and mechanical properties such as strength and elongation are measured to select the material and dimensions suitable for the intended purpose and application. At this stage, the physical and mechanical properties of the material are measured through tensile testing using test specimens manufactured to the designed specifications. Tensile testing of such materials involves slowly stretching a specimen to measure its yield point, yield strength, tensile strength, yield elongation, fracture length, and cross-sectional shrinkage; various specimen fixing devices are used depending on the type of specimen or the properties of the material. FIG. 1 is a perspective view of a tensile testing device according to the present invention. FIG. 2 is a perspective view of the top plate of a fixing device according to the present invention. FIG. 3 is a front view of the top plate of a fixing device according to the present invention. FIG. 4 is a perspective view of the lower plate of a fixing device according to the present invention. FIG. 5 is a perspective view of a fixing device having an upper plate and a lower plate combined according to the present invention. The present invention is capable of various modifications and may have various embodiments, and specific embodiments are to be described in detail. However, this is not intended to limit the invention to the contents of specific embodiments, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the technical spirit and scope of the invention. In the present invention, terms such as "comprising" or "having" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not excluding in advance the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Furthermore, in the present invention, when a part such as a layer, film, region, or plate is described as being "on" another part, this includes not only cases where it is "immediately above" the other part, but also cases where there is another part in between. Conversely, when a part such as a layer, film, region, or plate is described as being "under" another part, this includes not only cases where it is "immediately below" the other part, but also cases where there is another part in between. Additionally, in the present application, being "placed on" may include cases where it is placed on the lower part as well as on the upper part. The present invention provides a tensile testing device for ultra-low temperature capable of performing tensile testing in an ultra-low temperature environment. In one example, the apparatus comprises a chamber; a vertical moving device; and a pair of fixing devices connected to the vertical moving device so as to face each other, wherein the fixing device has a structure in which an upper plate and a lower plate are joined, and a space is formed on the surface of the upper plate that contacts the lower plate, in which a specimen can be gripped, and the space includes a first section that becomes narrower in width toward the other fixing device facing it. In particular, the ultra-cryogenic tensile testing device according to the present invention has the advantage of being able to perform a tensile test on a specimen normally without causing deformation of the device or impact to the specimen in a harsh environment of about -200 to -260°C, preferably about -253°C. Hereinafter, a tensile testing device for ultra-low temperatures according to the present invention will be described in detail with reference to the drawings. Ultra-low temperature tensile testing device FIG. 1 is a perspective view of a tensile testing device according to the present invention. The ultra-ultra-low temperature tensile testing device (10) according to the present invention includes a chamber (11), a vertical moving device (12), and a pair of fixing devices installed to face each other vertically. At this time, the chamber is a cooling device that provides an ultra-low temperature environment when a tensile test is performed on a specimen, and can maintain a low temperature state using liquid nitrogen or liquid helium. The above fixing device is formed with a structure in which an upper plate (20) and a lower plate (30) are combined. After fixing the specimen to the fixing device, when the tensile test begins, the fixing devices installed facing each other vertically move slowly in a direction away from each other by means of a vertical movement device to measure the tensile strength of the specimen. The ultra-ultra-low temperature tensile testing device according to the