KR20170055829A - Holder for tensile test - Google Patents

Holder for tensile test Download PDF

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Publication number
KR20170055829A
KR20170055829A KR1020150159102A KR20150159102A KR20170055829A KR 20170055829 A KR20170055829 A KR 20170055829A KR 1020150159102 A KR1020150159102 A KR 1020150159102A KR 20150159102 A KR20150159102 A KR 20150159102A KR 20170055829 A KR20170055829 A KR 20170055829A
Authority
KR
South Korea
Prior art keywords
specimen
holder
grip
detachable wedge
wedge grip
Prior art date
Application number
KR1020150159102A
Other languages
Korean (ko)
Inventor
김석봉
Original Assignee
국방과학연구소
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 국방과학연구소 filed Critical 국방과학연구소
Priority to KR1020150159102A priority Critical patent/KR20170055829A/en
Publication of KR20170055829A publication Critical patent/KR20170055829A/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/04—Chucks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B2/00—Friction-grip releasable fastenings
    • F16B2/02—Clamps, i.e. with gripping action effected by positive means other than the inherent resistance to deformation of the material of the fastening
    • F16B2/14—Clamps, i.e. with gripping action effected by positive means other than the inherent resistance to deformation of the material of the fastening using wedges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0017—Tensile
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/026—Specifications of the specimen
    • G01N2203/0262—Shape of the specimen
    • G01N2203/0278—Thin specimens
    • G01N2203/028—One dimensional, e.g. filaments, wires, ropes or cables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/04—Chucks, fixtures, jaws, holders or anvils
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/04—Chucks, fixtures, jaws, holders or anvils
    • G01N2203/0423—Chucks, fixtures, jaws, holders or anvils using screws

Abstract

The present invention relates to a detachable wedge grip formed to surround an outer circumferential surface of a specimen at one side of a specimen and fixed to the specimen and formed to increase in thickness toward one end of the specimen; A grip holder having a cylindrical shape and having a screw engagement portion on an inner surface thereof and having a shape of an inner surface corresponding to the detachable wedge grip such that the detachable wedge grip is inserted and closely contacted; And a holder pin extending to one side and coupled to the grip holder through a screw fastening portion protruding outwardly, and receiving a tensile force and transmitting the tensile force to the specimen.

Description

Holder for tensile test {HOLDER FOR TENSILE TEST}

The present invention relates to a holder for supporting a specimen necessary for performing a tensile test.

A tensile test apparatus generally used is a system in which both ends of a specimen are fixed by using a physical force. When the tensile force exceeds the force for fixing the specimen or the tensile force is applied at high speed, the specimen may be broken and the test can not be performed. Therefore, there is a growing demand for holders to support specimens whose tensile force increases as the force to hold the specimen increases. In the international standards related to the brittle material tensile test, it is recommended to fix both ends of the specimen with a bonding agent, but in this case, the bonding agent may be broken during the stretching process and it is difficult to uniformly apply the bonding agent.

Recently, with regard to the brittle material grip device, a method is used in which a groove is formed in the test device to process and assemble the specimen to the groove shape or to attach the rough material to the grip face so that slip does not occur. However, in this case, there is a problem that fracture occurs at the joint portion between the specimen and the groove, or tensile test is possible only for a specific specimen shape. Therefore, even if a large tensile force is applied to the specimen, there is an increasing need for a holder for supporting the specimen so that the tensile test can be performed without breaking the specimen.

The present invention is to propose a new structure for a holder that supports a specimen in performing a tensile test.

The present invention is intended to propose a structure for a holder capable of supporting a specimen without breaking the specimen during the tensile test.

A holder for a tensile test according to an embodiment of the present invention for realizing the above object is formed so as to surround the outer circumferential surface of the specimen at one side of the specimen and is fixed to the specimen, A grip holder having a cylindrical shape and a screw engagement portion on an inner surface thereof and having a shape of an inner surface corresponding to the detachable wedge grip such that the detachable wedge grip is inserted and adhered to the grip holder; And a holder pin extending to the one side and coupled to the grip holder through a threaded fastening portion protruding outwardly, and transmitting the tensile force to the specimen.

According to one embodiment of the present invention, the detachable wedge grip includes a first portion extending along the outer circumferential surface of the specimen at the upper portion of the specimen and having a shape wrapping the specimen; And a second portion extending along the outer circumferential surface of the specimen at a lower portion of the specimen and surrounding the specimen, wherein the first portion and the second portion are arranged to face each other with respect to the specimen.

At this time, the first portion and the second portion may be formed separately.

The first portion and the second portion may be spaced from each other by a predetermined distance so that a portion of the specimen is exposed.

According to another embodiment of the present invention, the detachable wedge grip includes an anti-slip part on the inner circumferential surface to prevent sliding from the specimen due to an externally applied tensile force.

According to another embodiment of the present invention, when the specimen is a rod, the detachable wedge grip may have a shape of an inner circumferential surface so as to surround the rod specimen, and when the specimen is a plate shape, And has a shape of an inner peripheral surface so as to surround a specimen of a plate shape.

According to another embodiment of the present invention, the thickness of the grip holder increases in a direction in which the detachable wedge grip is inserted.

According to another embodiment of the present invention, the holder pin includes an annular portion protruding in a direction to be disposed on one side of the holder pin so as to be transmitted to the specimen with a tensile force applied thereto, And is connected to a tensile force providing device.

According to the present invention as described above, the specimen used in the tensile test can be supported on the specimen using the detachable wedge grip.

 According to the present invention having the above-described structure, the specimen can be supported without breaking the specimen even when the tensile force is high or the tensile test is performed at high speed by the action of the detachable wedge grip and the grip holder.

1 is a perspective view of a holder for a tensile test.
2 (a) is a perspective view showing a detachable wedge grip;
Figure 2 (b) is a perspective view showing a first portion of the detachable wedge grip.
Figure 2 (c) is a side view of the first portion of the detachable wedge grip.
Figure 3 (a) is a perspective view of a detachable wedge grip including a non-slip portion.
FIG. 3 (b) is a perspective view showing a first portion of a detachable wedge grip including a non-slip portion. FIG.
Figure 3 (c) is a side view of the first part of the detachable wedge grip including the anti-slip part.
4 (a) is a perspective view of the grip holder.
4 (b) is a cross-sectional view cut along the line A-A 'in FIG. 4 (a).
FIG. 5 (a) is a perspective view showing a detachable wedge grip and a grip holder coupled to a specimen. FIG.
FIG. 5B is an exploded view of FIG. 5A. FIG.
6 (a) is a perspective view of the holder pin.
6 (b) is a side view of the holder pin.
7 is a perspective view showing a device for performing a tensile test on a plate-shaped specimen.
8 is another embodiment of a detachable wedge grip that supports a plate-shaped specimen.

Hereinafter, a tensile test holder according to the present invention will be described in more detail with reference to the drawings.

In the present specification, the same or similar reference numerals are given to different embodiments in the same or similar configurations. As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

A tensile test is a test to determine the mechanical properties of a specimen by applying a tensile force to the specimen. Mechanical properties mean the yield point, the proof stress, the tensile strength, the proportional limit, the elastic limit, the elongation and contraction, the elastic modulus, and the Young's modulus. The tensile test apparatus is used to evaluate the properties of specimens by placing a specimen and applying a tensile force in a certain direction. A specimen is an object to be tested for analysis. In this specification, a specimen means a rod specimen and a plate specimen as a target to be subjected to a tensile test.

In order to perform a tensile test on a specimen, a tensile test holder is required to transfer the tensile force to the specimen from the specimen, the tensile force providing apparatus and the tensile force providing apparatus to be tested. The holders for tensile testing serve to support the specimen.

1 is a perspective view showing a state in which a tensile test holder 100 is coupled to a test piece 10.

The tensile test holder 100 is a device for supporting a test piece 10 and applying a tensile force to the test piece 10. [ The tensile test holder 100 includes a detachable wedge grip 110, a grip holder 120, and a holder pin 130.

1 shows a state in which a detachable wedge grip 110 is inserted into a bar-shaped specimen 10 and a specimen 10 coupled with a detachable wedge grip 110 is inserted into the grip holder 120. Fig. The screw fastening portion 121 provided on the inner peripheral surface 122 of the grip holder 120 is engaged with the screw fastening portion 131 of the holder pin 130 so that the grip holder 120 is engaged with the holder pin 130, .

When the respective constitutions of the tensile test holder 100 are coupled to the specimen 10 to be subjected to the tensile test, the tensile force providing apparatus is connected to the annular portion 133 of the holder pin 130 exposed to both sides as shown in Fig. It is possible to apply a tensile force to the base 10. Therefore, it becomes possible to perform a tensile test on the specimen 10.

Figure 2 is a perspective view of a detachable wedge grip 110, Figure 2 (a) is a perspective view showing detachable wedge grip 110, Figure 2 (b) is a perspective view of detachable wedge grip 110, And FIG. 2 (c) is a side view of the first portion of the detachable wedge grip 110. As shown in FIG.

Referring to the structure of the detachable wedge grip 110, the detached wedge grip 110 has an inner surface corresponding to the shape of the specimen 10 so as to be able to receive and wrap the specimen 10. For example, when the specimen 10 is a bar, the detachable wedge grip 110 may be configured to receive the bar specimen 10 to support the specimen 10 at the top and bottom of the specimen 10 The above-mentioned specimen 10 can be received. When the specimen 10 is in the form of a plate, the detachable wedge grip 110 has an inner surface capable of accommodating the plate-shaped specimen 10 to support the upper and lower portions of the plate-like specimen 10, And the specimen 10 is accommodated in the inner side.

As shown in FIG. 2 (a), the detachable wedge grip 110 includes a first portion 111 and a second portion 112. The reason for designating the detachable wedge grip 110 is that it is separable into the first portion 111 and the second portion 112. [ The first portion 111 and the second portion 112 have a structure for supporting the upper and lower portions of the specimen 10 and are arranged to face each other with respect to the specimen 10 and are separable from each other.

The first portion 111 has a shape extending from the upper side of the specimen 10 along the outer circumferential surface of the specimen 10 so as to surround the specimen 10 and the second portion 112 has the shape of the specimen 10, And extends around the outer circumferential surface (not shown) of the specimen 10 at a lower portion of the specimen 10 so as to surround the specimen 10.

The first portion 111 and the second portion 112 are spaced apart from each other by a predetermined distance so that a portion of the specimen 10 is exposed so that when a tensile force is applied, Since the load is transmitted to the detachable wedge grip 110 by the holder 120, the first portion 111 and the second portion 112 are positioned so as to be separated from each other by a certain distance. Therefore, when the first part 111 and the second part 112 are viewed from the outside, the part of the test piece 10 will be exposed.

The detachable wedge grip 110 has a shape increasing in thickness toward one end of the test piece 10. When the separable wedge grip 110 is viewed from the side, it becomes a trapezoidal shape as shown in FIG. 2 (c).

Since the detachable wedge grip 110 is inserted and positioned in the grip holder 120, the detached wedge grip 110 and the grip holder 120 are in contact with each other, so that the interface 115 is generated.

A force is exerted on the formed interface 115 by an externally applied tensile force. The detachable wedge grip 110 and the grip holder 120 are subjected to forces in opposite directions with respect to the interface 115. As the force applied increases, the grip holder 120 moves toward the specimen of the detachable wedge grip 110 10 is also increased. As the tensile force applied to the grip holder 120 increases, the inner circumferential surface 122 of the grip holder 120 presses the specimen 10 with a stronger force with respect to the interface 115. Therefore, the detachable wedge grip 110 and the specimen 10 are more closely adhered to support the specimen 10. The tensile force applied is such that the interface 115 generated by the separate wedge grip 110 and the grip holder 120 is projected onto the specimen 10 and is uniformly applied to the specimen 10 by the length projected onto the specimen 10 Respectively.

Therefore, the present invention can more firmly hold the test piece 10 even when a large tensile force is applied to the test piece 10 or a tensile test is performed at high speed, and the test piece 10 can be held evenly by a force dispersed evenly on the test piece 10, So that it is possible to prevent the breakage from occurring.

3 (a), 3 (b) and 3 (c) show the shape of the detachable wedge grip 110 including the non-slip part 113. [

The detachable wedge grip 110 may include a non-slip part 113 on the inner circumferential surfaces 111a and 112b to prevent the specimen 10 from slipping due to a tensile force externally applied thereto. The non-slip part 113 can be made in various shapes and materials to further increase the gripping force of the detachable wedge grip 110. [ The non-slip portion 113 may be made of a material capable of increasing the frictional force corresponding to the specimen 10. For example, the detachable wedge grip 110 can be positioned such that the non-slip portion 113 is positioned on the inner circumferential surfaces 111a and 112b surrounding the specimen 10 when the specimen 10 is a rod . If the test piece 10 is plate-shaped, the non-slip portion 113 may be positioned on the inner circumferential surface (not shown) so as to surround the plate-shaped test piece 10.

4 (a) is a perspective view showing the grip holder 120, and FIG. 4 (b) is a sectional view of the grip holder 120 shown in FIG. 4 (a) taken along the line A-A '.

The grip holder 120 has a shape in which the detachable wedge grip 110 can be inserted corresponding to the shape of the detachable wedge grip 110. [ The grip holder 120 may be made of metal, but the material thereof is not limited.

4 (a) and 4 (b), the grip holder 120 has a cylindrical shape and has a structure in which the detachable wedge grip 110 can be inserted and closely contacted. Specifically, the inner surface of the grip holder 120 has a shape corresponding to the detachable wedge grip 110. When the detachable wedge grip 110 is inserted into the grip holder 120, the detached wedge grip 110 and the grip holder 120 are engaged with each other through the interface 115, The specimen 10 can be prevented from being broken or slipped by the detachable wedge grip 110 and the grip holder 120 even when a large tensile force is applied through the tensile test.

A screw coupling part 121 is located on one side of the inner side surface of the grip holder 120 of the grip holder 120. The screw fastening portion 121 of the grip holder 120 is fixed to the screw fastening portion 131 of the holder pin 130 by screwing. The screw coupling serves to prevent the grip holder 120 and the holder pin 130 from being separated from each other by a tensile force applied to the hook 133 of the holder pin 130.

4 (b), the thickness of the grip holder 120 increases in a direction in which the detachable wedge grip 110 is inserted, and the detachable wedge grip 110 ) Are inserted and brought into close contact with each other.

5 (a) shows a detachable wedge grip 110 and a grip holder 120 coupled to the specimen 10. 5 (a), a detachable wedge grip 110 is placed on one side of the specimen 10 and fixed to the specimen 10, and an inner shape corresponding to the outer shape of the detachable wedge grip 110 The detachable wedge grip 110 is inserted into the grip holder 120. [ The inserted detachable wedge grip 110 is firmly supported by the grip holder 120. Fig. 5 (b) shows an exploded view of Fig. 5 (a).

Figures 6 (a) and 6 (b) show the shape of the holder pin 130.

The holder pin 130 is coupled to the grip holder 120 by screw tightening and receives a tensile force by the tensile force applying device through the hook 133 located on one side. A projecting screw fastening portion 131 is located on one side of the holder pin and the screw fastening portion 131 of the protruded holder pin is inserted into the grip holder 120, (120) to the screw coupling part (121).

On the opposite side of the holder pin 130 where the screw coupling part 131 is located, a hook 133 connected to the tensile force applying device to receive the tensile force is positioned. The hook 133 extends from the body of the holder pin 130 and has protrusions extending upward and downward in directions away from each other. In FIG. 6, the shape of the hook 133 of the holder pin 130 is merely an example, and the structure of the hook 133 may be changed as long as it is connected to the tensile force providing device and can transmit tensile force.

The case where the specimen 10 to be subjected to the tensile test is formed as a rod has been described above. Hereinafter, a case in which the specimen 10 has a plate shape will be described.

Fig. 7 is a view showing a device for tensile test on a plate-shaped specimen 10, and Fig. 8 shows a detachable wedge grip 210 supporting a plate-shaped specimen 10. Fig.

The present invention relates to a holder capable of supporting a specimen (10) having a plate shape. A tensile test holder 200 for a plate-shaped specimen 10 includes a detachable wedge grip 210, a grip holder 220, and a holder pin 230.

In the case of a specimen 10 having a plate shape, the detachable wedge grip 210 supports and supports both ends of the specimen 10 made of a plate. Unlike the structure of the detachable wedge grip 110 for the rod-shaped specimen 10 described above, the structure of the detachable wedge grip for the plate-shaped specimen 10 is similar to that of the specimen 10 ). ≪ / RTI >

The detachable wedge grip has an inner surface capable of receiving the plate-shaped specimen 10 to support the upper and lower portions of the plate-shaped specimen 10, and the plate-shaped specimen 10 is accommodated on the inner surface thereof . However, the detachable wedge grip 210 for the plate-shaped specimen 10 likewise has a shape increasing in thickness toward one end of the specimen 10. The detachable wedge grip 210, which is intended for a two-part detachable plate-shaped specimen 10, forms an interface formed by being inserted into the grip holder 220. The detachable wedge grip 210 and the grip holder 220 are subjected to forces opposite to each other so that the grip holder 220 moves the detachable wedge grip 210 toward the specimen 10 ) Is also increased. As a result, as in the above-described effects, the tensile force is increased while preventing the specimen 10 from being broken, and the test piece 10 is firmly supported even when the tensile test is performed at high speed.

The tensile test holders 100 and 200 described above are fixed to both ends of the test piece 10 so as to apply tensile force to both sides of the test piece 10. As shown in FIG. 1, the detachable wedge grip 210, The holder 220 and the holder pin 230 may be combined and disposed at both ends of the left and right sides of the test piece 10.

The above described tensile test holder is not limited to the configuration and the method of the embodiments described above, but the embodiments may be configured by selectively combining all or a part of each embodiment so that various modifications can be made.

10: The Psalms
100: Holder for tensile test
110: detachable wedge grip
113: Non-slip portion
120: grip holder
130: Holder pin

Claims (8)

A detachable wedge grip formed to surround an outer circumferential surface of the specimen at one side of the specimen and fixed to the specimen, the thickness of the detachable wedge grip being increased toward one end of the specimen;
A grip holder having a cylindrical shape and having a screw engagement portion on an inner surface thereof and having a shape of an inner surface corresponding to the detachable wedge grip such that the detachable wedge grip is inserted and closely contacted; And
And a holder pin extending to the one side and coupled to the grip holder through a screw fastening portion protruding outwardly, and receiving the tensile force and transmitting the tensile force to the specimen. The method according to claim 1,
The detachable wedge grip
A first portion extending along the outer circumferential surface of the specimen at the upper portion of the specimen and having a shape to enclose the specimen; And
And a second portion extending from the lower portion of the specimen and extending along the outer circumferential surface of the specimen to surround the specimen,
Wherein the first portion and the second portion are disposed to face each other with reference to the specimen. 3. The method of claim 2,
Wherein the first portion and the second portion are each configured to be removable. 3. The method of claim 2,
Wherein the first portion and the second portion are spaced apart from each other by a predetermined distance such that a portion of the specimen is exposed. The method according to claim 1,
The detachable wedge grip
And a non-slip portion on an inner circumferential surface of the holder in order to prevent slippage from the specimen due to a tensile force applied from the outside. The method according to claim 1,
The detachable wedge grip
Wherein when the test piece is a bar, the test piece has a shape of an inner circumferential surface so as to surround the test piece,
Wherein when the specimen is in the form of a plate, the holder has a shape of an inner circumferential surface so as to surround the specimen of the plate shape. The method according to claim 1,
Wherein the grip holder increases in thickness in a direction in which the detachable wedge grip is inserted. The method according to claim 1,
The holder pin
And an annular portion projecting to one side of the holder pin in a direction in which the holder pin is extended, the tensile force being applied to the specimen,
Wherein the holder is connected to the tensile force providing device through the loop.
KR1020150159102A 2015-11-12 2015-11-12 Holder for tensile test KR20170055829A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150159102A KR20170055829A (en) 2015-11-12 2015-11-12 Holder for tensile test

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Application Number Priority Date Filing Date Title
KR1020150159102A KR20170055829A (en) 2015-11-12 2015-11-12 Holder for tensile test

Publications (1)

Publication Number Publication Date
KR20170055829A true KR20170055829A (en) 2017-05-22

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KR1020150159102A KR20170055829A (en) 2015-11-12 2015-11-12 Holder for tensile test

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200066399A (en) * 2018-11-30 2020-06-10 한국생산기술연구원 Specimen Fixing Jig for Tensile Test
CN112255081A (en) * 2020-09-23 2021-01-22 安徽省力通稀土钢缆有限公司 A relaxation test device for steel strand wires

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200066399A (en) * 2018-11-30 2020-06-10 한국생산기술연구원 Specimen Fixing Jig for Tensile Test
CN112255081A (en) * 2020-09-23 2021-01-22 安徽省力通稀土钢缆有限公司 A relaxation test device for steel strand wires
CN112255081B (en) * 2020-09-23 2022-05-03 安徽省力通稀土钢缆有限公司 A relaxation test device for steel strand wires

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