KR20140038102A - Test apparatus for pure shear strength test - Google Patents

Test apparatus for pure shear strength test Download PDF

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Publication number
KR20140038102A
KR20140038102A KR1020120104385A KR20120104385A KR20140038102A KR 20140038102 A KR20140038102 A KR 20140038102A KR 1020120104385 A KR1020120104385 A KR 1020120104385A KR 20120104385 A KR20120104385 A KR 20120104385A KR 20140038102 A KR20140038102 A KR 20140038102A
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KR
South Korea
Prior art keywords
upper support
test
support
restraint
hinge
Prior art date
Application number
KR1020120104385A
Other languages
Korean (ko)
Inventor
황경민
박동수
Original Assignee
한국전력공사
한국수력원자력 주식회사
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Application filed by 한국전력공사, 한국수력원자력 주식회사 filed Critical 한국전력공사
Priority to KR1020120104385A priority Critical patent/KR20140038102A/en
Publication of KR20140038102A publication Critical patent/KR20140038102A/en

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    • 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
    • G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing 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
    • G01N2203/0025—Shearing
    • 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
    • G01N2203/0441—Chucks, fixtures, jaws, holders or anvils with dampers or shock absorbing means

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The present invention relates to a pure shear test apparatus comprising: a support unit which supports a test specimen which is an object of shear force test; and a movement restraining unit connected to the support unit to prevent bending moment from occurring on the test specimen when applying a shear force on the test specimen. According to a pure shear test apparatus of an embodiment of the present invention, there is an effect in achieving a pure shear load which does not occur bending moment.

Description

Pure Shear Tester {TEST APPARATUS FOR PURE SHEAR STRENGTH TEST}

The present invention relates to a pure shear test apparatus, and more particularly to a pure shear test apparatus for measuring the pure shear force by preventing the bending moment acting on the test body.

1 and 2, in order to check the shear strength of the large structure through a test to simulate the target structure in the form of a web and to form the side support portion 13 on both sides and the upper support portion 11 for the load force and The method of designing the lower support part 12 is mainly used.

When the test is performed through this method, there is an advantage of preventing the distortion transmitted to the test body by the side support part 13 when the load is applied and easily transmitting the shear force to the test body through the upper support part 11.

However, when the load acting on the test body 10 by this test method is analyzed through the concrete surface crack, as shown in FIG. 2 (b), not only the shear crack but also the flexural crack is generated and thus the pure shear load cannot be realized. There was this.

The present invention has been proposed to solve at least some of the conventional problems, and its object is to provide a pure shear test apparatus that can obtain a pure shear load that can minimize the generation of the bending moment in the test body .

Technical aspect in order to achieve the above object, the present invention, the support for supporting a test target subject to the shear force test; It provides a pure shear test apparatus comprising a; and a moving restraint portion connected to the support so that bending moment (bending moment) does not occur in the test body when applying a shear force to the test body.

 Preferably, the support includes an upper support connected to the top of the test body; And a lower support part connected to the lower end of the test body.

Also preferably, the support may further include a side support for supporting the upper support.

Preferably, the upper support includes a first upper support connected to the upper end of the test body; And a second upper support part provided at an upper portion of the first upper support part and provided at an upper end of the roller part.

Preferably, the movement restraint portion is a constraint body for supporting the upper support; And a hinge portion hinged to the support portion and the constraint body.

In addition, preferably, the hinge portion may include an upper hinge portion that hinges the support portion and the restrainer body to move the upper support portion in a horizontal direction.

Preferably, the hinge portion may include a lower hinge portion installed on the lower portion of the constraint body so that the constraint body is hinged.

More preferably, the movement restraint portion may further include a damping portion that cancels the compressive force in the vertical direction.

Also preferably, the movement restraint portion may include a height adjuster for adjusting the height of the restraint body.

Preferably, the movement restraint part may include an elastic part capable of canceling the vertical compressive force applied to the restraint body or adjusting the height of the side support part.

According to the pure shear test apparatus according to one embodiment of the present invention as described above, the bending moment is prevented from occurring in the test body, thereby providing an effect of obtaining a pure shear force.

1 is a photograph showing a conventional shear test apparatus.
Fig. 2 is a schematic view of a conventional shear test apparatus, wherein (a) is a schematic view immediately before the application of force, and (b) is a schematic view showing that a bending moment is generated in a state in which the application is performed.
3 is a front view of a pure shear testing apparatus according to an embodiment of the present invention.
4 is a front view of a pure shear testing apparatus according to another embodiment of the present invention.
5 (a) and 5 (b) are a partial perspective view of the movement restraint according to an embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail with reference to the accompanying drawings.

First, the embodiments described below are suitable examples for understanding the technical features of the pure shear test apparatus of the present invention. It should be understood, however, that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Referring to FIG. 3, the pure shear test apparatus 100 according to an exemplary embodiment of the present invention has a support 110 supporting a test body 10 to be subjected to a shear force test, and a shear force is applied to the test body 10. The test body 10 may be provided with a moving constraint 120 connected to the support 110 so that a bending moment is not generated.

First, the support part 110 may include an upper support part 111 connected to the upper end of the test body 10 and a lower support part 112 connected to the lower end of the test body 10. The upper support part 111 and the The test body 10 is provided between the lower supports 112.

In this case, the test body 10 is fixed to the upper support part 111 and the lower support part 112, and the shear force of the test body 10 is tested when a horizontal load is applied to the upper support part 111.

In addition, side support parts 113 may be provided on both side surfaces of the test body 10. The side support part 113 is connected to the upper support part 111 and the lower support part 112, and when the external force P in the horizontal direction is applied to the upper support part 111, the test body 10 is connected to the upper support part ( Even when not fixed to the 111 and the lower support 112, the test body 10 may receive a force from the side support 113 to measure the shear force.

In addition, the movement restraint part 120 includes a hinge part 121 for supporting the upper support part 111 and a hinge part 122 for hinge coupling of the upper support part 111 and the restrainer body 121. It may be configured to include.

Referring to FIG. 3, the upper part of the restrainer body 121 is connected to the upper support part 111. The upper support part 111 moves in a horizontal direction to prevent the bending moment from occurring. And hinges 110).

At this time, the hinge portion 122 is an upper hinge portion 122a to which the upper support portion 111 and the restrainer body 121 are hinged, and a lower hinge portion installed below the restraint body 121. And 122b.

First, the hinge part 122 may adjust the rotation angles on both sides of the rotating part to prevent the upper support part 111 from moving excessively in the horizontal direction when applying the force to the upper support part 111. An angle adjusting unit 127 may be further provided.

When the hinge portion 122 rotates a predetermined angle, the angle adjusting part 127 comes into contact with a rotating portion having a semicircular shape on the inclined surface provided on the upper portion of the angle adjusting part 127. ) Can no longer be moved horizontally and stop. However, the configuration of the angle adjusting unit 127 is not limited to the embodiment illustrated in FIG. 3, and other known configurations may be employed as long as the angle of rotation of the hinge 122 may be limited.

On the other hand, the lower hinge portion 122b is hinged to the bottom surface and the restraint body 121 to the lower portion of the restrainer body 121, or the lower support portion 122b and the restraint body 121 is It may be provided to hinge.

In addition, the restrainer body 121 may further include a damping part 123 to cancel the compressive force in the vertical direction.

The test body 10 and the movement restraint 120 are hingedly coupled to the upper support 111 and the restraint body 121.

Therefore, when an external force P is applied in the horizontal direction from the side of the upper support part 111, the upper support part 111 moves in the horizontal direction while the movement restraint part 120 forms a constant angle with the ground and is in the vertical direction. Will also receive compression.

At this time, when the external force P is large, the damping part 123 is provided to prevent excessive compressive force from occurring in the test body 10 and the movement restraint part 120.

The damping part 123 may be provided as a hydraulic piston. When hydraulic pressure is applied from the hydraulic piston, tensile force may be generated on the restrainer body 121 to reduce the compressive force acting on the test body 10.

However, the hydraulic piston is only one example for preventing the excessive compression force from acting on the test body 10 and the movement restraint unit 120, and various embodiments capable of releasing the excessive compression force are possible.

In addition, the load restraining unit 120 is provided with a load cell 124, the test body 10 is subjected to a shear test while receiving a compressive force or a numerical value of the compressive force by the load cell 124 when maintaining a constant compressive force during the test You can proceed with the test while checking.

 Referring to FIG. 5, the movement restraint 120 according to the exemplary embodiment of the present invention may include a height adjuster 128 through which the height of the restraint body 121 may be adjusted.

The height adjustment unit 128, as shown as an example in Figure 5 (a), to form a screw thread on the restrainer body 121 to rotate the restrainer body 121 to the restraint by the screw thread It may be provided so that the height of the sub-body 121 can be adjusted.

However, the thread is formed is only one embodiment and may be implemented in various embodiments.

Therefore, the shearing force can be measured even with respect to the test body 10 having various heights without being limited to the height of the test body 10 by the height adjusting unit 128.

And, as shown in Figure 5 (b), the movement restraint 120 according to an embodiment of the present invention may be provided with an elastic member 126 inside the restrainer body 121, the elastic The member 126 not only prevents the restraint body 121 from being subjected to excessive compressive force, but also adjusts the length of the restraint body 121.

That is, the elastic member 126 is inserted into the restrainer body 121, and the compressive force acts on the movement restraint part 120 by connecting the restraint body 121 with the connection member 125. In this case, the excessive compressive force may be prevented by the elastic member 126. At this time, the connection member 125 may be coupled in a known coupling manner such as the restraint body 121 and the screw coupling.

Therefore, the length of the restraint body 121 is elastically adjusted so that the pure shear force can be measured even with respect to the test body 10 having various heights regardless of the height of the test body 10.

On the other hand, referring to Figure 4, in another embodiment of the present invention may be provided with a roller portion 130 on the upper support 111.

The upper support part 111 is provided to include a first upper support part 111a and a second upper support part 111b so that the roller part 130 is provided on the upper support part 111. The roller part 130 may be provided between the 111a) and the second upper support part 111b.

Here, the roller portion 130 is provided with a plurality of rollers are connected to the second upper support portion is provided so that the roller in contact with the upper surface of the first upper support portion.

The roller unit 130 horizontally moves the first upper support part 111a together with the hinge part 122 when an external force P is applied to the first upper support part 111a so that the bending moment So that only the pure shear force of the test body 10 can be measured.

Hereinafter, the effect of the pure shear test apparatus according to an embodiment of the present invention will be described in detail.

A test body 10 to be subjected to a shear force test is installed between the upper support part 111 and the lower support part 112, and an external force P is applied to the upper support part 111 in a horizontal direction.

When the external force P is applied in the horizontal direction, the upper support part 111 is moved in the horizontal direction. At this time, the upper support part 111 is bent by the upper hinge part 122a provided in the upper support part 111. The moment does not work and moves only in the horizontal direction.

At this time, the hinge portion 122 is provided with an angle adjusting portion 127 is limited to move so that the upper support portion 111 moves by a predetermined distance when moving in the horizontal direction.

As a result, the upper support part 111 is prevented from moving excessively in the horizontal direction by an external force P, and when the roller part 130 is provided in the upper support part 111, the upper support part 111 is The upper support part 111 is moved in the horizontal direction without limiting the movement of the roller part 130 from the first upper support part 111a.

When the external force P is applied, the compressive force acts on the test body 10 in proportion to the size of the external force P. When the external force P is large, an excessive compressive force other than the shear force is applied to the test body 10 when the external force P is large. ) Is applied.

However, the movement restraint part 120 is provided with the damping part 123 to prevent the test body 10 from being damaged due to excessive compressive force.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims It will be appreciated that those skilled in the art will readily understand the present invention.

10: Test body 100: Pure shear test apparatus
110: support part 111: upper support part
111a: first upper support 111b: second upper support
112: lower support portion 113: side support portion
120: moving restricting portion 121: restricting portion body
122: hinge portion 122a: upper hinge portion
122b: lower hinge portion 123: damping portion
124: load cell 125: connecting member
126: elastic member 127:
128: height adjusting section 130: roller section

Claims (10)

A support part for supporting a test object to be subjected to a shear force test; And
And a movable restraining part connected to the supporting part so as to prevent a bending moment from being generated in the specimen when a shearing force is applied to the specimen. 2. The apparatus of claim 1,
An upper support connected to the upper end of the test body; And
Pure shear test apparatus comprising a; lower support portion connected to the lower end of the test body. 3. The apparatus of claim 2, wherein the support
Pure shear test apparatus, characterized in that it further comprises; a side support for supporting the upper support. 2. The apparatus of claim 1, wherein the upper support
A first upper support part connected to an upper end of the test object; And
Pure water shear test apparatus comprising a; a roller portion is provided on the upper portion of the first upper support portion, the second upper support portion provided on the upper end of the roller portion. 5. The movement restraint of claim 2 or 4, wherein the movement restraint part
Constrainer body for supporting the support; And
Pure shear test apparatus comprising a; hinge portion hinged to the support portion and the restraint body. 6. The method of claim 5,
And the hinge portion includes an upper hinge portion for hinge-connecting the upper support portion and the restraining portion body to move the upper support portion in a horizontal direction. The method according to claim 6,
And a lower hinge portion provided at a lower portion of the restricting portion body so that the hinge portion hinges on the restricting portion body. 6. The method of claim 5,
The moving restraint unit further comprises a damping unit for canceling the compressive force in the vertical direction. 6. The method of claim 5,
Wherein the movement restraining part comprises a height adjusting part capable of adjusting a height of the restraining part body. 6. The method of claim 5,
Wherein the movable restraining portion comprises an elastic member capable of canceling a vertical compressive force applied to the restraining body or adjusting a height of the side supporting portion.
KR1020120104385A 2012-09-20 2012-09-20 Test apparatus for pure shear strength test KR20140038102A (en)

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Application Number Priority Date Filing Date Title
KR1020120104385A KR20140038102A (en) 2012-09-20 2012-09-20 Test apparatus for pure shear strength test

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Application Number Priority Date Filing Date Title
KR1020120104385A KR20140038102A (en) 2012-09-20 2012-09-20 Test apparatus for pure shear strength test

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KR20140038102A true KR20140038102A (en) 2014-03-28

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160079432A (en) * 2014-12-26 2016-07-06 경북대학교 산학협력단 Apparatus for experimenting structural mechanics
KR101721775B1 (en) * 2015-10-23 2017-03-30 조선대학교산학협력단 Pure shear test device
CN109752243A (en) * 2019-03-15 2019-05-14 河南交通职业技术学院 A kind of pressure-shear test machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160079432A (en) * 2014-12-26 2016-07-06 경북대학교 산학협력단 Apparatus for experimenting structural mechanics
KR101721775B1 (en) * 2015-10-23 2017-03-30 조선대학교산학협력단 Pure shear test device
CN109752243A (en) * 2019-03-15 2019-05-14 河南交通职业技术学院 A kind of pressure-shear test machine
CN109752243B (en) * 2019-03-15 2020-09-25 河南交通职业技术学院 Compression-shear testing machine

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