KR101758508B1 - Apparatus for biaxial tention test - Google Patents

Apparatus for biaxial tention test Download PDF

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Publication number
KR101758508B1
KR101758508B1 KR1020150184046A KR20150184046A KR101758508B1 KR 101758508 B1 KR101758508 B1 KR 101758508B1 KR 1020150184046 A KR1020150184046 A KR 1020150184046A KR 20150184046 A KR20150184046 A KR 20150184046A KR 101758508 B1 KR101758508 B1 KR 101758508B1
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KR
South Korea
Prior art keywords
unit
driving
pressure
units
traction
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KR1020150184046A
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Korean (ko)
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KR20170075111A (en
Inventor
안강환
정양진
서민홍
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주식회사 포스코
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Priority to KR1020150184046A priority Critical patent/KR101758508B1/en
Publication of KR20170075111A publication Critical patent/KR20170075111A/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
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
    • 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
    • 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
    • G01N2203/003—Generation of the force
    • G01N2203/0042—Pneumatic or hydraulic means
    • 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
    • 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
    • G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes

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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

In order to accomplish the above object, a biaxial tensile testing apparatus according to an embodiment of the present invention includes four towing units for towing a specimen in two directions of two biaxial shafts; And driving force providing means for providing a traction force at the same or a predetermined ratio to the four traction units, wherein the driving force providing means is configured to distribute a hydraulic pressure or an air pressure to provide a traction force, One driving pressure providing unit; And a driving pressure distribution unit which connects the driving pressure providing unit and the traction unit and distributes the hydraulic pressure or air pressure provided from the driving pressure providing unit to the four traction units uniformly, , The four driving units are connected to each other, and the driving pressure channel is communicated with the driving pressure supply unit and connected to the driving unit. The driving pressure channel is communicated with the driving pressure supply unit part; And a branching unit branched from the communication unit and independently connected to the four towing units and distributing the hydraulic pressure or the air pressure provided from the driving pressure providing unit equally to the four towing units .

Description

[0001] APPARATUS FOR BIAXIAL TENTION TEST [0002]

The present invention relates to a biaxial tensile test apparatus and a biaxial tensile test apparatus capable of performing a biaxial tensile test on a specimen.

Since the metal plate is manufactured through the rolling process, the rolling direction and the vertical direction of the plate have different anisotropic properties.

In order to express the anisotropy of such a metal plate, a yield curve is mainly used. The anisotropy degree of the metal plate material can be expressed through the yield curve.

Especially, it is useful to simulate plastic deformation behavior of metal plate by modeling yield curve.

Here, since the biaxial tensile stress is frequently applied to the metal plate forming process, it is possible to accurately measure the biaxial tensile stress and to obtain more accurate prediction results when used in computer simulation.

At this time, in the yield curve, the data value at the axis tensile stress condition is very important because it determines the shape of the yield curve.

Specifically, the yield curve is a function of the stress ratio between two axes under biaxial loading. In the course of the experiment with biaxial tensile tester to obtain the yield curve, the force for tension is given by the same four drive units Or by adjusting the ratio to a certain value.

However, the biaxial tensile test apparatus according to the prior art measures the biaxial tensile properties of the specimen through the mechanism movement due to the mechanical structure, such as the press structure and the cam structure, (Or stress) ratios can not be accurately described because the constant deformation ratio can be realized not in a constant load ratio but in a constant load ratio.

Of course, when the material to be measured is an isotropic material, the load ratio and the corresponding deformation ratio are the same. In general, most of the materials have anisotropy. In anisotropic materials, the load ratio and the deformation ratio do not coincide with each other.

It is an object of the present invention to provide a biaxial tensile test apparatus which is provided to solve the above-mentioned problems and provides the same or a constant rate of traction for tensile tension.

According to an aspect of the present invention, there is provided a biaxial tensile testing apparatus including four traction units for traversing a specimen in two directions of two biaxial shafts; And driving force providing means for providing a traction force at the same or a predetermined ratio to the four traction units, wherein the driving force providing means is configured to distribute a hydraulic pressure or an air pressure to provide a traction force, One driving pressure providing unit; And a driving pressure distribution unit which connects the driving pressure providing unit and the traction unit and distributes the hydraulic pressure or air pressure provided from the driving pressure providing unit to the four traction units uniformly, , The four driving units are connected to each other, and the driving pressure channel is communicated with the driving pressure supply unit and connected to the driving unit. The driving pressure channel is communicated with the driving pressure supply unit part; And a branching unit branched from the communication unit and independently connected to the four towing units and distributing the hydraulic pressure or the air pressure supplied from the driving pressure providing unit equally to the four towing units .

In another embodiment, there are four traction units that pull the specimen in both directions of each of the two biaxial axes; And driving force providing means for providing a traction force at the same or a predetermined ratio to the four traction units, wherein the driving force providing means is configured to distribute a hydraulic pressure or an air pressure to provide a traction force, Two drive-pressure supply units for supplying the driving force to the drive source; And a driving pressure distribution unit which connects the driving pressure providing unit and the traction unit and distributes the hydraulic pressure or air pressure provided from the driving pressure providing unit to the four traction units uniformly, And the four driving units are connected to each other, and the driving pressure channel is communicated with the driving pressure providing unit and connected to the driving unit. The driving pressure channel is communicated with each driving pressure providing unit A communicating portion; And a plurality of branch portions branched from each of the communication portions and connected to the pulling unit, wherein one branch portion is connected to a pair of the pulling units for pulling the specimen in the uniaxial direction, and another branch portion is connected to the pulling unit To another pair of the tow units for towing in the other axis direction so that the branch portions can be mutually independent.

At this time, the traction unit includes a drive rod, one end of which is connected to the drive pressure distribution unit and reciprocates axially by hydraulic pressure or air pressure provided from the drive pressure supply unit; And a specimen grip part mounted on the other end of the driving rod to grip the specimen.

In addition, the driving pressure distribution unit may be disposed on the inner side of the four traction units on a plane.

At this time, the driving rod may include: a driving unit radially disposed from the driving pressure distribution unit; A driven part spaced apart from the driving part in a vertical direction and arranged in parallel with the driving part; And a link portion connecting the driving portion and the follower portion

In addition, the pulling unit may further include a guide member slidably coupled to the follower unit so as to guide the movement of the follower unit interlocked with the drive unit.

Furthermore, the pulling unit may further include a load cell disposed between the driving rod and the specimen grip portion, for measuring a load applied to the specimen.

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The biaxial tensile test apparatus according to the present invention simplifies the structure of the power source for applying the hydraulic pressure or air pressure to the four traction units at the same or a constant rate through the introduction of the concept of the driving pressure distribution unit device, The biaxial tensile properties of the material can be measured according to the load ratio in the biaxial tensile test.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a specimen being tested with a biaxial tensile test apparatus according to an embodiment of the present invention; FIG.
Fig. 2 is a perspective view showing the biaxial tensile test apparatus of Fig. 1;
3 is a perspective view showing driving force providing means and driving rod in the biaxial tensile testing apparatus of FIG.
FIG. 4 is a perspective view showing that a guide member is installed in the biaxial tensile test apparatus of FIG. 2. FIG.
Fig. 5 is a view showing a driving pressure channel in the driving pressure distribution unit in the biaxial tensile test apparatus of Fig. 2;
FIG. 6 is a view showing a driving pressure channel in the driving pressure distribution unit according to another embodiment in the biaxial tensile test apparatus of FIG. 2. FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail. In the drawings, like reference numerals are used to refer to like elements throughout the drawings, even if they are shown on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 1 is a perspective view showing an experiment of a specimen with a biaxial tensile test apparatus according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a biaxial tensile test apparatus of FIG.

FIG. 3 is a perspective view showing driving force providing means and driving rod in the biaxial tensile test apparatus of FIG. 2, and FIG. 4 is a perspective view showing that a guide member is installed in the biaxial tensile testing apparatus of FIG.

Referring to the drawings, the biaxial tensile testing apparatus of the present invention comprises four traction units 100 for pulling a specimen 1 in both directions of two biaxial shafts, and a driving force providing traction force of the traction unit 100 And providing means.

Here, the main structural feature of the present invention is that the driving force providing means is configured to provide pulling force to the four towing units 100 at the same or a certain ratio, but to distribute hydraulic pressure or air pressure to provide a pulling force .

Specifically, the traction unit 100 is configured for traction of the test piece 1, and four pieces are provided to pull the test piece 1 in four directions both in the biaxial direction, that is, in two axes on both axes.

The driving force providing unit may include a driving pressure providing unit and a driving pressure distribution unit 300 that connects the driving pressure providing unit and the traction unit 100.

Here, the driving pressure providing unit is configured to provide a hydraulic pressure or an air pressure. For example, a driving pressure supply source (not shown) for supplying hydraulic pressure or air pressure and a driving pressure supply unit And may include a driving and rolling tube (200).

Thus, by providing the hydraulic or air pressure, the drive-pressure providing unit can provide the traction unit 100 with the same or a certain ratio of traction force to the four traction units 100 when providing the traction force, and ultimately, Allow the material properties under constant load ratio to be obtained during the experiment.

In addition, the driving pressure distribution unit 300 is configured to uniformly distribute the hydraulic pressure or the air pressure provided from the driving-pressure providing unit to the four traction units 100. [

Accordingly, the present invention is advantageous in that the structure of the power source is simplified because each of the four towing units 100 does not require a separate power source.

Specifically, the driving pressure distribution unit 300 is connected to four traction units 100 around which the angle between adjacent ones is 90 degrees.

In addition, the driving pressure distribution unit 300 may be formed with a driving pressure channel 310 communicating with the driving pressure providing unit and connected to the drawing unit 100. The driving pressure channel 310 is a route through which hydraulic or air pressure is supplied, and hydraulic or air pressure is transferred to the traction unit 100 to allow the traction unit 100 to reciprocate in the same structure as the reciprocating cylinder.

In addition, the driving pressure channel 310 has a structure branched from a portion communicated with the driving pressure providing unit so as to uniformly distribute the hydraulic pressure or the air pressure to the four traction units 100, Will be described with reference to Figs. 5 and 6. Fig.

Fig. 5 is a view showing a driving pressure channel in the driving pressure distribution unit in the biaxial tensile test apparatus of Fig. 2;

5, the driving pressure supply channel 310 includes a communication portion 311 communicating with the driving pressure providing unit, and a communication portion 311 connecting the communication portion 311 And may have branching sections 312 leading to four towing units 100.

Such a structure can be utilized when a biaxial tensile test is required under axial load conditions by providing the same size of traction force to the four traction units 100. [

FIG. 6 is a view showing a driving pressure channel in the driving pressure distribution unit according to another embodiment in the biaxial tensile test apparatus of FIG. 2. FIG.

6, there are two drive pressure supply units, the drive pressure channel 310 includes a communication portion 311 communicated with each drive pressure supply unit, 311 and branched to two tow units 100 in the same axial direction.

Such a structure can provide a pulling force of the same size to the two traction units 100 in the same axial direction and different magnitudes from the two traction units 100 in the other axial direction, Can be used when biaxial tensile test is necessary.

The traction unit 100 may include a driving rod 110 having one end coupled to the driving pressure distribution unit 300 and a specimen grip 120 mounted on the other end of the driving rod 110.

Here, the driving rod 110 may be connected to the driving pressure distribution unit 300 in a structure reciprocating in both directions of the respective axes by the hydraulic pressure or the air pressure provided from the driving pressure providing unit, Although not specifically shown in the drawings, may have a structure such as a hydraulic cylinder or an air cylinder in which a reciprocating motion is realized by utilizing hydraulic pressure or air pressure.

The specimen grip part 120 is configured to grip the specimen 1 by being mounted on the other end of the driving rod 110. For example, the specimen grip part 120 can have a pressing structure that presses the specimen 1 strongly from the upper and lower sides. Further, But it is needless to say that any structure can be adopted as long as it is a structure capable of realizing a solid gripping force with respect to the specimen 1. [

On the other hand, the driving pressure distribution unit 300 may be disposed on the four sides of the traction unit 100 on a plane.

The driving rod 110 may include a driving unit 111, a driven unit 112, and a link unit 113 connecting the driving unit 111 and the driven unit 112.

Here, the driving unit 111 takes a structure radially arranged from the driving pressure distribution unit 300.

The driven part 112 is connected to the driving part 111 by the link part 113 and reciprocates when the driving part 111 reciprocates.

The driven part 112 is vertically spaced apart from the driving part 111 and is disposed in parallel to the driving part 111 so that the driving part 111 and the driven part 112 are driven by the driving pressure distribution unit 300, the driving pressure distribution unit 300 is disposed on the inner side of the four traction units 100 in a plan view.

In other words, the drive-pressure coupling unit 200 and the drive-pressure-distribution unit 300, which provide a drive force as a power source, are located at the center of the biaxial tensile test apparatus of the present invention, It has an advantage that it can be utilized at any position without being limited by space.

In addition, the traction unit 100 may further include a guide member 130 fastened to slide the driven portion 112.

The guide member 130 may be configured to guide the movement of the follower 112 interlocked with the driving unit 111 described above.

The guide member 130 is disposed on both sides of the follower portion 112 and the guide protrusion 131 is formed along the movement route of the follower portion 112 and the follower portion 112 is provided correspondingly, And guide grooves 112a into which the guide protrusions 131 are inserted and slide.

Further, the drawing unit 100 may further include a load cell 140 disposed between the driving rod 110 and the specimen grip part 120 for measuring a load applied to the specimen 1.

As a result, in the biaxial tensile test apparatus of the present invention, the driving force providing means for distributing the hydraulic pressure or the air pressure and providing the four traction units 100 with the same or a certain ratio of traction force is constituted, Since the load condition or the proportional axial load condition can be realized, the biaxial tensile test enables the measurement of the property under a constant load ratio.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is to be understood that various changes and modifications may be made without departing from the scope of the appended claims.

1: The Psalms
100: tow unit 110: drive rod
111: driving part 112:
112a: guide groove 113: link portion
120: specimen grip part 130: guide member
131: Guide protrusion 140: Load cell
200: Driving rolling fitting
300: drive pressure distribution unit 310: drive pressure channel
311: communicating part 312: branching part

Claims (10)

Four towing units that pull the specimen in both directions of each of the two axially spaced axes; And
And driving force providing means provided to provide the same or a predetermined ratio of traction force to the four traction units, wherein the driving force providing means is configured to distribute hydraulic pressure or air pressure to provide a traction force,
The driving force providing means includes:
One drive pressure providing unit for providing hydraulic pressure or air pressure; And
And a driving pressure distribution unit that connects the driving pressure providing unit and the traction unit and distributes the hydraulic pressure or the air pressure provided from the driving pressure providing unit to the four traction units uniformly,
The drive-pressure distribution unit includes:
The four towing units are connected to the periphery,
And a driving pressure channel communicating with the driving pressure providing unit and connected to the traction unit is formed therein,
Wherein the drive-
A communicating portion communicating with the drive-pressure supply unit; And
And a branching portion branched from the connecting portion and independently connected to the four towing units and distributing the hydraulic pressure or the air pressure provided from the driving pressure providing unit equally to the four towing units Device.
delete delete delete Four towing units that pull the specimen in both directions of each of the two axially spaced axes; And
And driving force providing means provided to provide the same or a predetermined ratio of traction force to the four traction units, wherein the driving force providing means is configured to distribute hydraulic pressure or air pressure to provide a traction force,
The driving force providing means includes:
Two driving pressure providing units for providing hydraulic pressure or air pressure; And
And a driving pressure distribution unit that connects the driving pressure providing unit and the traction unit and distributes the hydraulic pressure or the air pressure provided from the driving pressure providing unit to the four traction units uniformly,
The drive-pressure distribution unit includes:
The four towing units are connected to the periphery,
And a driving pressure channel communicating with the driving pressure providing unit and connected to the traction unit is formed therein,
Wherein the drive-
A communication portion communicating with each of the drive-pressure supply units; And
And a plurality of branch portions branched from each of the communication portions and connected to the tow unit,
One branch portion is connected to a pair of said tow units for towing said specimen in the uniaxial direction and another branch portion is connected to another pair of said tow units for towing said specimen in the other axis direction, Independent biaxial tensile test apparatus.
6. The method according to claim 1 or 5,
The tow unit includes:
A drive rod connected at one end to the drive pressure distribution unit and reciprocating in the axial direction by hydraulic pressure or air pressure provided from the drive pressure supply unit; And
A specimen grip portion mounted on the other end of the driving rod to grip the specimen;
And a biaxial tensile test apparatus.
The method according to claim 6,
Wherein the driving pressure distribution unit is disposed on the inner side of the four traction units in a plan view.
8. The method of claim 7,
The drive rod
A driving unit radially disposed from the driving pressure distribution unit;
A driven part spaced apart from the driving part in a vertical direction and arranged in parallel with the driving part; And
A link unit connecting the driving unit and the driven unit;
And a biaxial tensile test apparatus.
9. The method of claim 8,
The tow unit includes:
A guide member slidably coupled to the follower unit so as to guide movement of the follower unit interlocked with the drive unit;
Further comprising a biaxial tensile test apparatus.
The method according to claim 6,
The tow unit includes:
A load cell disposed between the driving rod and the specimen grip section for measuring a load applied to the specimen;
Further comprising a biaxial tensile test apparatus.
KR1020150184046A 2015-12-22 2015-12-22 Apparatus for biaxial tention test KR101758508B1 (en)

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Publication number Priority date Publication date Assignee Title
CN108896394B (en) * 2018-07-13 2023-12-29 中国工程物理研究院总体工程研究所 Material biax compression loading device
CN111551333A (en) * 2020-06-12 2020-08-18 苏州苏试试验集团股份有限公司 Composite test device capable of loading tension or pressure and vibration
CN117757193A (en) * 2023-10-26 2024-03-26 青岛惠陆有机硅有限公司 Preparation method of ethylene propylene diene monomer
CN117191578B (en) * 2023-11-06 2024-01-23 江苏博盟科技有限公司 Automobile rubber piece tensile testing device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007163257A (en) * 2005-12-13 2007-06-28 Shimadzu Corp Biaxial tensile tester
JP2012032218A (en) * 2010-07-29 2012-02-16 Nihon Univ Biaxial tension test device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007163257A (en) * 2005-12-13 2007-06-28 Shimadzu Corp Biaxial tensile tester
JP2012032218A (en) * 2010-07-29 2012-02-16 Nihon Univ Biaxial tension test device

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