KR101865582B1 - Apparatus for Measuring the Cross-section Area and Curvature Radius of Material Tensile Test Specimen - Google Patents

Apparatus for Measuring the Cross-section Area and Curvature Radius of Material Tensile Test Specimen Download PDF

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Publication number
KR101865582B1
KR101865582B1 KR1020180039416A KR20180039416A KR101865582B1 KR 101865582 B1 KR101865582 B1 KR 101865582B1 KR 1020180039416 A KR1020180039416 A KR 1020180039416A KR 20180039416 A KR20180039416 A KR 20180039416A KR 101865582 B1 KR101865582 B1 KR 101865582B1
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South Korea
Prior art keywords
tensile test
test piece
knife edge
connector
sensing
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KR1020180039416A
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Korean (ko)
Inventor
이사용
박준현
김선화
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주식회사 스탠더드시험연구소
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/20—Measuring arrangements characterised by the use of mechanical techniques for measuring contours or curvatures
    • G01B5/213—Measuring arrangements characterised by the use of mechanical techniques for measuring contours or curvatures for measuring radius of curvature
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/26—Measuring arrangements characterised by the use of mechanical techniques for measuring areas, e.g. planimeters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
    • G01D11/16—Elements for restraining, or preventing the movement of, parts, e.g. for zeroising
    • G01D11/18—Springs
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • 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

Abstract

The present invention relates to an apparatus for measuring the cross-sectional area and curvature radius of a tensile test specimen. The apparatus can accurately measure a deformed shape of a necking area in concert with a tensile tester in a high-temperature condition. The apparatus includes: a case including first and second sidewall portions and a connector connecting the first and second sidewall portions, with a tensile test specimen being disposed between the first and second sidewall portions; an upper position adjusting unit including an upper gripper fixedly disposed above the tensile test specimen, an upper distance maintaining portion disposed between the upper gripper and a top portion of the connector to maintain a distance between the upper gripper and the connector before a tensile test, and an upper elastic member having one end connected to the upper gripper and the other end connected to the top portion of the connector to apply elastic force to the connector to displace the connector upwards when a top portion of the tensile test specimen is pulled upwards in the tensile test; a lower position adjusting unit including a lower gripper fixedly disposed below the tensile test specimen, a lower distance maintaining portion disposed between the lower gripper and a bottom portion of the connector to maintain a distance between the lower gripper and the connector before the tensile test, and a lower elastic member having one end connected to the lower gripper and the other end connected to the bottom portion of the connector to apply elastic force to the connector downwards when the top portion of the tensile test specimen is pulled upwards; and first and second sensing units disposed on the first and second sidewall portions, respectively.

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus for measuring a cross-sectional area and a radius of curvature of a tensile test piece,

TECHNICAL FIELD The present invention relates to an apparatus for measuring a cross-sectional area and a radius of curvature of a tensile test specimen, and more particularly, to a cross-sectional area and curvature radius measuring apparatus of a tensile test specimen capable of accurately measuring a deformed shape of a necking region, .

Although the true stress-strain curves of metal materials are essential to the process design engineers due to the generalization of the plastic working process analysis techniques, it is not easy to acquire them experimentally, so the field engineers as well as the researchers often do not know the accurate material information. Limited information is available from the literature.

In general, tensile tests are the most common method to obtain the physical properties of materials. Through these tests, tensile tests are carried out using Young's modulus, Yield stress and tensile strength as well as true stress- (True stress-strain curve).

However, due to the phenomenon of necking occurring in the tensile test, there is a limit to obtaining the correlation between stress and strain necessary for the plastic flow analysis. Until the necking, the true stress-strain curve can be obtained from the tensile test results under the assumption of incompressibility, but if necking occurs, no further information can be obtained from the above conditions.

However, since the accuracy is low and the measurement itself is not easy, it is difficult to find commercialized results in connection with the tensile tester, and in particular, it is difficult to measure the stress- Making the measurement more difficult.

In addition, numerical analysis such as finite element analysis is applied to the conventional tensile test method to calculate the true stress - strain after the necking, but the trial and error process is required several times or several times Japanese Patent Application Laid-Open No. 10-2008-0002410).

In addition, although a method of measuring the cross-sectional area and the radius of curvature through an optical sensor and image processing has been proposed (Japanese Patent Application Laid-Open No. 10-2016-0077704), since the temperature of the optical equipment can not be mounted inside the high- Can not be applied to testing in a high temperature environment such as a high temperature material test that can be used in a high temperature environment.

Therefore, it is required to develop a device capable of precisely measuring the deformed shape of the necked area in conjunction with the tensile tester under high temperature conditions.

Japanese Patent Application Laid-Open No. 10-2008-0002410 (published on April 4, 2008) Open Patent Publication No. 10-2016-0077704 (published Jul.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a tensile test piece capable of measuring a cross-sectional area and a curvature change at the same specific point of the tensile test piece, And to provide an apparatus for measuring a cross-sectional area and a radius of curvature of a tensile test piece which can accurately measure the same even in an environment in which a chamber is installed.

In order to achieve the above object, a tensile test piece 10 according to an embodiment of the present invention includes first and second sidewall portions 110 and 120, first and second sidewall portions 110 and 120, A case 100 formed of a connecting part 130 connecting the first and second side walls 110 and 120 and the tensile test piece 10 disposed between the first and second side walls 110 and 120, 10 between the upper grip part 210 and the connection part 130 and between the upper grip part 210 and the connection part 130 before the tensile test, And an upper elastic body 230 having an upper gap retaining part 220 for maintaining an interval and an upper elastic body 230 having one end connected to the upper grip part 210 and the other end connected to an upper part of the connection part 130. [ ); A lower grip portion 310 fixed to the lower portion of the tensile test piece 10 and a lower grip portion 310 disposed between the lower grip portion 310 and the lower portion of the connection portion 130. The lower grip portion 310, And a lower elastic body 330 having one end connected to the lower grip part 310 and the other end connected to the lower part of the connection part 130. The lower elastic body 330 has a lower space- The first and second sensing devices 400 and 500 may be installed on the first and second sidewall portions 110 and 120, respectively.

The first and second sidewall portions 110 and 120 may include first and second receiving spaces 140 and 150 formed to open the direction of the tensile test piece 10, respectively. The first sensing device 400 includes a first body portion 410 installed in the first accommodation space 140 and a second body portion 410 disposed inside the first body portion 410 in the direction of the tensile test piece 10 And the other end of the first space part 420 protrudes outward from the first space part 420. The other end of the first space part 420 is horizontally moved to be in contact with the tensile test piece 10, The knife edge 430 is provided between the inside of the first space 420 and one end of the first knife edge 430 so that the other end of the first knife edge 430 is in contact with the tensile test piece 10 And a first sensing elastic member 440 for applying a resilient force to the first knife edge 430 so that the horizontal movement distance of the first knife edge 430 horizontally moves in accordance with a change in cross-sectional area of the tensile test piece 10 during a tensile test, And a sensing unit 450. The second sensing device 500 may include a second body 510 disposed in the second accommodation space 150 and a second body 510 disposed within the second body 510 to be opened in the direction of the tensile test piece 10. The other end of the second space portion 520 protrudes out of the second space 520 and the other end of the second space portion 520 is horizontally moved so as to be in contact with the tensile test piece 10. And the second knife edge 530 is disposed between the second space portion 520 and one end of the second knife edge 530 so that the other end of the second knife edge 530 is in contact with the tensile test piece 10. A second sensing elastic body 540 for applying an elastic force and a second sensing unit 540 for measuring the horizontal movement distance of the second knife edge 530 which moves horizontally in accordance with a change in sectional area of the tensile test piece 10 during a tensile test, The first sensing device 400 may include a first sensing unit 400 and a second sensing unit 500. The first sensing unit 400 may include a first sensing unit 400, Schedule, and provided with at least three of the spaced apart intervals to the second sensing device 500 may be the first predetermined interval is spaced in the vertical direction in the second receiving space 150 are provided at least three.

The first sidewall part 110 includes a first deviation preventing part 160 protruding in the direction of the first knife edge 430 along a rim of a portion opened toward the tensile test piece 10; A first gap-forming elastic body provided between the first separation preventing portion 160 and the first body portion 410 and applying an elastic force to move the first body portion 410 away from the tensile test piece 10 170); And a first gap adjusting mechanism provided between the first body portion 410 and the inner surface of the first accommodation space portion 140 to move the first body portion 410 toward the tensile test piece 10 And the second side wall part 120 includes a second release preventing part 530 protruding in the direction of the second knife edge 530 along the rim of the portion opened in the direction of the tensile test piece 10 180); A second gap-forming elastic body provided between the second separation preventing part 180 and the second body part 510 to apply an elastic force to move the second body part 510 away from the tensile test piece 10 190); And a second gap adjusting mechanism provided between the second body part 510 and the inner surface of the second accommodation space part 150 to move the second body part 510 toward the tensile test piece 10 196).

According to the embodiment of the present invention, the true stress and the true strain of the tensile test piece 10 are measured by measuring the change in cross-sectional area and curvature at the same specific point of the tensile test piece 10 even when the tensile test piece 10 is elongated can do.

Also, through the configuration of the first and second sensing devices 400 and 500 according to the embodiment of the present invention, the cross-sectional area and curvature change of the tensile test piece 10 can be precisely measured even in an environment in which a chamber for realizing a high- .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of an apparatus for measuring the cross-sectional area and radius of curvature of a tensile test specimen according to the present invention; FIG.
2 is a sectional view of a cross-sectional area and a radius of curvature measuring device of a tensile test piece according to the present invention.
3 is a sectional view of a cross-sectional area and a radius of curvature measuring device of a tensile test piece according to the present invention.

Hereinafter, an apparatus for measuring a cross-sectional area and a radius of curvature of a tensile test piece according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a schematic view of a cross-sectional area and a radius of curvature measuring apparatus of the tensile test piece of the present invention, and Figs. 1 (a) and 1 (b) show before tensile test and during tensile test, respectively. FIG. 2 shows a first and a second sensing device 400 and 500 in detail in a cross section AA 'of FIG. 1. FIG. 2 (a) and FIG. 2 (b) illustrate, before tensile test and tensile test, Indicating that an area has occurred. FIG. 3 is a cross-sectional view schematically showing the coupling structure between the case 100 and the first and second sensing devices 400 and 500 in cross section BB 'of FIG. 1. FIGS. 3 (a) and 3 (b) And a state in which tensile test specimens are placed.

In the present invention, the lower part of the tensile test piece 10 is fixed at the time of tensile test, and the tensile test piece 10 is pulled by applying a force to the upper part. The method of simultaneously pulling the upper and lower parts of the tensile test piece 10, Is applicable.

1 to 3, the cross-sectional area and the radius of curvature measuring device of the tensile test piece according to the embodiment of the present invention are roughly divided into a case 100, an upper position adjusting device 200, a lower position adjusting device 300, 1, 2 sensing devices 400, 500, respectively.

The case 100 includes first and second side wall portions 110 and 120 and a connecting portion 130 connecting the first and second side wall portions 110 and 120, A tensile test piece 10 is disposed between the first and second side wall portions 110 and 120.

The first and second sensing devices 400 and 500 may be provided symmetrically on both sides of the tensile test piece 10 in order to measure the cross-sectional area and the change thereof at a specific point of the tensile test piece 10 during the tensile test, The two sensing devices 400 and 500 may be installed in the first and second sidewall portions 110 and 120 and the first and second sensing devices 400 and 500 and the first and second sidewall portions 110 and 120 Of the tensile test specimen 10 is aligned with the center of the tensile test piece 10.

The first and second sensing devices 400 and 500 may have a receiving unit (not shown) attached to the first and second sidewall parts 110 and 120 so that the first and second sensing devices 400 and 500 can relatively move in the first and second sidewall parts 110 and 120, The first and second sensing devices 400 and 500 and the first and second sidewall portions 110 and 120 may be configured to be engaged with each other on at least one surface.

If the positions of the first and second sensing devices 400 and 500 are fixed, the tensile test piece 10 is stretched and the position of the tensile test piece 10 measured by the first and second sensing devices 400 and 500 . The position of the first and second sensing devices 400 and 500 is changed as the tensile test piece 10 is stretched so that the cross sectional area and the change at the same specific point of the tensile test piece 10 can be continuously measured. 130 may be provided with upper and lower position adjusting devices 200, 300, respectively.

Specifically, the upper position adjusting device 200 includes an upper grip portion 210 fixedly installed on the upper portion of the tensile test piece 10; An upper gap holding part 220 disposed between the upper grip part 210 and the upper part of the connection part 130 to maintain a gap between the upper grip part 210 and the connection part 130 before the tensile test; And one end connected to the upper grip portion 210 and the other end connected to the upper portion of the connection portion 130 so that when the upper portion of the tensile test piece 10 is pulled upward, The upper elastic body 230 may be formed of an elastic material.

Further, the lower position adjusting device 300 includes a lower grip portion 310 fixed to the lower portion of the tensile test piece 10; A lower gap holding portion 320 disposed between the lower grip portion 310 and the lower portion of the connection portion 130 to maintain a gap between the lower grip portion 310 and the connection portion 130 before the tensile test; And one end is connected to the lower grip part 310 and the other end is connected to the lower part of the connection part 130 so that an elastic force can be applied to the connection part 130 downwardly when the upper part of the tensile test piece 10 is pulled upward. And the lower elastic body 330 may be installed.

The upper and lower grip portions 210 and 310 may be formed in a pin fixing shape or a clamping shape so that one side thereof is fixed to the upper and lower portions of the tensile test piece 10, respectively.

The upper and lower spacers 220 and 320 may be in the shape of a pipe having a predetermined length in which the upper elastic body 230 can be disposed.

As shown in FIG. 1 (b), if the upper and lower elastic members 230 and 330 have the same elastic modulus, the distance that the center of the connection portion 130 moves corresponds to half of the length of the upper portion of the tensile test piece 10, Since the center of the tensile test piece 10 corresponds to the elongated length, even if the tensile test piece 10 is stretched, the cross-sectional area and the change thereof can be measured by the first and second sensing devices 400 and 500 at the center of the tensile test piece 10 .

That is, even if the tensile test piece 10 is stretched, the deformation shape of the necked region can be accurately measured by measuring the cross-sectional area and the change at the same specific point of the tensile test piece 10. [

Further, by making the lengths of the upper and lower spacers 220 and 320 different from each other or making the elastic modulus of the upper and lower elastic members 230 and 330 different from each other, the cross-sectional area can be measured at a point other than the center of the tensile test piece 10 have.

For application to nuclear power plants, it is necessary to perform a tensile test in a high temperature environment such as a high temperature material test. In this case, the cross-sectional area measurement method using an optical sensor and image processing can not be applied to the use temperature problem of optical equipment. A sensing device having the same mechanical structure as that of the embodiment of the present invention is required.

The first sensing device 400 includes a first body 410 installed in the first accommodation space 140 formed in the first sidewall 110 so as to open the direction of the tensile test piece 10, ; One side of the first body part 410 is provided with a first space part 420 formed to open in the direction of the tensile test piece 10 and the other side thereof protrudes to the outside of the first space part 420, A first knife edge 430 horizontally moving so that an end thereof abuts against the tensile test piece 10; A first sensing elastic member 430 provided between the inside of the first space portion 420 and one end of the first knife edge 430 to apply an elastic force such that the other end of the first knife edge 430 contacts the tensile test piece 10, (440); And a first sensing unit 450 capable of measuring a horizontal movement distance of the first knife edge 430 moving horizontally according to a change in cross-sectional area of the tensile test piece 10 during a tensile test.

The second sensing device 500 further includes a second body portion 510 installed in the second accommodation space 150 formed in the second side wall portion 120 so as to open the direction of the tensile test piece 10; The second body portion 510 has one side in the second space 520 formed to open in the direction of the tensile test piece 10 and the other side protrudes to the outside of the second space 520, A second knife edge 530 that horizontally moves so that its tip abuts against the tensile test piece 10; The second sensing elastic member 530 is provided between the inside of the second space 520 and one end of the second knife edge 530 so that the other end of the second knife edge 530 is brought into contact with the tensile test piece 10. (540); And a second sensing unit 550 capable of measuring the horizontal movement distance of the second knife edge 530 moving horizontally according to a change in cross-sectional area of the tensile test piece 10 during the tensile test.

The portions of the first and second body portions 410 opened in the direction of the tensile test piece 10 are pierced so as to correspond to the end faces of the first and second knife edges 430 and 530, The knife edges 430 and 530 can only be moved in the horizontal direction.

The other end of each of the first and second knife edges 430 and 530 that abuts the tensile test piece 10 may be a triangular shape having a sharp edge and a corner having a radius of 0.05 to 0.1 mm, Graphite may be coated to reduce the friction with < / RTI >

The first and second sensing units 450 and 550 may be a measurement station capable of measuring the horizontal movement distance of the first and second knife edges 430 and 530, respectively. In this case, since strain measurement devices such as strain gauges can not be used in a high-temperature environment, strain can be obtained by mechanically connecting the strain of the tensile test specimen to the outside of the high temperature chamber so as to enable accurate measurement even at a high temperature. It is possible to use a principle such as an optical lever, a linear voltage differential transformer (LVDT) and a capacitance sensor, but not limited thereto, and to measure the horizontal movement distance of the first and second knife edges 430 and 530 It would be enough.

On the other hand, the true stress and the true strain of the tensile test piece 10 can be calculated using the radius of curvature of the necked region as shown in the following equation (1), and the radius of curvature can be obtained from the equation of the circle passing through three points .

[Equation 1]

Figure 112018033715451-pat00001

Here, m 2 represents the minimum diameter in the necking area which can be measured by the middle first and second knife edges 430 and 530, as shown in FIG.

This allows us to determine the true stress-strain curve, which can improve production efficiency in engineering analysis. In addition, since the strain can be calculated from the measured cross-sectional area, it is not necessary to provide a separate extensometer.

In order to do this, the first sensing device 400 is spaced apart from the first sensing space 140 by a predetermined distance in the vertical direction, and the second sensing device 500 includes a second sensing space 150 At least three or more of them may be provided.

Meanwhile, in order to arrange the tensile test piece 10 between the first and second sensing devices 400 and 500, specifically between the first and second knife edges 430 and 530 for the tensile test, A configuration for adjusting the spacing of the devices 400 and 500 is required.

To this end, the first sidewall portion 110 includes a first deviation preventing portion 160 protruding in the direction of the first knife edge 430 along the rim of the portion opened in the direction of the tensile test piece 10; A first gap-forming elastic body 170 provided between the first separation preventing portion 160 and the first body portion 410 to apply an elastic force to move the first body portion 410 away from the tensile test piece 10; And a first gap adjusting mechanism 195 provided between the first body part 410 and the inner surface of the first accommodation space part 140 to move the first body part 410 in the direction of the tensile test piece 10 .

The second sidewall portion 120 includes a second deviation preventing portion 180 protruding in the direction of the second knife edge 530 along the rim of the portion opened in the direction of the tensile test piece 10; A second gap-forming elastic body 190 provided between the second separation preventing portion 180 and the second body portion 510 to apply an elastic force to move the second body portion 510 away from the tensile test piece 10; And a second gap adjusting mechanism 196 provided between the second body part 510 and the inner surface of the second accommodation space part 150 to move the second body part 510 in the direction of the tensile test piece 10 .

Since the first and second gap forming elastic bodies 170 and 180 push the first and second body portions 410 and 510 away from the tensile test piece 10 respectively, the first and second gap adjusting mechanisms 195 and 196 The tensile test piece 10 can be disposed between the first and second knife edges 430 and 530 by widening the gap between the first and second body portions 410 and 510. [

After the tensile test piece 10 is disposed, the first and second gap adjusting mechanisms 195 and 196 are adjusted to narrow the gap between the first and second bodies 410 and 510 so that the first and second knife edges 430 and & 530 may be brought into contact with the tensile test piece 10 to perform a tensile test.

On the other hand, in the tensile test using the measuring apparatus, it may be necessary to grasp the distance between the first and second side wall portions 110 and 120 and the moving distance or position information of the first and second body portions 410 and 510 .

Since the interval between the first and second side wall portions 110 and 120 is fixed, it is determined as a constant.

The first and second body portions 410 and 510 are moved by the operation of the first and second gap forming elastic bodies 170 and 180 during the tensile test and the movement distance or position may be constant And may vary depending on the specimen or test conditions. If the moving distance or position of the first and second body parts 410 and 510 is constant under all the test pieces or test conditions, the moving distance or position of the first and second body parts 410 and 510 will be determined as a constant. Accordingly, if the positions of the first and second body parts 410 and 510 are constant under all test pieces or test conditions, the present measuring device can be more conveniently used. If the moving distance or the position of the first and second body parts 410 and 510 is inevitably changed, such as when the diameter of the test piece is very large or very small, after setting the tensile test conditions, A moving distance or position of the body portions 410 and 510 may be directly measured or input to the test analyzer or a sensing portion may be additionally provided to measure the moving positions of the first and second body portions 410 and 510, It can also be measured through.

The apparatus for measuring the cross-sectional area and the radius of curvature of the tensile test piece according to the present invention has advantages that it can be directly applied to a conventional tensile tester because it is installed directly on the tensile test piece.

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 appended claims. It goes without saying that various modifications can be made.

10: tensile test piece 100: case 110: first side wall part
120: second side wall part 130: connection part 140: first accommodation space part
150: second accommodation space part 160: first departure prevention part 170: first interval forming elastic body
180: second departure prevention part 190: second gap-forming elastic body
195: first interval adjusting mechanism 196: second interval adjusting mechanism
200: upper position adjusting device 210: upper grip portion 220: upper gap holding portion
230: upper elastic body 300: lower position adjusting device 310: lower grip portion
320: Lower space retaining part 330: Lower elastic body 400: First sensing device
410: first body part 420: first space part 430: first knife edge
440: first sensing elastic body 450: first sensing portion 500: second sensing device
510: second body part 520: second space part 530: second knife edge
540: second sensing elastic body 550: second sensing portion

Claims (3)

In the cross-sectional area and curvature radius measuring device of the tensile test piece 10,
And a connection part 130 connecting the first and second sidewall parts 110 and 120 and the first and second sidewall parts 110 and 120. The first and second sidewall parts 110 and 120 A case 100 formed to arrange the tensile test piece 10;
An upper grip portion 210 fixed to the upper portion of the tensile test piece 10 and an upper grip portion 210 disposed between the upper grip portion 210 and the upper portion of the connection portion 130, And an upper elastic body 230 having one end connected to the upper grip part 210 and the other end connected to the upper part of the connection part 130 Adjustment device 200;
A lower grip portion 310 fixed to the lower portion of the tensile test piece 10 and a lower grip portion 310 disposed between the lower grip portion 310 and the lower portion of the connection portion 130. The lower grip portion 310 and the connection portion And a lower elastic body 330 having one end connected to the lower grip part 310 and the other end connected to the lower part of the connection part 130. The lower elastic body 330 is connected to the lower grip part 310, Adjustment device 300; And
And first and second sensing devices (400 and 500) installed in the first and second sidewall parts (110 and 120) to measure a change in sectional area of the tensile test piece (10)
The first and second sidewall portions 110 and 120 include first and second accommodation spaces 140 and 150 formed to open the tensile test piece 10,
The first sensing device (400)
A first body part 410 installed in the first accommodation space part 140; One side of the first body part 410 is provided with a first space part 420 formed to open in the direction of the tensile test piece 10 and the other side of the first body part 410 protrudes outside the first space part 420 A first knife edge 430 horizontally moving so that the other end of the first knife edge 430 abuts against the tensile test piece 10; The first knife edge 430 is provided between the first space portion 420 and one end of the first knife edge 430 so that the other end of the first knife edge 430 contacts the tensile test piece 10 A first sensing elastic body 440; And a first sensing unit 450 capable of measuring a horizontal movement distance of the first knife edge 430 moving horizontally according to a change in cross-sectional area of the tensile test piece 10 during a tensile test,
The second sensing device (500)
A second body part 510 installed in the second accommodation space part 150; One side of the second body part 510 is formed in a second space part 520 formed to be opened in the direction of the tensile test piece 10 and the other side is protruded to the outside of the second space part 520 A second knife edge 530 for horizontally moving the other end of the second knife edge so as to be in contact with the tensile test piece 10; The second knife edge 530 is provided between the inside of the second space 520 and one end of the second knife edge 530 so as to apply an elastic force such that the other end of the second knife edge 530 comes into contact with the tensile test piece 10 A second sensing elastic body 540; And a second sensing unit 550 capable of measuring a horizontal movement distance of the second knife edge 530 which moves horizontally according to a change in cross-sectional area of the tensile test piece 10 during a tensile test,
The first sensing device 400 includes at least three spaced apart from each other in the vertical direction within the first accommodation space 140 and the second sensing device 500 includes the second accommodation space 150 Wherein at least three of the tensile test specimens are spaced apart from each other by a predetermined distance in the vertical direction.
delete The method according to claim 1,
The first sidewall portion 110 includes a first deviation preventing portion 160 protruding in the direction of the first knife edge 430 along a rim of a portion opened toward the tensile test piece 10;
A first gap-forming elastic body provided between the first separation preventing portion 160 and the first body portion 410 and applying an elastic force to move the first body portion 410 away from the tensile test piece 10 170); And
A first gap adjusting mechanism 195 provided between the first body portion 410 and the inner surface of the first accommodation space portion 140 to move the first body portion 410 toward the tensile test piece 10 Further comprising:
The second sidewall portion 120 includes a second deviation preventing portion 180 protruding in the direction of the second knife edge 530 along a rim of the portion opened toward the tensile test piece 10;
A second gap-forming elastic body provided between the second separation preventing part 180 and the second body part 510 to apply an elastic force to move the second body part 510 away from the tensile test piece 10 190); And
A second gap adjusting mechanism 196 provided between the second body 510 and the inner surface of the second accommodation space 150 to move the second body 510 toward the tensile test piece 10 And a cross-sectional area and a radius of curvature of the tensile test piece.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113124739A (en) * 2019-12-31 2021-07-16 中国航发商用航空发动机有限责任公司 Plug type axisymmetric nozzle outlet section measuring device and measuring method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008209228A (en) 2007-02-26 2008-09-11 Kochi Univ Of Technology Tensile test tool and method for concrete
US9797819B2 (en) 2012-03-08 2017-10-24 Regents Of The University Of Minnesota Sensor for tension measurement

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008209228A (en) 2007-02-26 2008-09-11 Kochi Univ Of Technology Tensile test tool and method for concrete
US9797819B2 (en) 2012-03-08 2017-10-24 Regents Of The University Of Minnesota Sensor for tension measurement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113124739A (en) * 2019-12-31 2021-07-16 中国航发商用航空发动机有限责任公司 Plug type axisymmetric nozzle outlet section measuring device and measuring method
CN113124739B (en) * 2019-12-31 2023-02-24 中国航发商用航空发动机有限责任公司 Plug type axisymmetric nozzle outlet cross section measuring device and measuring method

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