KR20130053069A - Specimen clamping structure of tension-compression tester - Google Patents

Abstract

The present invention relates to a specimen clamping structure of a tensile compression test device, the specimen clamping structure of the tensile compression test apparatus that can be aligned accurately and easily by horizontally placing the specimen, and can be tested under various temperature conditions by applying heat to the specimen The purpose is to provide. In order to achieve the above object, the present invention, in the tensile compression test device for clamping both sides of the specimen to apply repeated tensile and compressive force, and detect the load and deformation state of the specimen in accordance with the applied tension and compression force, arranged in a horizontal direction A specimen supporter supporting the bottom of the specimen so as to be possible; First clamping means for clamping one side of the specimen placed on the specimen support means; Second clamping means for clamping the other side of the specimen placed on the specimen support means and installed to be movable in a horizontal direction; And a dynamic load unit for moving the second clamping means to apply a tensile or compressive force to the specimen.

Description

Specimen clamping structure of tensile compression tester {SPECIMEN CLAMPING STRUCTURE OF TENSION-COMPRESSION TESTER}

The present invention relates to a specimen clamping structure of a tensile compression test apparatus, and more particularly, to a tensile compression test apparatus capable of aligning the specimen accurately and easily by horizontally arranging the specimen, and applying the heat to the specimen to test under various temperature conditions. Of the specimen clamping structure.

The present invention is derived from a study conducted as part of the WPM (World Premier Materials) project of the Ministry of Knowledge Economy [task name: high-performance plate material, task unique number: 10037929, specialized research management organization: Korea Institute of Industrial Technology Evaluation and Management].

Due to problems such as energy exhaustion and global warming, there is a growing demand for lightweight transportation equipment parts industry such as automobiles. The most significant way to develop lightweight components is to use lightweight metals. Magnesium alloy material is environmentally friendly and is a representative lightweight material with high specific strength. In addition, as national interest and investment in magnesium alloys have increased, it is expected to improve price competitiveness and develop high-performance materials.

Magnesium alloys were manufactured mainly using die-casting. Recently, however, a molding method using a magnesium alloy sheet has been actively studied. However, due to the low formability and productivity at room temperature, sheet forming methods are currently applied only to limited parts. The key factor in securing formability maximization technology of magnesium alloy sheet is the development of constitutive model and failure model. The material properties of the magnesium alloy sheet differ from those of the existing metal sheet. Using conventional structural formulas and fracture models for analysis of parts using magnesium alloy plates with different properties from conventional metal plate materials, such as asymmetric stress-strain behavior due to twin deformation, has many errors.

In addition to the above-mentioned magnesium, the material properties of the metal material are often not exactly in accordance with the general structural formula and the analysis by the failure model. Accordingly, development of structural formulas, fracture models, and the like for more accurate analysis of tensile-compression behavior of various kinds of metal sheets is required. For this purpose, a test apparatus capable of obtaining more accurate test results under various conditions is required. do.

However, since the conventional tensile-compression test apparatus has a structure in which the upper and lower ends of the specimen are arranged in the vertical direction and the tensile force and the compressive force are applied in the vertical direction, it is difficult to accurately align the specimen, Unexpected buckling phenomenon occurs in the test result and the reliability of the test result is deteriorated.

In addition, the conventional tensile-compression test apparatus has no means of controlling the temperature of the specimen, there is no problem that can not analyze the material properties under various temperature conditions to match the actual use environment.

The present invention is to solve the problems described above, it is possible to precisely and easily align the specimen by horizontally arranged, the specimen clamping structure of the tensile compression test apparatus that can be tested under various temperature conditions by applying heat to the specimen The purpose is to provide.

The present invention for achieving the above object, in the tensile compression test device for clamping both sides of the specimen to apply a repeated tension and compression force, and detect the load and deformation state of the specimen according to the applied tension and compression force, in the horizontal direction A specimen supporter supporting the bottom of the specimen to be disposed; First clamping means for clamping one side of the specimen placed on the specimen support means; Second clamping means for clamping the other side of the specimen placed on the specimen support means and installed to be movable in a horizontal direction; And it provides a specimen clamping structure of the tensile compression test apparatus including a dynamic load unit for moving the second clamping means to apply a tensile or compressive force to the specimen.

In the present invention, the first clamping means, the first support having a support surface in contact with the bottom surface of the specimen on the upper surface, one side of the specimen placed on the first support so as to be elevated on the first support And a first clamp for pressing and fixing an end portion, wherein the second clamping means is integrally provided with a second support having a support surface on which a bottom surface of the specimen is in contact with the top surface, the second clamp being provided to be movable along a guide. It can be configured to include a second clamp that is movable to the upper and the second support to the elevating and fixed to one end of the specimen placed on the second support.

The specimen supports may be formed by extending the first support side toward the second support side and spaced apart from each other by a plurality of first support pieces, and the second support extending toward the first support side and spaced apart from each other by a predetermined distance. And a plurality of second support pieces inserted into the first support pieces so as to be movable between the first support pieces.

Preferably, the static load unit may be provided in contact with the upper surface of the specimen disposed on the specimen support to prevent the transverse deformation of the specimen. The static load unit may be configured to include an actuator installed on the specimen supporter to provide a vertical actuation force, and a pusher connected to a lower portion of the actuator to move up / down toward the specimen. In this case, it is more preferable that the support roller which is in contact with the cloud on the upper surface of the specimen below the pusher is installed.

According to the present invention configured as described above has the following effects.

(1) By analyzing the tensile compression behavior in a state where the specimen is placed horizontally on the support, alignment of the specimen can be made easier and more accurate, thereby reducing the time and effort required for the tensile compression test of the metal material, and the test accuracy There is an effect to improve.

(2) By installing a heater and a cooler at the lower part of the support for supporting the specimen so that the temperature of the specimen can be adjusted quickly and freely, there is an effect that the test under various temperature conditions can be performed more easily and accurately.

(3) By suppressing the horizontal direction of the specimen by the static load unit when tensile and compressive forces are applied to the specimen, it is possible to prevent the occurrence of errors and failure of the test results due to lateral deformation including buckling of the specimen and to prevent failure of the test. This has the effect of further improving accuracy.

(4) By installing a roller on the pusher of the static load unit to reduce the resistance to horizontal deformation of the specimen, there is an effect that can further improve the test accuracy.

1 is a front view showing an embodiment of a specimen clamping structure of the tensile compression test apparatus according to the present invention.
2 is a plan view of a specimen clamping structure of the tensile compression test apparatus of the present invention shown in FIG.
3 is a side view of the specimen clamping structure of the tensile compression test apparatus of the present invention shown in FIG.
4 is a plan view of a specimen fixing unit which is the main part of the present invention.
5 is a front view of the specimen fixing unit shown in FIG.
6 is a side view of the specimen fixing unit shown in FIG.
7 is a front view of a static load unit that is another main part of the present invention.
8 is a side view of the static load unit shown in FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

The following specific structures or functional descriptions are merely illustrated for the purpose of describing embodiments in accordance with the inventive concept, and embodiments according to the inventive concept may be embodied in various forms and may be described in detail herein. It should not be construed as limited to the examples.

Embodiments in accordance with the concepts of the present invention can be variously modified and have a variety of forms, specific embodiments will be illustrated in the drawings and described in detail herein. However, it should be understood that the embodiments according to the concept of the present invention are not intended to limit the present invention to specific modes of operation, but include all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.

The terms first and / or second etc. may be used to describe various components, but the components are not limited to these terms. The terms may be named for the purpose of distinguishing one element from another, for example, without departing from the scope of the right according to the concept of the present invention, the first element being referred to as the second element, The second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when it is mentioned that an element is "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Other expressions for describing the relationship between components, such as "between" and "immediately between" or "adjacent to" and "directly adjacent to", should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. The terms "comprise" or "having" herein are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof that is practiced, and that one or more other features or numbers, It is to be understood that it does not exclude in advance the possibility of the presence or addition of steps, actions, components, parts or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning of the context in the relevant art and, unless explicitly defined herein, are to be interpreted as ideal or overly formal Do not.

Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

As shown in Figure 1 to 8, the tensile compression test apparatus to which the present invention is applied, the specimen fixing unit 110, the dynamic load unit 130 installed on the base 100 and the base 100 , The static load unit 150, the dynamic load unit 130 and the control unit 170 for controlling the operating state of the static load unit 150.

The specimen fixing unit 110 is to support and clamp the specimen in a horizontal state to receive a tensile or compressive force by the dynamic load unit 130, the first support 111 fixed on the base 100 ), The first clamp 112 to be installed on the upper portion of the first support 111 to fix one end of the specimen on the first support 111, in a direction close to or spaced apart from the first support 111 The second support 113 is installed on the base 100 so as to be movable horizontally, and the second clamp 114 is installed to be movable together with the second support 113 on the upper portion of the second support 113.

The first support 111 is provided with a specimen support surface 115 at the upper portion of the first fixing part 116 and the first fixing part for fixing one end of the specimen as the first clamp 112 descends. And a first specimen support portion 117 extending from 116 toward the second support 113 side.

The upper surface of the first fixing portion 116 or the contact surface of the first clamp 112 is provided with an uneven portion to improve the fixing force on the specimen. It is preferable that the protrusions and the recesses are alternately formed in the direction orthogonal to the direction of the force applied to the specimen so that the uneven portion can provide a stronger fixing force against the load applied to the specimen.

The first specimen support portion 117 has a structure in which a plurality of thick plate-shaped first support pieces 118 are formed at predetermined intervals such that their width directions are oriented up and down.

The first clamp 112 is provided with a first fixing jig 120 which is pushed down by a pressing mechanism 119 that provides various types of operating force, such as manual, electric or fluid. .

The second support 113 is installed to be movable along the guide installed in the base 100, and the second fixing part 122 for fixing the other end of the specimen as the second clamp 114 descends; A second specimen support portion 124 is formed extending from the second fixing portion 122 toward the first support 111 side.

The upper surface of the second fixing part 122 or the contact surface of the second clamp 114 is provided with an uneven portion for improving the fixing force similarly to the first support 111.

Similar to the first specimen support portion 117, the second specimen support portion 124 has a structure in which a plurality of second plate support members 124 having a thick plate shape formed to be oriented up and down at predetermined intervals are provided. Have The second support piece 124 is movably inserted into each space between the first support piece 118 so that an upper surface thereof is coplanar.

Similar to the first clamp 112, the second clamp 114 is lowered by a pressurizing mechanism 119, such as a manual, electric or fluid type, so as to press and fix the second upper surface of the test piece to the second fixing jig 126. ).

On the other hand, a temperature control unit 190 is provided below the first support 111 and the second support 113, in particular below the first specimen support 117 and the second specimen support 124. . The temperature control unit 190 is a heating plate 191 installed in contact with the first specimen support portion 117 and the second specimen support portion 124, the heat transfer heater 192 is installed on the heating plate 191 to generate heat And a cooler 193 installed below the heating plate 191. The heating plate 191 provides heat to the specimen placed on the first specimen support portion 117 and the second specimen support portion 124 according to the heat generated by the heat transfer heater 192, and the cooler 193 is provided therein. A cooling pipe path 194 for circulating and supplying a coolant such as cooling water serves to cool the heat by the heat transfer heater 192.

The dynamic load unit 130 is to provide a load for analyzing the characteristics of the material by applying a tensile force and a compressive force to the specimen fixed between the first support 111 and the second support 113, the hydraulic or electric It can be made of various load-loading devices.

In the illustrated embodiment, the electric structure is illustrated. The illustrated dynamic load unit 130 is a fixed frame 131 fixed to the base 100, a transfer screw 132 installed on the fixed frame 131 is rotated by a motor 133, the transfer screw The connecting bar 135 connected between the horizontal movable panel 134 and the horizontal movable panel 134 and the second specimen support part 124 which are screwed to the 132 and moved according to the rotation of the transfer screw 132. It is configured to include. The first load cell for measuring the load applied between the horizontal movable panel 134 and the second support 113 is installed.

When the static load unit 150 is applied to the tensile force and the compressive force by the dynamic load unit 130 to the specimen disposed on the first specimen support portion 117 and the second specimen support portion 124, By applying a lateral load to prevent lateral deformation of the specimen, in particular, buckling, the support frame 151 installed upright on the base 100, the fixed plate provided on the upper portion of the support frame 151 ( A fluid actuator 153 installed to provide a vertical actuation force to 152, coupled to the fixed plate 152 through a guide bar 154 is installed to be moved up and down and connected to the fluid actuator 153 is connected to the fluid actuator The vertical movable plate 155 which is moved up and down according to the expansion and contraction of 153, coupled to the lower portion of the vertical movable plate 155 to the specimen placed on the first specimen support portion 117 and the second specimen support portion 124. It consists of a pusher 157 is raised / lowered to contact. The pusher 157 is provided with a pushing block 157 at the bottom, the support roller 158 is provided in the lower portion of the pushing block 157 is in contact with the specimen. Between the fluid actuator 153 and the pusher 157 is provided a second load cell for measuring the load applied.

The control unit 170 is a controller for controlling the driving of the motor and the hydraulic system for the operation of the dynamic load unit 130 and the static load unit 150, the display 171 for displaying the operating state of each operation unit Etc., and may include a separate controller and display device, or a PC-based input / output device, or both.

Referring to the operation of the tensile compression test device configured as described above are as follows.

The first support 111 in a state in which the first support piece 118 of the first support 111 and the second support piece 124 of the second support 113 enter and overlap each other and are arranged to overlap each other. And a specimen made of a metal plate on an upper surface of the second support piece 124. When the specimen is disposed, the first clamp 112 and the second clamp 114 are moved downward so that both ends of the specimen are first fixed by the first fixing jig 120 and the second fixing jig 126, respectively. 116 and the second fixing part 122 is fixed.

In addition, the pusher 157 of the static load unit 150 is lowered to contact the upper surface of the specimen. In addition, the electrothermal heater 192 is operated to adjust the temperature of the specimen to meet the required test conditions.

In this state, the dynamic load unit 130 is operated to apply tensile and compressive forces to the specimen. That is, as the motor is driven, the horizontal movable plate 134 moves forward / backward along the transfer screw 132, and the second support 113 connected to the horizontal movable plate 134 clamps one end of the specimen. The tension and compression forces are applied while moving forward and backward.

Accordingly, the tensile and compressive forces applied to the specimen and the strain of the specimen are measured and output by the controller. The measured data may be stored and analyzed through the computer system of the controller, and may be illustrated in a graph or the like.

As described above, according to the specimen clamping structure of the tensile compression test apparatus according to the present invention, since the tensile compression behavior is analyzed in a state in which the specimen is placed horizontally, alignment of the specimen is easier than in the conventional vertical tensile compression test apparatus. Yet accurate alignment is possible. Therefore, the time and effort required for the compression tensile test of the metal material can be reduced, and more accurate test results can be derived.

Furthermore, since the horizontal deformation is prevented by the static load unit 150 when tensile and compressive forces are applied to the specimen, it is possible to prevent the occurrence of errors and failure of the test results due to lateral deformation including buckling of the specimen and to prevent test failure. The accuracy can be further improved. This effect can be further improved by reducing the resistance to horizontal deformation of the specimen by installing a roller 158 on the pusher 157 of the static load unit 150.

In addition, by installing a heater and a cooler under the support for supporting the specimen to quickly and freely adjust the temperature of the specimen, it is possible to more easily and accurately test under various temperature conditions required.

Meanwhile, in the above-described embodiment, the specimen support means has a structure in which the first support piece 118 provided on the side of the first support 111 and the second support piece 124 provided on the side of the second support 113 are overlapped. This is provided, but is not limited to this, the specimen support means may be provided as a single body that is not divided, such as a block shape provided with a support surface for supporting the bottom of the specimen on the top.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

110: specimen support unit
130: dynamic load unit
150: static load unit

Claims (6)

In the tensile compression test apparatus for clamping both sides of the specimen to apply repeated tensile and compressive force, and detect the load and deformation state of the specimen in accordance with the applied tension and compression force,
A specimen supporter supporting the bottom of the specimen so as to be disposed in a horizontal direction;
First clamping means for clamping one side of the specimen placed on the specimen support means;
Second clamping means for clamping the other side of the specimen placed on the specimen support means and installed to be movable in a horizontal direction; And
And a dynamic load unit for moving the second clamping means to apply a tensile or compressive force to the specimen.
Specimen clamping structure of tensile compression tester.
The method of claim 1,
The first clamping means is a first support having a support surface in contact with the bottom surface of the specimen on the upper surface, the first support is provided so as to be elevated to the upper end of the first end of the test piece placed on the first support Including 1 clamp
The second clamping means is installed to be movable along the guide, the second support having a support surface which is in contact with the bottom surface of the specimen on the upper surface, movable together with the second support and elevated on the top of the second support A second clamp which is installed to be capable of pressing and fixing one end of the test piece placed on the second support;
Specimen clamping structure of tensile compression tester.
The method of claim 2,
The specimen supports may be formed by extending the first support side toward the second support side and spaced apart from each other by a plurality of first support pieces, and the second support extending toward the first support side and spaced apart from each other by a predetermined distance. And a plurality of second support pieces inserted movably between the first support pieces.
Specimen clamping structure of tensile compression tester.
The method of claim 1,
Further comprising a static load unit in contact with the upper surface of the specimen disposed on the specimen support to prevent transverse deformation of the specimen
Specimen clamping structure of tensile compression tester.
5. The method of claim 4,
The static load unit includes an actuator installed at the upper side of the specimen support to provide a vertical actuation force, and a pusher connected to the lower portion of the actuator to be lifted / lowered toward the specimen.
Specimen clamping structure of tensile compression tester.
The method of claim 5,
On the lower part of the pusher is installed a support roller in contact with the upper surface of the specimen
Specimen clamping structure of tensile compression tester.

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