CN112362469A - Small punch test device - Google Patents
Small punch test device Download PDFInfo
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- CN112362469A CN112362469A CN202011054768.9A CN202011054768A CN112362469A CN 112362469 A CN112362469 A CN 112362469A CN 202011054768 A CN202011054768 A CN 202011054768A CN 112362469 A CN112362469 A CN 112362469A
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- 238000012360 testing method Methods 0.000 title claims abstract description 57
- 238000006073 displacement reaction Methods 0.000 claims abstract description 57
- 238000009413 insulation Methods 0.000 claims description 8
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims 2
- 238000000034 method Methods 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 abstract description 3
- 230000006835 compression Effects 0.000 description 12
- 238000007906 compression Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 6
- 210000004907 gland Anatomy 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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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
-
- 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
-
- 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
- G01N2203/0019—Compressive
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a small punch test device, wherein an upper pressing die and a lower pressing die are accommodated in a clamp seat, the upper pressing die is positioned on the lower pressing die, a ball pressing head is positioned in the upper pressing die, a punch is movably arranged on the upper pressing die and is abutted against the ball pressing head, the small punch test device also comprises a pressing nut and a sensor mounting structure, a pressing block is abutted against the upper pressing die, the pressing nut is fixedly connected with the clamp seat and presses the pressing block, a displacement sensor is arranged below a sample through the sensor mounting structure and is contacted with the lower surface of the sample to directly measure the deformation of the sample, and through the design, the pressing nut presses the upper pressing die through the pressing block to further fix the sample to ensure that the sample does not rotate and move in the test process; the mounting mode of the displacement sensor overcomes the defects of the prior art for indirectly measuring the deflection displacement of the sample during the small punch test, and can directly measure the deflection displacement of the sample; the whole test device is simple in structure, easy to operate and high in measurement precision of deflection displacement.
Description
Technical Field
The invention relates to a test device, in particular to a small punch test device.
Background
In order to detect the mechanical property degradation of pressure vessel materials, especially reactor pressure vessel materials, with changes in service time, in the last 80 th century, material scientists proposed small punch test methods in an attempt to measure the mechanical properties of materials with a very small number of specimens without compromising the structural integrity.
Through years of research, China in 2012 puts forward a national standard GB/T29459.1-2012 for small punch test: at present, the technology is widely applied to the industries of chemical engineering, nuclear power and the like. According to the standard, a thin wafer sample is compressed between an upper die and a lower die, both of which are provided with a central hole, the lower die having a larger opening than the upper die. The punch rod punches the ball pressure head at a certain speed, and further presses the wafer sample to deform until the sample is broken. The deflection deformation displacement and the load of the sample are measured to obtain a load-displacement curve, and then the mechanical property of the material is calculated according to the load-displacement curve. Obviously, in the small punch test process, the accurate measurement of the deflection displacement of the sample is an important link for ensuring the accuracy of the test result.
In the prior art, an indirect displacement measurement method is generally adopted, a displacement sensor is connected to a punch rod or is arranged on a load sensor, and some displacement sensors are directly arranged on a loading cross beam. In addition, the conventional test device is easy to rotate and move during the test process.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a small punch test device which directly measures the displacement of a sample and does not generate rotary movement of the sample in the test process.
One of the purposes of the invention is realized by adopting the following technical scheme:
the utility model provides a little jumper bar test device, includes anchor clamps seat, stamping die, ball pressure head, jumper bar and displacement sensor, stamping die includes upper die and lower die, upper die and lower die accept in the anchor clamps seat, upper die is located on the lower die, the ball pressure head is located in the upper die, the jumper bar movable mounting in upper die and with the ball pressure head is contradicted, stamping die still includes the briquetting, little jumper bar test device still includes gland nut and sensor mounting structure, the briquetting is supported and is pressed the upper die, gland nut with anchor clamps seat fixed connection compresses tightly the briquetting, displacement sensor passes through sensor mounting structure install in the sample below, displacement sensor and the deformation of sample lower surface contact direct measurement sample.
Further, the displacement sensor is a linear variable differential transducer.
Further, the sensor mounting structure includes a fixing seat and a sensor fastener, the fixing seat is fixed in the fixture seat, the displacement sensor part is accommodated in the fixing seat, the sensor fastener is installed in the fixing seat, the end part of the sensor fastener collides with the displacement sensor to press the displacement sensor to prevent the displacement sensor from being separated from the fixing seat.
Further, the sensor fastener is a screw.
Further, the sensor mounting structure still includes thermal-insulated packing ring, thermal-insulated packing ring install in the fixing base top, thermal-insulated packing ring is equipped with central through-hole, displacement sensor includes the connecting rod, the connecting rod is located in the central through-hole.
Further, the sensor mounting structure comprises a cross beam, the small punch test device comprises a frame, the cross beam is mounted on the frame in a height adjustable mode, and the displacement sensor is fixed to the cross beam.
Further, the sensor mounting structure further comprises a heat insulation gasket, the heat insulation gasket is fixed on the clamp seat, the heat insulation gasket is provided with a central through hole, the displacement sensor comprises a connecting rod, and the connecting rod is located in the central through hole.
Further, the heat insulating gasket is made of polytetrafluoroethylene.
Further, the small punch test device also comprises a frame, and the clamp seat is fixed on the frame.
Further, the ball pressure head is a tungsten carbide steel ball.
Compared with the prior art, the small punch test device also comprises a compression nut and a sensor mounting structure, wherein the pressing block abuts against the upper pressing die, the compression nut is fixedly connected with the clamp seat and compresses the pressing block, the displacement sensor is mounted below the sample through the sensor mounting structure, the displacement sensor is in contact with the lower surface of the sample to directly measure the deformation of the sample, through the design, the compression nut presses the upper pressing die through the pressing block to further fix the sample, so that the sample is ensured not to rotate and move in the test process, and meanwhile, the sample is convenient and simple to assemble and disassemble; the defects of the prior art for indirectly measuring the deflection displacement of the sample in the small punch test are overcome, and the deflection displacement of the sample can be directly measured; the whole testing device is simple in structure, easy to operate and high in deflection displacement measurement precision.
Drawings
FIG. 1 is a schematic structural view of a first embodiment of a small punch test apparatus according to the present invention;
FIG. 2 is an enlarged view of the small punch test apparatus A of FIG. 1;
FIG. 3 is a schematic view of a portion of the small punch test apparatus of FIG. 1;
FIG. 4 is a schematic structural view of a second embodiment of the small punch test device of FIG. 1;
fig. 5 is a schematic structural view of a third embodiment of the small punch test device of fig. 1.
In the figure: 10. a frame; 20. a clamp seat; 21. an external thread; 22. an accommodating space; 30. a stamping die; 31. briquetting; 32. pressing the die; 33. pressing a die; 40. a ball indenter; 50. punching; 60. a compression nut; 70. a displacement sensor; 71. a connecting rod; 80. a sensor mounting structure; 81. a heat insulating gasket; 810. a central through hole; 82. a fixed seat; 83. a sensor fastener; 84. a cross beam; 200. and (4) sampling.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present, secured by intervening elements. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly disposed on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Fig. 1 to 3 are drawings of a first embodiment of a small punch test apparatus of the present invention, which includes a frame 10, a jig base 20, a press die 30, a ball ram 40, a punch 50, a compression nut 60, a displacement sensor 70, and a sensor mounting structure 80.
The lower part of the frame 10 is an open structure, which is easy for installing, debugging and fixing the displacement sensor 70. The lower part of the frame 10 is provided with a positioning pin hole and a locking screw, so that the small punch test device can be conveniently and integrally installed on a universal tester.
The jig base 20 is fixed to the end of the frame 10. The fixture seat 20 has an external thread 21 on the outside and an accommodation space 22 inside.
The press die 30 includes a compact 31, an upper die 32, and a lower die 33. The press block 31, the upper die 32 and the lower die 33 are all cylindrical in shape, and are all provided with center holes. The center hole diameter of the press piece 31 is larger than that of the upper die 32. The center hole diameter of the lower die 33 is larger than that of the upper die 32. The hole diameters of the central holes of the upper die 32 and the lower die 33 meet the GB/T29459.1-2012 requirement.
The ball indenter 40 is a tungsten carbide steel ball. The ball indenter 40 is 2.5 mm in diameter, according to the standard.
The displacement sensor 70 is a Linear Variable Differential Transformer (LVDT) sensor.
The sensor mounting structure 80 includes a thermal insulating washer 81, a fixing seat 82, and a sensor fastener 83. The heat insulating gasket 81 is made of polytetrafluoroethylene. The heat insulating gasket 81 is provided with a central through hole 810. The heat insulating gasket 81 is accommodated in the jig base 20, and the fixing base 82 is fixed to the jig base 20. The end of the fixing seat 82 abuts against the heat insulating gasket 81 so that the heat insulating gasket 81 is mounted on the upper end of the fixing seat 82. The sensor fastener 83 is a screw.
When it is desired to test the test specimen 200, a disc-shaped test specimen 200 is taken, in which the test specimen 200 has a diameter of 10 mm and a thickness of 0.5 mm. The lower die 33, the sample 200, the upper die 32 and the press block 31 are sequentially placed in the accommodating space 22 of the clamp base 20, and the compression nut 60 is tightened to secure the sample 200. At this time, the internal thread of the compression nut 60 is matched with the external thread 21 of the fixture seat 20, and the compression nut 60 passes through the pressing block 31 and the upper pressing die 32 to further fix the sample 200 so as to ensure that the sample 200 does not rotate and move in the test process. Meanwhile, the design of the compression nut 60 enables the operations of installing and clamping the sample 200 and loosening and taking out the sample 200 to be convenient and simple.
And (3) putting the ball pressing head 40 and the punch 50 into the middle hole of the compression nut 60, the central hole of the pressing block 31, the central hole of the upper pressing die 32 and the central hole of the lower pressing die 33 in sequence, and ensuring that the punch 50 presses the ball pressing head 40 and moves smoothly in the holes.
The displacement sensor 70 is placed into the holder 20 from the lower portion of the frame 10 such that the connection rod 71 of the displacement sensor 70 is positioned in the central through hole 810 and the end portion thereof is in light contact with the lower surface of the test specimen 200 (observation of the displacement measurement), the sensor fastening member 83 is locked, the end portion of the sensor fastening member 83 abuts against the displacement sensor 70, and the displacement sensor 70 is prevented from being separated from the holder 20. At this time, the plunger 50, the compression nut 60, the press block 31, the upper die 32, the sample 200, the lower die 33, the jig base 20, and the displacement sensor 70 are coaxially mounted and fixed. All test related parts and test samples 200 are accurately arranged on the clamp seat 20, and the centering requirement of the small punch test is ensured.
A pressurized load is introduced into the ram 50 and the change in load is observed until a slight load is detected, indicating normal loading. And resetting the load and the displacement, setting the loading speed, performing a test, measuring a load-displacement curve, and performing a small punch test.
Little jumper bar test device simple structure in this application, through rotatory gland nut 60 fixed sample 200, convenient operation. The pressing block 31 ensures that the upper pressing die 32 does not rotate along with the compression nut 60, and ensures the fixed state of the sample 200. The displacement sensor 70 is directly contacted with the lower surface of the sample 200 to directly measure the sample deflection of the small punch test, so that the error caused by the deformation of the punch 50 and the ball pressing head 40 in the common punch displacement measuring method is avoided, the direct and accurate measurement of the deflection displacement is realized, and a good foundation is laid for the accurate analysis of the mechanical property of the material.
Referring to fig. 4, it is shown a second embodiment of the small punch test device of the present invention, wherein the structure of the small punch test device is substantially the same as that of the first embodiment, except that: the sensor mounting structure 80 is a cross member 84, the cross member 84 is height-adjustably mounted to the frame 10, and the displacement sensor 70 is fixed to the cross member 84.
Referring to fig. 5, it is shown a third embodiment of the small punch test device of the present invention, wherein the structure of the small punch test device is substantially the same as that of the second embodiment, except that: the sensor mounting structure 80 further includes a heat insulating gasket 81, and the heat insulating gasket 81 is made of polytetrafluoroethylene. The heat insulating washer 81 is fixed to the jig base 20. The heat insulating washer 81 is provided with a central through hole 810, the displacement sensor 70 is fixed to the cross member 84, and the connection rod 71 of the displacement sensor 70 is located in the central through hole 810.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, variations and modifications can be made without departing from the spirit of the invention, and all equivalent modifications and changes can be made to the above embodiments according to the essential technology of the invention, which falls into the protection scope of the invention.
Claims (10)
1. The utility model provides a little jumper bar test device, includes anchor clamps seat, stamping die, ball pressure head, jumper bar and displacement sensor, stamping die includes top die and bed die, its characterized in that: the upper pressing die and the lower pressing die are contained in the clamp seat, the upper pressing die is located on the lower pressing die, the ball pressing head is located in the upper pressing die, the punch rod is movably installed on the upper pressing die and is abutted to the ball pressing head, the punching die further comprises a pressing block, the small punch rod testing device further comprises a pressing nut and a sensor installation structure, the pressing block is abutted to the upper pressing die, the pressing nut is fixedly connected with the clamp seat and presses the pressing block, the displacement sensor is installed below the sample through the sensor installation structure, and the displacement sensor is in contact with the lower surface of the sample to directly measure the deformation of the sample.
2. The small ram test device of claim 1, wherein: the displacement sensor is a linear variable differential transducer.
3. The small ram test device of claim 1, wherein: the sensor mounting structure comprises a fixing seat and a sensor fastener, wherein the fixing seat is fixed on the clamp seat, the displacement sensor part is contained in the fixing seat, the sensor fastener is installed on the fixing seat, the end part of the sensor fastener is abutted against the displacement sensor to prevent the displacement sensor from being compressed and separated from the fixing seat.
4. The small punch test device of claim 3, wherein: the sensor fastener is a screw.
5. The small punch test device of claim 3, wherein: the sensor mounting structure further comprises a heat insulation gasket, the heat insulation gasket is mounted above the fixing seat and provided with a central through hole, the displacement sensor comprises a connecting rod, and the connecting rod is located in the central through hole.
6. The small ram test device of claim 1, wherein: the sensor mounting structure comprises a cross beam, the small punch test device comprises a frame, the cross beam is mounted on the frame in a height adjustable mode, and the displacement sensor is fixed on the cross beam.
7. The small punch test device of claim 6, wherein: the sensor mounting structure further comprises a heat insulation gasket, the heat insulation gasket is fixed on the clamp seat, the heat insulation gasket is provided with a central through hole, the displacement sensor comprises a connecting rod, and the connecting rod is located in the central through hole.
8. The small punch test device of claim 7, wherein: the heat insulating gasket is made of polytetrafluoroethylene.
9. The small ram test device of claim 1, wherein: the small punch test device further comprises a frame, and the clamp seat is fixed on the frame.
10. The small ram test device of claim 1, wherein: the ball pressure head is a tungsten carbide steel ball.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011054768.9A CN112362469A (en) | 2020-09-29 | 2020-09-29 | Small punch test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011054768.9A CN112362469A (en) | 2020-09-29 | 2020-09-29 | Small punch test device |
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| Publication Number | Publication Date |
|---|---|
| CN112362469A true CN112362469A (en) | 2021-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011054768.9A Pending CN112362469A (en) | 2020-09-29 | 2020-09-29 | Small punch test device |
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| CN (1) | CN112362469A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102042939A (en) * | 2010-10-29 | 2011-05-04 | 华东理工大学 | Miniature specimen creep test system and test method |
| CN102621011A (en) * | 2012-03-28 | 2012-08-01 | 天津大学 | Subminiature minimal invasion high-temperature creep fatigue testing machine and application thereof |
| CN105043898A (en) * | 2015-07-13 | 2015-11-11 | 郑州磨料磨具磨削研究所有限公司 | Resin diamond soft polishing pad safety performance testing device and method |
| CN107219116A (en) * | 2017-06-23 | 2017-09-29 | 武汉大学 | The test system of ferroelectric material respondent behavior under the conditions of power electro thermal coupling |
| CN207529247U (en) * | 2017-10-25 | 2018-06-22 | 中航工程集成设备有限公司 | A kind of sensor thermostat measured for aeroengine thrust |
| CN108519225A (en) * | 2018-03-19 | 2018-09-11 | 江苏大学 | A kind of detection device and method of blade of aviation engine high-temperature vibrating fatigue properties |
| CN109507037A (en) * | 2018-10-22 | 2019-03-22 | 西安交通大学 | A kind of small drill drift creepage experimental rig and method that can be achieved precisely continuously to load |
| CN110530752A (en) * | 2019-09-30 | 2019-12-03 | 济南益华摩擦学测试技术有限公司 | A kind of rotation reciprocating friction and wear testing machine |
-
2020
- 2020-09-29 CN CN202011054768.9A patent/CN112362469A/en active Pending
Patent Citations (8)
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|---|---|---|---|---|
| CN102042939A (en) * | 2010-10-29 | 2011-05-04 | 华东理工大学 | Miniature specimen creep test system and test method |
| CN102621011A (en) * | 2012-03-28 | 2012-08-01 | 天津大学 | Subminiature minimal invasion high-temperature creep fatigue testing machine and application thereof |
| CN105043898A (en) * | 2015-07-13 | 2015-11-11 | 郑州磨料磨具磨削研究所有限公司 | Resin diamond soft polishing pad safety performance testing device and method |
| CN107219116A (en) * | 2017-06-23 | 2017-09-29 | 武汉大学 | The test system of ferroelectric material respondent behavior under the conditions of power electro thermal coupling |
| CN207529247U (en) * | 2017-10-25 | 2018-06-22 | 中航工程集成设备有限公司 | A kind of sensor thermostat measured for aeroengine thrust |
| CN108519225A (en) * | 2018-03-19 | 2018-09-11 | 江苏大学 | A kind of detection device and method of blade of aviation engine high-temperature vibrating fatigue properties |
| CN109507037A (en) * | 2018-10-22 | 2019-03-22 | 西安交通大学 | A kind of small drill drift creepage experimental rig and method that can be achieved precisely continuously to load |
| CN110530752A (en) * | 2019-09-30 | 2019-12-03 | 济南益华摩擦学测试技术有限公司 | A kind of rotation reciprocating friction and wear testing machine |
Non-Patent Citations (1)
| Title |
|---|
| M. BRUCHHAUSE ET AL.: "Recent developments in small punch testing: Tensile properties and DBTT", 《THEORETICAL AND APPLIED FRACTURE MECHANICS》 * |
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