CN107449661B - Rectangular strip thin plate type test piece tensile test clamp - Google Patents
Rectangular strip thin plate type test piece tensile test clamp Download PDFInfo
- Publication number
- CN107449661B CN107449661B CN201710861280.9A CN201710861280A CN107449661B CN 107449661 B CN107449661 B CN 107449661B CN 201710861280 A CN201710861280 A CN 201710861280A CN 107449661 B CN107449661 B CN 107449661B
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- CN
- China
- Prior art keywords
- test piece
- rectangular strip
- end part
- type test
- thin plate
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Classifications
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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
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0423—Chucks, fixtures, jaws, holders or anvils using screws
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Abstract
The invention discloses a tensile test clamp for a rectangular strip sheet test piece, which is characterized in that a hole needs to be formed in the end part of the test piece when the test piece is manufactured, and the distance between the center of the hole and the end part is about 1/8 of the length of the test piece. One end of the pin shaft is required to be provided with a screw cap, the diameter of the other end is changed to be small along the screw rod, so that the screw rod at the end is contracted inwards, and the pin shaft is convenient to penetrate into the clamping plate and the test piece. The bolt and the nut which can be freely disassembled and assembled are matched in the gap space between the end part of the test piece and the inner wall of the clamping part, so that the axle center of the test piece is pulled in the stretching process, the sliding phenomenon can not occur, the inner wall of the clamping part can not be touched, and the steel sheets are respectively stuck to the two ends of the test piece for encryption treatment by utilizing epoxy resin glue. If the tensile property of the rectangular strip sheet type test piece is measured under the high temperature condition, the steel mesh can be used for reinforcing the test piece at the position 1/4 of the position away from the end part of the test piece when the test piece is poured, the test result is accurate and reliable, and meanwhile, the clamp is simple in structure, convenient to manufacture, convenient to clamp and low in cost.
Description
Technical Field
The invention relates to a clamp used in a tensile property measuring technology of a rectangular strip sheet type test piece, which can be used for a tensile test of concrete or cement-based materials, can ensure that the axis of the test piece is pulled, and can ensure that the end part of the test piece is not broken or destroyed, in particular to a test piece clamp used in the tensile property measuring technology under a high-temperature condition.
Background
In recent years, more and more people begin to research the tensile property of concrete materials, and generally, the tensile property of the concrete materials is measured, and the aspect ratio of a test piece needs to satisfy a ratio relationship of about 2:1, so that the tensile test can be more easily realized.
In tensile testing of test pieces, the main difficulty is in clamping the test pieces. If the clamping plate is used for clamping the test piece, the test piece is easy to generate stress concentration by utilizing friction force transmission between the test piece and the clamping plate, and fracture can be caused to occur at the clamping part of the test piece; if the bonding force between the epoxy resin and the test piece is utilized to transfer force, the phenomenon of uneven stress can be generated, the epoxy resin glue can be melted under the high-temperature condition, and the material cannot be subjected to a tensile test under the coupling action of high-temperature and tensile stress; if the screw connection is adopted, the processing procedure becomes more complicated, and voids are often unavoidable. Therefore, the existing clamps used for the tensile test of the concrete materials have the defects of complex structure, inconvenient clamping and the like, and the defects are likely to cause failure of the tensile test.
Along with the deep research, the requirements on the test clamp are higher and higher, in order to improve the situation, the rectangular strip sheet-type test piece is reformed, holes are formed at the end parts of the test piece, the steel mesh is used for reinforcing the position of 1/4 of the end parts of the test piece, the tensile property of the end parts is improved, the end parts of the test piece cannot be broken in tension, and the tensile fracture is ensured to occur in the effective length range of the test piece.
The clamp disclosed by the invention considers that the load acting line and the axis of the tensile test piece are on the same straight line as far as possible, so that a bolt and a nut can be inserted between the inner wall of the clamp plate and the test piece, the test piece and the clamp plate can be fixed by rotating the adjusting nut, the axial tension of the test piece in the tensile process is ensured, the phenomena of slippage and lateral bending are avoided, the test result is more accurate and reliable, the clamp is convenient to clamp, the cost is lower, and the clamp is convenient to widely use.
Disclosure of Invention
The invention aims to provide the rectangular strip thin plate type test piece tensile test clamp by improving the defects of the existing tensile clamp, compared with the existing clamp, the clamp can carry out tensile test research under the high-temperature condition, has a simple structure, is convenient to clamp and effectively avoids the phenomena of stress concentration and uneven stress, and has higher practical value.
The technical scheme of the invention is realized specifically as follows:
a tensile test clamp for a rectangular strip-shaped thin plate type test piece comprises an upper clamping part and a lower clamping part.
The upper clamping part comprises an upper connector 1 and an upper clamping plate 2; the lower clamping part comprises a lower connector 7 and a lower clamping plate 8.
The upper connector 1 is connected with the upper end of the tensile testing machine. The lower connector 7 is connected with a lower end base of the tensile testing machine.
The upper connector 1 is connected with the tensile testing machine through a connecting component, and the lower connector 7 is connected with the tensile testing machine through a connecting component, wherein the connecting component comprises a bolt and a nut 3, a pin shaft 4 and a steel mesh 5.
The end part of the rectangular strip sheet-type test piece 6 is provided with a hole, and the length of the center of the hole from the end part of the test piece is 1/8 of the length of the rectangular strip sheet-type test piece; in the pouring process of the rectangular strip sheet type test piece 6, three layers of steel mesh pieces 5 are arranged inside two ends, and the steel mesh pieces 5 penetrate deep into the position 1/4 of the length of the rectangular strip sheet type test piece 6.
The steel mesh 5 at the end part of the rectangular strip sheet type test piece 6 is fixed with the upper connector 1 and the upper clamping plate 2 in longitudinal height through the bolts and nuts 3.
The pin shaft 4 is matched with a hole at the end part of the rectangular strip sheet type test piece 6 to finish transverse connection between the upper connector 1 and the tensile testing machine and between the lower connector 7 and the tensile testing machine.
One end of the pin shaft 4 is provided with a screw cap, the main body of the pin shaft 4 is a screw rod, and the axial dimension of the screw rod is of a gradually-reduced gradual change structure, so that the pin shaft 4 can conveniently penetrate into the upper clamping plate 2, the rectangular strip sheet-shaped test piece 6, the lower clamping plate 8 and the rectangular strip sheet-shaped test piece 6.
The rectangular strip sheet-type test piece 6 is made of a fiber concrete material or a cement-based composite material.
The outer surface of the end part of the rectangular strip sheet-type test piece 6 is stuck with a steel sheet through epoxy resin, so that the end part is prevented from being pulled and broken.
The bolt and nut 3 which can be freely disassembled and assembled are assembled in the gap space between the inner wall of the clamping plate and the end part of the test piece, so that the test piece is prevented from slipping in the stretching process and touching the inner wall of the clamping plate.
The lower connector is connected with the base through a tightening bolt.
The technical scheme can be seen that: in the rectangular strip sheet type test piece clamp, the end part of the test piece is reinforced by the steel mesh sheet, so that the test piece can be subjected to tensile property test research under the high-temperature condition. Compared with the existing clamps at home and abroad, the clamp is simple in structure, the fact that the axle center of the test piece is pulled does not slide is guaranteed, the test piece is directly sleeved when being clamped, the test piece is fixed by the aid of the pin shaft and the bolt and the nut, the clamp is quite convenient to install, and accuracy and reliability of measured data are effectively improved.
Drawings
FIG. 1 is an overall schematic view of a rectangular strip sheet test piece tensile test fixture.
FIG. 2 is a left side view of a rectangular strip sheet test piece tensile test fixture.
FIG. 3 is a schematic view of the upper joint and upper clamping plate in the tensile test fixture for rectangular strip sheet test pieces.
FIG. 4 is a left side view of the upper joint and upper clamping plate in the rectangular strip sheet test piece tensile test fixture.
Fig. 5 is a schematic view of bolts and nuts for fixing a test piece and the inner wall of a clamping plate in the tensile test clamp for a rectangular strip-shaped thin plate type test piece.
FIG. 6 is a schematic view of a pin in a tensile test fixture for a rectangular elongated sheet-type test piece.
Fig. 7 is a three-view of a rectangular long sheet-type test piece.
FIG. 8 is a schematic view of a bolt attached to a base in a rectangular elongated sheet-type specimen tensile test fixture.
FIG. 9 is a top view of a bolt attached to a base in a rectangular elongated sheet-type specimen tensile test fixture.
FIG. 10 is a three-view of the lower connector and lower clamping plate in the tensile test fixture for rectangular strip sheet test pieces.
In fig. 1: 1-upper connector, 2-upper clamping plate, 3-bolt and nut, 4-pin shaft, 5-steel net sheet, 6-rectangular long strip sheet type test piece, 7-lower connector and 8-lower clamping plate
Detailed Description
In order that the above-recited features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof.
FIG. 1 is a schematic view showing the whole of a tensile test fixture for a rectangular strip sheet-type test piece according to the present invention.
Specification of the instron high speed dynamic loading system: the parameters of VHS 160/100-20 are as follows:
four-column frame: 1000KN; maximum dynamic load: 160KN; maximum test impact load: 100KN; total stroke of piston: 300mm; maximum tensile (compression) impact speed: 20m/s.
The fixture needs to be matched with an upper end connector of an instrument, and the upper end connector of the fixture is set to be M48x2mm and the thread depth is 40mm through data measurement. If the dimensions of the tensile test piece are: 300x75x20mm, the diameter of the hole at the end of the test piece is 20mm, and the distance between the center of the hole on the test piece and the end is 1/8 of the length of the test piece, namely 37.5mm. The effective length of the test piece was set to 150mm.
The thickness of the clamping part of the upper clamping plate and the lower clamping plate is set to be 20mm, the gap between the clamping plates is 30mm, gaps of 2.5mm are reserved on two sides of the inner wall of the clamping part of the test piece and the clamping plates respectively, if the test is performed at normal temperature, a steel sheet with the thickness of 75mm x75mm and 75x2mm can be bonded by epoxy resin glue in the range of 75mm x75mm of the end part of the test piece, a hole of 16mm is formed in the center of the steel sheet, and thus a stretched contact surface is arranged on the steel sheet and is used for transmitting force to the test piece through the steel sheet, so that the damage condition of the end part of the test piece is avoided.
If the tensile test research is to be carried out under the high-temperature condition, the steel mesh sheets can be inserted into the end parts of the test pieces in the test piece manufacturing process, three layers of steel mesh sheets are uniformly arranged in the test pieces, and the steel mesh sheets are 75mm in length and 75mm in width.
The diameter of the nut of the pin shaft is set to be 28mm, the thickness of the nut is 2.5mm, the length of the screw is 80mm, the diameter of the screw is 20mm, the end head of the screw is required to shrink slightly inwards (shrink inwards at the position 4mm away from the end head, the shrink angle is 15 degrees), and the pin shaft is convenient to insert into a clamping plate and a test piece.
When the diameter of the hole of the base is 18mm, the lower clamping part can be connected with the base by using a bolt M16 with the length of 80 mm.
In the experimental process, the upper joint 1 and the lower joint bolt 7 are respectively connected with a tensile testing machine and a base, a test piece is aligned with holes of the upper clamping plate 2 and the lower clamping plate 8, the test piece is fixed on a clamp by a pin shaft 4, and in order to prevent the test piece from sliding left and right, a bolt and nut 3 with the height of 50mm is arranged in a gap between the test piece and the inner wall of the clamping plate for combination, and all preparations are proper, so that the test can be started.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.
Claims (2)
1. A rectangular strip thin plate type test piece tensile test fixture is characterized in that: the tensile test clamp comprises an upper clamping part and a lower clamping part;
the upper clamping part comprises an upper connector (1) and an upper clamping plate (2); the lower clamping part comprises a lower connector (7) and a lower clamping plate (8);
the upper connector (1) is connected with the upper end of the tensile testing machine; the lower connector (7) is connected with a lower end base of the tensile testing machine;
the upper connector (1) is connected with the tensile testing machine and the lower connector (7) is connected with the tensile testing machine through a connecting component, and the connecting component comprises a bolt and a nut (3), a pin shaft (4) and a steel mesh sheet (5);
the end part of the rectangular strip thin plate type test piece (6) is provided with a hole, and the length of the center of the hole from the end part of the test piece is 1/8 of the length of the rectangular strip thin plate type test piece; in the pouring process of the rectangular strip sheet type test piece (6), three layers of steel mesh pieces (5) are arranged inside two ends, and the steel mesh pieces (5) penetrate deep to the position 1/4 of the length of the rectangular strip sheet type test piece (6);
the steel mesh (5) at the end part of the rectangular strip thin plate type test piece (6) is fixed with the upper connector (1) and the upper clamping plate (2) in longitudinal height through bolts and nuts (3);
the pin shaft (4) is matched with a hole at the end part of the rectangular strip thin plate type test piece (6) to finish transverse connection between the upper connector (1) and the tensile testing machine and between the lower connector (7) and the tensile testing machine;
a screw cap is arranged at one end part of the pin shaft (4), the main body of the pin shaft (4) is a screw rod, and the axial dimension of the screw rod is of a gradually-changed structure which is gradually reduced, so that the pin shaft (4) can conveniently penetrate into the upper clamping plate (2) and the rectangular strip thin plate type test piece (6) and the lower clamping plate (8) and the rectangular strip thin plate type test piece (6);
the rectangular strip thin plate type test piece (6) is made of fiber concrete materials or cement-based composite materials.
2. The rectangular strip sheet test piece tensile test fixture of claim 1, wherein: the outer surface of the end part of the rectangular strip thin plate type test piece (6) is stuck with a steel sheet through epoxy resin, so that the end part is prevented from being pulled and broken.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710861280.9A CN107449661B (en) | 2017-09-21 | 2017-09-21 | Rectangular strip thin plate type test piece tensile test clamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710861280.9A CN107449661B (en) | 2017-09-21 | 2017-09-21 | Rectangular strip thin plate type test piece tensile test clamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107449661A CN107449661A (en) | 2017-12-08 |
| CN107449661B true CN107449661B (en) | 2023-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710861280.9A Active CN107449661B (en) | 2017-09-21 | 2017-09-21 | Rectangular strip thin plate type test piece tensile test clamp |
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| CN (1) | CN107449661B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108918256A (en) * | 2018-05-24 | 2018-11-30 | 郑州大学 | High-hardness stainless steel fringe enhances ECC direct tensile test fixture and test method |
| CN109187173B (en) * | 2018-09-05 | 2023-08-22 | 华南理工大学 | Auxiliary clamp for hydrogel tensile test and application method thereof |
| CN111289327A (en) * | 2020-03-16 | 2020-06-16 | 烟台宏远氧业股份有限公司 | Resin film test piece for DMA (direct memory Access) test and preparation method thereof |
| CN112359182B (en) * | 2020-11-09 | 2021-08-20 | 燕山大学 | Make things convenient for high temperature singly to draw sample quenching treatment's anchor clamps |
| CN113125269B (en) * | 2021-06-21 | 2021-09-03 | 江西江铃专用车辆厂有限公司 | Device for detecting performance of all-aluminum lightweight container board and using method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06109609A (en) * | 1992-09-24 | 1994-04-22 | Nissan Motor Co Ltd | Chucking jig for biaxial tensile test of thin-plate material and biaxial tensile test method |
| CN101650283A (en) * | 2009-09-11 | 2010-02-17 | 北京工业大学 | Mould for forming axial tensile-strength test piece of cement-based material and test method |
| CN102507317A (en) * | 2011-10-21 | 2012-06-20 | 江苏博特新材料有限公司 | Embedded concrete limit tension test device and concrete sample reinforcing method |
| CN205067219U (en) * | 2015-10-12 | 2016-03-02 | 扬州大学 | ECC axial tension anchor clamps |
| CN207163818U (en) * | 2017-09-21 | 2018-03-30 | 北京工业大学 | A kind of rectangular slat sheet-type test specimen tensile test fixture |
-
2017
- 2017-09-21 CN CN201710861280.9A patent/CN107449661B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06109609A (en) * | 1992-09-24 | 1994-04-22 | Nissan Motor Co Ltd | Chucking jig for biaxial tensile test of thin-plate material and biaxial tensile test method |
| CN101650283A (en) * | 2009-09-11 | 2010-02-17 | 北京工业大学 | Mould for forming axial tensile-strength test piece of cement-based material and test method |
| CN102507317A (en) * | 2011-10-21 | 2012-06-20 | 江苏博特新材料有限公司 | Embedded concrete limit tension test device and concrete sample reinforcing method |
| CN205067219U (en) * | 2015-10-12 | 2016-03-02 | 扬州大学 | ECC axial tension anchor clamps |
| CN207163818U (en) * | 2017-09-21 | 2018-03-30 | 北京工业大学 | A kind of rectangular slat sheet-type test specimen tensile test fixture |
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| CN107449661A (en) | 2017-12-08 |
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