CN117147331B - Three-point bending test device and test method suitable for ultrathin brittle material - Google Patents
Three-point bending test device and test method suitable for ultrathin brittle material Download PDFInfo
- Publication number
- CN117147331B CN117147331B CN202311402714.0A CN202311402714A CN117147331B CN 117147331 B CN117147331 B CN 117147331B CN 202311402714 A CN202311402714 A CN 202311402714A CN 117147331 B CN117147331 B CN 117147331B
- Authority
- CN
- China
- Prior art keywords
- pressure head
- positioning
- sample fixing
- point bending
- sample
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 69
- 238000013001 point bending Methods 0.000 title claims abstract description 52
- 239000000463 material Substances 0.000 title claims abstract description 31
- 238000010998 test method Methods 0.000 title claims abstract description 11
- 230000007246 mechanism Effects 0.000 claims abstract description 97
- 210000001503 joint Anatomy 0.000 claims abstract description 6
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 10
- 238000005452 bending Methods 0.000 description 4
- 239000007769 metal material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000005504 petroleum refining Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- 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
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending 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
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
Landscapes
- 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 three-point bending test device and a test method suitable for ultrathin brittle materials, wherein the device comprises a pressure head mechanism, a pressure head pre-positioning mechanism, a sample fixing mechanism and a supporting mechanism; the sample fixing mechanism comprises a fixed guide rail, a movable slide block and a sample fixing piece; the bottom of the fixed guide rail is fixed at the top of the supporting mechanism through a threaded rod; 2 movable sliding blocks are arranged, and the 2 movable sliding blocks are in sliding connection with the fixed guide rail; the sample fixing pieces are arranged in 2 groups, each group is provided with 2 sample fixing pieces, and the 2 groups of sample fixing pieces are respectively arranged at the tops of the 2 movable sliding blocks in a sliding manner; the pressure head prepositioning mechanism comprises 2 prepositioning blocks which are symmetrically arranged and a fixed connecting plate which is arranged on one side of the prepositioning blocks, and the 2 prepositioning blocks form a prepositioning groove in the middle position after being in butt joint fixation; the 2 pre-positioning blocks are respectively arranged on the 2 groups of sample fixing pieces in a sliding way. The device not only can avoid the brittle test sample from being broken in the three-point bending test process, but also ensures the accuracy of the test result.
Description
Technical Field
The invention relates to the technical field of three-point bending test devices, in particular to a three-point bending test device and a three-point bending test method suitable for ultrathin brittle materials.
Background
The three-point bending test is an experimental method for testing bending mechanical properties of metal materials, is mostly used for detecting specifications of related metal material products, the thickness of a sample is usually 10-30 mm, a pre-loading force is firstly applied to press down after a pressure head contacts the sample in the test process, then a test load is applied to load, and the load is unloaded after the test is completed, so that the three-point bending test is suitable for materials with thicker sample thickness and certain toughness, but is not suitable for brittle materials. The brittle material is a material which only generates small deformation under the action of external force, namely breaks the fracture, and if a common three-point bending test device is adopted to test the brittle material, the problem of sample breaking and inaccurate experimental data often occurs. Particularly, for ultra-thin brittle materials with the thickness at the micro-nano level, such as ceramic membranes for treating oily sewage generated in the processes of petroleum exploitation, petroleum refining and the like, electrode plates of solid oxide fuel cells and the like, the sample is easy to break due to the fact that the operation is slightly improper in the sample installation process and the preloading process, so that a test cannot be smoothly carried out, the actual breaking time of the ultra-thin brittle materials in the test loading process is short, invalid data in an obtained load-displacement curve is not easy to judge, the test analysis is extremely inaccurate, and the bending mechanical property of the ultra-thin brittle materials cannot be obtained. Based on the above, we propose a three-point bending test device and a test method suitable for ultrathin brittle materials.
Disclosure of Invention
In order to solve the technical problems, the invention provides the three-point bending test device and the test method suitable for the ultrathin brittle material, which not only can avoid the breakage of the brittle sample in the three-point bending test process, but also can ensure the accuracy of the test result, and can obtain the bending mechanical property of the ultrathin brittle material through the test.
The invention adopts the technical scheme that:
the three-point bending test device suitable for the ultrathin brittle material comprises a pressure head mechanism, a pressure head pre-positioning mechanism, a sample fixing mechanism and a supporting mechanism from top to bottom, wherein the pressure head mechanism and the supporting mechanism are respectively fixed on an upper clamping opening and a lower clamping opening of the three-point bending test machine, the pressure head pre-positioning mechanism is detachably arranged above the sample fixing mechanism, and the bottom of the sample fixing mechanism is fixedly connected with the top of the supporting mechanism;
the sample fixing mechanism comprises a fixed guide rail, a movable slide block and a sample fixing piece; the bottom of the fixed guide rail is fixed at the top of the supporting mechanism through a threaded rod; the number of the movable sliding blocks is 2, and the 2 movable sliding blocks are all positioned above the fixed guide rail and are in sliding connection with the fixed guide rail; the sample fixing pieces are arranged in 2 groups, each group is provided with 2 sample fixing pieces, and the 2 groups of sample fixing pieces are respectively arranged at the tops of the 2 movable sliding blocks in a sliding manner;
the pressure head prepositioning mechanism comprises 2 symmetrically arranged prepositioning blocks and a fixed connecting plate arranged on one side of the prepositioning blocks and used for butt-jointing and fixing the 2 prepositioning blocks, and a prepositioning groove is formed in the middle position after the 2 prepositioning blocks are butt-jointed and fixed; the 2 pre-positioning blocks are respectively arranged on the 2 groups of sample fixing pieces in a sliding manner, and the bottom surfaces of the pre-positioning blocks are not contacted with the top surfaces of the samples; the distance between the bottom surface of the pre-positioning groove and the top surface of the sample is the pre-positioning distance of the pressure head mechanism, and the pre-positioning distance is 1-10 mm.
Further, the pressure head mechanism comprises an upper cylindrical chuck and a pressure head fixed at the bottom of the upper cylindrical chuck through a threaded rod, and the upper cylindrical chuck is fixed at an upper clamping port of the three-point bending testing machine.
Further, the supporting mechanism comprises a lower cylindrical chuck, and the lower cylindrical chuck is fixed at a lower clamping opening of the three-point bending testing machine.
Further, the movable slide block is L-shaped, the top of the L-shaped movable slide block is semicircular, and a matched semicircular groove is formed in the bottom of the sample fixing piece.
Further, a graduated scale is arranged on one side of the 2 moving sliding blocks opposite to each other.
Further, a graduated scale is arranged on one side of the fixed guide rail.
Further, a rectangular groove matched with the sample fixing piece is formed in the bottom of the pre-positioning block.
Further, the pre-positioning distance is 2-3 mm.
The invention also provides a three-point bending test method suitable for the ultrathin brittle material, which is realized by using the three-point bending test device and comprises the following steps:
(1) The pressure head mechanism and the supporting mechanism are respectively fixed on an upper clamping opening and a lower clamping opening of the three-point bending testing machine;
(2) According to the test standard, the positions of the movable sliders on the fixed guide rail in the sample fixing mechanism are adjusted, and the 2 movable sliders are symmetrical relative to the transverse center line of the fixed guide rail;
(3) Placing the sample above the 2 movable sliders, fixing two sides of the sample through 2 groups of sample fixing pieces, and enabling the 2 groups of sample fixing pieces to be symmetrical with respect to the longitudinal center line of the fixed guide rail;
(4) Respectively installing 2 pre-positioning blocks of a pressure head pre-positioning mechanism on one of the sample fixing plates of the 2 groups of sample fixing plates, wherein the bottom surfaces of the pre-positioning blocks are not contacted with the top surfaces of the samples, and after the 2 pre-positioning blocks are in butt joint and fixed by adopting a fixed connecting plate and bolts, a pre-positioning groove is formed in the middle position, and the central line of the pre-positioning groove is aligned with the transverse central line of a fixed guide rail;
(5) Adjusting the position of the sample to align the middle position of the sample with the center line of a pre-positioning groove formed after the 2 pre-positioning blocks are in butt joint and fixed;
(6) Starting the three-point bending testing machine, controlling the pressure head mechanism to descend into a pre-positioning groove of the pressure head pre-positioning mechanism, controlling the pressure head mechanism to stop descending when the bottom of the pressure head contacts with the surface of the pre-positioning groove, and then disassembling and taking down the pressure head pre-positioning mechanism;
(7) And (3) starting the three-point bending testing machine again, controlling the pressure head mechanism to descend to perform three-point bending test on the sample, and obtaining a load-displacement curve.
Further, the loading speed of the pressure head mechanism is 0.01-0.05 mm/min.
The beneficial effects of the invention are as follows:
(1) The three-point bending test device suitable for the ultrathin brittle material provided by the invention has the advantages that the brittle sample is subjected to position determination and fixation through the sample fixing mechanism, the brittle sample is not directly clamped, and the phenomenon that the sample is cracked due to improper operation or excessive force in the process of mounting and fixing the brittle sample can be prevented;
(2) According to the three-point bending test device suitable for the ultrathin brittle material, provided by the invention, the pressure head can be preset by arranging the pressure head preset mechanism, and the distance from the pressure head to the surface of the brittle sample can be preset before the test starts, so that invalid data in an obtained load-displacement curve can be accurately judged in the data processing process, the accuracy of test data is ensured, and further, the bending mechanical property of the ultrathin brittle material is obtained through the test; in addition, through setting up pressure head pre-positioning mechanism, can advance the location to the pressure head, can also effectively shorten test time, improve test efficiency.
Drawings
In order to clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the overall structure of a three-point bending test apparatus of the present invention;
FIG. 2 is an exploded view of the three-point bend test apparatus of the present invention;
FIG. 3 is a schematic structural view of a sample fixing mechanism;
fig. 4 is a schematic structural view of the ram pre-positioning mechanism.
The drawing is marked:
1. a pressure head mechanism; 101. an upper cylindrical chuck; 102. a pressure head;
2. a ram pre-positioning mechanism; 201. a pre-positioning block; 202. fixing the connecting plate; 203. a pre-positioning groove;
3. a sample fixing mechanism; 301. a fixed guide rail; 302. moving the slide block; 303. a sample fixing piece; 304. the connecting slide block; 305. a fastening bolt; 306. a bolt through hole;
4. a support mechanism; 401. and a lower cylindrical chuck.
Detailed Description
The invention provides a three-point bending test device and a test method suitable for ultrathin brittle materials, which are used for making the purposes, technical schemes and effects of the invention clearer and more definite, and are further described in detail below. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1 to 4, the present embodiment provides a three-point bending test apparatus suitable for an ultra-thin brittle material, comprising a indenter mechanism 1, an indenter positioning mechanism 2, a sample fixing mechanism 3 and a supporting mechanism 4 from top to bottom; the pressing head mechanism 1 and the supporting mechanism 4 are respectively fixed on an upper clamping opening and a lower clamping opening of the three-point bending testing machine, the pressing head pre-positioning mechanism 2 is detachably arranged above the sample fixing mechanism 3, and the bottom of the sample fixing mechanism 3 is fixedly connected with the top of the supporting mechanism 4.
Specifically, the press head mechanism 1 is used for pressing down and loading a sample under the drive of a three-point bending tester, and specifically comprises an upper cylindrical chuck 101 and a press head 102 fixed at the bottom of the upper cylindrical chuck 101 through a threaded rod, wherein the upper cylindrical chuck 101 is fixed at an upper clamping opening of the three-point bending tester.
The sample fixing mechanism 3 is for fixing and positioning a sample, and specifically includes a fixed rail 301, a movable slider 302, and a sample fixing piece 303. Wherein, the bottom of the fixed guide rail 301 is fixed on the top of the supporting mechanism 4 through a threaded rod, and a graduated scale is arranged on one side of the fixed guide rail 301; the number of the movable sliders 302 is 2, the movable sliders 302 are L-shaped, the tops of the L-shaped movable sliders 302 are semicircular, graduated scales are arranged on the opposite sides of the 2 movable sliders 302, and the 2 movable sliders 302 are all positioned above the fixed guide rail 301 and are in sliding connection with the fixed guide rail 301; the sample fixing pieces 303 are provided with 2 groups of 2 sample fixing pieces, the bottoms of the sample fixing pieces 303 are provided with semicircular grooves matched with the tops of the L-shaped movable sliding blocks 302, and the 2 groups of sample fixing pieces 303 are respectively arranged on the tops of the 2 movable sliding blocks 302 in a sliding manner.
In addition, in order to ensure that the slide does not occur after the position of the movable slide 302 of the sample fixing mechanism 3 is determined, a connecting slide 304 is further arranged below the movable slide 302, the movable slide 302 is connected with the connecting slide 304 through a fastening bolt 305, and the fastening end of the fastening bolt extends out of the movable slide 302; the fixed rail 301 is provided with an inverted T-shaped chute along the length direction thereof, and the connecting slider 304 is disposed in the inverted T-shaped chute; the front and rear sides of the fixed rail 301 are further provided with elongated holes along the length direction thereof, one end of the connecting slider 304 is provided with a bolt through hole 306, the bolt through hole of the connecting slider is inserted with a bolt, two ends of the bolt extend out of the bolt through hole and the elongated hole, and two ends of the bolt extending out of the elongated hole are fixed by nuts.
The ram pre-positioning mechanism 2 is used for pre-positioning the ram, and specifically comprises 2 pre-positioning blocks 201 which are symmetrically arranged and a fixed connecting plate 202,2 pre-positioning blocks 201 which are arranged on one side of the pre-positioning blocks and used for butt-jointing and fixing the 2 pre-positioning blocks, and a pre-positioning groove 203 is formed in the middle position after the two pre-positioning blocks 201 are butt-jointed and fixed; and the bottoms of the 2 pre-positioning blocks 201 are provided with rectangular grooves matched with the sample fixing pieces 303, so that the 2 pre-positioning blocks 201 are respectively arranged on the sample fixing pieces on one side of the 2 groups of sample fixing pieces 303 in a sliding manner, the bottom surfaces of the pre-positioning blocks 201 are not contacted with the top surfaces of the samples, namely, a certain height is reserved between the pre-positioning blocks and the movable sliding blocks, and after the pre-positioning mechanism is fixedly installed, the distance from the bottom surfaces of the pre-positioning grooves to the top surfaces of the samples forms the pre-positioning distance of the pressure head. For the ultrathin brittle material, the loading speed of the pressure head is set to be 0.01-0.05 mm/min in the three-point bending test process, the pre-positioning distance of the pressure head is set to be 1-10 mm, and the data of the distance can be directly used as invalid data in the data processing process so as to ensure the accuracy of test results; in order to ensure the test efficiency, the pre-positioning distance of the pressure head is preferably set to be 2-3 mm.
The above-mentioned pre-positioning distance H is calculated by the following formula:
H=h 1 +h 2 -t；
wherein h is 1 The first pre-positioning distance between the bottom surface of the pre-positioning block and the top surface of the moving slide block (the first pre-positioning distance is larger than the thickness of the sample), and the first pre-positioning distance is 1-5 mm, preferably 1-2 mm; h is a 2 The second pre-positioning distance is set to be 1-5 mm, preferably 1-2 mm, from the bottom surface of the pre-positioning groove to the bottom surface of the pre-positioning block; t is the sample thickness.
In this embodiment, the support mechanism 4 includes a lower cylindrical chuck 401, the lower cylindrical chuck 401 is fixed to a lower jaw of the three-point bending tester, and the fixing rail 301 of the sample fixing mechanism 3 is fixedly connected to the lower cylindrical chuck 401 of the support mechanism 4 by a bolt.
Based on the three-point bending test device, the test method comprises the following steps:
(1) The pressure head mechanism and the supporting mechanism are respectively fixed on an upper clamping opening and a lower clamping opening of the three-point bending testing machine;
(2) According to the test standard and the sample size, the positions of the movable sliders in the sample fixing mechanism on the fixed guide rail are adjusted, and the 2 movable sliders are symmetrical relative to the transverse center line of the fixed guide rail; in the step, when the position of the movable slide block is adjusted, the fastening bolt is required to be screwed out to a certain height but cannot exceed the bolt hole of the connecting slide block, nuts at two ends of the bolt on the connecting slide block are unscrewed, then the movable slide block is manually slid, the position of the movable slide block is determined according to a graduated scale on the side surface of the fixed guide rail, and then the movable slide block is fixed;
(3) Placing the sample above the 2 movable sliders, fixing two sides of the sample through 2 groups of sample fixing pieces, and enabling the 2 groups of sample fixing pieces to be symmetrical with respect to the longitudinal center line of the fixed guide rail; in the step, the positions of 2 groups of sample fixing sheets can be determined by utilizing a graduated scale on the side surface of the movable slide block so as to ensure that the samples are symmetrical about the longitudinal center line of the fixed guide rail;
(4) Respectively installing 2 pre-positioning blocks of a pressure head pre-positioning mechanism on one of the sample fixing sheets positioned on the same side of the 2 groups of sample fixing sheets, enabling the bottom surfaces of the pre-positioning blocks not to contact with the top surface of the sample, adopting a fixed connecting plate and bolts to butt-fix the 2 pre-positioning blocks, forming a pre-positioning groove in the middle position after the 2 pre-positioning blocks are butt-fixed, and enabling the central line of the pre-positioning groove to be aligned with the transverse central line of the fixed guide rail;
(5) Adjusting the position of the sample to align the middle position of the sample with the center line of a pre-positioning groove formed after the 2 pre-positioning blocks are in butt joint and fixed;
(6) Starting the three-point bending testing machine, controlling the pressure head mechanism to descend into a pre-positioning groove of the pressure head pre-positioning mechanism, controlling the pressure head mechanism to stop descending when the bottom of the pressure head is contacted with the surface of the pre-positioning groove, then disassembling the pressure head pre-positioning mechanism, firstly loosening bolts to disassemble a fixed connecting plate when the pressure head pre-positioning mechanism is disassembled, and then respectively moving and disassembling 2 pre-positioning blocks to the left side and the right side;
(7) And (3) starting the three-point bending testing machine again, controlling the pressure head mechanism to descend to perform three-point bending test on the sample, and obtaining a load-displacement curve.
It should be noted that the parts not described in the present invention can be realized by adopting or referring to the prior art.
It should be understood that the above description is not intended to limit the invention to the particular embodiments disclosed, but to limit the invention to the particular embodiments disclosed, and that the invention is not limited to the particular embodiments disclosed, but is intended to cover modifications, adaptations, additions and alternatives falling within the spirit and scope of the invention.
Claims (8)
1. The three-point bending test device suitable for the ultrathin brittle material is characterized by comprising a pressure head mechanism, a pressure head pre-positioning mechanism, a sample fixing mechanism and a supporting mechanism from top to bottom, wherein the pressure head mechanism and the supporting mechanism are respectively fixed on an upper clamping opening and a lower clamping opening of a three-point bending test machine, the pressure head pre-positioning mechanism is detachably arranged above the sample fixing mechanism, and the bottom of the sample fixing mechanism is fixedly connected with the top of the supporting mechanism;
the sample fixing mechanism comprises a fixed guide rail, a movable slide block and a sample fixing piece; the bottom of the fixed guide rail is fixed at the top of the supporting mechanism through a threaded rod; the number of the movable sliding blocks is 2, and the 2 movable sliding blocks are all positioned above the fixed guide rail and are in sliding connection with the fixed guide rail; the sample fixing pieces are arranged in 2 groups, each group is provided with 2 sample fixing pieces, and the 2 groups of sample fixing pieces are respectively arranged at the tops of the 2 movable sliding blocks in a sliding manner;
the pressure head prepositioning mechanism comprises 2 symmetrically arranged prepositioning blocks and a fixed connecting plate arranged on one side of the prepositioning blocks and used for butt-jointing and fixing the 2 prepositioning blocks, and a prepositioning groove is formed in the middle position after the 2 prepositioning blocks are butt-jointed and fixed; the 2 pre-positioning blocks are respectively arranged on the 2 groups of sample fixing pieces in a sliding manner, and the bottom surfaces of the pre-positioning blocks are not contacted with the top surfaces of the samples; the distance between the bottom surface of the pre-positioning groove and the top surface of the sample is the pre-positioning distance of the pressure head mechanism, and the pre-positioning distance is 1-10 mm;
the movable slide block is L-shaped, the top of the L-shaped movable slide block is semicircular, and the bottom of the sample fixing piece is provided with a matched semicircular groove;
the bottom of the pre-positioning block is provided with a rectangular groove matched with the sample fixing piece.
2. The three-point bending test device for the ultra-thin brittle material according to claim 1, wherein the pressure head mechanism comprises an upper cylindrical chuck and a pressure head fixed at the bottom of the upper cylindrical chuck through a threaded rod, and the upper cylindrical chuck is fixed at an upper clamping port of the three-point bending test machine.
3. The apparatus of claim 1, wherein the support mechanism comprises a lower cylindrical collet secured to a lower jaw of the three-point bend testing machine.
4. The three-point bending test device for ultra-thin brittle materials according to claim 1, wherein the opposite sides of the 2 movable sliders are provided with graduated scales.
5. The three-point bending test device for ultrathin brittle materials according to claim 1, wherein a scale is arranged on one side of the fixed guide rail.
6. The three-point bending test device suitable for the ultrathin brittle material according to claim 1, wherein the pre-positioning distance is 2-3 mm.
7. A three-point bending test method suitable for an ultra-thin brittle material, using the three-point bending test apparatus for an ultra-thin brittle material according to any of claims 1 to 6, comprising the steps of:
(1) The pressure head mechanism and the supporting mechanism are respectively fixed on an upper clamping opening and a lower clamping opening of the three-point bending testing machine;
(2) According to the test standard, the positions of the movable sliders on the fixed guide rail in the sample fixing mechanism are adjusted, and the 2 movable sliders are symmetrical relative to the transverse center line of the fixed guide rail;
(3) Placing the sample above the 2 movable sliders, fixing two sides of the sample through 2 groups of sample fixing pieces, and enabling the 2 groups of sample fixing pieces to be symmetrical with respect to the longitudinal center line of the fixed guide rail;
(4) Respectively installing 2 pre-positioning blocks of a pressure head pre-positioning mechanism on one of the sample fixing plates of the 2 groups of sample fixing plates, wherein the bottom surfaces of the pre-positioning blocks are not contacted with the top surfaces of the samples, and after the 2 pre-positioning blocks are in butt joint and fixed by adopting a fixed connecting plate and bolts, a pre-positioning groove is formed in the middle position, and the central line of the pre-positioning groove is aligned with the transverse central line of a fixed guide rail;
(5) Adjusting the position of the sample to align the middle position of the sample with the center line of a pre-positioning groove formed after the 2 pre-positioning blocks are in butt joint and fixed;
(6) Starting the three-point bending testing machine, controlling the pressure head mechanism to descend into a pre-positioning groove of the pressure head pre-positioning mechanism, controlling the pressure head mechanism to stop descending when the bottom of the pressure head contacts with the surface of the pre-positioning groove, and then disassembling and taking down the pressure head pre-positioning mechanism;
(7) And (3) starting the three-point bending testing machine again, controlling the pressure head mechanism to descend to perform three-point bending test on the sample, and obtaining a load-displacement curve.
8. The three-point bending test method suitable for the ultrathin brittle material according to claim 7, wherein the loading speed of the pressure head mechanism is 0.01-0.05 mm/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311402714.0A CN117147331B (en) | 2023-10-27 | 2023-10-27 | Three-point bending test device and test method suitable for ultrathin brittle material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311402714.0A CN117147331B (en) | 2023-10-27 | 2023-10-27 | Three-point bending test device and test method suitable for ultrathin brittle material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117147331A CN117147331A (en) | 2023-12-01 |
| CN117147331B true CN117147331B (en) | 2024-01-26 |
Family
ID=88884597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311402714.0A Active CN117147331B (en) | 2023-10-27 | 2023-10-27 | Three-point bending test device and test method suitable for ultrathin brittle material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117147331B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06308002A (en) * | 1993-04-23 | 1994-11-04 | Meidensha Corp | Three-point bending jig for small fragile material |
| CN109632526A (en) * | 2019-01-21 | 2019-04-16 | 哈尔滨理工大学 | A kind of novel three point bending test device |
| CN110174315A (en) * | 2019-06-05 | 2019-08-27 | 南京理工大学 | The contactless crack opening displacement measuring device and method of bend fracture test |
| CN209485884U (en) * | 2019-01-21 | 2019-10-11 | 哈尔滨理工大学 | A kind of multifunctional material bend test device |
| CN111579361A (en) * | 2020-06-16 | 2020-08-25 | 天津大学 | Test fixture and method for three-point bending and four-point bending of rock |
| CN113295516A (en) * | 2021-06-30 | 2021-08-24 | 安徽相邦复合材料有限公司 | Centering device and application thereof in bending mechanical property test |
| CN116380635A (en) * | 2023-03-17 | 2023-07-04 | 大连理工大学 | Self-adaptive clamp for bending test of hard and brittle composite material and bending strength detection method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101650225B (en) * | 2009-09-16 | 2011-08-17 | 中国科学院安徽光学精密机械研究所 | Absolute spectral radiance luminance responsivity calibrating system utilizing wide tunable laser |
| CN101881662B (en) * | 2010-06-30 | 2011-12-14 | 中国科学院安徽光学精密机械研究所 | Full-automatic visible short infrared subdivided spectral irradiance meter |
| CN201837458U (en) * | 2010-11-03 | 2011-05-18 | 南京中地仪器有限公司 | Broadband modularization ground object spectrometer |
| CN104316187B (en) * | 2014-11-08 | 2017-07-25 | 中国科学院合肥物质科学研究院 | Big visual field Hyper spectral Imaging difference absorption spectrum instrument spectrum scaling device |
| CN212482692U (en) * | 2020-07-31 | 2021-02-05 | 安徽中科谱锐达光电有限公司 | Broadband direct solar illumination measuring device |
| CN115855881A (en) * | 2022-11-23 | 2023-03-28 | 中国气象局气象探测中心 | Spectroscopic apparatus, method of measuring target reflectivity, and readable storage medium |
-
2023
- 2023-10-27 CN CN202311402714.0A patent/CN117147331B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06308002A (en) * | 1993-04-23 | 1994-11-04 | Meidensha Corp | Three-point bending jig for small fragile material |
| CN109632526A (en) * | 2019-01-21 | 2019-04-16 | 哈尔滨理工大学 | A kind of novel three point bending test device |
| CN209485884U (en) * | 2019-01-21 | 2019-10-11 | 哈尔滨理工大学 | A kind of multifunctional material bend test device |
| CN110174315A (en) * | 2019-06-05 | 2019-08-27 | 南京理工大学 | The contactless crack opening displacement measuring device and method of bend fracture test |
| CN111579361A (en) * | 2020-06-16 | 2020-08-25 | 天津大学 | Test fixture and method for three-point bending and four-point bending of rock |
| CN113295516A (en) * | 2021-06-30 | 2021-08-24 | 安徽相邦复合材料有限公司 | Centering device and application thereof in bending mechanical property test |
| CN116380635A (en) * | 2023-03-17 | 2023-07-04 | 大连理工大学 | Self-adaptive clamp for bending test of hard and brittle composite material and bending strength detection method |
Non-Patent Citations (2)
| Title |
|---|
| ] Mechanical properties and energy response of like rock-sprayed high ductility concrete combined body under smooth and wavy interfaces;Hu Shi;《Construction and Building Materials》;全文 * |
| The three-point bending responses of carbon fiber composite sandwich beams with Y-frame cores at high and low temperatures;Zhou Junmeng;《Thin-Walled Structures》;全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117147331A (en) | 2023-12-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109855957B (en) | Rock three-point bending clamp for size effect test | |
| CN103091163A (en) | Device for measuring elongation and cross section shrink rate of metal stretching sample through fast clamping | |
| KR20090079420A (en) | Bending test apparatus for test piece | |
| CN117147331B (en) | Three-point bending test device and test method suitable for ultrathin brittle material | |
| CN109520826A (en) | A kind of dedicated compression clamp of different length composite material compression sample longitudinal centering positioning | |
| CN109540694B (en) | Prefabricated crack bias three-point bending test device for testing fracture toughness of II type crack | |
| CN112098192A (en) | Clamp and method for testing tensile shear creep of adhesive by cross method | |
| JP2019219235A (en) | Biaxial compression tensile test tool and biaxial compression tensile test method | |
| CN111024492A (en) | Sample clamping device for detecting impact performance of thin plate and test method | |
| CN201780235U (en) | Thin metal board bending test device | |
| CN215598975U (en) | Device for measuring bonding strength of composite board | |
| CN217954097U (en) | Combined clamp for rock test | |
| CN110608834A (en) | Double-shaft prestress applying device capable of avoiding bending stress | |
| CN112255091B (en) | Hardness meter tray for detecting thin steel plate and detection method thereof | |
| CN213748205U (en) | Steel post-fracture gauge length and post-fracture diameter measuring tool | |
| CN108426769A (en) | A kind of metal material micro tensile specimen Mechanics Performance Testing device | |
| CN221174231U (en) | Bending test machine convenient for replacing experimental samples | |
| KR20110008706A (en) | Apparatus for measuring strength of sunlight module using universal testing machine | |
| CN221199242U (en) | Loading device for metal stress corrosion cracking resistance test | |
| CN212008081U (en) | Four-point bending loading device | |
| CN219391921U (en) | Water logging ultrasonic detection device | |
| CN220154163U (en) | Loading device for batch development of stress corrosion tests | |
| CN219416978U (en) | Light-load combined stretching and compressing experimental device | |
| CN220795267U (en) | Clamp for testing conductivity of brittle material | |
| CN114923767B (en) | Electrolytic copper foil online detection device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |