CN112362467A - Plate-shaped sample centering device and centering structure for high-frequency fatigue test - Google Patents
Plate-shaped sample centering device and centering structure for high-frequency fatigue test Download PDFInfo
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- CN112362467A CN112362467A CN202011250221.6A CN202011250221A CN112362467A CN 112362467 A CN112362467 A CN 112362467A CN 202011250221 A CN202011250221 A CN 202011250221A CN 112362467 A CN112362467 A CN 112362467A
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- fatigue test
- frequency fatigue
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- wedge
- centering
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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
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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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
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
-
- 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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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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
- G01N2203/02—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
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
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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 relates to the field of high-frequency fatigue test equipment, in particular to a high-frequency fatigue test plate-shaped sample centering device and a centering structure, which can quickly realize accurate positioning of a sample so as to improve test efficiency and test accuracy. The invention is particularly suitable for centering operation of the plate-shaped test sample in the high-frequency fatigue test.
Description
Technical Field
The invention relates to the field of high-frequency fatigue test equipment, in particular to a centering device and a centering structure for a plate-shaped sample for a high-frequency fatigue test.
Background
Fatigue and fracture are the leading causes of failure in engineered structures and components. Parameters such as S-N curve, fatigue limit and the like of the material can be obtained through a fatigue test, and the parameters can be used for structural CAE durability analysis. In the fatigue test process, the centering condition of the sample and the wedge-shaped clamping surface of the fatigue testing machine directly influences the accuracy of the test result. In the prior art, a plate-shaped sample is centered mostly by adopting a manual visual inspection mode. The manual visual inspection of the centering depends on the skill level of a human, and has great uncertainty. Some testing machines achieve centering by arranging an L-shaped positioning device on the clamping surface. However, in each test, the device needs to be fixed on the corresponding scale at the top of the wedge-shaped clamping surface by using a bolt through visual inspection, and the bolt needs to be loosened and detached before the test, otherwise, the device can interact with a test sample during the test, so that the L-shaped device is deformed, and the result of the test sample can be influenced to a certain extent. At present, no technical scheme for better solving the problems exists in the market.
Disclosure of Invention
The invention aims to solve the technical problem of providing a centering device and a centering structure for a high-frequency fatigue test plate-shaped sample, which can quickly realize accurate positioning of the sample so as to improve the test efficiency and the test accuracy.
The technical scheme adopted by the invention for solving the technical problems is as follows: high frequency fatigue test plate sample centering device, including the dead lever, be provided with the fixed block of through-hole, in pairs all be provided with the centre gripping arm of centre gripping arm through-hole to and in pairs all be provided with the spacing slider of spacing slider through-hole, the fixed block sets up between the centre gripping arm, and the centre gripping arm sets up between spacing slider, all be provided with the dead lever in through-hole, centre gripping arm through-hole and the spacing slider through-hole of fixed block.
Further, the device comprises a pair of long springs, and the limiting sliding blocks are connected with the fixed blocks through the long springs.
Further, the clamping device comprises at least one pair of short springs, and the clamping arms are connected with the fixed block through the short springs.
Furthermore, detachable connecting structures are arranged between the clamping arm and the fixed rod as well as between the limiting sliding block and the fixed rod.
Further, the fixed block is fixedly arranged at the middle point of the fixed rod.
Further, the clamping arm is provided with an inclined groove.
Further, the plate-shaped sample centering structure for the high-frequency fatigue test comprises wedge-shaped clamping surfaces, the wedge-shaped clamping surfaces are arranged between the limiting slide blocks, the outer side edges of the wedge-shaped clamping surfaces are tightly attached to the inner side edges of the limiting slide blocks, and the middle points of connecting lines between the clamping arms and the middle points of the gaps of the wedge-shaped clamping surfaces are arranged in a coplanar manner.
Furthermore, the direction of the gap of the wedge-shaped clamping surface is parallel to the direction of the fixing rod.
The invention has the beneficial effects that: when the device is used actually, a sample is firstly clamped through the clamping arms, then the wedge-shaped clamping surfaces are arranged between the limiting sliding blocks, the outer sides of the wedge-shaped clamping surfaces are tightly attached to the inner sides of the limiting sliding blocks, the clamping arms are consistent in thickness and located on two sides of the fixing block, when the clamping arms clamp the sample, and the limiting sliding blocks clamp the clamping arms and the wedge-shaped clamping surfaces, the middle points of the connecting lines between the clamping arms and the middle points of the seams of the wedge-shaped clamping surfaces can only be arranged in a coplanar mode, namely the sample is located at the centering position, so that the rapid positioning is realized, the centering precision of the device is high, and the uncertainty caused. The device can be directly used on the wedge-shaped clamping surface of the existing fatigue testing machine, and does not need to process the original clamp or the clamping surface. Meanwhile, the device is suitable for samples of different specifications and sizes and wedge-shaped clamping blocks of different sizes, and is wide in application range. In addition, the device is simple to use and disassemble, the installation and the disassembly are realized without screwing the bolt, and the test process is not influenced. The invention is particularly suitable for centering operation of the plate-shaped test sample in the high-frequency fatigue test.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is an exploded view of the present invention.
Fig. 3 is a schematic structural view of the fixing bar of the present invention.
Fig. 4 is a schematic structural view of the fixing block of the present invention.
Fig. 5 is a schematic view of the structure of the clamp arm of the present invention.
Fig. 6 is a schematic structural diagram of the limit slider of the present invention.
Fig. 7 is a schematic view of the structure of the present invention in practical use.
FIG. 8 is a schematic view of the structure of a sample held by the present invention.
FIG. 9 is a schematic view of the wedge-shaped clamping surface of the present invention.
Labeled as: the device comprises a fixing rod 1, a fixing block 2, a clamping arm 3, an inclined groove 31, a clamping arm through hole 32, a limiting slide block 4, a limiting slide block through hole 41, a long spring 5, a short spring 6, a sample 7, a wedge-shaped clamping surface 8 and a centering device 9.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The plate-shaped sample centering device for the high-frequency fatigue test comprises a fixing rod 1, a fixing block 2 provided with a through hole, clamping arms 3 provided with clamping arm through holes 32 in pairs and limiting sliders 4 provided with limiting slider through holes 41 in pairs, wherein the fixing block 2 is arranged between the clamping arms 3, the clamping arms 3 are arranged between the limiting sliders 4, and the fixing rod 1 is arranged in the through hole, the clamping arm through holes 32 and the limiting slider through holes 41 of the fixing block 2.
As shown in fig. 1, it is generally preferable that the fixing block 2, the holding arm 3, and the stopper slider 4 have a rectangular parallelepiped shape as a whole. When the centering device is clamped on the wedge-shaped clamping surfaces 8, the wedge-shaped clamping surfaces 8 are arranged between the limiting slide blocks 4, the outer side edges of the wedge-shaped clamping surfaces 8 are tightly attached to the inner side edges of the limiting slide blocks 4, and the middle points of the connecting lines between the clamping arms 3 and the middle points of the gaps of the wedge-shaped clamping surfaces 8 are arranged in a coplanar manner. Preferably, the direction of the gap of the wedge-shaped clamping surface 8 is parallel to the direction of the fixing rod 1. The clamping arm 3 clamps the sample 7, the limiting slide block 4 clamps the clamping arm 3 and the outer side edge of the wedge-shaped clamping surface 8, at the moment, the sample 7 is just positioned at the middle position, namely the middle point of a connecting line between the clamping arms 3 and the middle point of a crack of the wedge-shaped clamping surface 8 are arranged in a coplanar manner. Due to the existence of the limiting slider through hole 41 and the clamping arm through hole 32, the limiting slider 4 and the clamping arm 3 can slide along the fixing rod 1. Generally, in order to ensure the accuracy of the centering, the fixing block 2 is preferably fixedly arranged at the midpoint of the fixing rod 1.
In order to improve the convenience degree of the limiting slide block 4 in use, the following scheme can be selected: the device comprises a pair of long springs 5, and the limiting sliding blocks 4 are connected with the fixed block 2 through the long springs 5. As shown in fig. 1 and 2, the long springs 5 are of the same length, so that the limiting slide block 4 is subjected to the same tension when being pulled apart towards two outer sides, and the distance between the limiting slide block 4 and the fixed block 2 is ensured to be consistent all the time. Based on the same concept, in order to improve the convenience of the holding arm 3 in use, such a scheme may be selected: the clamping device comprises at least one pair of short springs 6, and the clamping arm 3 is connected with the fixed block 2 through the short springs 6. Thus, the center point of the connecting line between the clamping arms 3 is coplanar with the central axis of the fixing block 2 in the vertical direction, and the centering of the sample 7 clamped by the clamping arms 3 is ensured.
In practical use, in order to enable the plate-shaped sample centering device for the high-frequency fatigue test to flexibly adapt to the wedge-shaped clamping surfaces 8 with different dimensions, and thus increase the use range, detachable connection structures are preferably arranged between the clamping arm 3 and the fixed rod 1, and between the limiting slide block 4 and the fixed rod 1. Due to the structural design, the proper clamping arm 3 and the proper limiting slide block 4 can be replaced according to the size of the wedge-shaped clamping surface 8, so that the centering operation under different application conditions can be flexibly realized.
In order to ensure stability when the holding arm 3 holds the sample 7, it is preferable to provide the holding arm 3 with a slope groove 31 to ensure stability when holding.
Claims (8)
1. High frequency fatigue test plate sample centering device, its characterized in that: including dead lever (1), be provided with fixed block (2) of through-hole, in pairs all be provided with centre gripping arm (3) of centre gripping arm through-hole (32) to and in pairs all be provided with spacing slider (4) of spacing slider through-hole (41), fixed block (2) set up between centre gripping arm (3), and centre gripping arm (3) set up between spacing slider (4), all be provided with dead lever (1) in through-hole, centre gripping arm through-hole (32) and the spacing slider through-hole (41) of fixed block (2).
2. The plate-like specimen centering device for high frequency fatigue test according to claim 1, characterized in that: the device comprises paired long springs (5), and the limiting sliding blocks (4) are connected with the fixed blocks (2) through the long springs (5).
3. The plate-like specimen centering device for high frequency fatigue test according to claim 1, characterized in that: the clamping device comprises at least one pair of short springs (6), and the clamping arms (3) are connected with the fixed block (2) through the short springs (6).
4. The centering device for the high-frequency fatigue test plate-like test piece according to claim 1, 2 or 3, wherein: the clamping arm (3) and the limiting slide block (4) are detachably connected with the fixed rod (1).
5. The centering device for the high-frequency fatigue test plate-like test piece according to claim 1, 2 or 3, wherein: the fixing block (2) is fixedly arranged at the midpoint of the fixing rod (1).
6. The centering device for the high-frequency fatigue test plate-like test piece according to claim 1, 2 or 3, wherein: the clamping arm (3) is provided with an inclined groove (31).
7. The centering structure formed by the centering device for the plate-shaped test piece for the high-frequency fatigue test according to claim 1, wherein: the clamping device comprises wedge-shaped clamping surfaces (8), wherein the wedge-shaped clamping surfaces (8) are arranged between limiting sliding blocks (4), the outer side edges of the wedge-shaped clamping surfaces (8) are tightly attached to the inner side edges of the limiting sliding blocks (4), and the middle points of connecting lines between clamping arms (3) and the middle points of gaps of the wedge-shaped clamping surfaces (8) are arranged in a coplanar manner.
8. The high frequency fatigue test plate specimen centering structure according to claim 7, wherein: the direction of the gap of the wedge-shaped clamping surface (8) is parallel to the direction of the fixed rod (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011250221.6A CN112362467A (en) | 2020-11-10 | 2020-11-10 | Plate-shaped sample centering device and centering structure for high-frequency fatigue test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011250221.6A CN112362467A (en) | 2020-11-10 | 2020-11-10 | Plate-shaped sample centering device and centering structure for high-frequency fatigue test |
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| Publication Number | Publication Date |
|---|---|
| CN112362467A true CN112362467A (en) | 2021-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011250221.6A Pending CN112362467A (en) | 2020-11-10 | 2020-11-10 | Plate-shaped sample centering device and centering structure for high-frequency fatigue test |
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| CN (1) | CN112362467A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114062119A (en) * | 2021-11-12 | 2022-02-18 | 成都先进金属材料产业技术研究院股份有限公司 | High-frequency fatigue test sheet sample buckling prevention device and method |
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| CN104048875A (en) * | 2014-04-24 | 2014-09-17 | 西南交通大学 | Fixture for crack growth curve test and fatigue test |
| US20160231211A1 (en) * | 2015-02-09 | 2016-08-11 | Sichuan University | Device for fixing rock samples |
| CN207866637U (en) * | 2018-03-05 | 2018-09-14 | 中冶赛迪工程技术股份有限公司 | A kind of steel plate shearing performance testing device |
| CN208366714U (en) * | 2018-07-16 | 2019-01-11 | 天津市懿峰工贸有限公司 | One kind suppressing experiment clamp device |
| CN109187176A (en) * | 2018-10-23 | 2019-01-11 | 上海工程技术大学 | A kind of test fixture and centering clamping method of centering clamping plate tensile sample |
| CN109900567A (en) * | 2019-04-11 | 2019-06-18 | 盛柏儒 | A kind of fixture and fatigue rig |
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| CN111721625A (en) * | 2020-06-05 | 2020-09-29 | 成都先进金属材料产业技术研究院有限公司 | High-speed tensile sample centering device and method |
| CN111721626A (en) * | 2020-04-22 | 2020-09-29 | 成都先进金属材料产业技术研究院有限公司 | Strain gauge setting method and device in high-speed tensile force measurement of plate |
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2020
- 2020-11-10 CN CN202011250221.6A patent/CN112362467A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104048875A (en) * | 2014-04-24 | 2014-09-17 | 西南交通大学 | Fixture for crack growth curve test and fatigue test |
| US20160231211A1 (en) * | 2015-02-09 | 2016-08-11 | Sichuan University | Device for fixing rock samples |
| CN207866637U (en) * | 2018-03-05 | 2018-09-14 | 中冶赛迪工程技术股份有限公司 | A kind of steel plate shearing performance testing device |
| CN208366714U (en) * | 2018-07-16 | 2019-01-11 | 天津市懿峰工贸有限公司 | One kind suppressing experiment clamp device |
| CN109187176A (en) * | 2018-10-23 | 2019-01-11 | 上海工程技术大学 | A kind of test fixture and centering clamping method of centering clamping plate tensile sample |
| CN209296491U (en) * | 2018-12-19 | 2019-08-23 | 贵州省建材产品质量监督检验院 | A kind of bar bending device for detecting performance |
| CN109900567A (en) * | 2019-04-11 | 2019-06-18 | 盛柏儒 | A kind of fixture and fatigue rig |
| CN111721626A (en) * | 2020-04-22 | 2020-09-29 | 成都先进金属材料产业技术研究院有限公司 | Strain gauge setting method and device in high-speed tensile force measurement of plate |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114062119A (en) * | 2021-11-12 | 2022-02-18 | 成都先进金属材料产业技术研究院股份有限公司 | High-frequency fatigue test sheet sample buckling prevention device and method |
| CN114062119B (en) * | 2021-11-12 | 2024-04-30 | 成都先进金属材料产业技术研究院股份有限公司 | Buckling-restrained device and method for high-frequency fatigue test sheet sample |
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Application publication date: 20210212 |