CN110618026A - Sample clamping method for testing high-temperature tensile property of metal sheet - Google Patents
Sample clamping method for testing high-temperature tensile property of metal sheet Download PDFInfo
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- CN110618026A CN110618026A CN201910783094.7A CN201910783094A CN110618026A CN 110618026 A CN110618026 A CN 110618026A CN 201910783094 A CN201910783094 A CN 201910783094A CN 110618026 A CN110618026 A CN 110618026A
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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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
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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
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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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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- 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 belongs to the technical field of physical and chemical detection, and particularly relates to a sample clamping method for testing high-temperature tensile property of a metal sheet. Through fixing foraminiferous sheetmetal that will make specially with the pin together with the sheet metal sample and realizing the centre gripping to the sample in wearing the round pin anchor clamps, when high temperature tensile properties tests, the pinhole that the existence of sheetmetal can restrict the sample warp because the atress takes place, make it only can take place the deformation of less degree, the restriction effect combined action of the deformation of less degree and sheetmetal for the bearing capacity at sample pinhole position can improve, can effectively avoid taking place local curling or even tearing problem around the sample pinhole. Compared with other methods, the method has the advantages of simple operation, low cost and the like, and has practical application value.
Description
Technical Field
The invention belongs to the technical field of physical and chemical detection, and particularly relates to a sample clamping method for testing high-temperature tensile property of a metal sheet.
Background
The high-temperature tensile property test is used for testing the tensile mechanical property of the material under the condition higher than room temperature, the test result is an important basis for the material to be used under the high-temperature condition, and the high-temperature tensile property test has very important significance for ensuring the safety and reliability of the product under the use condition.
For the high-temperature tensile property test of the metal plate, the most common clamping method of the plate sample is to fix the plate sample on a pin-through clamp by using pins, which is the mainstream clamping solution provided by various testing machine manufacturers at present and also meets the relevant standards, such as the relevant regulations of GB/T228.2-2015 and HB 5195-. The clamping method has the advantages of low manufacturing difficulty of the clamp, wide application range, convenience in operation and the like. However, in the stretching process, stress concentration occurs due to the small contact area between the pin hole used for fixing at the end of the sample and the pin, and local curling and even tearing occur around the pin hole of the sample in serious cases, so that the validity of test data is affected, and the test fails, and the problem is particularly obvious on a sheet metal sample (generally, a sample with the thickness less than 1 mm). For the problem, two methods are mainly used in the existing chemical detection industry, one method adopts a specially designed clamp, but the method has the problems of high clamp design requirement, complex structure, high processing difficulty, low applicability and the like; another method is to reinforce the end of a thin plate sample, which includes welding thicker plates on both ends of the sample, then punching a hole on the thick plate, fixing the sample through the hole on the thick plate, and riveting a metal sheet with the same diameter hole on both ends of the sample (the pin and the hole of the metal sheet are coaxial with the pin hole of the sample) to reinforce the strength of the end of the sample.
Disclosure of Invention
Technical problem to be solved
The invention provides a sample clamping method for a metal sheet high-temperature tensile property test, which aims to solve the technical problem that when the metal sheet is clamped by a pin-through clamp for the high-temperature tensile property test, pin holes at the end part of the sample are locally curled or even torn, so that the validity of a test result is influenced, and the test result even fails.
(II) technical scheme
In order to solve the technical problem, the invention provides a sample clamping method for a high-temperature tensile property test of a metal sheet, which comprises the following steps:
s1, adopting a metal plate which still keeps higher mechanical property at high temperature, wherein the sum of the thickness of the metal plate and the thickness of the metal sheet to be detected is slightly smaller than the maximum thickness which can be clamped by the pin penetrating clamp;
s2, processing the metal plate into two metal sheets with the same shape as the end part of the metal sheet sample;
s3, processing a hole with the same diameter as the pin hole at the end part of the metal sheet sample at the central part of the metal sheet;
and S4, fixing the metal sheet sample and the perforated metal sheet together in a pin penetrating clamp by using pins to finish clamping the metal sheet sample.
Further, when the testing temperature is not more than 600 ℃, the metal plate is selected from TA15 and Ti60 high-temperature titanium alloy;
further, when the testing temperature is not more than 1000 ℃, the metal plate is made of high-temperature alloy such as GH 4099.
Furthermore, the sum of the thickness of the metal plate and the thickness of the metal sheet to be measured is less than the maximum thickness which can be clamped by the pin penetrating clamp by 0.3-0.8 mm.
Further, the perforated metal sheets at the two ends of the metal sheet sample are positioned on the same side of the metal sheet sample.
(III) advantageous effects
The invention provides a sample clamping method for a metal sheet high-temperature tensile property test, which realizes the clamping of a sample by fixing a specially manufactured perforated metal sheet and a metal sheet sample together in a pin penetrating clamp by using pins.
The perforated metal sheet is simple to process and can be repeatedly used for multiple times, one metal sheet can be suitable for metal sheet samples in a certain specification range, and for a specific pin penetrating clamp, the high-temperature tensile test requirement of the metal sheet samples in the clamping range can be met by only a plurality of (3-5) specifications of metal sheets.
Compared with other methods, the method has the advantages of simple operation, low cost and the like, and has practical application value.
Drawings
FIG. 1 is a schematic view of a high temperature tensile specimen of a metal sheet in an embodiment of the present invention;
FIG. 2 is a schematic view of a perforated metal sheet according to an embodiment of the present invention;
FIG. 3 is a schematic view of clamping a sample of sheet metal in an embodiment of the present invention.
Detailed Description
In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
The embodiment provides a sample clamping method for a high-temperature tensile property test of a metal sheet, which specifically comprises the following steps:
s1, the thickness of the sheet metal sample 1 is measured and recorded as h1(ii) a Measuring the opening width of the pin penetrating clamp 2, namely the maximum thickness of a sample which can be clamped by the pin penetrating clamp, and marking as b;
s2, selecting a plate for processing the metal sheet, wherein the metal plate still can keep high mechanical property under the test temperature condition of the high-temperature tensile property test, GH4099 and other high-temperature alloys can be selected when the test temperature is not more than 1000 ℃, and TA15, Ti60 and other high-temperature titanium alloys can be selected when the test temperature is not more than 600 DEG C(ii) a Second, the thickness h of the metal plate2Thickness h of the sheet metal sample to be measured1The sum of the thicknesses is slightly less than the maximum thickness b which can be clamped by the pin penetrating clamp, and the specific requirements are b-h1-h2＝(0.3～0.8)mm；
S3, according to the shape of the thin metal plate sample, as shown in FIG. 1, 2 pieces of the metal sheet having the same shape as the end portion of the thin metal plate sample are machined from the metal plate material determined in the step S2, and a hole having the same diameter as the pin hole of the end portion of the thin metal plate sample is machined in the center of the 2 pieces of the metal sheet, as shown in FIG. 2.
And S4, fixing the metal sheet sample and the perforated metal sheet 3 together in a pin penetrating clamp by using a pin 4 to complete the clamping of the sample, wherein the metal sheets at the two ends of the metal sheet sample are required to be positioned on the same side of the sample during the clamping as shown in FIG. 3.
Tests show that the method has obvious effect and can effectively avoid the problem that the periphery of the pin hole of the sample is locally curled and even torn.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (5)
1. A sample clamping method for a high-temperature tensile property test of a metal sheet is characterized by comprising the following steps:
s1, adopting a metal plate which still keeps higher mechanical property at high temperature, wherein the sum of the thickness of the metal plate and the thickness of the metal sheet to be detected is slightly smaller than the maximum thickness which can be clamped by the pin penetrating clamp;
s2, processing the metal plate into two metal sheets with the same shapes as the end parts of the metal sheet sample;
s3, machining a hole with the same diameter as the pin hole at the end part of the thin metal plate sample in the central part of the metal sheet;
and S4, fixing the metal sheet sample and the perforated metal sheet together in the pin penetrating clamp by using a pin, and finishing clamping the metal sheet sample.
2. The specimen holding method according to claim 1, wherein the sheet metal is selected from TA15, Ti60 high temperature titanium alloy when the test temperature is not more than 600 ℃.
3. The method for holding a sample according to claim 1, wherein the metal plate material is selected from the group consisting of high temperature alloys such as GH4099 when the test temperature is not more than 1000 ℃.
4. The sample clamping method as claimed in claim 1, wherein the sum of the thickness of the metal plate and the thickness of the metal sheet to be measured is less than the maximum thickness which can be clamped by the pin-through clamp by 0.3-0.8 mm.
5. The method of claim 1, wherein the perforated metal sheets at both ends of the metal sheet sample are located on the same side of the metal sheet sample.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910783094.7A CN110618026A (en) | 2019-08-23 | 2019-08-23 | Sample clamping method for testing high-temperature tensile property of metal sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910783094.7A CN110618026A (en) | 2019-08-23 | 2019-08-23 | Sample clamping method for testing high-temperature tensile property of metal sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110618026A true CN110618026A (en) | 2019-12-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910783094.7A Pending CN110618026A (en) | 2019-08-23 | 2019-08-23 | Sample clamping method for testing high-temperature tensile property of metal sheet |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112414837A (en) * | 2020-11-06 | 2021-02-26 | 上海电气核电设备有限公司 | Clamping method of high-temperature sheet tensile sample |
| CN112504825A (en) * | 2020-11-11 | 2021-03-16 | 中国原子能科学研究院 | Test fixture capable of measuring temperature of test sample with fracture toughness |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202267627U (en) * | 2011-08-26 | 2012-06-06 | 四川六合锻造股份有限公司 | High-temperature tensile fixture for thin plate |
| CN102830012A (en) * | 2012-07-30 | 2012-12-19 | 国核宝钛锆业股份公司 | Clamping control device for foil strip high-temperature tensile test |
| JP2014048144A (en) * | 2012-08-31 | 2014-03-17 | Tokyo Gas Co Ltd | Unit for performing evaluation test on tabular test piece |
| CN203941063U (en) * | 2014-06-30 | 2014-11-12 | 武汉钢铁(集团)公司 | Super thin metal strip high temperature tension test fixture |
| CN104181052A (en) * | 2014-07-23 | 2014-12-03 | 华东理工大学 | Method for testing mechanical property of braze welding connector |
| CN207650011U (en) * | 2017-12-01 | 2018-07-24 | 武汉钢铁有限公司 | Sheet metal high temperature tensile clamp |
| CN108896386A (en) * | 2018-06-07 | 2018-11-27 | 中国船舶重工集团公司第七二五研究所 | A kind of clamping device and its application method of sheet metal drawing by high temperature sample |
-
2019
- 2019-08-23 CN CN201910783094.7A patent/CN110618026A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202267627U (en) * | 2011-08-26 | 2012-06-06 | 四川六合锻造股份有限公司 | High-temperature tensile fixture for thin plate |
| CN102830012A (en) * | 2012-07-30 | 2012-12-19 | 国核宝钛锆业股份公司 | Clamping control device for foil strip high-temperature tensile test |
| JP2014048144A (en) * | 2012-08-31 | 2014-03-17 | Tokyo Gas Co Ltd | Unit for performing evaluation test on tabular test piece |
| CN203941063U (en) * | 2014-06-30 | 2014-11-12 | 武汉钢铁(集团)公司 | Super thin metal strip high temperature tension test fixture |
| CN104181052A (en) * | 2014-07-23 | 2014-12-03 | 华东理工大学 | Method for testing mechanical property of braze welding connector |
| CN207650011U (en) * | 2017-12-01 | 2018-07-24 | 武汉钢铁有限公司 | Sheet metal high temperature tensile clamp |
| CN108896386A (en) * | 2018-06-07 | 2018-11-27 | 中国船舶重工集团公司第七二五研究所 | A kind of clamping device and its application method of sheet metal drawing by high temperature sample |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112414837A (en) * | 2020-11-06 | 2021-02-26 | 上海电气核电设备有限公司 | Clamping method of high-temperature sheet tensile sample |
| CN112504825A (en) * | 2020-11-11 | 2021-03-16 | 中国原子能科学研究院 | Test fixture capable of measuring temperature of test sample with fracture toughness |
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Application publication date: 20191227 |
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| RJ01 | Rejection of invention patent application after publication |