Tensile fixture for platy sample and application method thereof

A plate-shaped sample and fixture technology, which is applied in the direction of applying stable tension/pressure to test the strength of materials, instruments, measuring devices, etc., can solve the problem of not being able to test small-sized samples, wasting time, manpower and material resources, and prone to oxidation. and sintering, to achieve the effect of reducing test cost, convenient loading and stable connection

Pending Publication Date: 2017-03-08
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, for fixtures with threaded structures, it is impossible to test small-sized specimens
[0006] (2) In terms of structure, when the threads of the threaded sample and the fixture work under high temperature conditions for a long time, oxidation and sintering are prone to occur, resulting in a series of problems such as the tripping of the sample and the fixture
If the fixture thread is aging or the connection is not good, it is necessary to reinstall the fixture and the tested sample, wasting time, manpower and material resources

Method used

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  • Tensile fixture for platy sample and application method thereof
  • Tensile fixture for platy sample and application method thereof
  • Tensile fixture for platy sample and application method thereof

Examples

Experimental program
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Embodiment 1

[0037] Embodiments of the present invention are a kind of tensile test method, which is completed by using the described tensile fixture for a plate-shaped sample. In this embodiment, the tensile test is carried out on nickel-based superalloys using the fixture of the present invention. The method includes Follow the steps below:

[0038] (1) Processed by wire cutting method image 3 The sheet sample 4 shown;

[0039] (2) The surface and sides of the sheet sample 4 are polished with sandpaper to improve the flatness of the sample surface;

[0040] (3) Clean the surface of sample 4 with acetone solution to remove surface oil and impurities;

[0041] (4) Tensile clamps 3,5 are fixed on the connecting rods 1,6 at both ends of the tensile testing machine;

[0042] (5) Fix the sample 4 into the fixture, and pre-tighten the fixture and the sample after the temperature of the heating furnace rises to 650°C and stabilizes;

[0043] (6) Set the tensile parameters, and carry out the...

Embodiment 2

[0046] Embodiments of the present invention are a kind of tensile test method, which is completed by using the described tensile fixture for a plate-shaped sample. In this embodiment, the tensile test is carried out on nickel-based superalloys using the fixture of the present invention. The method includes Follow the steps below:

[0047] (1) Processed by wire cutting method image 3 The sheet sample 4 shown;

[0048](2) Use sandpaper to grind the side arc of the sheet sample 4 to reduce surface scratches caused by processing and avoid abnormal fracture of the sample due to stress concentration during stretching; surface parallelism;

[0049] (3) Clean the surface of sample 4 with acetone solution to remove surface oil and impurities;

[0050] (4) Raise the upper pull rod of the stretching machine for a certain distance, and fix the clamp to the upper pull rod of the stretching machine through pins. Adjust the height of the tie rod so that the two fixtures are close to eac...

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PUM

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Abstract

The invention discloses a tensile fixture for a platy sample, characterized by comprising fixture bodies (3 and 5) each of which provided with a pinhole (7) in one end and which are connected to tensile tester connection rods (1 and 6) through pins (2) so that axes of test tensile force, the fixture and a test piece are superposed; the other ends of the fixture bodies (3 and 5) are each provided with a vertical slot running through the fixture, the bottom of each groove slot is provided with a sample groove (8), the width of the sample grooves (8) is slightly greater than the thickness of the test piece (4) so that it is ensured that the test piece (4) may be placed in the fixture bodies (3 and 5) for a tensile test. The invention also discloses a tensile test method employing the fixture. According to the scheme of the invention, the end of each fixture body is provided with the vertical slot running through the fixture, and it is possible to carry out a tensile test for various samples of high strength, high hardness and high processing difficulty.

Description

technical field [0001] The invention belongs to the field of clamps, and more specifically relates to a tensile clamp for a plate sample and a method for using the same. Background technique [0002] Superalloys are the key materials used in the hot end of aerospace engines. In advanced aeroengines, the amount of superalloys accounts for more than 60% of the total engine. The mechanical properties of such alloy materials, including normal temperature / high temperature tensile properties, fatigue properties, etc., are important indicators to measure materials under high temperature working conditions. [0003] At present, tensile testing machines are often used to test the properties of metal materials. When performing high-temperature tests, threaded connection structures are used, and the tested samples are threaded with the pull rods of the tensile testing machine. Although this kind of sample is very tightly connected with the pull rod of the testing machine during the te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N3/18G01N3/04
CPCG01N3/04G01N3/08G01N3/18G01N2203/04G01N2203/0226G01N2203/0017
Inventor 肖建华滕庆
Owner HUAZHONG UNIV OF SCI & TECH
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