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Method and device for testing tensile strength

A technology of tensile strength and test method, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problems of complex test system, large test sample, difficult to put into the irradiation chamber, etc., to achieve accurate test results, The effect of expanding the scope of application and simple testing process

Inactive Publication Date: 2015-11-11
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Claims
  • Application Information

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Problems solved by technology

However, for graphite materials used in nuclear reactors, it is necessary to test its tensile strength in an irradiation environment, and the test sample of the direct tensile method is too large (such as the minimum size of the sample specified in ASTMC749-08StandardTestMethodforTensileStress-StrainofCarbonandGraphite is: Φ12.95*120.65mm, dumbbell shape), difficult to put into the irradiation chamber
In addition, the sample processing and testing system of the direct tensile method is very complicated, and sample clamping devices are required at both ends, and are connected to the testing machine through a chain, which is difficult to use for graphite tensile strength testing at high temperatures

Method used

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  • Method and device for testing tensile strength
  • Method and device for testing tensile strength

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Embodiment Construction

[0023] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0024] Aiming at the shortcomings of the existing direct stretching method, the present invention creatively introduces the existing Brazilian disc splitting method used in the measurement of rock tensile strength into diamond, graphite, etc., where the ratio of compressive strength to tensile strength is less than 5 The tensile strength test of the material, and through the improvement of the test fixture, overcome the problem that the sample cannot be split along the diameter direction because the force point of the disc sample fails before the center of the sample.

[0025] In order to facilitate the public's understanding, before the technical solution of the present invention is described in detail, the existing Brazilian disc splitting method is briefly introduced.

[0026] The splitting method originated from the tensile strength test of brittle ...

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Abstract

The invention discloses a method for testing tensile strength, which is used for testing the tensile strength of to-be-tested materials with ratio between compressive strength and tensile strength being less than 5, and belongs to the technical field of testing on the mechanical properties of materials. According to the invention, a Brazilian disc splitting method is adopted for testing the tensile strength of the to-be-tested material; during testing by using the Brazilian disc splitting method, a pair of testing clamps with V-shaped slots are used for applying pressure load to the diameter direction of the sample of a disc-shaped to-be-tested material; each V-shaped slot comprises an arc part positioned at the bottom of the slot and an extension part extending along the tangential directions at tow ends of the arc part; the arc part is a section of arc with diameter equal to that of the sample of the to-be-tested material and with angle of 20-40 degrees; and the lateral thickness of the V-shaped slot is equal to or greater than the thickness of the sample of the to-be-tested material. The invention further discloses a device for testing the tensile strength. The method and the device have the advantages of being low in requirements on sample size and shape, simple and convenient in testing, accurate in testing result and the like.

Description

technical field [0001] The present invention relates to the technical field of testing mechanical properties of materials, in particular to a tensile strength testing method for testing the tensile strength of a material to be tested (such as a graphite material) whose ratio of compressive strength to tensile strength is less than 5 and device. Background technique [0002] Due to its unique material properties, graphite materials are widely used in various fields of modern industry, for example, they are used as moderator materials for fourth-generation nuclear reactors. Tensile strength (tensile strength) is an important mechanical property of graphite materials. Accurately measuring the tensile strength of graphite materials is of great significance for the research and application of graphite materials. Generally speaking, the tensile strength of graphite materials is measured by direct tensile method, such as American ASTMC749-08 Standard Test Method for Tensile Stress...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
Inventor 张灿曾广礼夏汇浩贺周同蔡茂源
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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