Method and device for testing tensile strength

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...

AI Technical Summary

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

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