Small sample hydraulic burst test method and device for material property test

Abstract

The invention discloses a sample hydraulic burst test method and loading and clamping device. The method comprises the steps of: providing a base, wherein the upper end of the base is provided with a sample accommodating groove, a liquid cavity is arranged in the base, one end of the liquid cavity is communicated with the bottom of the sample accommodating groove, and the other end of the liquid cavity is a liquid inlet end which is positioned at the lower part of the base; filling liquid in the liquid cavity to evacuate air in the liquid cavity; placing a sample in the sample accommodating groove; sheathing and securing a clamping part at the upper part of the base, and remaining the edge of the sample under a clamped condition, wherein the clamping part is provided with a measuring hole communicated with the sample accommodating groove; filling high-pressure liquid from the liquid inlet end to ensure that the sample can be dilated and deformed under the action of the high-pressure liquid till burst, and measuring test data from the measuring holes; and analyzing the test data to obtain material properties.

Description

technical field [0001] The invention relates to a method and a device for testing the performance of metal materials, in particular to a method for testing a sample hydraulic burst and its loading and clamping device. Background technique [0002] Since nuclear facilities, power plants, petrochemical and other equipment are highly dangerous facilities, some structural designs of these facilities are designed according to relatively conservative principles. At the end of the 1970s, the operating time of nuclear power plants in some countries was about to reach the design life, and people were faced with the choice of stopping or continuing to operate. Therefore, it is necessary to test the mechanical properties of materials of in-service equipment structures. Since these materials have been operating under high temperature or radiation conditions for a long time, after a period of service, it is necessary to determine whether the properties of the materials have changed, so ...

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Problems solved by technology

[0007] However, the force state of the small disc sample during the small punch test is complicated, and it is difficult to conduct effective theoretical analysis to obtain an analytical solution. Therefore, the research mainly focuses on the data accumulation of the test, and on the basis of the data accumulation, the small punch can be obtained. Empirical formulas relating bar test results to material mechanical properties, as well as simulating the test process through finite element calculations, and interpreting the data with various assumptions

However, because the small punch test is extremely sensitive to the processing method of the sample, the surface condition, the centering degree of the punch, the aperture diameter of the lower fixture platform and other factors, and the above factors are difficult to control during the test preparation and execution process, the obtained The data contains differences caused by too many out-of-control factors, resulting in the reliability of the small punch test cannot be effectively guaranteed

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