Multi-head miniature test specimen creep experiment device and test method

Abstract

The invention provides a multi-head miniature test specimen creep experiment device and a multi-head miniature test specimen creep test method. The device comprises a loading system, a clamping system, a heating and temperature control system, a measuring system and an external support frame, wherein the loading system adopts the poise top vertical loading and is positioned at the upper part of the external support frame, the clamping system is fixedly arranged on the external support frame, is positioned at the lower part of the loading system and is placed inside the heating system, the heating system is connected with the bottom of the external support frame and is externally connected with the temperature control system, the measuring system is connected with the loading system and the external support frame and is placed at the upper part of the support frame, and all independent parts are connected into a multi-head creep device system by the external support frame. The experiment device and the test method have the advantages that the problem that the existing creep experiment device cannot carry out multi-head miniature test specimen creep experiments under the low-load condition is solved, the test method and the device capable of simultaneously carrying out creep experiments on a plurality of identical or different-size miniature test specimens under the certain work condition are provided, and the creep experiments in different types such as cantilever beam test specimens, three-point bending, four-point bending and small punch test can also be realized through replacing clamps.

Description

technical field [0001] The invention relates to a novel device for testing the high-temperature creep performance of materials, in particular to a multi-head micro-sample creep test device and a test method. Background technique [0002] In industries such as petroleum, chemical industry, aerospace and nuclear power, many metal structures work in high temperature environment for a long time. Creep is the main form of damage to these high temperature structures. Apply the theory of high temperature structural integrity to accurately evaluate the remaining life of high temperature components in service. It is of great significance to ensure the safe service of high temperature bearing components. [0003] The basic premise of predicting the safety and remaining life of such structures is to obtain the high temperature performance parameters of these components in service. A common method is to obtain these parameters through uniaxial creep tests of standard specimens, but the...

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Problems solved by technology

[0005] Three-point bending and four-point bending tests, the sample is simple and easy to operate. Through the data of the bending creep test, the stress and strain of the equivalent uniaxial tensile test can be converted, and the creep activation energy Q of the material can be evaluated. Research The microstructure of the bending specimen and the analysis of the creep mechanical properties of the material, but the data of the high temperature performance of the material obtained through the bending creep test of the micro specimen is less

For the micro-specimen creep test, the required test load is small, which is at the lower limit of the load control of the traditional creep testing machine, and the original load control error will have a greater impact on the micro-sample than on the traditional large-size sample; at the same time , the current micro-sample creep test device can only carry out the creep test of one sample at a time, the required test time is long, the test cost is high, and it cannot guarantee that the sample is in the same environment for each test, which increases the system error The number of variables reduces the comparability of experimental data

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