Method for mixing extension meter in hgih temperature strain fatigue test

Abstract

The invention relates to a fixation method for extensometer while testing sample distortion in hot mechanical fatigue test. It is made up of neutral powder A103 powder and binding agent water glass according to weight ratio of (1:1)-(1:5), casting onto sample and the thickness is 10-100mm. The invention could expand roughness of surface, and improve the friction force between explication bar and surface. The slipping phenomenon of explication bar in fatigue test would be avoided.

Description

technical field [0001] The invention relates to a fixing method of an extensometer used for measuring the strain of a sample during a thermomechanical fatigue test, in particular to a method capable of relatively fixing the extensometer to the sample during the thermomechanical fatigue test. Background technique [0002] Due to the development of aviation and aerospace technology, many materials are used in aviation and aerospace equipment, but aerospace materials are different from general materials, and the requirements for its various performance indicators are both high and precise. The data of this performance test is also required to be both accurate and precise. Among them, when measuring the thermomechanical fatigue life of materials under high temperature environment, strain control is adopted. As shown in Figure 1, the high temperature strain fatigue testing machine includes: sample 1, upper clamp 2 of the testing machine, and lower clamp 3 of the testing machine (...

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Problems solved by technology

In addition, for the sample for fatigue test, since the surface defects will affect the fatigue life, the surface requirements are very high. The surface of the sample is very smooth. Smooth, so that when the extension rod of the extensometer is pressed against two points on the sample, it is easy to slip, and it cannot ensure that the two points on the sample and the two ends of the extension rod remain relatively stationary

[0003] The test cycle of thermomechanical fatigue is 2-3 minutes, and each sample needs 10 5 -10 7 Weekly, very time-consuming; and the extension rod is expensive, and a broken extension rod will cost tens of thousands of yuan. Therefore, if there is slippage during the test, the test will fail due to inaccurate data or the extension rod is broken during the slipping process. , if a test fails, it will cause a lot of loss of manpower and material resources

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