A Creep Strength Test Method Based on Acoustic Emission Activity Analysis

Abstract

The invention provides a creep strength testing method based on acoustic emission activity analysis, which includes providing a solid material specimen, continuously applying a constant load to the solid material specimen within an appropriate test time, collecting acoustic emission waves, and setting an acoustic emission threshold value, record the acoustic emission event rate, judge the change law of the acoustic emission event rate, and directly obtain the creep strength of the solid material specimen. Adopting the technical scheme of the present invention, the acoustic emission wave of the solid material is firstly monitored in real time by using the acoustic emission technology, and then the acoustic emission event rate is obtained through a statistical method, and the creep strength of the solid material is directly obtained according to the change rule of the acoustic emission event number , simplifies the creep strength test process, shortens the test time, reduces the test time cost, and improves the reliability of the test results.

Description

technical field [0001] The invention relates to the technical field of acoustic emission, in particular to a creep strength testing method based on the activity analysis of acoustic emission. Background technique [0002] The creep strength of solid materials is an important mechanical index for solid engineering applications. Creep strength is the maximum load that can theoretically keep the solid material permanently intact under the condition that the load acting on the solid material is kept constant. In the field of rock mechanics, it is equivalent to the permanent strength of the rock. Creep is a property in the rheological mechanical properties of solids. It refers to the phenomenon that the deformation of solid materials continues to increase under a constant load. The schematic diagram of the creep deformation failure curve of solid materials is as follows. figure 1 As shown, due to the creep characteristics of solid materials, when the load exceeds the creep stren...

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Problems solved by technology

In the prior art, when the creep strength of a solid material specimen is usually viewed from the side, it is necessary to continuously apply a constant load to the solid material specimen within an appropriate test time, and collect the acoustic emission of the solid material specimen within the test time wave, and finally judge the degree of damage to the solid material specimen according to the waveform variation law of the acoustic emission wave. Since the constant load continuously applied to the solid material specimen has great randomness and uncertainty, it is often During the test process, it is not possible to judge the damage degree of the solid material specimen according to the waveform change law of the acoustic emission wave. Therefore, the test process consumes a lot of time and energy of the test personnel, and often takes days or months to complete. The time cost of the test is extremely high. At the same time, since the constant load applied on the solid material specimen is closer to the creep strength, the variation law of the obtained acoustic emission waveform is closer, and the testers often cannot get close to it from these Find out the key factors and decisive indicators that determine the creep strength of solid material specimens from the acoustic emission wave waveform, therefore, it is impossible to obtain quantitative creep strength values

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