Simulation test method of thermal fatigue failure of blade with thermal barrier coating

Abstract

The invention belongs to the technical field of turbine blade performance detection in the aviation industry, in particular to a simulation test method of thermal fatigue failure of a blade with thermal barrier coating. The method can simulate the thermal fatigue work environment of temperature alternating circulation of various blades in an aircraft engine with high performance, and simultaneously tests and analyzes data, such as temperature, temperature gradient, surface topography image evolution, three dimensional deformation field, three dimensional displacement field, interface oxidation layer and thickening rule thereof, thermal fatigue flaw initiation and expansion, cooling airflow and the like of a blade sample with a thermal barrier coating, thus realizing real-time monitoring of three dimensional thermal strain and stress of the blade in the process of thermal fatigue experiments, and providing an important means for predicting thermal fatigue damaging position and invalidation time of the blade. The experimental data obtained by the method can provide important experiment basis for effectively evaluating the failure mechanism of the aircraft engine blade in the environment of high-temperature gas and predicting ceramic coating dropping position, dropping time and service life.

Description

technical field [0001] The invention belongs to the technical field of turbine blade performance detection in the aviation industry, in particular to a method for testing the thermal fatigue performance and failure process of high-temperature components under thermal cycle conditions, and in particular to a thermal barrier coating used in an aircraft turbine engine A simulation test method for thermal fatigue failure of blades with layers. Background technique [0002] In recent years, with the development of aero-engines towards high bypass ratio, high thrust-to-weight ratio, and high turbine inlet temperature, the operating temperature of the engine is getting higher and higher, and the turbine inlet temperature has become a key indicator to measure the performance of the engine. The turbine inlet temperature of modern aero turbine engines can reach up to 1800K or even 2000K (about 1727 degrees Celsius, which exceeds the melting point of most metal materials). In order to...

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Problems solved by technology

This patent mainly defines the longitudinal allowable strain of the turbine blade, and cannot test the deformation of the entire blade, so it is difficult to predict its fatigue failure based on the overall deformation of the blade; at the same time, it is not possible to test the blade in all directions in real time in a high temperature environment. deformation, has not been involved in thermal fatigue failure of blades with thermal barrier coatings

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