Device and method for detecting high-temperature vibration fatigue characteristics of aero-engine blade

Abstract

The invention provides a device and a method for detecting high-temperature vibration fatigue characteristics of an aero-engine blade. A vibration loading system is used to apply a vibration load to an aero-engine blade, and the aero-engine blade is heated and controlled by an electric induction heating system; a three-dimensional digital image correlation method is utilized to detect and analyzethe vibration fatigue characteristics of the aero-engine blade under a high temperature vibration load. The invention utilizes the three-dimensional digital image correlation method of non-contact optical full-field deformation measurement, and can adapt to measurement under various scales and various conditions; the accuracy of the detection result is ensured; vibration fatigue monitoring of theaero-engine blade can be achieved at different temperatures and different frequencies; and the comprehensiveness of the experimental result can be ensured.

Description

Technical field: [0001] The invention belongs to the technical field of vibration fatigue tests, and in particular relates to a detection device and method for high-temperature vibration fatigue characteristics of aeroengine blades. Background technique: [0002] Vibration is the primary service environment for aeronautical components. Vibration fatigue damage is one of the main forms of crack and fracture failure of aero-engine blades. Aero-engine blades usually work under high temperature, high pressure, and alternating loads. The detection of vibration fatigue characteristics in high temperature environment is particularly important. [0003] At present, the detection of vibration characteristics of aeroengine blades is mostly limited to vibration fatigue under normal temperature. For example, the patent application with patent number 201310073338.5 has proposed a non-contact measurement of blade fatigue closed-loop vibration test method, which uses the measurement contr...

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Problems solved by technology

[0004] The closest to the present invention is the patent application with application number 201610066802.1, which proposes a test device for engine blade fatigue. Compared with the present invention, the fixture for clamping the blades connected to the table also has the following disadvantages: 1. This method does not consider the impact of high temperature on the vibration loading system and information collection system, and cannot guarantee the reliability of the equipment under high temperature working conditions ; 2. At the same time, a high-temperature box is connected to the vibration device to realize the detection of high-temperature vibration fatigue.

There are still many deficiencies in the practical application of the two-dimensional digital image correlation method: 1) the surface of the object must be or approximately a plane; 2) the optical axis of the camera must be perpendicular or approximately perpendicular to the surface of the object; 3) The movement of the surface of the object mainly occurs in the plane, and the out-of-plane movement component has no or very small

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