Method for determining crack propagation characteristics of turbine engine rotor

Abstract

The present invention discloses a method for determining crack propagation characteristics of a turbine engine rotor. The method comprises defect fabrication, structural member forging blank fabrication, test block design, test block fabrication, gantry orthogonal fatigue test, and full focus phased array detection correspondence establishment, CT three-dimensional reconstruction detection correspondence establishment, test block fracture analysis, structural parts fabrication, structural part defect identification, structural part fatigue test, structural part internal crack detection, structural part surface crack detection, structural part fracture analysis. The method solves the problem of determining location and size of defects and cracks. The method achieves the purpose of quantitative analysis of internal cracks and internal characteristics of surface cracks and achieves the purpose of mastering the crack propagation law and further achieving damage tolerance design. The methodhas strong crack propagation characteristics determination ability, and solves shortcomings of the existing crack propagation characteristics determination technology.

Description

technical field [0001] The invention belongs to the technical field for indicating or measuring workpiece characteristics, and specifically relates to a method for determining crack propagation characteristics of a turbine engine rotor. Background technique [0002] Due to material and processing factors, there are defects of a certain size (initial damage) in the structure. After the structure has been in service for a period of time, cracks are easy to initiate at the defect, and the crack expansion to a certain size will cause fatigue damage to the structure. Therefore, the service life of the structure with defects is much less than the low cycle fatigue design life. For the turbine engine rotor structure with harsh working conditions and high safety requirements, it is necessary to use the damage tolerance design method to analyze the crack growth process in the structural design and troubleshooting analysis, so as to achieve important parameters such as reasonable ove...

AI Technical Summary

Problems solved by technology

The ultrasonic method can identify defects and cracks more sensitively, but due to the scattering and refraction of waves, it is difficult to determine the position and size of defects and cracks; the X-ray method can locate defects more accurately, but it is not sensitive to non-opening cracks. It is difficult to identify the crack and its size; the above-mentioned internal crack growth characteristics and surface crack growth internal characteristics can be determined with an accuracy of several millimeters, or even tens of millimeters, so that this problem is still only a qualitative analysis

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