Evaluation method for dynamic strength of typical vibration area of nickel-based single crystal turbine blade

Through finite element simulation and experiment evaluation of the dynamic strength of nickel-based single crystal turbine blades, the problem of failure to fully consider the main stress direction and stress concentration in the prior art is solved, and the precise evaluation of typical vibration areas is achieved, and the safety and reliability of the aircraft engine are improved.

CN120445812APending Publication Date: 2025-08-08NORTHWESTERN POLYTECHNICAL UNIV
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Patent Information

Application Number
CN202510522886.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2025-04-21
Filing Date
2025-04-24
Publication Date
2025-08-08

AI Technical Summary

Technical Problem

The existing method of dynamic strength evaluation of nickel-based single crystal turbine blades fails to fully consider the main stress direction and stress concentration issues, resulting in inaccurate evaluation, especially in typical vibration areas, which affects the safety and reliability of aircraft engines.

Method used

The turbine blade model was established through finite element simulation, the vibration characteristics and main stress direction were analyzed, the simulation was designed and the high-period fatigue and tensile tests were carried out, and the fatigue limit and three-point life model was drawn that considered stress concentration, and dynamic strength was evaluated in combination with the core maneuver test test.

Benefits of technology

Accurate dynamic strength evaluation of typical vibration areas of nickel-based single-crystal turbine blades is achieved, which improves design accuracy and safety and reliability of the aircraft engine, saves test costs, and promotes overall performance improvement.

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Abstract

The invention discloses a nickel-based single crystal turbine blade typical vibration area dynamic intensity evaluation method, which comprises the following steps: analyzing typical vibration area characteristics and a principal stress direction according to a vibration characteristic simulation result, and designing typical characteristics and crystal orientation of a simulation piece; performing a high-cycle fatigue test and a tensile test on the simulation part to obtain high-cycle fatigue strength and tensile strength, and drawing a fatigue limit model considering stress concentration; testing again to obtain high-cycle fatigue strength, and drawing a three-point equal-life model considering stress concentration; the turbine blade is subjected to a core dynamic test to obtain dynamic stress, static stress is obtained according to a vibration characteristic analog simulation result, a straight line perpendicular to the abscissa is made through a static stress numerical point, and the high-cycle fatigue strength corresponding to the intersection point of the straight line and the three-point equal-life model is the vibration fatigue limit; the ratio of the dynamic stress to the vibration fatigue limit is the dynamic strength. The method considers the main stress direction and the stress concentration problem, and the evaluation result is accurate.
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