Blade high-temperature fatigue stress testing method based on normal-temperature strain testing

By using a room-temperature strain testing method, the vibration stress of blades at high temperatures can be predicted, which solves the problem of high cost of high-temperature strain gauges in high-temperature and high-cycle fatigue tests. This method achieves accurate measurement and cost reduction, and is suitable for high-temperature fatigue stress testing of aero-engine blades.

CN116519302BActive Publication Date: 2026-06-12AECC SICHUAN GAS TURBINE RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
AECC SICHUAN GAS TURBINE RES INST
Filing Date
2023-04-12
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

Existing technologies for high-temperature strain gauge testing in blade high-temperature and high-cycle fatigue tests are costly and complex to prepare, making it difficult to meet the requirements for accurate measurement and prolonging the test cycle.

⚗Method used

By obtaining the stress-amplitude transfer ratio through room temperature strain testing, and combining it with the vibration parameters of the blade under high temperature conditions, the vibration stress at high temperature can be predicted, and low-cost room temperature strain gauges can be used to replace high temperature strain gauges.

🎯Benefits of technology

It enables accurate prediction of blade vibration stress under high temperature conditions, reduces test costs, shortens the test cycle, and has an error within 50×10-6, meeting the needs of engineering applications.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application provides a blade high-temperature fatigue stress test method based on normal-temperature strain test, and belongs to the technical field of aero-engine test and test. The technical scheme only consumes low-cost normal-temperature strain gauges, and can realize the prediction of the vibration stress of the blade under the high-temperature state, and the absolute error between the strain prediction value and the measured value is not more than 50*10 ‑6 , which fully meets the demand of engineering application. In the high-temperature high-cycle fatigue test of the blade, the high-temperature strain gauges, which are hundred times more expensive than the normal-temperature strain gauges and have a longer preparation period, are not needed, the blade high-temperature vibration stress test can be realized, and the test cost can be greatly reduced and the test efficiency can be improved.
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