T/GFQX T/NDIE30104-2023 Method for High Temperature Vibration Fatigue Limit Test of Marine Gas Turbine Blade Using Lift-off Method

Scope

Main technical content: This standard specifies the method and specifications for high-temperature vibration fatigue limit testing of gas turbine blades used on ships. This standard applies to the vibration testing of high-temperature vibration fatigue specimens for gas turbine blades used on ships. The main technical content of this standard is as follows: 1. The test samples shall be qualified blades; 2. The test temperature shall be greater than or equal to 300℃; 3. The test equipment shall consist of an excitation system, a control system, a measurement system, and a heating device; 4. The test procedure is as follows: Using the principle of resonance testing, under the first-order bending mode of the test piece, a sinusoidal symmetric cyclic load is applied to make the blade produce forced vibration. The fatigue limit test is carried out under a specified cyclic base number according to the lifting method to obtain the fatigue test data. The test should be conducted in a closed-loop control mode, with the blade sample's amplitude measured in real time and fed back to the vibration control instrument. The control instrument automatically adjusts the control signal output to the vibration table based on the feedback signal to ensure that the sample is always tested under the resonance state and specified amplitude. The criterion for judging blade cracks is that the blade's natural frequency decreases by about 1%; 5. Methods of statistical analysis of the test results.

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