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**V. test results**

The fatigue strength limit and stress-life (S-N) curves of a small blade were successfully measured.

**Second, solution design**

Develop a high-frequency high-acceleration fatigue test system with a maximum frequency of 6000 Hz and a maximum acceleration of 500 g.

1. Determine the first three natural frequencies, mode shape and damping ratio of the blade;

2. Determine the position of the maximum stress point at the first-order natural frequency of the blade;

3. Determine the fatigue strength limit and stress-life (S-N) curve of the blade.

**Fourth, test implementation**

1. Determine the first three natural frequencies, mode shapes and damping ratios by modal test;

2. Determine the maximum stress point position of the blade at the first-order natural frequency by the stress distribution test;

3. Using the high-frequency high-acceleration fatigue test system, the blade stress-life (S-N) curve is measured;

The fatigue strength limit value and the stress-life (S-N) curve of a small blade were measured.

**Third, equipment development test plan**

**First, test purpose orrequirement**

**High-frequency high-acceleration vibration fatigue test of a blade**