The fatigue life of MW wind turbine blade was assessed by applying theoretical calculation and test
verification. Firstly, the fatigue characteristic curve of FRP material was obtained based on Palmgren-Miner damage
theory. Furthermore, The fatigue life of Aeroblade1.5-40.3 wind turbine blade using multistage loading accumulative
damage theory could be evaluated over 20 years accordingly. Then the coordinate system of wind turbine blade and its
Bladed simulation model were set. By calculating fatigue loading, the moment distribution of fatigue test was obtained.
Finally, the blade’s fatigue loading system driven by an eccentric mass was built and the multi-level amplitude resonant
mode was adopted to carry on the test. Almost three months’ test results showed that the blade vibrating amplitude was
constant, which illustrate the little variation of stiffness of loading point. The stable of stiffness could testify the fatigue
life of blade was over 20 years. The results of in-site experiment were basically consistent with the theoretical calculation.