Fatigue Life Assessment Method for Large Megawatt Wind Turbine Spindle Flange Bolts
Large megawatt wind turbine spindle flange bolted connections are subject to complex alternating loads,which is highly susceptible to fatigue damage.A finite element numerical model of bolt connection was constructed,taking the flange interface coating friction enhancement process as the background,the stress change law of the dangerous parts of flange connection was analyzed under different preload conditions,the actual load data of bolts were given by GH-Bladed and combined with rain flow counting method,the material S-N curves were modified according to Eurcode3 specification.The fatigue life of bolt connection under different preloads was obtained by using FE-SAFE,and the influence of the flange interface coating friction increase and preload change on the fatigue life of bolt connection was clarified,and the fatigue life evaluation method of bolt based on flange structure was proposed.The results show that increasing the friction coefficient of the flange interface and reducing the bolt preload within 850 kN to 1 100 kN are beneficial to im-prove the fatigue life of the bolted connection.
high strength boltswind power flangefinite element simulationfatigue life evaluation
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