Abstract
This study is concerned with the assessment of the fatigue life of cracked steam turbine blades which operate under cyclic loading conditions. The turbine blades fatigue life estimation approach includes numerical stress-strain analysis of real rotor components, experimental study of fatigue and fracture resistance material properties and determination of crack growth rate characteristics on the round bar specimens with the single edge notch. Static and cyclic tests were performed to obtain the main mechanical properties and the fatigue life characteristics of blade's material after loading history. Both specimens with the initial surface state and specimens with high velocity air fuel (HVAF) coating were tested. As a result the fatigue life characteristics of blade's material were determined as a function of operating time. The fatigue crack growth study of surface flow was performed for round bar specimens with different initial single edge notch depth. Experimental constants describing the linear parts of the fatigue fracture diagrams were determined.
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