The main purpose of this research is to develop a structural health monitoring method for fatigue behavior of Ti alloys. Experiments were conducted on the effect of microstructure on fatigue behavior at room temperature. Analysis of fracture and deformation behavior using finite element method simulation was also performed. Resutls of AE measurements during fatigue crack initiation and propagation was used to assimilate the mechanical informations using data science methods. For example, a method to directly predict the crack growth rate with variance from the AE measurement results was developed.
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