Abstract
Fatigue fracture is a common failure mode of steel structure, and it usually leads to steel structure failure. In this study, the fatigue damage of duplex 2205 stainless steel with different stress ratios was monitored based on acoustic emission (AE) technology. The fatigue crack growth length, stress intensity factor, fatigue crack growth rate, and the various characteristics of the count, amplitude, and average signal level (ASL) of AE parameters during the whole process were recorded. The results show that AE parameters count and amplitude can well characterize the three stages of fatigue crack initiation, steady-state growth and failure fracture. In the steady-state growth stage, the crack length prediction models based on single-factor and multi-factor of AE parameters suitable for different stress ratios were established and compared for the first time. The multi-factor model has the highest prediction accuracy and it can provide an effective basis for monitoring methods.
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