Estimating Fatigue Damage of Austenitic Steel by Combining the Ultrasonic with Eddy Current Monitoring
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We propose a non-destructive testing methodology of estimating fatigue damage in austenitic stainless steel (prior to formation of macrocracks) that is based on monitoring changes in the effective elastic properties (more precisely, the Poisson’s ratio) due to microstructural damage. The elastic properties are also affected by growth of the martensitic phase, and the problem arises of separating the two factors. This is achieved by a combination of (1) measuring Poisson’s ratio with four-digit accuracy by ultrasonic devices, and (2) estimating volume fraction of the martensitic phase by the eddy current method. It is suggested that the critical value of the change of the Poisson’s ratio due to microstructural damage can be used as a criterion of failure.
KeywordsFatigue damage Austenitic steel Monitoring Ultrasonic method Poisson’s ratio Eddy current method
This work was carried out at the NNSTU named after R.E. Alekseev, with financial support from the government in the face of the Russian Ministry of Education under the Federal Program “Research and development on priority directions of the scientific technological complex of Russia for 2014-2020”, the unique identifier of the Project: RFMEFI58017X0012.
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