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Early detection of damage in thermo-cyclically loaded austenitic materials

: Altpeter, Iris; Tschuncky, Ralf; Hällen, Karl; Dobmann, Gerd; Boller, Christian; Smaga, M.; Sorich, A.; Eifler, Dietmar


Rao, B.P.C. (Ed.); Jayakumar, T. (Ed.); Balasubramanian, K. (Ed.); Raj, B. (Ed.):
Electromagnetic nondestructive evaluation XV : Selected papers from the 16th International Workshop on Electromagnetic Nondestructive Evaluation, which was held Chennai, India, from March 10 - 12, 2011 2010
Amsterdam: IOS Press, 2012 (Studies in Applied Electromagnetics and Mechanics 36)
ISBN: 978-1-60750-967-7
ISBN: 978-1-60750-968-4
International Workshop on Electromagnetic Nondestructive Evaluation (ENDE) <16, 2011, Chennai>
Fraunhofer IZFP ()
fatigue; austenitic steel; deformation induced martensite; EMAT; NDT

Early detection of damage in cyclically loaded austenitic steel was performed with electromagnetic acoustic transducer measurements in total strain controlled low cycle fatigue tests at ambient and elevated temperature. The application of physically based measurement data, e.g. time of flight from electromagnetically activated ultrasonic signals in austenitic fatigue specimens and total strain, enables measurements of a new hysteresis relationship. This hysteresis gives, in analogy to the stress-strain hysteresis, information about the actual state of fatigue of the austenitic steel and shows significant changes in shape before specimen failure.