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Abstract

Non-destructive positron lifetime measurements have been performed during stress-controlled symmetric fatigue of austenitic stainless steel up to failure for different applied stress amplitudes between 230 and 300 MPa. For this purpose a fatigue machine has been equipped with a mobile positron beam emitted from a 22 ýCi (0.8 MBq) {72}Se / {72}As generator. A pronounced increase of the mean positron lifetime has been found within the first 10% of fatigue life. Saturation has been reached after 40% of fatigue life. The mean positron lifetime at failure depends strongly on the applied stress amplitude.

Additional information

Authors: BARBIERI A, European Commission, Joint Research Centre, Institute for Health and Consumer Protection, Via E. Fermi 1, I-21020 Ispra (IT);HANSEN-IIZHOFER S, European Commission, Joint Research Centre, Institute for Health and Consumer Protection, Via E. Fermi 1, I-21020 Ispra (IT);IIZHOFER A, European Commission, Joint Research Centre, Institute for Health and Consumer Protection, Via E. Fermi 1, I-21020 Ispra (IT);HOLZWARTH U, European Commission, Joint Research Centre, Institute for Health and Consumer Protection, Via E. Fermi 1, I-21020 Ispra (IT)
Bibliographic Reference: Article:Applied Physics Letters, Vol. 77, No. 12 (2000), pp. 1911-1913
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