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Abstract

In this report the first test results in the behaviour of short fatigue cracks in 316L(N) stainless steel in air (20 C and 550 C) and argon (550 C) are reported. Low cycle fatigue (LCF) tests were performed on cylindrical specimens. The tests were interrupted after a given numbers of cycles for the measurement of crack length using a replica technique. The data were analysed and the crack growth laws were derived on the basis of the cyclic J integral (Z). Comparison with the growth rates of long cracks whos that the influence of cyclic hardening has to be taken into account. The growth rates measured for short cracks were covered by the upper bound for long cracks at R-0.5. To confirm this result, long crack growth data on cyclic hardened material are required together with validation of the generated data in air. Regarding the environment, it was found that crack growth rates for short cracks in argon were significantly lower than in air. Life predictions on the basis of the cyclic J integral of Tomkins' equation led to acceptable agreement with data measured in LCF tests, if the number of cycles to crack initiation was taken into account. Additionally Tomkins' equation has been used to predict the crack depth in the tests.

Additional information

Authors: HUTHMANN H, Siemens KWU, Erlangen (DE);LIVESEY V B, AEA Technology, Risley (GB);VEHOFF H, Max-Planck-Institut für Eisenforschung, Düsseldorf (DE)
Bibliographic Reference: EUR 16809 EN (1996) 99pp., FS, ECU 11.50
Availability: Available from the (2)
ISBN: ISBN 92-827-7489-9
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