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A literature review has been performed on the behaviour of short fatigue cracks in austenitic stainless steels. From the reviewed mechanisms the behaviour of austenitic steels can be seen to be consistent with the behaviour of other materials. For microstructural short cracks where the crack front samples one, or at most a few, grains, anomalous fast growth can occur on crystallographic planes which are oriented favourable for slip to occur. These microcracks can lead to either:
non propagating cracks at low stresses where cracks growth is impeded by a microstructural barrier;
fast propagating cracks where the crack tip is not close to a microstructural barrier or the stress is high. From data on Type 304 steel it can be expected that this behaviour of microcracks in the surface is restricted to crack lengths of a few grain diameters. For longer crack lengths, the behaviour of physically short cracks has to be regarded, where high plastic strains occurring at the crack tip determine the crack growth rates. The cyclic J-integral can be determined from the stress range, plastic strain amplitude, and the crack length. These parameters are used in the current procedure used in the United Kingdom to derive a design fatigue endurance curve for creep fatigue conditions.

Additional information

Authors: HUTHMANN H, Siemens, Bergisch Gladbach (DE);PICKER C, AEA Technology, NLR Risley, Warrington (GB)
Bibliographic Reference: EUR 15186 EN (1995) 90pp., FS,. ECU 10
Availability: Available from the (2)
ISBN: ISBN 92-827-5599-1
Record Number: 199610001 / Last updated on: 1996-03-18
Original language: en
Available languages: en
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