Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 27, Issue 10-12, Pages 1408-1419Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2005.06.022
Keywords
fatigue; strain; X-ray; synchrotron; overload
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Synchrotron based energy dispersive X-ray diffraction has been used to profile the strains around fatigue cracks in 4140 steel test specimens. In particular strain field comparisons were made on specimens prepared: with initial constant stress intensity fatigue; with this initial fatigue followed by a single overload cycle; and with this fatigue-overload sequence followed by an additional constant stress intensity fatigue. The strain profiles behind, at and in-front-of the crack tip are discussed in detail. Selected strain profiles measurements under in situ applied tensile stress are also presented. The technique of optical surface height profiling reveals surface depression effects which can be correlated with the interior strain profiles. (c) 2005 Elsevier Ltd. All rights reserved.
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