Evolution of crack-tip stresses during a fatigue overload event.

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dc.contributor.authorSteuwer, Aen_AU
dc.contributor.authorRahman, Men_AU
dc.contributor.authorShterenlikht, Aen_AU
dc.contributor.authorFitzpatrick, MEen_AU
dc.contributor.authorEdwards, Len_AU
dc.contributor.authorWithers, PJen_AU
dc.date.accessioned2010-07-05T06:02:08Zen_AU
dc.date.available2010-07-05T06:02:08Zen_AU
dc.date.issued2010-06en_AU
dc.date.statistics2010-06en_AU
dc.description.abstractThe mechanisms responsible for the transient retardation or acceleration of fatigue crack growth subsequent to overloading are a matter of intense debate. Plasticity-induced closure and residual stresses have often been invoked to explain these phenomena, but closure mechanisms are disputed, especially under conditions approximating to generalised plane strain. In this paper we exploit synchrotron radiation to report very high spatial resolution two-dimensional elastic strain and stress maps at maximum and minimum loading measured under plane strain during a normal fatigue cycle, as well as during and after a 100% overload event, in ultra-fine grained AA5091 aluminium alloy. These observations provide direct evidence of the material stress state in the vicinity of the crack-tip in thick samples. Significant compressive residual stresses were found both in front of and behind the crack-tip immediately following the overload event. The effective stress intensity at the crack-tip was determined directly from the local stress field measured deep within the bulk (plane strain) by comparison with linear elastic fracture mechanical theory. This agrees well with that nominally applied at maximum load and 100% overload. After overload, however, the stress fields were not well described by classical K fields due to closure-related residual stresses. Little evidence of overload closure was observed sometime after the overload event, in our case possibly because the overload plastic zone was very small. © 2010, Elsevier Ltd.en_AU
dc.identifier.citationSteuwer, A., Rahman, M., Shterenlikht, A., Fitzpatrick, M. E., Edwards, L., & Withers, P. J. (2010). Evolution of crack-tip stresses during a fatigue overload event. Acta Materialia, 58(11), 4039-4052. doi:10.1016/j.actamat.2010.03.013en_AU
dc.identifier.govdoc1860en_AU
dc.identifier.issn1359-6454en_AU
dc.identifier.issue11en_AU
dc.identifier.journaltitleActa Materialiaen_AU
dc.identifier.pagination4039-4052en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.actamat.2010.03.013en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1760en_AU
dc.identifier.volume58en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectStress intensity factorsen_AU
dc.subjectPlasticityen_AU
dc.subjectFatigueen_AU
dc.subjectCrack propagationen_AU
dc.subjectAccelerationen_AU
dc.subjectSynchrotron radiationen_AU
dc.titleEvolution of crack-tip stresses during a fatigue overload event.en_AU
dc.typeJournal Articleen_AU
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