ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
There have been many theoretical studies to predict the stress fields around the tip of agrowing fatigue crack. However, until recently the highly-localized, small scale nature of thestresses has meant that direct measurement has not been possible. With the current generation ofsynchrotron X-ray sources, sub-millimetre sampling dimensions are now possible, and it hasbecome possible to evaluate directly the stresses at the tip of a fatigue crack and to see how thestresses evolve as the result of an overload, for example.In this paper we present results of synchrotron X-ray diffraction analysis of the stress fieldsaround a fatigue crack in aluminium alloy 5091 (Al-Mg-Li-C-O); this is a dispersion-strengthenedalloy with a fine grain size, which makes it ideal for such experiments. Compact tension (CT)specimens were prepared with constant amplitude fatigue loading. The energy dispersive X-raydiffraction (EDXRD) technique was used for measuring strains around the crack tip along the midthickness of the specimen under in-situ loading. The measurement was carried out at the ESRF(European Synchrotron Radiation Facility), Grenoble, France on the ID15A beam line. Theexperimental crack tip stresses have been compared with the analytical fracture mechanics solution
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.571-572.119.pdf
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