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:
Most models based on continuum mechanics do not account for inhomogeneities at themicro-scale. This can be achieved by considering a representative volume of material and using(poly)crystal elasto-plastic deformation theory to model the effects of grain morphology andcrystallographic orientation. In this way, the relationship between the macroscopic stress state andthe stress state at the grain level can be investigated in detail. In addition, this approach enables thedetermination of the inhomogeneous fields of plastic strain, the identification of regions of localisedplasticity (persistent slip bands), grain level shakedown, and the prediction of fatigue crackinitiation using energy dissipation at the micro-scale. Elastic anisotropy is known to promote earlieronset of yielding, and to increase the magnitude of intergranular residual stresses. The effect ofhardening behaviour of different slip systems on intergranular residual stresses is more subtle, asdiscussed in the text. The present study focuses on the analysis average intergranular residualstrains and stresses that arise within the polycrystal aggregate following the application of single orcyclic external loading. These residual strains can also be evaluated experimentally using diffractionof penetrating radiation, e.g. neutrons or high energy X-rays, allowing comparisons with the modelpredictions to be made
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.571-572.271.pdf
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