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Persistent URL http://purl.org/net/epubs/work/43478
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Record Id 43478
Title Inter-granular residual stresses in polycrystalline aggregates : finite element modelling and diffraction post-processing
Abstract Most models based on continuum mechanics do not account for inhomogeneities at the micro-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 and crystallographic orientation. In this way, the relationship between the macroscopic stress state and the stress state at the grain level can be investigated in detail. In addition, this approach enables the determination of the inhomogeneous fields of plastic strain, the identification of regions of localised plasticity (persistent slip bands), grain level shakedown, and the prediction of fatigue crack initiation using energy dissipation at the micro-scale. Elastic anisotropy is known to promote earlier onset of yielding, and to increase the magnitude of intergranular residual stresses. The effect of hardening behaviour of different slip systems on intergranular residual stresses is more subtle, as discussed in the text. The present study focuses on the analysis average intergranular residual strains and stresses that arise within the polycrystal aggregate following the application of single or cyclic external loading. These residual strains can also be evaluated experimentally using diffraction of penetrating radiation, e.g. neutrons or high energy X-rays, allowing comparisons with the model predictions to be made.
Organisation ISIS , ISIS-ENGIN-X , STFC
Keywords residual stress , elasticity , polycrystal , plasticity , Engineering , diffraction
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Language English (EN)
Type Details URI(s) Local file(s) Year
Paper In Conference Proceedings In "MECA SENS IV - Conference on Stress Evaluation", Vienna, Austria, 24-26 Sep 2007, 571-572 (2008): 271-276. Song_polyx.2.published.pdf 2008
Journal Article Mater Sci Forum 571-572 (2008): 271-276. doi:10.4028/www.s….net/MSF.571-572.271 2008