Inter-granular residual stresses in polycrystalline aggregates: Finite element modelling and diffraction post-processing

Xu Song, Shu Yan Zhang, Daniele Dini, Alexander M. Korsunsky

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Citations (Scopus)

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.

Original languageEnglish
Title of host publicationStress Evaluation in Materials Using Neutrons and Synchrotron Radiation - Selected, peer reviewed papers from the Int. Conf. on Stress Evaluation Using Neutrons and Synchrotron Radiation Proceedings
EditorsA.R. Pyzalla, A. Borbely, H. Peter Degischer
PublisherTrans Tech Publications Ltd
Pages271-276
Number of pages6
ISBN (Electronic)978-0-87849-360-9
DOIs
Publication statusPublished - 2008
Externally publishedYes
EventInternational Conference on Stress Evaluation Using Neutrons and Synchrotron Radiation - Vienna, Austria
Duration: 24 Sep 200726 Sep 2007

Publication series

NameMaterials Science Forum
Volume571-572
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Conference

ConferenceInternational Conference on Stress Evaluation Using Neutrons and Synchrotron Radiation
Country/TerritoryAustria
CityVienna
Period24/09/0726/09/07

Keywords

  • Diffractometer
  • Elasticity
  • Plasticity
  • Polycrystal
  • Residual stress
  • X-ray diffraction

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