Strain gradient effects in surface roughening

Ulrik Borg, N.A. Fleck

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    A thin aluminium sheet comprising of large polycrystals is pulled in uniaxial tension and the resulting surface profile is measured in a scanning electron microscope. The surface profile near the grain boundaries reveals a local deformation pattern of width of a few micrometres and is strong evidence for strain gradient effects. Numerical analyses of a bicrystal undergoing in-plane tensile deformation are also studied using a strain gradient crystal plasticity theory and also by using a strain gradient plasticity theory for an isotropic solid. Both theories include an internal material length scale. An interfacial potential that penalizes the dislocations in crossing the grain boundary is included in the analysis. The results indicate that the surface profile is strongly dependent upon the choice of this potential and on the material length scale.
    Original languageEnglish
    JournalModelling and Simulation in Materials Science and Engineering
    Volume15
    Issue number1
    Pages (from-to)S1-S12
    ISSN0965-0393
    DOIs
    Publication statusPublished - 2007

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