A novel numerical framework for self-similarity in plasticity: Wedge indentation in single crystals

K. J. Juul*, C. F. Niordson, K. L. Nielsen, J. W. Kysar

*Corresponding author for this work

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    Abstract

    A novel numerical framework for analyzing self-similar problems in plasticity is developed and demonstrated. Self-similar problems of this kind include processes such as stationary cracks, void growth, indentation etc. The proposed technique offers a simple and efficient method for handling this class of complex problems by avoiding issues related to traditional Lagrangian procedures. Moreover, the proposed technique allows for focusing the mesh in the region of interest. In the present paper, the technique is exploited to analyze the well-known wedge indentation problem of an elastic-viscoplastic single crystal. However, the framework may be readily adapted to any constitutive law of interest. The main focus herein is the development of the self-similar framework, while the indentation study serves primarily as verification of the technique by comparing to existing numerical and analytical studies. In this study, the three most common metal crystal structures will be investigated, namely the face-centered cubic (FCC), body-centered cubic (BCC), and hexagonal close packed (HCP) crystal structures, where the stress and slip rate fields around the moving contact point singularity are presented.
    Original languageEnglish
    JournalJournal of the Mechanics and Physics of Solids
    Volume112
    Pages (from-to)667-684
    ISSN0022-5096
    DOIs
    Publication statusPublished - 2018

    Keywords

    • Asymptotic fields
    • Crystal plasticity
    • Self-similarity
    • Wedge indentation

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