A crystal plasticity model for describing the anisotropic hardening behavior of steel sheets during strain-path changes

Hwigeon Kim, Frederic Barlat, Yongmoon Lee, Shakil Bin Zaman, Chong Soo Lee, Youngun Jeong (Corresponding Author)

    Research output: Contribution to journalArticleAcademicpeer-review

    9 Citations (Scopus)

    Abstract

    In the present study, a viscoplastic self-consistent crystal plasticity model (VPSC-RGBV), whichaccounts for various microstructural features, including the accumulation and annihilation ofdislocations due to slip activity and latent hardening originated from interactions betweengliding dislocations on different slip planes, is described. The simulation results of the VPSC-RGBV model are compared with those of a macro-mechanical distortional plasticity model, theso-called homogeneous anisotropic hardening (HAH), and experimental data pertaining to metalsundergoing complex loading histories. The differences between the simulated and experimentalresults under non-proportional loading, including 1) the stress-strain curve, 2) instantaneous r-value after strain-path change, and 3) yield surface evolution, are discussed. Finally, potentialimprovements are suggested for VPSC-RGBV model.
    Original languageEnglish
    Pages (from-to)85-106
    Number of pages22
    JournalInternational journal of plasticity
    Volume111
    DOIs
    Publication statusPublished - Dec 2018

    Keywords

    • Microstructures
    • Crystal plasticity
    • Constitutive behavior
    • Optimization
    • Strain-path change

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