Necking of anisotropic micro-films with strain-gradient effects

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Abstract

Necking of stubby micro-films of aluminum is investigated numerically by considering tension of a specimen with an initial imperfection used to onset localisation. Plastic anisotropy is represented by two different yield criteria and strain-gradient effects are accounted for using the visco-plastic finite strain model. Furthermore, the model is extended to isotropic anisotropic hardening (evolving anisotropy). For isotropic hardening plastic anisotropy affects the predicted overall nominal stress level, while the peak stress remains at an overall logarithmic strain corresponding to the hardening exponent. This holds true for both local and nonlocal materials. Anisotropic hardening delays the point of maximum overall nominal stress.
Original languageEnglish
JournalActa Mechanica Sinica
Volume24
Issue number5
Pages (from-to)557-567
ISSN0567-7718
DOIs
Publication statusPublished - 2008

Keywords

  • Micro-film
  • Finite strain
  • Nonlocal anisotropic visco-plasticity
  • Anisotropic hardening

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