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A Spectral Crystal-Plasticity Virtual Laboratory for Efficient Calibration of Anisotropic Yield Surfaces

SSRN, ISSN: 1556-5068
2023
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  • Usage
    183
    • Abstract Views
      143
    • Downloads
      40

Article Description

A virtual laboratory is presented, capable of calculating virtual loads using the spectral solver in the DAMASK software for crystal-plasticity simulations in desired stress directions. Calculations are used for the calibration of yield surfaces. The required spatial resolution is assessed based on a comparison with the previously published crystal-plasticity finite-element method (CPFEM) and experimental results for three different aluminium alloys (AA1050, AA3103O, and AA3103H18) with 1000 and 2500 grains in a representative volume element. The results of the crystal plasticity fast Fourier transform (CPFFT) method agree well with CPFEM. The elongated grain morphology of the AA3103H18 alloy was found to have a small effect on predicted anisotropy. An analysis was made of how many tests are required for proper calibration of the Yld2004-18p orthotropic yield surface. It was found that 32 virtual tests, along either uniformly distributed strain-rate or stress directions but obeying the orthotropic symmetry of the Yld2004-18p yield surface, make a good compromise between accuracy and computation time. Randomly chosen directions have a significantly larger error and require more virtual tests for a similarly good calibration of the yield surface. Since a preselected set of strain-rate directions does not require extra iterations, it is the preferred choice for the calibration of the full-stress-based Yld2004-18p.

Bibliographic Details

Arash Imani Aria; Tomas Mánik; Bjørn Holmedal; Knut Marthinsen

Elsevier BV

Multidisciplinary; Crystal plasticity; yield surface; plasticity; metal anisotropy; microstructure modeling

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