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Material stability analysis of particle methods

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Abstract

Material instabilities are precursors to phenomena such as shear bands and fracture. Therefore, numerical methods that are intended for failure simulation need to reproduce the onset of material instabilities with reasonable fidelity. Here the effectiveness of particle discretizations in reproducing of the onset of material instabilities is analyzed in two dimensions. For this purpose, a simplified hyperelastic law and a Blatz–Ko material are used. It is shown that the Eulerian kernels used in smooth particle hydrodynamics severely distort the domain of material stability, so that material instabilities can occur in stress states that should be stable. In particular, for the uniaxial case, material instabilities occur at much lower stresses, which is often called the tensile instability. On the other hand, for Lagrangian kernels, the domain of material stability is reproduced very well. We also show that particle methods without stress points exhibit instabilities due to rank deficiency of the discrete equations.

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Authors and Affiliations

  1. Department of Mechanical and Industrial Engineering and Center for Computer-Aided Design, The University of Iowa, 3131 Seamans Center, Iowa city, IA, 52242, USA

    S. P. Xiao

  2. Department of Mechanical Engineering, Northwestern University, 2145 N Sheridan Rd, Evanston, IL, 60208, USA

    T. Belytschko

Authors
  1. S. P. Xiao
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  2. T. Belytschko
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Correspondence to S. P. Xiao.

Additional information

Communicated by Z. Wu and B.Y.C. Hon

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74S30

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Xiao, S.P., Belytschko, T. Material stability analysis of particle methods. Adv Comput Math 23, 171–190 (2005). https://doi.org/10.1007/s10444-004-1817-5

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  • DOI: https://doi.org/10.1007/s10444-004-1817-5

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