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Modeling ice block failure within drift ice and ice rubble.

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Summary
This summary is machine-generated.

Modeling sea ice fragmentation requires adjusting particle size and structure in the HiDEM model. Shear failure, not local crushing, is the dominant failure mode in fragmenting ice under compression.

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Area of Science:

  • Material Science
  • Geophysics
  • Computational Mechanics

Background:

  • Modeling force transmission in fragmenting materials, especially sea ice, presents significant challenges.
  • Sea ice exhibits anisotropic and quasibrittle behavior at smaller scales, complicating material modeling.
  • Existing particle-based models often use simplified assumptions unsuitable for detailed ice mechanics.

Purpose of the Study:

  • To develop a refined material model for fragmenting ice using the HiDEM (Highly-adaptive Dissipative Particle Dynamics) model.
  • To improve the accuracy of simulating force transmission and fragmentation processes in saline ice.
  • To validate the enhanced HiDEM model against laboratory-scale experimental data.

Main Methods:

  • Utilized the particle-based HiDEM model, adapting glacier-scale parameters to laboratory-scale grain sizes (meters to millimeters).
  • Replaced the standard HiDEM lattice structure with a planar random structure exhibiting anisotropy.
  • Modified the failure criterion from instant tensile/bending to cohesive softening for enhanced energy dissipation.

Main Results:

  • Achieved compatibility between HiDEM simulations and laboratory experiments on saline ice regarding force transmission and fragmentation.
  • Demonstrated that traditional ice modeling schemes, particularly those assuming local crushing, are incomplete.
  • Identified shear failure, consistent with Mohr-Coulomb theory, as the dominant failure mechanism in fragmenting ice under compression.

Conclusions:

  • The study successfully adapted the HiDEM model for accurate simulation of sea ice fragmentation.
  • Local crushing is an insufficient failure mode for modeling fragmented ice under compression.
  • Shear failure is the primary mechanism governing the behavior of fragmenting ice, necessitating models that incorporate this phenomenon.