Steady-State Cracks in Viscoelastic Lattice Models

Details Steady-State Cracks in Viscoelastic Lattice Models Steady-State Cracks in Viscoelastic Lattice Models

1998-12-10

arxiv.org/abs/cond-mat/9812164v1

Physics

Condensed Matter

Soft Condensed Matter

27 pages, 8 figures

Scientific paper

10.1103/PhysRevE.59.5154

We study the steady-state motion of mode III cracks propagating on a lattice exhibiting viscoelastic dynamics. The introduction of a Kelvin viscosity $\eta$ allows for a direct comparison between lattice results and continuum treatments. Utilizing both numerical and analytical (Wiener-Hopf) techniques, we explore this comparison as a function of the driving displacement $\Delta$ and the number of transverse sites $N$. At any $N$, the continuum theory misses the lattice-trapping phenomenon; this is well-known, but the introduction of $\eta$ introduces some new twists. More importantly, for large $N$ even at large $\Delta$, the standard two-dimensional elastodynamics approach completely misses the $\eta$-dependent velocity selection, as this selection disappears completely in the leading order naive continuum limit of the lattice problem.

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