Crack growth by surface diffusion in viscoelastic media.
We discuss steady state crack growth in the spirit of a free boundary problem. It turns out that mode I and mode III situations are very different from each other: In particular, mode III exhibits a pronounced transition towards unstable crack growth at higher driving forces, and the behavior close to the Griffith point is determined entirely through crack surface dissipation, whereas in mode I the fracture energy is renormalized due to a remaining finite viscous dissipation. Intermediate mixed-mode scenarios allow steady state crack growth with higher velocities than for pure mode I.
Spatschek
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Institut für Festkörperforschung, Forschungszentrum Jülich, D-52425 Jülich, Germany.
Brener
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Pilipenko
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