Dynamic Hysteresis in Cyclic Deformation of Crystalline Solids
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Physical Review Letters, Volume 109, Issue 15
AbstractThe hysteresis or internal friction in the deformation of crystalline solids stressed cyclically is studied from the viewpoint of collective dislocation dynamics. Stress-controlled simulations of a dislocation dynamics model at various loading frequencies and amplitudes are performed to study the stress–strain rate hysteresis. The hysteresis loop areas exhibit a maximum at a characteristic frequency and a power law frequency dependence in the low frequency limit, with the power law exponent exhibiting two regimes, corresponding to the jammed and the yielding or moving phases of the system, respectively. The first of these phases of the system exhibits nontrivial critical-like viscoelastic dynamics, crossing over to intermittent viscoplastic deformation for higher stress amplitudes.
dislocations, hysteresis, deformation, crystalline solids
Laurson, Lasse & Alava, Mikko J. 2012. Dynamic Hysteresis in Cyclic Deformation of Crystalline Solids. Physical Review Letters. Volume 109, Issue 15. 155504/1-5. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.109.155504.