Dynamic hysteresis in cyclic deformation of crystalline solids

Abstract

The 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/moving phases of the system, respectively. The first of these phases exhibits non-trivial critical-like viscoelastic dynamics, crossing over to intermittent viscoplastic deformation for higher stress amplitudes.

5 pages, 4 figures, to appear in Physical Review Letters

References in corpus (6)

• Fluctuations and scaling in creep deformation
• A minimal integer automaton behind crystal plasticity
• Criticality of relaxation in dislocation systems
• Yielding and irreversible deformation below the microscale: Surface effects and non-mean-field plastic avalanches
• Spatial fluctuations in transient creep deformation
• Mean field theory for driven domain walls in disordered environments

Cited by in corpus (8)

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• Avalanches and Plastic Flow in Crystal Plasticity: An Overview
• Global Memory from Local Hysteresis in an Amorphous Solid
• Quenched pinning and collective dislocation dynamics
• Probing microplasticity in small scale FCC crystals via Dynamic Mechanical Analysis
• Plastic strain is a mixture of avalanches and quasi-reversible deformations: Study of various sizes
• Nonsteady dynamic properties of a domain wall for the creep state under an alternating driving field
• Avalanche correlations and stress-strain curves in discrete dislocation plasticity