Crackling Noise in Plasticity

Is the yield stress a critical point?

“Intermittent dislocation flow in viscoplastic deformation”, Miguel, Vespignani, Zapperi, Weiss, and Grasso,

Nature 410, 667 (2001).

• Put ice crystal under constant shear

• Attach microphone

• Collect statistics on crackle sizes

Power laws! Scaling! Seven decades!

(Karin Dahmen’s lectures…)

Simulation: 2D dislocations?

(Connie Chang…)

sY

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