Fig. 2: Correlation between the stress drops and the acoustic signals.
From: Dislocation avalanches are like earthquakes on the micron scale
a Distribution of stress drop sizes Δσ for different pillar side lengths d. The probability density functions (PDFs) follow a power-law with exponent τσ = 1.8 ± 0.1. The inset shows the PDF as a function of the force drop ΔF = Δσ ⋅ d2 with units in mN. The collapsed curves can be fitted with a master function above the detection threshold and exhibit a cut-off at F0 = 1.5 ± 0.1 mN. b Distribution of AE energies of individual signals detected at the sample surface. The curves are characterized by a power-law exponent τE = 1.7 ± 0.1 and do not exhibit an apparent cut-off and do not depend on the pillar side length d. c Scatter plot of the injected energies Einj during stress drops of d = 32 μm pillars and the corresponding summed released AE energies E. The color-scale refers to the actual stress at which the stress drop took place along the stress-time curve and do not show correlation with the injected energy. The red dots represent the average released energies Eavg obtained by averaging the datapoints for bins of logarithmically increasing width. The dashed line represents the E ∝ Einj linear relationship.
