Amandine Miksic - ISC-CNR Roma #
Acoustic emission characterization in a sheared granular medium #
We realize spring-driven shear tests on a 3-D granular sample and record the acoustic 
emission (AE) from the frictional sliding. The transition from a stick-slip response 
to a liquid-like behavior of the granular sample is observed when we increase the 
applied shear rate. The AE signals are clearly different for the two regimes, but the 
AE intensity seems related to the shear rate in both cases. In addition, the acoustic 
emission presents different signatures for each regime: in the frequency domain, as 
well as in the distribution of AE intensities.