ar X iv : c on d - m at / 9 80 10 57 v 1 7 J an 1 99 8 Stick - slip Transition in the Scalar Arching Model
نویسندگان
چکیده
When some granular material contained into a silo is pushed upwards with a piston, an irregular stick-slip motion of the system of grains is observed. We show how one can adapt the 'Scalar Arching Model' (sam) – proposed as a model for giant stress fluctuations in silos – in order to describe this stick-slip phenomenon. As a function of the sensitivity of the system to mechanical noise, the system exhibit two different phases: a 'jammed' phase, and a 'sliding' phase where irregular stick-slip is observed. We analyze the transition, which is found to be of mean-field type, and study the statistical properties of the intermittent stick-slip motion.
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