Breaking arches with vibrations: the role of defects

Details Breaking arches with vibrations: the role of defects Breaking arches with vibrations: the role of defects

2012-04-03

arxiv.org/abs/1204.0654v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

We present experimental results about the stability of arches against external vibrations. Two dimensional strings of mutually stabilizing grains are geometrically analyzed and subsequently submitted to a periodic forcing at fixed frequency and increasing amplitude. The main factor that determines the granular arch resistance against vibrations is the maximum angle among those formed between any particle of the arch and its two neighbors: the higher the maximum angle is, the easier to break the arch. Based in an analysis of the forces, a simple explanation is given for this dependence. From this, interesting information can be extracted about the expected magnitudes of normal forces and friction coefficients of the particles conforming the arches.

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