Abstract
We present an experimental and theoretical study of the fragmentation of
polymeric materials by impacting polypropylene particles of spherical
shape against a hard wall. Experiments reveal a power law mass
distribution of fragments with an exponent close to 1.2, which is
significantly different from the known exponents of three-dimensional
bulk materials. A 3D discrete element model is introduced which
reproduces both the large permanent deformation of the polymer during
impact and the novel value of the mass distribution exponent. We
demonstrate that the dominance of shear in the crack formation and the
plastic response of the material are the key features which give rise to
the emergence of the novel universality class of fragmentation
phenomena.
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