NDLI: Fracture of a model cohesive granular material

Content Provider	Royal Society of Chemistry (RSC)
Author	Schmeink, Alexander Goehring, Lucas Hemmerle, Arnaud
Copyright Year	2017
Abstract	We study experimentally the fracture mechanisms of a model cohesive granular medium consisting of glass beads held together by solidified polymer bridges. The elastic response of this material can be controlled by changing the cross-linking of the polymer phase, for example. Here we show that its fracture toughness can be tuned over an order of magnitude by adjusting the stiffness and size of the polymer bridges. We extract a well-defined fracture energy from fracture testing under a range of material preparations. This energy is found to scale linearly with the cross-sectional area of the bridges. Finally, X-ray microcomputed tomography shows that crack propagation is driven by adhesive failure of about one polymer bridge per bead located at the interface, along with microcracks in the vicinity of the failure plane. Our findings provide insight into the fracture mechanisms of this model material, and the mechanical properties of disordered cohesive granular media in general.
Starting Page	1040
Ending Page	1047
Page Count	8
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	13
Issue Number	5
Journal	Soft Matter
DOI	10.1039/c6sm02600a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Young's modulus Polymer X-ray Fracture toughness Tire
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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Fracture of a model cohesive granular material