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Fragmentation as an aggregation process: the role of defects.

A Vledouts1, N Vandenberghe1, E Villermaux2

  • 1Aix Marseille Université, CNRS, Centrale Marseille , IRPHE UMR 7342, Marseille 13384, France.

Proceedings. Mathematical, Physical, and Engineering Sciences
|March 22, 2016
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Fragmentation occurs via an inverse aggregation cascade. Stronger force disorder and defects in cohesion interrupt this cascade earlier, leading to different fragmentation patterns in cohesive materials.

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Area of Science:

  • Physics
  • Materials Science
  • Soft Matter Physics

Background:

  • Cohesive objects fragment under strong deformation, such as during impacts.
  • Previous work demonstrated fragmentation via an inverse aggregation cascade in magnetized spheres.

Purpose of the Study:

  • To investigate fragmentation dynamics in a 1D cohesive material with modified force laws.
  • To explore the influence of defects and force distribution on fragmentation.
  • To understand the role of capillary bridges in cohesive fragmentation.

Main Methods:

  • Utilizing hydrogel beads linked by capillary bridges to model cohesive interactions.
  • Inducing sudden expansion to observe fragmentation.
  • Analyzing the cascade of aggregations and its interruption points.

Main Results:

  • Fragmentation still occurs through a cascade of aggregations.
  • Increased force disorder and defects in cohesion lead to earlier interruption of the aggregation cascade.
  • The nature of the force law between beads influences fragmentation patterns.

Conclusions:

  • The fragmentation of 1D cohesive materials is sensitive to the details of inter-particle forces and defects.
  • Force disorder plays a critical role in modifying fragmentation dynamics.
  • This study provides insights into the failure mechanisms of cohesive structures.