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From force chains to nonclassical nonlinear dynamics in cemented granular materials.

T J Ulrich1, Zhou Lei2, Marcel C Remillieux2

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Summary
This summary is machine-generated.

This study reveals that force chains in cemented granular materials cause nonlinear dynamics. This mechanism explains the reversible decrease in elastic properties and unique wave propagation effects observed in these materials.

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Area of Science:

  • Geophysics
  • Materials Science
  • Solid Mechanics

Background:

  • Cemented granular materials exhibit nonclassical nonlinear dynamics, often classified as mesoscopic nonlinear elastic materials.
  • Understanding the underlying mechanisms is crucial for predicting material behavior under dynamic loading.

Purpose of the Study:

  • To present evidence for a mechanism responsible for the observed nonlinear dynamics in cemented granular materials.
  • To numerically demonstrate the formation and role of force chains in these materials.

Main Methods:

  • Numerical simulations using the hybrid finite-discrete-element method (FEM-DEM).
  • Experimental validation using nonlinear resonant ultrasound spectroscopy (NRUS).

Main Results:

  • Dynamic loading induces force chains within the grain-pore network of cemented granular materials.
  • Interface properties and localized stress at grain contacts cause a reversible decrease in macroscopic elastic properties.
  • Peculiar effects on elastic wave propagation are observed, particularly when grain boundary properties are considered.

Conclusions:

  • Force chain formation is identified as the key mechanism driving nonlinear dynamics in cemented granular materials.
  • The study bridges numerical findings with experimental observations, validating the proposed mechanics.
  • This research provides insights into the mesoscopic nonlinear elastic behavior of granular materials.