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Theoretical model for fluid-solid coupling in porous materials.

Robert A Guyer1,2, H Alicia Kim3

  • 1Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|May 15, 2015
PubMed
Summary
This summary is machine-generated.

A new theory explains complex behaviors in porous materials by considering solid-fluid, solid-solid, and fluid-fluid interactions. This approach reveals emergent hysteresis caused by fluid-solid coupling, offering insights into material science.

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Area of Science:

  • Materials Science
  • Continuum Mechanics
  • Porous Media Physics

Background:

  • Porous materials exhibit complex behaviors influenced by internal structures and fluid interactions.
  • Existing models often struggle to capture the intricate interplay between solid and fluid phases.
  • Understanding these interactions is crucial for designing advanced materials.

Purpose of the Study:

  • To introduce a unifying theory for describing complex behavior in porous materials.
  • To investigate the role of stored energy in solid-fluid, solid-solid, and fluid-fluid interactions.
  • To analyze the emergence of hysteresis and anisotropy in porous material responses.

Main Methods:

  • A finite element formulation was employed to model porous materials.
  • The model naturally incorporates pore-pore network effects and various pore geometries.
  • Numerical studies were conducted to analyze the mechanical response arising from inter-phase interactions.

Main Results:

  • A strong coupling between fluid and solid phases was identified as the source of complex mechanical responses.
  • Hysteresis and anisotropy were observed as direct consequences of this fluid-solid coupling.
  • The study terms hysteresis arising from fluid-solid coupling as 'emergent hysteresis'.

Conclusions:

  • The proposed unifying theory effectively describes complex behaviors in porous materials.
  • Emergent hysteresis is a key phenomenon driven by fluid-solid coupling in these materials.
  • The finite element approach provides a versatile framework applicable to diverse porous structures.