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June 6, 2026Physics of Fluids

A solid-based approach for modeling simple yield-stress fluids: Rheological transitions, overshoot and relaxation

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Authors

JCJehyeok ChoiJKJu Min KimKCKwang Soo Cho

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Overview

This randomized trial demonstrates a new model for understanding yield-stress fluid behavior, indicating novel insights for industrial applications.

Key Points

  • To propose a constitutive equation that accurately describes the rheological behavior of yield-stress fluids.
  • Derived a constitutive equation based on a Zener-type viscoelastic solid and an additional linear dashpot.
  • Utilized a nonlinear viscosity model, flow rule, and an evolution equation for back stress.
  • Conducted startup shear, creep, and stress relaxation tests to validate the model.
  • Successfully predicted stress overshoot during startup shear, demonstrating a homogeneous mechanism of acceleration.
  • Reproduced rheological characteristics consistently with experimental observations.
  • Expanded understanding of flow dynamics in yield-stress fluids.

Cite This Study

Choi et al. (2026) studied this question.

synapsesocial.com/papers/6a23bc5171a5da9775e77b2fhttps://doi.org/10.1063/5.0335782
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