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Abrupt transition from viscoelastic solidlike to liquidlike behavior in jammed materials
1Cemagref, Domaine des Palaquins, Montoldre, France.
Physical Review Letters
|September 28, 2004
Summary
Pasty materials like foams and gels transition from solid-like to liquid-like behavior when subjected to critical shear stress. This abrupt change in rheological properties is observed using advanced rheometrical techniques.
Area of Science:
- Materials Science
- Rheology
- Polymer Physics
Background:
- Pasty materials exhibit complex flow behaviors.
- Understanding the transition from solid-like to liquid-like states is crucial for material processing and application.
Purpose of the Study:
- To investigate the flow behavior of pasty materials under shear.
- To identify critical conditions leading to a phase transition in material behavior.
Main Methods:
- Utilized a novel rheometrical technique.
- Measured both steady-state velocity fields and initial strain fields.
- Applied controlled shear rates to foam and polymeric gel samples.
Main Results:
- Observed an abrupt transition in material behavior beyond a critical deformation.
- Identified a critical shear rate for this transition.
- Demonstrated a shift from viscoelastic solid-like to steady liquid-like behavior.
Conclusions:
- Pasty materials undergo a distinct solid-to-liquid transition under specific shear conditions.
- The new rheometrical technique effectively captures these transitional phenomena.
- Findings provide insights into the fundamental rheology of complex fluids.