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Dynamics of elastoviscoplastic filament stretching
P Moschopoulos1, E Kouni1, K Psaraki1
1Laboratory of Fluid Mechanics and Rheology, Department of Chemical Engineering, University of Patras, Greece. tsamo@chemeng.upatras.gr.
Soft Matter
|June 14, 2023
Summary
This study theoretically predicts an elongated neck in yield stress materials during stretching, a phenomenon previously unobserved in simulations. Elasticity
Area of Science:
- Rheology and Material Science
- Fluid Dynamics
- Continuum Mechanics
Background:
- Yield stress materials exhibit both elastic and viscoplastic behaviors.
- Filament stretching experiments with these materials show neck formation, but theoretical models have struggled to replicate this.
- Previous simulations often excluded elasticity, potentially missing key dynamic behaviors.
Purpose of the Study:
- To theoretically investigate the stretching dynamics of yield stress materials including elastic and viscoplastic properties.
- To explain the formation of an elongated neck observed in filament stretching experiments.
- To analyze the influence of elasticity on the necking and breakup dynamics.
Main Methods:
- Theoretical modeling of filament stretching between two coaxial disks.
- Utilizing the Saramito-Herschel-Bulkley constitutive model.
- Applying the von Mises yield criterion for material yielding.
Main Results:
- Predicted the formation of an elongated, thin neck when elasticity dominates, connecting the filament bridge.
- Demonstrated that elasticity inclusion is crucial for predicting neck formation, unlike prior studies.
- Showed that increased elasticity reduces pinching time and filament length due to unyielded regions deforming minimally.
Conclusions:
- Elasticity plays a critical role in the filament stretching dynamics of yield stress materials, enabling neck prediction.
- The yield strain value should be interpreted cautiously when assessing the impact of elastic effects on filament stretching.
- This theoretical framework provides new insights into the breakup mechanisms of complex fluids.
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