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Experimental and Analytical Framework for Predicting Nonlinear Viscoelastic-Viscoplastic Behavior of Polymers
Alen Oseli1, Matic Šobak1, Lidija Slemenik Perše1
1Laboratory of Experimental Mechanics, Faculty for Mechanical Engineering, University of Ljubljana, Aškerčeva ulica 6, 1000 Ljubljana, Slovenia.
Polymers
|December 11, 2025
Summary
This study introduces an advanced polymer model that accurately predicts viscoelastic-viscoplastic behavior, capturing material flow and irrecoverable processes for enhanced material response analysis.
Area of Science:
- Polymer Science
- Materials Science
- Rheology
Background:
- Schapery's nonlinear viscoelastic model is a foundation for polymer behavior analysis.
- Understanding combined viscoelastic and viscoplastic responses is crucial for polymer applications.
- Existing models may not fully capture irreversible deformation processes in polymers.
Purpose of the Study:
- To expand Schapery's model to incorporate viscoplasticity and material flow.
- To develop a framework for parameter identification and multi-scale analysis.
- To accurately predict polymer behavior under various loading conditions.
Main Methods:
- Theoretical expansion of Schapery's nonlinear viscoelastic model.
- Incorporation of structure- and load-related irrecoverable processes.
- Multi-scale analysis for evaluating viscoelastic and viscoplastic contributions.
- Creep recovery tests on amorphous ABS and semi-crystalline POM.
Main Results:
- The expanded model accurately predicts polymer behavior with less than 5% error.
- Exceptional agreement was observed between model predictions and experimental data.
- Viscoplastic strains were detected even within the linear viscoelastic domain.
Conclusions:
- The developed model effectively captures realistic polymer responses, including non-recoverable strains.
- The model provides insights into material flow and viscoplasticity, distinct from yield phenomena.
- This predictive tool is adaptable for various polymer systems and applications.
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