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Towards the Development of a Strategy to Characterize and Model the Rheological Behavior of Filled, Uncured Rubber
M M A Spanjaards1,2, G W M Peters1, M A Hulsen1
1Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
Polymers
|December 10, 2021
Summary
This study presents a straightforward method to analyze the rheological properties of uncured rubber compounds using oscillatory shear tests and a thixotropy model. The findings aid in simulating complex rubber processing behaviors.
Area of Science:
- Materials Science
- Rheology
- Polymer Engineering
Background:
- Characterizing the rheological behavior of filled, uncured rubber compounds is crucial for understanding and simulating processing.
- Existing methods may not adequately capture the complex, deformation history-dependent nature of these materials.
Purpose of the Study:
- To present an experimental strategy for characterizing the rheological behavior of filled, uncured rubber compounds.
- To develop a simplified phenomenological thixotropy model for describing steady shear behavior.
- To enable the simulation of realistic rubber processing using finite element analysis.
Main Methods:
- Combined oscillatory shear experiments on a plate-plate rheometer with a phenomenological thixotropy model.
- Compared rate- and stress-controlled kinetic equations for a structure parameter.
- Focused on simple models and straightforward characterization for broad applicability.
Main Results:
- Obtained model parameters describing the steady shear behavior of rubber compounds.
- Characterized the dynamic thixotropic behavior influenced by deformation history.
- Developed a foundation for extending rheological characterization to wider shear rate ranges relevant to processing.
Conclusions:
- The presented experimental strategy and thixotropy model offer a practical approach to rheological characterization of uncured rubber.
- The model's simplicity and straightforwardness enhance its applicability in simulating rubber processing.
- Future work will focus on implementing this model in a finite element framework and extending shear rate ranges.
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