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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 16: Modeling and Simulation of Soft Matter II

CPP 16.5: Talk

Tuesday, March 19, 2024, 10:30–10:45, H 0106

Physical model for magneto-mechanical behavior of magneto-active cylinders — •Mehran Roghani¹, Dirk Romeis¹, Gašper Glavan², Inna A. Belyaeva², Mikhail Shamonin², and Marina Saphiannikova¹ — ¹Institute Theory of Polymers, Leibniz-Institut für Polymerforschung Dresden e. V., Dresden, Germany — ²East Bavarian Centre for Intelligent Materials (EBACIM), Ostbayerische Technische Hochschule (OTH) Regensburg, Regensburg, Germany

Magneto-Active Elastomers (MAEs) are adaptive composites made of a soft elastomeric matrix with embedded magnetizable micro-particles. Magnetic interactions among the particles enable remote deformation and active modifications of mechanical properties under external magnetic field. This study presents a physically-based model for cylindrical MAE samples that unifies two scales. We use dipolar mean field approach for taking into account the magnetic interactions at micro- and macro-scale. A penalty term is added to the elastic energy due to particle restructuring within the elastomeric matrix. The restructuring causes initially isotropic material to become more and more anisotropic as the magnetic field increases. This transition is taken into account with a transversely isotropic Neo-Hookean material model. The resulting model enables us to explore how microstructure evolution influences the mechanical and magnetic behavior of MAE samples. The model predictions are verified against experiments conducted with different particle volume fractions. The study emphasizes the crucial role of microstructure evolution in modeling MAE deformation, magnetization, and stiffness.

Keywords: magneto-active elastomer; microstructure evolution; physical modeling; effective magnetization; constitutive modeling