WEB Modeling of strongly coupled magneto-mechanical behavior in magneto-sensitive elastomersWednesday (23.09.2020) 15:40 - 15:55 M: Modelling and Simulation 2 Part of:
Magneto-active elastomers (MAEs) represent a class of active composite materials which typically consist of micron-sized magnetizable particles that are embedded in a soft, elastic polymer network. Due to mutual interactions of the particles, MAEs are able to alter their effective material behavior reversibly if subjected to an external magnetic field. This strong two-way coupling of magnetic and mechanical fields facilitates a variety of applications in the fields of actuators and sensors, tunable valves and vibration absorbers, medical robots as well as prosthetic and orthotic devices with controllable stiffness.
In order to optimize MAEs for specific applications, their material behavior has to be understood properly. Present theories regarding the modeling of these materials range from numerically efficient particle-interaction models over highly-resolving, microscopic continuum approaches to macroscopic models in which the composite material is considered as a homogeneous medium and effects of the underlying microstructure are captured implicitly via magneto-mechanical coupling terms. A combination of these modeling strategies seems to be promising to account for the hierarchical material structure of MAEs: a macroscopic model can be used for an efficient analysis of realistic samples with arbitrary shapes; to capture the material behavior in “hot-spot” regions with a pronounced microstructural evolution, a more resolving microscopic modeling strategy has to be incorporated.
Within this contribution, the idea of such a combined modeling strategy is pursued. In a first step, a microscale continuum approach is validated regarding its capability to predict the behavior of simplified MAE samples. Subsequently, this approach is applied to develop a macroscopic model using finite-element simulations for representative volume elements that account for the complex microstructure of MAEs. In an additional comparison of the microscale model and a dipole approach, an excellent agreement of both strategies is found. It motivates the incorporation of the dipole approach for an efficient modeling of the microstructural evolution in “hot-spot” regions of MAEs.
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