LMA - Laboratoire de Mécanique et d’Acoustique

K. Danas - On the modelling for hard and soft magnetorheological elastomers and their instabilities

Amphithéâtre François Canac, LMA

Le 9 mars 2021 de 11h00 à 12h00

Kostas Danas / Laboratoire de Mécanique des Solides, École Polytechnique

Abstract : In this talk, I will present our recent theoretical, numerical and experimental work on magnetorheological elastomers (MREs). MREs are composite materials comprising metallic soft (e.g. iron) or hard (e.g. NdFeB) magnetic micron-sized particles. The latter have been called h-MREs. Out of these materials one can devise a number of interesting meso- and macrostructures slender or not that can lead to a number of functionalities such as surface patterning, negative or positive swelling, network activation, negative Poisson ratio, evolving anisotropic magnetic properties, hierarchical buckling and others. Their modeling is highly demanding since they exhibit finite strains and, in many cases, strong magneto-mechanical coupling. This coupling is a result of the particle-particle interactions. Those interactions evolve during a large strain process and one needs to describe them sufficiently well to recover the actual response of the material. I will present a recent homogenization-guided model for soft MREs which is then implemented in the modeling of an entire magnetic device that serves to deform an MRE membrane. The difficulties in the numerical modeling of both material and device will be highlighted. The final results are versatile and can be used to any type of device of boundary value problem. In particular, these models will then be used to study experimentally and numerically a MRE film/substrate structure and its wrinkling response, which evolves into a novel pattern called crinkling.

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