Svenja HERMANN : "Investigations on magnetically hard and mechanically stiff magnetoactive elastomers – From local interactions towards the development of functional structures

Abstract : This doctoral work focuses on a magnetically hard and mechanically stiff magnetoactive elastomer (stH-MAE) composite material. Experimental studies are presented concerning the manufacturing of the composite as well as the characterization of its mechanical, magnetic and coupling properties. A multiscale model is developed using a continuum approach at the microstructural scale with classic homogenization techniques on statistically homogeneous composites. The effective properties are determined with numerical simulations and the behavior law around the operating point of the material is modeled with a piezomagnetic approach. Two proofs of concept are presented using stH-MAE composites for membrane actuators and passive vibration damping. Both concepts are based on the magnetically induced forces resulting from the remnant magnetization and provide promising results for future applications of stH-MAE in mechatronic devices.

Jury Composition :

Kostas Danas       CNRS, LMS,               Reporter
Laurent Daniel     Centrale Supelec,   Reporter
Markus Kästner   TU Dresden,             Reviewer
Afef Lebouc           CNRS, G2Elab,         Reviewer
Olivier Thomas     ENSAM,                    Reviewer

in presence of the invited participants

Laurent Hirsinger       CNRS, FEMTO-ST
Christophe Espanet   MMT
Maxime Savary           MMT
Valentin Préault          MMT

The presentation will be held in English. Although the presentation of the work will be public, the current sanitary restrictions limit the number of people allowed in the amphitheatre to 40. A livestream will be provided at the following link: https://live.femto-st.fr

Localization : Amphitheater J.J. Gagnepain (15B Avenue des Montboucons)