SKM 2021 – scientific programme

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MA: Fachverband Magnetismus

MA 18: Posters Magnetism V

MA 18.10: Poster

Friday, October 1, 2021, 10:00–13:00, P

Analysis of the magnetization profile of 3D printed shape programmable magnetic elastomer actuators — •Kilian Schäfer, Martin Lehmann, Iliya Radulov, and Oliver Gutfleisch — Institute of Materials Science, Technical University Darmstadt, Germany

Magnetically responsive materials can be used as sensors and actuators. The advantages of magnetic actuation mechanisms are fast response, wireless operation and the possibility to operate in enclosed confined spaces. Mechanically soft sensors and actuators are beneficial when compliant and safe interaction with the human body is needed. In addition to that, they can easily adapt to changing environments and can have a simpler design, which potentially results in greater durability and lower cost.

One example of magneto responsive soft materials are composites of polymers and hard magnetic particles, like NdFeB. Recently it was shown that the shape of these composites can be controlled with a magnetic field if the material was magnetized in a specific way beforehand. The material has to be folded in the same way as the desired deformation. Here we realized a programmable magnetic elastomer actuator based on polyurethane and NdFeB particles and present a method to characterize the imprinted magnetization profile in these composites with a custom build 3D Hall Mapper. The device measures all components of the stray field with a spatial resolution of 150 μm. The detailed information will help to improve the design and magnetization strategies of magneto-active composites. Based on this, we evaluate the actuation performance of a 3D printed composite.