SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 28: Bulk Materials: Soft and Hard Permanent Magnets
MA 28.1: Vortrag
Mittwoch, 29. März 2023, 09:30–09:45, POT 6
Local stiffness tailoring of magneto-active composites produced by laser powder bed fusion — •Kilian Schäfer1, Matthias Lutzi1, Muhammad Bilal Khan1, Sebastian Bruns2, Claas Hartmann3, and Oliver Gutfleisch1 — 1Functional Materials, Institute of Materials Science, TU Darmstadt, — 2Physical Metallurgy, Institute of Materials Science, TU Darmstadt, — 3Measurement and Sensor Technology Group, TU Darmstadt,
Magnetic actuation of mechanically soft actuators allows fast response, wireless operation and safe interaction with the human body. With additive manufacturing, the production of magneto-active composites in complex and bioinspired shapes is possible. To mimic the properties of biological systems, the fabrication of composites with locally different mechanical properties is needed. Here, we present a method to locally tailor the stiffness of a magneto-active compound, consisting of hard magnetic Nd2Fe14B particles in a thermoplastic polyurethane (TPU) matrix with laser powder bed fusion. By utilizing different laser parameters at different locations during the process, the mechanical properties of the composite are modified locally. The range in which the mechanical properties can be tailored is investigated with compression and tensile tests of the composite produced with different laser parameters. The stiffness can be increased tenfold when the laser power is increased from low to high values. The stiffness gradient within one sample is verified by line scans of Vickers indentations with a nanoindentation system. Then the actuation performance is evaluated for samples with and without stiffness gradients.