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Faculty of Mechanical Engineering
FOR5250 TP-3: TPMS lattice structures for implants

Mechanism-based characterization of the fatigue and corrosion fatigue properties of additively manufactured TPMS lattice structures under physiological conditions

The overall objective of the subproject TP-3 within the research unit 5250 is the holistic characterization   of the microscopic and mechanical deformation and damage behavior  under cyclic loading as well as corrosive exposure of coated Ti-6Al-4V  lattice structures manufactured by means of PBF-LB/M. Due to the   complex scenario, the loading conditions will be first regarded   separately and later on collectively in order to detect the dominant   mechanisms, respectively. After determining the influence of the PBF-  LB/M process parameters through performing time-efficient corrosion   and quasi-static tests, an optimal parameter set is defined which is   used for manufacturing of simplified 2D geometries based on triply   periodic minimal surfaces (TPMS). Resulting from the fatigue strength  and the cyclic damage mechanisms in air, a favored 2D lattice type   will be selected for further characterization of the coating with regard   to the load capacity and the corrosive properties. The aim is to   establish an extensive understanding of the mechanical and corrosive  properties for the simplified 2D geometry which will then be   transferred towards 3D lattice structures. To characterize the   application-oriented damage behavior, in-vitro corrosion fatigue tests   for 3D lattice structures will be conducted. Further on, the mechanical   behavior of the bone/implant interface (ex vivo) is characterized and   stiffness mismatches (stress shielding) are quantified.

Duration: 2022 - 2026

Consortium: 8 Research Institutes