The main goal of subproject TP-3 within Research Unit 5250 is the holistic characterization of the microscopic and mechanical deformation and damage behavior under cyclic and corrosive loading of PBF-LB/M-manufactured and coated lattice structures made from the alloy systems Ti-6Al-4V and WE43. Due to the complexity of this scenario, the loading types are initially considered separately and subsequently in superposition, in order to capture the respective dominant mechanisms. Once the influence of the PBF-LB process parameters has been determined through time-efficient corrosion and quasi-static mechanical investigations, an optimal parameter set is defined and used to manufacture simplified 2D geometries based on TPMS (triply periodic minimal surface) structures. Based on the fatigue strength and fatigue damage mechanisms in air, a preferred 2D lattice type is selected for the further characterization of the coating with regard to cyclic load-bearing capacity and corrosion properties. The aim is to build a comprehensive understanding of the mechanical and corrosive properties for the simplified 2D case and to transfer these findings to more complex, application-relevant 3D lattice specimens. To characterize the application-relevant damage behavior, in vitro corrosion fatigue tests are then carried out on 3D lattice structures for WE43, and the mechanical behavior of the interface is characterized on explanted implant-bone connections (ex vivo), along with quantification of the stiffness difference (stress shielding).

Duration: 2022 - 2026 and 2026 - 2030

Consortium: 8 Research Institutes